{"dp_type": "Dataset", "free_text": "Cryosphere"}
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| Dataset Title/Abstract/Map | NSF Award(s) | Date Created | PIs / Scientists | Project Links | Abstract | Geometry |
|---|---|---|---|---|---|---|
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2D shear-wave velocity model across the West Antarctic Rift System from POLENET-ANET seismic data
|
1643795 |
2021-01-15 | Mikesell, Dylan |
Colloborative Research: Monitoring Antarctic Ice Sheet Changes with Ambient Seismic Noise Methods |
This data set includes observations of Rayleigh and Love wave group and phase velocity dispersion curves from ambient noise crosscorrelation functions. The data set includes the corresponding shear wave velocity model produced by joint inversion of these dispersion curves. This investigators developed a new crust and upper mantle model directly beneath the seismic stations used in this study. Data are in NetCDF and GeoCSV formats. The Python code used to generate the NetCDF files from the GeoCSV files is also contained in the data set. | ["POLYGON((-134.5 -75,-130.85 -75,-127.2 -75,-123.55 -75,-119.9 -75,-116.25 -75,-112.6 -75,-108.95 -75,-105.3 -75,-101.65 -75,-98 -75,-98 -75.85,-98 -76.7,-98 -77.55,-98 -78.4,-98 -79.25,-98 -80.1,-98 -80.95,-98 -81.8,-98 -82.65,-98 -83.5,-101.65 -83.5,-105.3 -83.5,-108.95 -83.5,-112.6 -83.5,-116.25 -83.5,-119.9 -83.5,-123.55 -83.5,-127.2 -83.5,-130.85 -83.5,-134.5 -83.5,-134.5 -82.65,-134.5 -81.8,-134.5 -80.95,-134.5 -80.1,-134.5 -79.25,-134.5 -78.4,-134.5 -77.55,-134.5 -76.7,-134.5 -75.85,-134.5 -75))"] |
|
NBP1704 CTD sensor data
|
1341606 |
2021-01-12 | Stammerjohn, Sharon |
Collaborative Research: Seasonal Sea Ice Production in the Ross Sea, Antarctica |
Ocean profile data from a SeaBird SBE 911plus CTD package deployed on the NBP1704 PIPERS cruise in the Ross Sea \(Apr 11 to Jun 10, 2017\)\\. | ["POLYGON((-180 -59.9,-179.53 -59.9,-179.06 -59.9,-178.59 -59.9,-178.12 -59.9,-177.65 -59.9,-177.18 -59.9,-176.71 -59.9,-176.24 -59.9,-175.77 -59.9,-175.3 -59.9,-175.3 -61.68,-175.3 -63.46,-175.3 -65.24,-175.3 -67.02,-175.3 -68.8,-175.3 -70.58,-175.3 -72.36,-175.3 -74.14,-175.3 -75.92,-175.3 -77.7,-175.77 -77.7,-176.24 -77.7,-176.71 -77.7,-177.18 -77.7,-177.65 -77.7,-178.12 -77.7,-178.59 -77.7,-179.06 -77.7,-179.53 -77.7,180 -77.7,178.36 -77.7,176.72 -77.7,175.08 -77.7,173.44 -77.7,171.8 -77.7,170.16 -77.7,168.52 -77.7,166.88 -77.7,165.24 -77.7,163.6 -77.7,163.6 -75.92,163.6 -74.14,163.6 -72.36,163.6 -70.58,163.6 -68.8,163.6 -67.02,163.6 -65.24,163.6 -63.46,163.6 -61.68,163.6 -59.9,165.24 -59.9,166.88 -59.9,168.52 -59.9,170.16 -59.9,171.8 -59.9,173.44 -59.9,175.08 -59.9,176.72 -59.9,178.36 -59.9,-180 -59.9))"] |
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Meteoric 10Be data of soils from the Shackleton Glacier region
|
1341736 1341631 |
2021-01-03 | Diaz, Melisa A. |
Collaborative Research: The Role of Glacial History on the Structure and Functioning of Ecological Communities in the Shackleton Glacier Region of the Transantarctic Mountains |
We collected soil surface samples (n = 21) and depth profiles (n = 25) every 5 cm to refusal (up to 30 cm) from eleven ice-free areas along the Shackleton Glacier, a major outlet glacier of the East Antarctic Ice Sheet (EAIS). We measured meteoric 10Be concentrations, which were later used to estimate relative surface exposure ages of the soils from seven locations. | ["POLYGON((-177.4099 -84.4661,-177.08229 -84.4661,-176.75468 -84.4661,-176.42707 -84.4661,-176.09946 -84.4661,-175.77185 -84.4661,-175.44424 -84.4661,-175.11663 -84.4661,-174.78902 -84.4661,-174.46141 -84.4661,-174.1338 -84.4661,-174.1338 -84.56828,-174.1338 -84.67046,-174.1338 -84.77264,-174.1338 -84.87482,-174.1338 -84.977,-174.1338 -85.07918,-174.1338 -85.18136,-174.1338 -85.28354,-174.1338 -85.38572,-174.1338 -85.4879,-174.46141 -85.4879,-174.78902 -85.4879,-175.11663 -85.4879,-175.44424 -85.4879,-175.77185 -85.4879,-176.09946 -85.4879,-176.42707 -85.4879,-176.75468 -85.4879,-177.08229 -85.4879,-177.4099 -85.4879,-177.4099 -85.38572,-177.4099 -85.28354,-177.4099 -85.18136,-177.4099 -85.07918,-177.4099 -84.977,-177.4099 -84.87482,-177.4099 -84.77264,-177.4099 -84.67046,-177.4099 -84.56828,-177.4099 -84.4661))"] |
|
High-resolution nearshore benthic seawater temperature from around McMurdo Sound, Antarctica (2017-2019)
|
1644196 |
2021-01-03 | Cziko, Paul |
Habitat Severity and Internal Ice in Antarctic Notothenioid Fishes |
Nearshore benthic seawater temperature (plus pressure and salinity for some sites) in McMurdo Sound, Antarctica for 2017-2019. Data includes those from standalone temperature (sometimes pressure) for several sites around McMurdo Sound as well as data from the cabled McMurdo Oceanographic Observatory moored conductivity-temperature-depth (CTD) sensor at the McMurdo Station seawater intake jetty. Data are from high precision SeaBird sensors (SBE56, SBE39, SBE19Plus and SBE37), with sample intervals from 90 sec to 15 min, depending on site. Sampled sites include Explorer's Cove at New Harbor, Cape Evans, Granite Harbor, and the McMurdo Station jetty. All sensors were deployed near or on the benthos at 20-25 m deep, in typical nearshore benthic fish and invertebrate habitat. | ["POLYGON((162.647931 -77.000624,163.049652 -77.000624,163.451373 -77.000624,163.853094 -77.000624,164.254815 -77.000624,164.656536 -77.000624,165.058257 -77.000624,165.459978 -77.000624,165.861699 -77.000624,166.26342 -77.000624,166.665141 -77.000624,166.665141 -77.0856883,166.665141 -77.1707526,166.665141 -77.2558169,166.665141 -77.3408812,166.665141 -77.4259455,166.665141 -77.5110098,166.665141 -77.5960741,166.665141 -77.6811384,166.665141 -77.7662027,166.665141 -77.851267,166.26342 -77.851267,165.861699 -77.851267,165.459978 -77.851267,165.058257 -77.851267,164.656536 -77.851267,164.254815 -77.851267,163.853094 -77.851267,163.451373 -77.851267,163.049652 -77.851267,162.647931 -77.851267,162.647931 -77.7662027,162.647931 -77.6811384,162.647931 -77.5960741,162.647931 -77.5110098,162.647931 -77.4259455,162.647931 -77.3408812,162.647931 -77.2558169,162.647931 -77.1707526,162.647931 -77.0856883,162.647931 -77.000624))"] |
|
Shackleton Glacier region water-soluble salt isotopes
|
1341631 1341736 |
2021-01-02 | Diaz, Melisa A.; Lyons, W. Berry; Gardner, Christopher B. |
Collaborative Research: The Role of Glacial History on the Structure and Functioning of Ecological Communities in the Shackleton Glacier Region of the Transantarctic Mountains |
Soil samples were collected from the Shackleton Glacier region, located in the Queen Maud Mountains during the 2017-2018 austral summer. A subset of 27 samples were analyzed for stable isotopes of S, N, C, and O in nitrate, sulfate, and (bi)carbonate. ). δ15N-NO3 values ranged from -47.8 to 20.4‰ and, while all Δ17O-NO3 values are positive, they ranged from 15.7 to 45.9‰. δ34S-SO4 and δ18O-SO4 values ranged from 12.5 and 17.9‰ and -14.5 to -7.1‰, respectively. Total inorganic carbon isotopes ((bi)carbonate) in bulk soil samples ranged from 0.2 to 8.5‰ for δ13C and -38.8 to -9.6‰ for δ18O. | ["POLYGON((-177.3907 -84.46466667,-177.06501 -84.46466667,-176.73932 -84.46466667,-176.41363 -84.46466667,-176.08794 -84.46466667,-175.76225 -84.46466667,-175.43656 -84.46466667,-175.11087 -84.46466667,-174.78518 -84.46466667,-174.45949 -84.46466667,-174.1338 -84.46466667,-174.1338 -84.566988336,-174.1338 -84.669310002,-174.1338 -84.771631668,-174.1338 -84.873953334,-174.1338 -84.976275,-174.1338 -85.078596666,-174.1338 -85.180918332,-174.1338 -85.283239998,-174.1338 -85.385561664,-174.1338 -85.48788333,-174.45949 -85.48788333,-174.78518 -85.48788333,-175.11087 -85.48788333,-175.43656 -85.48788333,-175.76225 -85.48788333,-176.08794 -85.48788333,-176.41363 -85.48788333,-176.73932 -85.48788333,-177.06501 -85.48788333,-177.3907 -85.48788333,-177.3907 -85.385561664,-177.3907 -85.283239998,-177.3907 -85.180918332,-177.3907 -85.078596666,-177.3907 -84.976275,-177.3907 -84.873953334,-177.3907 -84.771631668,-177.3907 -84.669310002,-177.3907 -84.566988336,-177.3907 -84.46466667))"] |
|
Shackleton Glacier region soil water-soluble geochemical data
|
1341736 1341631 |
2021-01-02 | Diaz, Melisa A.; Lyons, W. Berry; Gardner, Christopher B. |
Collaborative Research: The Role of Glacial History on the Structure and Functioning of Ecological Communities in the Shackleton Glacier Region of the Transantarctic Mountains |
During the 2017-2018 austral summer, 220 surface soil samples (~top 5 cm) were collected from 11 distinct ice-free areas (Roberts Massif, Schroeder Hill, Mt. Augustana, Bennett Platform, Mt. Heekin, Thanksgiving Valley, Taylor Nunatak, Mt. Franke, Mt. Wasko, Nilsen Peak, and Mt. Speed) along the Shackleton Glacier. Dried soils were leached at a 1:5 soil to DI water ratio, and the leachate was filtered through 0.4 µm Nucleopore membrane filters. The leachate was analyzed for anions (F-, Cl-, Br-, and SO42-) which were measured on a Dionex ICS-2100 ion chromatograph, cations (K+, Na+, Ca2+, Mg2+, and Sr2+) which were measured on a PerkinElmer Optima 8300 Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES), and nutrients (NO3- + NO2-, PO43-, H4SiO4, and NH3) which were measured on a Skalar San++ Automated Wet Chemistry Analyzer at The Ohio State University. Perchlorate (ClO4-) and chlorate (ClO3-) were measured using an ion chromatograph-tandem mass spectrometry technique (IC-MS/MS) at Texas Tech University. Accuracy was typically better than 5% for all major anions, cations, and nutrients, as determined by the NIST 1643e external reference standard and the 2015 USGS interlaboratory calibration standard (M-216), and better than 10% for perchlorate and chlorate, as determined by spike recoveries. | ["POLYGON((-177.4213 -84.4647,-177.08802 -84.4647,-176.75474 -84.4647,-176.42146 -84.4647,-176.08818 -84.4647,-175.7549 -84.4647,-175.42162 -84.4647,-175.08834 -84.4647,-174.75506 -84.4647,-174.42178 -84.4647,-174.0885 -84.4647,-174.0885 -84.56732,-174.0885 -84.66994,-174.0885 -84.77256,-174.0885 -84.87518,-174.0885 -84.9778,-174.0885 -85.08042,-174.0885 -85.18304,-174.0885 -85.28566,-174.0885 -85.38828,-174.0885 -85.4909,-174.42178 -85.4909,-174.75506 -85.4909,-175.08834 -85.4909,-175.42162 -85.4909,-175.7549 -85.4909,-176.08818 -85.4909,-176.42146 -85.4909,-176.75474 -85.4909,-177.08802 -85.4909,-177.4213 -85.4909,-177.4213 -85.38828,-177.4213 -85.28566,-177.4213 -85.18304,-177.4213 -85.08042,-177.4213 -84.9778,-177.4213 -84.87518,-177.4213 -84.77256,-177.4213 -84.66994,-177.4213 -84.56732,-177.4213 -84.4647))"] |
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Long-term underwater images from around a single mooring site in McMurdo Sound, Antarctica (2017-2019)
|
1644196 |
2020-12-29 | Cziko, Paul |
Habitat Severity and Internal Ice in Antarctic Notothenioid Fishes |
Long-term images taken by the camera from the McMurdo Oceanographic Observatory mooring in McMurdo Sound, Antarctica during its 2-year deployment (2017-2019). The mooring was situated at the seawater terminus of the McMurdo Station seawater intake jetty at 21 m deep, typically under thick sea ice cover. The automated 360° pan-tilt-zoom (ptz) camera, inside of an air-filled self-cleaning dome, was programmed to move to 42 ptz "waypoints" every hour and take a still 1920x1080 JPG image for archiving. Lights, oriented in one direction only, illuminated a rock/rubble slope for much of each winter, when there was no natural illumination. The camera was situated on a concrete block, which elevated the camera about 1m off of the seabed. Motile and sessile benthic biota, including notothenioid fishes, anemones, pycnogonids, asteroids, soft-corals, sponges, and nudibranchs are commonly seen in the images. Some ptz waypoints survey the water column and underside of the sea ice, capturing also the presence of larval/juvenile fishes and other plankton/nekton in the water column. Maximum intervals between subsequent images from the same ptz waypoint were about 1 hour, though many waypoints were captured at somewhat higher frequency. Interval images, taken at 5-min intervals irrespective of camera orientation, were also captured. Images are occasionally obscured/impacted by the camera dome's wiper, darkness, low visibility, minor fouling of the camera dome, and out-of-focus lens elements. | ["POINT(166.6645 -77.851)"] |
|
Long-term broadband underwater acoustic recordings from McMurdo Sound, Antarctica (2017-2019)
|
1644196 |
2020-12-29 | Cziko, Paul |
Habitat Severity and Internal Ice in Antarctic Notothenioid Fishes |
Broadband underwater acoustic recordings from the McMurdo Oceanographic Observatory mooring near the seaward terminus of the McMurdo Station seawater intake jetty. An omnidirectional Ocean Sonics icListen hydrophone (SB2-ETH, SN 1713) recorded continuously at 512 kilosamples/second (256 kHz Nyquist frequency; 24 bit) for 2 years. The hydrophone was mounted vertically on a steel strut (insulated with rubber sheet) at about 70 cm above the mud/gravel seabed at 21m deep, with the sloping 45° rubble face of the jetty just behind the hydrophone. Temporal coverage is >90%, with gaps and truncated files arising due to network and power outages and software bugs. The audio recordings are 10 minute WAV files, compressed using the lossless FLAC code (Free Lossless Audio Codec, xiph.org; about 33MB of data/minute compressed; 100MB/min uncompressed). The hydrophone was under thick (to 3 m) sea ice cover for the majority of the dataset. The majority of the recorded biological sounds were produced by Weddell seals. Orca were present intermittently (~10 days total) in January-March in both summers. Known non-biological sounds include irregular low-intensity, broad-spectrum clicks and cracks from the sea ice cover, occasional wind noise, a 1.5-s gurgle with components to 200kHz every 90s from the CTD’s pump, a broad-spectrum mechanical sound for 3 min every 4 h from the observatory's underwater camera cleaning system, low-intensity whines (about 18, 58, 83, and 130 kHz, though variable over the dataset) thought to be from the station seawater pumps (>100 m away within the jetty’s well casing), and intermittent noises from tracked-vehicles and helicopters (September–February), SCUBA divers (October–December), and ships (January). Given hosting limitations, only every 6th file (roughly 10min/hour) has been archived here. Additional data can be obtained by contacting the primary author of the dataset, who will maintain it for as long as possible. Audio spectrogram images (PNGs) at three frequency ranges (three stacked panels per image, upper limits of 2.5, 25, and 256 kHz) from the entire dataset (all data, not subsampled) are also archived separately. | ["POINT(166.6645 -77.851)"] |
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Mean Ocean Temperature in Marine Isotope Stage 4
|
1246148 1245659 1245821 |
2020-12-28 | Shackleton, Sarah |
Collaborative Research: The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive |
Inert gas measurements on a large diameter (0.24m), shallow (20m) ice core from Taylor Glacier for mean ocean temperature reconstruction from 60 - 74 ka. Four samples were also measured on the WAIS Divide ice core to validate Taylor Glacier reconstruction. | [] |
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Thermal sensitivity of membrane fluidity and integrity in hearts of Antarctic fishes that vary in expression of hemoglobin and myoglobin
|
1341602 1341663 |
2020-12-24 | O'Brien, Kristin; Evans, Elizabeth; Farnoud, Amir; Crockett, Elizabeth |
Collaborative Research: The Physiological and Biochemical Underpinnings of Thermal Tolerance in Antarctic Notothenioid Fishes |
Antarctic notothenioids are noted for extreme stenothermy, yet underpinnings of their thermal limits are not fully understood. We hypothesized that properties of ventricular membranes could explain previously observed differences among notothenioids in temperature onset of cardiac arrhythmias and persistent asystole. Microsomes were prepared using ventricles from six species of notothenioids, including four species from the hemoglobin-less (Hb-) family Channichthyidae (icefishes), which also differentially express cardiac myoglobin (Mb), and two species from the (Hb+) Nototheniidae. We determined membrane fluidity and structural integrity by quantifying fluorescence depolarization of 1,6-diphenyl-1,3,5-hexatriene (DPH) and leakage of 5(6)-carboxyfluorescein, respectively, over a temperature range from ambient (0 °C) to 20 °C. Compositions of membrane phospholipids and cholesterol contents were also quantified. Membranes from all four species of icefishes exhibited greater fluidity than membranes from the red-blooded species N. coriiceps. Thermal sensitivity of fluidity did not vary among species. The greatest thermal sensitivity to leakage occurred between 0 and 5 °C for all species, while membranes from the icefish, Chaenocephalus aceratus (Hb-/Mb-) displayed leakage that was nearly 1.5-fold greater than leakage in N. coriiceps (Hb+/Mb+). Contents of phosphatidylethanolamine (PE) were approximately 1.5-fold greater in icefishes than in red-blooded fishes, and phospholipids had a higher degree of unsaturation in icefishes than in Hb + notothenioids. Cholesterol contents were lowest in Champsocephalus gunnari (Hb-/Mb-) and highest in the two Hb+/Mb + species, G. gibberifrons and N. coriiceps. Our results reveal marked differences in membrane properties and indicate a breach in membrane fluidity and structural integrity at a lower temperature in icefishes than in red-blooded notothenioids. | [] |
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Red and Green Snow Algae Surface Spectra
|
None | 2020-12-21 | Khan, Alia | No project link provided | Surface spectra of red and green snow algae were collected at two sites on King George Island (KGI), the largest of the South Shetland Islands, and one site on northern Nelson Island (NI), southwest of KGI in January 2018. Optically thick (> 30cm) snow packs were prioritized for spectral albedo data acquisition and corresponding snow algae sampling in order to minimize the impact of the underlying ground on spectral albedo. Sites were also selected based on where it was possible to sample 1) a control site with relatively clean snow having no visible snow algae 2) green snow algae, 3) red snow algae and 4) mixed-phase green and red algae. At each site, duplicates of each snow type were measured with the spectrometer (except at Nelson Island where only one Mixed site was observed). All samples were collected around noon local Chilean time, when the seasonal snow pack was also receiving the most incoming solar radiation. Spectral reflectance measurements were collected with an Analytical Spectral Devices (ASD) FieldSpec® 4 hyperspectral spectroradiometer (Malvern Panalytical, USA) between 350 and 2500 nm. The sensor was equipped with a light-diffusing fore optic remote cosine receptor (RCR) to measure planar irradiance. We selected three different locations and collected spectral measurements for two samples each of green, red, and mixed snow algae patches, and two algae-free or “clean” snow areas, for a total of 24 measurement sites (2 of each of the 4 types across the 3 sites). Areas with snowmelt ponding were avoided. The RCR was placed upward to collect the downwelling planar irradiance incident upon the snow surface (Ed) and the upwelling planar irradiance reflected from the snow (Eu). Measurements were collected in triplicate. The operator was located in a direction 90 - 135º away from the sun to minimize solar glint and self-shadowing. Snow conditions did not allow for a tripod, so nadir orientation was determined by practice with a level and by visual assistance of an observer. Since the measurements were carried out under heavily overcast conditions where irradiance is dominated by the diffuse insolation with no solar azimuthal dependence, the influence of slight tilt when measuring the downwelling irradiance (i.e. the cosine error) is expected to be minor (<0.5%). The reflectance measurements were taken prior to excavation of snow sample for laboratory analysis. Post-processing of the data involved computing spectral reflectance, as the ratio of the upwelling flux normalized to the downwelling flux for each wavelength. The mean of the three measurements was calculated for each site. Ambient light conditions were too low in the short-wave infrared wavelengths for getting adequate signal-to-noise for our measurements. In post-processing, reflectance values were truncated at 1350 nm for this analysis. This value represents the limit often used for RF calculations in other studies. In addition, empirical correction coefficients were used to correct for temperature related radiometric inter-channel steps using the procedure and MATLAB code from Hueni et al. (2017). This removed the step function near 1000 nm for most of the spectra, although not fully for all spectra. However, this discontinuity does not significantly impact results or albedo calculations. Albedo was calculated as the integrated R in two different intervals: visible (400-700 nm) and infrared (700-1300 nm). | ["POINT(-58 -62)"] |
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Effects of acute warming on cardiovascular performance of Antarctic fishes
|
1341602 1341663 |
2020-12-18 | Joyce, William; Farrell, Anthony; Axelsson, Michael; Egginton, Stuart; Crockett, Elizabeth; O'Brien, Kristin |
Collaborative Research: The Physiological and Biochemical Underpinnings of Thermal Tolerance in Antarctic Notothenioid Fishes |
We tested the hypothesis that blackfin icefish (Chaenocephalus aceratus), one of the six species in the family Channichthyidae (the icefishes) that do not express haemoglobin and myoglobin, lack regulatory cardiovascular flexibility during acute warming and activity. The experimental protocols were designed to optimize the surgical protocol and minimize stress. First, minimally invasive heart rate (fH) measurements were made during a thermal ramp until cardiac failure in C. aceratus and compared with those from the closely related red-blooded black rockcod (Notothenia coriiceps). Then, integrative cardiovascular adjustments were more extensively studied using flow probes and intravascular catheters in C. aceratus during acute warming (from 0 to 8°C) at rest and after imposed activity. Chaenocephalus aceratus had a lower routine fH than N. coriiceps (9 beats min-1 versus 14 beats min-1) and a lower peak fH during acute warming (38 beats min-1 versus 55 beats min-1) with a similar cardiac breakpoint temperature (13 and 14°C, respectively). Routine cardiac output (Q̇) for C. aceratus at ∼0°C was much lower (26.6 ml min-1 kg-1) than previously reported, probably because fish in the present study had a low fH (12 beats min-1) indicative of a high routine vagal tone and low stress. Chaenocephalus aceratus increased oxygen consumption during acute warming and with activity. Correspondingly, Q̇ increased considerably (maximally 86.3 ml min-1 kg-1), as did vascular conductance (5-fold). Thus, unlike earlier suggestions, these data provide convincing evidence that icefish can mount a well-developed cardiovascular regulation of heart rate, cardiac output and vascular conductance, and this regulatory capacity provides flexibility during acute warming. | [] |
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Ice-penetrating radar internal stratigraphy over Dome C and the wider East Antarctic Plateau
|
0424589 0733025 0941678 1443690 |
2020-12-18 | Cavitte, Marie G. P; Young, Duncan A.; Mulvaney, Robert; Ritz, Catherine; Greenbaum, Jamin; Ng, Gregory; Kempf, Scott D.; Quartini, Enrica; Muldoon, Gail R.; Paden, John; Frezzotti, Massimo; Roberts, Jason; Tozer, Carly; Schroeder, Dustin; Blankenship, Donald D. |
Center for Remote Sensing of Ice Sheets (CReSIS) IPY Research: Investigating the Cryospheric Evolution of the Central Antarctic Plate (ICECAP) Collaborative Research: Southern Plateau Ice-sheet Characterization and Evolution of the Central Antarctic Plate (SPICECAP) |
The data set published here consists of 26 ice-penetrating radar IRHs (internal reflecting horizons) which were traced across multiple ice-penetrating radar surveys that deployed several generations of modern ice-penetrating radar sounders over a decade, between 2008 and 2018, over the Dome C region of the East Antarctic Plateau. The data set is associated to ESSD publication: Cavitte et al., ESSD <to be completed after publication>. We can subdivide the radar sounders used into three sets. The primary set was collected by the University of Texas at Austin Institute for Geophysics (UTIG) and the Australian Antarctic Division (AAD) as part of the ICECAP project) between 2008 and 2015. This includes the Oldest Ice candidate A (OIA) survey flown by ICECAP in January 2016. Data were collected with the High Capacity Airborne Radar Sounder (HiCARS) 1 & 2 and its Multifrequency Airborne Radar-sounder for Full-phase Assessment (MARFA) descendant. The data was collected from a DC-3T Basler which operated from Concordia Station. The second set consists of the Vostok-Dome C airborne radar transect was flown by the Center for Remote Sensing of Ice Sheets (CReSIS) at the University of Kansas using the Multi-Channel Coherent Radar Depth Sounder (MCoRDS) in a single flight line in 2013. A P-3 Orion operating from McMurdo Station collected these data as part of NASA Operation Ice Bridge. The third set consists of a subset of the LDC ground-based radar survey, towed behind a PistenBully PB300 tractor, collected by the Beyond EPICA - Oldest Ice (BE-OI) European Consortium using the British Antarctic Survey’s (BAS) Deep Looking Radio Echo Sounder (DELORES) radar system. Each IRH has been traced in all three radar sets and is published here as a single csv and netcdf file. Formats are self-documented in these csv/netcdf files. Where HiCARS and MCoRDS radar transects are used, the IRH is provided at a 1 km spatial resolution, where DELORES radar transects are used, the IRH is provided at a 250 m spatial resolution. The 26 IRHs published here were traced semi-automatically by first author Marie Cavitte, using Landmark's Decision Space Desktop software and its built-in picker. The IRHs are dated at the EDC ice core using the AICC2012 timescale (Veres et al., 2013; Bazin et al., 2013) Ice core ages are transferred onto the IRHs on radar transect MCM/JKB1a/EDMC01a at distance = 110.153 m along the transect. Depth and age uncertainties associated to each IRH are quantified in the associated ESSD publication: Cavitte et al., ESSD <to be completed after publication>. Besides NSF this dataset is the result of additional support from NERC grant - NE/D003733/1, NASA grants - NNX08AN68G, NNX09AR52G, NNX11AD33G, NNX13AD53A, and funding from the G. Unger Vetlesen Foundation. | ["POLYGON((114 -74,115.2 -74,116.4 -74,117.6 -74,118.8 -74,120 -74,121.2 -74,122.4 -74,123.6 -74,124.8 -74,126 -74,126 -74.3,126 -74.6,126 -74.9,126 -75.2,126 -75.5,126 -75.8,126 -76.1,126 -76.4,126 -76.7,126 -77,124.8 -77,123.6 -77,122.4 -77,121.2 -77,120 -77,118.8 -77,117.6 -77,116.4 -77,115.2 -77,114 -77,114 -76.7,114 -76.4,114 -76.1,114 -75.8,114 -75.5,114 -75.2,114 -74.9,114 -74.6,114 -74.3,114 -74))"] |
|
Adrenergic and adenosinergic regulation of the cardiovascular system in the Antarctic icefish Chaenocephalus aceratus
|
1341663 1341602 |
2020-12-18 | Joyce, Michael; Axelsson, Michael; Farrell, Anthony; Egginton, Stuart; O'Brien, Kristin |
Collaborative Research: The Physiological and Biochemical Underpinnings of Thermal Tolerance in Antarctic Notothenioid Fishes |
Icefishes characteristically lack the oxygen-binding protein haemoglobin and therefore are especially reliant on cardiovascular regulation to augment oxygen transport when oxygen demand increases, such as during activity and warming. Using both in vivo and in vitro experiments, we evaluated the roles for adrenaline and adenosine, two well-established cardio- and vasoactive molecules, in regulating the cardiovascular system of the blackfin icefish, Chaenocephalus aceratus. Despite increasing cardiac contractility (increasing twitch force and contraction kinetics in isometric myocardial strip preparations) and accelerating heart rate (ƒH), adrenaline (5 nmol kg-1 bolus intra-arterial injection) did not significantly increase cardiac output (Q̇) in vivo because it elicited a large decrease in vascular conductance (Gsys). In contrast, and despite preliminary data suggesting a direct negative inotropic effect of adenosine on isolated atria and little effect on isolated ventricle strips, adenosine (500 nmol kg-1) generated a large increase in Q̇ by increasing Gsys, a change reminiscent of that previously reported during both acute warming and invoked activity. Our data thus illustrate how Q̇ in C. aceratus may be much more dependent on peripheral control of vasomotor tone than direct regulation of the heart. | [] |
|
Acclimation of cardiovascular function in Notothenia coriiceps
|
1341663 |
2020-12-18 | Joyce, William; Egginton, Stuart; Farrell, Anthony; Axelsson, Michael; Crockett, Elizabeth; O'Brien, Kristin |
Collaborative Research: The Physiological and Biochemical Underpinnings of Thermal Tolerance in Antarctic Notothenioid Fishes |
The Southern Ocean has experienced stable, cold temperatures for over 10 million years, yet particular regions are currently undergoing rapid warming. To investigate the impacts of warming on cardiovascular oxygen transport, we compared the cardio-respiratory performance in an Antarctic notothenioid (Notothenia coriiceps) that was maintained at 0 or 5°C for 6.0-9.5 weeks. When compared at the fish's respective acclimation temperature, the oxygen consumption rate and cardiac output were significantly higher in 5°C-acclimated than 0°C-acclimated fish. The 2.7-fold elevation in cardiac output in 5°C-acclimated fish (17.4 vs. 6.5 ml min-1 kg-1) was predominantly due to a doubling of stroke volume, likely in response to increased cardiac preload, as measured by higher central venous pressure (0.15 vs. 0.08 kPa); tachycardia was minor (29.5 vs. 25.2 beats min-1). When fish were acutely warmed, oxygen consumption rate increased by similar amounts in 0°C- and 5°C-acclimated fish at equivalent test temperatures. In both acclimation groups, the increases in oxygen consumption rate during acute heating were supported by increased cardiac output achieved by elevating heart rate, while stroke volume changed relatively little. Cardiac output was similar between both acclimation groups until 12°C when cardiac output became significantly higher in 5°C-acclimated fish, driven largely by their higher stroke volume. Although cardiac arrhythmias developed at a similar temperature (~14.5°C) in both acclimation groups, the hearts of 5°C-acclimated fish continued to pump until significantly higher temperatures (CTmax for cardiac function 17.7 vs. 15.0°C for 0°C-acclimated fish). These results demonstrate that N. coriiceps is capable of increasing routine cardiac output during both acute and chronic warming, although the mechanisms are different (heart rate-dependent versus primarily stroke volume-dependent regulation, respectively). Cardiac performance was enhanced at higher temperatures following 5°C acclimation, suggesting cardiovascular function may not constrain the capacity of N. coriiceps to withstand a warming climate. | [] |
|
Measurements of splenic contraction in Antarctic fishes
|
1341602 1341663 |
2020-12-18 | O'Brien, Kristin; Joyce, William; Axelsson, Michael |
Collaborative Research: The Physiological and Biochemical Underpinnings of Thermal Tolerance in Antarctic Notothenioid Fishes |
In fishes, the spleen can function as an important reservoir for red blood cells (RBCs), which, following splenic contraction, may be released into the circulation to increase haematocrit during energy‐demanding activities. This trait is particularly pronounced in red‐blooded Antarctic fishes in which the spleen can sequester a large proportion of RBCs during rest, thereby reducing blood viscosity, which may serve as an adaptation to life in cold environments. In one species, Pagothenia borchgrevinki, it has previously been shown that splenic contraction primarily depends on cholinergic stimulation. The aim of the present study was to investigate the regulation of splenic contraction in five other Antarctic fish species, three red‐blooded notothenioids (Dissostichus mawsoni Norman, 1937, Gobionotothen gibberifrons Lönnberg, 1905, Notothenia coriiceps Richardson 1844) and two white‐blooded “icefish” (Chaenocephalus aceratus Lönnberg, 1906 and Champsocephalus gunnari Lönnberg, 1905), which lack haemoglobin and RBCs, but nevertheless possess a large spleen. In all species, splenic strips constricted in response to both cholinergic (carbachol) and adrenergic (adrenaline) agonists. Surprisingly, in the two species of icefish, the spleen responded with similar sensitivity to red‐blooded species, despite contraction being of little obvious benefit for releasing RBCs into the circulation. Although the icefish lineage lost functional haemoglobin before diversifying over the past 7.8–4.8 millions of years, they retain the capacity to contract the spleen, likely as a vestige inherited from their red‐blooded ancestors. | [] |
|
Hypoxia response of hearts of Antarctic fishes
|
1341663 1341602 |
2020-12-18 | O'Brien, Kristin |
Collaborative Research: The Physiological and Biochemical Underpinnings of Thermal Tolerance in Antarctic Notothenioid Fishes |
The ability of Antarctic notothenioid fishes to mount a robust molecular response to hypoxia is largely unknown. The transcription factor, hypoxia-inducible factor-1 (HIF-1), a heterodimer of HIF-1α and HIF-1β subunits, is the master regulator of oxygen homeostasis in most metazoans. We sought to determine if, in the hearts of Antarctic notothenioids, HIF-1 is activated and functional in response to either an acute heat stress or hypoxia. The red-blooded Notothenia coriiceps and the hemoglobinless icefish, Chaenocephalus aceratus, were exposed to their critical thermal maximum (CTMAX) or hypoxia (5.0 ± 0.3 mg of O2 L-1) for 2 h. Additionally, N. coriiceps was exposed to 2.3 ± 0.3 mg of O2 L-1 for 12 h, and red-blooded Gobionotothen gibberifrons was exposed to both levels of hypoxia. Levels of HIF-1α were quantified in nuclei isolated from heart ventricles using western blotting. Transcript levels of genes involved in anaerobic metabolism, and known to be regulated by HIF-1, were quantified by real-time PCR, and lactate levels were measured in heart ventricles. Protein levels of HIF-1α increase in nuclei of hearts of N. coriiceps and C. aceratus in response to exposure to CTMAX and in hearts of N. coriiceps exposed to severe hypoxia, yet mRNA levels of anaerobic metabolic genes do not increase in any species, nor do lactate levels increase, suggesting that HIF-1 does not stimulate metabolic remodeling in hearts of notothenioids under these conditions. Together, these data suggest that Antarctic notothenioids may be vulnerable to hypoxic events, which are likely to increase with climate warming. | [] |
|
Cardiac metabolism in Antarctic fishes in response to an acute increase in temperature
|
1341663 |
2020-12-18 | O'Brien, Kristin |
Collaborative Research: The Physiological and Biochemical Underpinnings of Thermal Tolerance in Antarctic Notothenioid Fishes |
Studies in temperate fishes provide evidence that cardiac mitochondrial function and the capacity to fuel cardiac work contribute to thermal tolerance. Here, we tested the hypothesis that decreased cardiac aerobic metabolic capacity contributes to the lower thermal tolerance of the haemoglobinless Antarctic icefish, Chaenocephalus aceratus, compared with that of the red-blooded Antarctic species, Notothenia coriiceps. Maximal activities of citrate synthase (CS) and lactate dehydrogenase (LDH), respiration rates of isolated mitochondria, adenylate levels and changes in mitochondrial protein expression were quantified from hearts of animals held at ambient temperature or exposed to their critical thermal maximum (CTmax). Compared with C. aceratus, activity of CS, ATP concentration and energy charge were higher in hearts of N. coriiceps at ambient temperature and CTmax While state 3 mitochondrial respiration rates were not impaired by exposure to CTmax in either species, state 4 rates, indicative of proton leakage, increased following exposure to CTmax in C. aceratus but not N. coriiceps The interactive effect of temperature and species resulted in an increase in antioxidants and aerobic metabolic enzymes in N. coriiceps but not in C. aceratus Together, our results support the hypothesis that the lower aerobic metabolic capacity of C. aceratus hearts contributes to its low thermal tolerance. | [] |
|
Whillans and Mercer Shear Margin Ice Flow simulation in ISSM
|
1842021 |
2020-12-12 | Kaluzienski, Lynn |
RAPID Proposal: Constraining kinematics of the Whillans/Mercer Ice Stream Confluence |
The dataset includes initialization and output files of a numerical ice flow simulation of the Whillans and Mercer Ice Streams . The Ice Sheet System Model (ISSM) model was used to solve a 100-year transient stress balance solution of the region with ~10 kPA/yr friction increase downstream of the shear margin between the Whillans and Mercer ice streams. | ["POLYGON((-168 -82,-162.3 -82,-156.6 -82,-150.9 -82,-145.2 -82,-139.5 -82,-133.8 -82,-128.1 -82,-122.4 -82,-116.7 -82,-111 -82,-111 -82.6,-111 -83.2,-111 -83.8,-111 -84.4,-111 -85,-111 -85.6,-111 -86.2,-111 -86.8,-111 -87.4,-111 -88,-116.7 -88,-122.4 -88,-128.1 -88,-133.8 -88,-139.5 -88,-145.2 -88,-150.9 -88,-156.6 -88,-162.3 -88,-168 -88,-168 -87.4,-168 -86.8,-168 -86.2,-168 -85.6,-168 -85,-168 -84.4,-168 -83.8,-168 -83.2,-168 -82.6,-168 -82))"] |
|
2017 GPR Observations of the Whillans and Mercer Ice Streams
|
1842021 |
2020-12-12 | Kaluzienski, Lynn |
RAPID Proposal: Constraining kinematics of the Whillans/Mercer Ice Stream Confluence |
The dataset includes GPS coordinates for crevasse/fracture locations picked from 350MHz and 400Mhz frequency GPR dataset in the Whillans/Mercer Shear Margin along the SALSA traverse route with associated kinematic outputs for each feature (shear strain rate, vorticity, dilatation). GPS coordinates are in the Antarctic Polar Stereographic projection (EPSG:3031). | ["POLYGON((-168 -82,-162.3 -82,-156.6 -82,-150.9 -82,-145.2 -82,-139.5 -82,-133.8 -82,-128.1 -82,-122.4 -82,-116.7 -82,-111 -82,-111 -82.5,-111 -83,-111 -83.5,-111 -84,-111 -84.5,-111 -85,-111 -85.5,-111 -86,-111 -86.5,-111 -87,-116.7 -87,-122.4 -87,-128.1 -87,-133.8 -87,-139.5 -87,-145.2 -87,-150.9 -87,-156.6 -87,-162.3 -87,-168 -87,-168 -86.5,-168 -86,-168 -85.5,-168 -85,-168 -84.5,-168 -84,-168 -83.5,-168 -83,-168 -82.5,-168 -82))"] |
|
Supraglacial Lakes in Antarctica
|
1643715 |
2020-12-10 | Moussavi, Mahsa; Pope, Allen; Trusel, Luke; Abdalati, Waleed; Halberstadt, Anna Ruth |
Collaborative Research: Water on the Antarctic Ice Sheet: Quantifying Surface Melt and Mapping Supraglacial Lakes |
This dataset contains extents and depths of supraglacial lakes on ice shelves across the Antarctic ice sheet, mapped from Landsat 8 imagery collected over the 2013-2020 period. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Granulometry of Joinville and Livingston Island beaches
|
0724929 |
2020-11-06 | Theilen, Brittany; Simms, Alexander |
SGER: Testing the use of OSL dating of beach deposits along the Antarctic Peninsula |
["POLYGON((-61.8 -61.3,-61.07 -61.3,-60.34 -61.3,-59.61 -61.3,-58.88 -61.3,-58.15 -61.3,-57.42 -61.3,-56.69 -61.3,-55.96 -61.3,-55.23 -61.3,-54.5 -61.3,-54.5 -61.55,-54.5 -61.8,-54.5 -62.05,-54.5 -62.3,-54.5 -62.55,-54.5 -62.8,-54.5 -63.05,-54.5 -63.3,-54.5 -63.55,-54.5 -63.8,-55.23 -63.8,-55.96 -63.8,-56.69 -63.8,-57.42 -63.8,-58.15 -63.8,-58.88 -63.8,-59.61 -63.8,-60.34 -63.8,-61.07 -63.8,-61.8 -63.8,-61.8 -63.55,-61.8 -63.3,-61.8 -63.05,-61.8 -62.8,-61.8 -62.55,-61.8 -62.3,-61.8 -62.05,-61.8 -61.8,-61.8 -61.55,-61.8 -61.3))"] | |
|
South Pole Ice Core Holocene Major Ion Dataset
|
1443397 1443105 1141839 1443663 1443336 |
2020-11-05 | Winski, Dominic A. |
Collaborative Research: Record of the Triple-oxygen Isotope and Hydrogen Isotope Composition of Ice from an Ice Core at South Pole Collaborative Research: South Pole Ice Core Chronology and Climate Records using Chemical and Microparticle Measurements Collaborative Research: A 1500m Ice Core from South Pole |
This dataset includes major ion and seasonal sea salt chemistry data from the South Pole Ice Core. Included are the raw major ion data, annually resolved mean, maximum and minimum sea salt sodium concentrations and centennially resolved principal components (discussed in Winski et al. (in review). | ["POINT(-89.16 -89.99)"] |
|
N2O Concentration and Isotope Data for 74-59 ka from Taylor Glacier, Antarctica
|
1246148 1245659 1245821 |
2020-11-02 | Menking, James; Brook, Edward J.; Schilt, Adrian; Shackleton, Sarah; Dyonisius, Michael; Severinghaus, Jeffrey P.; Petrenko, Vasilii |
Collaborative Research: The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive |
Ice core measurements of the concentration and stable isotopic composition of atmospheric nitrous oxide (N2O) 74,000-59,000 years ago constrain marine and terrestrial emissions. The data include two major Dansgaard-Oeschger (D-O) events and the N2O decrease during global cooling at the Marine Isotope Stage (MIS) 5a-4 transition. The N2O increase associated with D-O 19 (~73-71.5 ka) was driven by equal contributions from marine and terrestrial emissions. The N2O decrease during the transition into MIS 4 (~71.5-67.5 ka) was caused by gradual reductions of similar magnitude in both marine and terrestrial sources. A 50 ppb increase in N2O concentration at the end of MIS 4 was caused by gradual increases in marine and terrestrial emissions between ~64-61 ka, followed by an abrupt increase in marine emissions at the onset of D-O 16/17 (59.5 ka). This suggests that the importance of marine versus terrestrial emissions in controlling millennial-scale N2O fluctuations varied in time. | [] |
|
Temperature, accumulation rate, and layer thinning from the South Pole ice core (SPC14)
|
1443105 |
2020-10-28 | Kahle, Emma; Steig, Eric J.; Jones, Tyler R.; Fudge, T. J.; Koutnik, Michelle; Morris, Valerie; Vaughn, Bruce; Schauer, Andrew; Stevens, Max; Conway, Howard; Waddington, Edwin D.; Buizert, Christo; Epifanio, Jenna; White, James |
Collaborative Research: A 1500m Ice Core from South Pole Collaborative Research: Record of the Triple-oxygen Isotope and Hydrogen Isotope Composition of Ice from an Ice Core at South Pole |
This data set provides the input and output data used in Kahle et al. 2020 to reconstruct climate variables at the South Pole. The files below include high resolution water isotopes, water isotope diffusion length, and various reconstructions of temperature, accumulation rate, and thinning function for the SPC14 ice core. An inverse approach was used to combine information from water isotope diffusion length, Dage, and annual-layer thickness to solve for temperature, accumulation rate, and thinning function. Corrections were applied to account for the advection of ice from upstream to yield estimates for the South Pole site. | ["POINT(180 -90)"] |
|
Vulnerability of Antarctica’s ice shelves to meltwater-driven fracture
|
1743310 |
2020-10-24 | Lai, Ching-Yao | No project link provided | This data set contains the results presented in Lai et al. (2020), including; the 125m-resolution fracture map, the spatial distribution of fracture depths and the required initial flaw size for hydrofracture, which is calculated using linear elastic fracture mechanics (LEFM) according to the ice-shelf stress fields and thickness. The dimensionless stress (Rxx_bar, defined in Lai et al. (2020)) governs how fractures behave. Using a dimensionless stress criteria we have determined which ice-shelf areas are vulnerable to hydrofracture if inundated with melt water (Rxx_bar >Rxx*_bar). | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Multi-site ice core Krypton stable isotope ratios
|
1543229 1543267 |
2020-10-22 | Buizert, Christo; Shackleton, Sarah; Severinghaus, Jeffrey P.; Brook, Edward J.; Baggenstos, Daniel; Bereiter, Bernhard; Etheridge, David; Bertler, Nancy; Pyne, Rebecca L.; Mulvaney, Robert; Mosley-Thompson, Ellen |
Collaborative research: Kr-86 as a proxy for barometric pressure variability and movement of the SH westerlies during the last
deglaciation |
Stable isotope ratios of atmospheric krypton, argon, nitrogen and oxygen were measured in late-Holocene ice core samples from nine sites in Antarctica and Greenland, for the purpose of calibrating the Kr-86 excess proxy as defined in Buizert and Severinghaus (2016). | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Density, hydrology and geophysical measurements from the Wilkins Ice Shelf firn aquifer
|
1745116 |
2020-10-21 | Miège, Clément; Montgomery, Lynn; Miller, Julie; Scambos, Ted; Wallin, Bruce; Miller, Olivia; Solomon, Kip; Forster, Richard; Koenig, Lora |
Antarctic Firn Aquifers: Extent, Characteristics, and Comparison with Greenland Occurrences |
This dataset compiles a suite of glaciology (density, stratigraphy), hydrology (slug and dilution tests) and geophysical measurements (GPS, GPR, ApRES) to characterize a firn aquifer observed within the Wilkins Ice Shelf, Antarctica. | ["POLYGON((-72 -70.75,-71.95 -70.75,-71.9 -70.75,-71.85 -70.75,-71.8 -70.75,-71.75 -70.75,-71.7 -70.75,-71.65 -70.75,-71.6 -70.75,-71.55 -70.75,-71.5 -70.75,-71.5 -70.775,-71.5 -70.8,-71.5 -70.825,-71.5 -70.85,-71.5 -70.875,-71.5 -70.9,-71.5 -70.925,-71.5 -70.95,-71.5 -70.975,-71.5 -71,-71.55 -71,-71.6 -71,-71.65 -71,-71.7 -71,-71.75 -71,-71.8 -71,-71.85 -71,-71.9 -71,-71.95 -71,-72 -71,-72 -70.975,-72 -70.95,-72 -70.925,-72 -70.9,-72 -70.875,-72 -70.85,-72 -70.825,-72 -70.8,-72 -70.775,-72 -70.75))"] |
|
Stable isotope analysis of multiple tissues from chick carcasses of three pygoscelid penguins in Antarctica
|
1443386 |
2020-10-11 | Ciriani, Yanina; Emslie, Steven |
Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators |
Many types of animal tissues are increasingly being used for stable isotope analysis, with their application dependent on the time frame they reflect and their availability for collection. Here, we investigated the isotopic values (δ13C and δ15N) of four tissues (feather, skin, toenail, and bone) collected from fledgling-period chick carcasses of three species of pygoscelid penguins to compare the variability and accuracy of the data among tissues. Samples were collected at 25 de Mayo/King George Island during the 2017/18 austral summer. Chick carcasses are commonly found at active penguin colonies, and “opportunistic sampling” can easily be performed without disturbing nesting penguins. A total of 25–36 carcasses per species were sampled at active colonies of Adélie Pygoscelis adeliae, Gentoo P. papua, and Chinstrap P. antarcticus penguins. A linear mixed model showed that δ13C values varied significantly between tissues, presumably due to tissue-specific isotopic discrimination. In contrast, the only tissue with significantly different δ15N values was toenail. Stable isotope data revealed dietary differences among species, with Gentoo Penguins having higher average isotopic values in tissues compared to Adélie and Chinstrap penguins. In addition, Chinstrap Penguins showed a consistent, but not statistically significant, trend in having higher δ13C values compared to Adélie Penguins. Gentoo Penguins displayed the highest isotopic variability of any species for all tissues. Isotopic composition was most variable in skin in all three species making skin the least reliable tissue for isotope analysis, whereas isotopic values were least variable in toenails. Comparison of isotopic values between two bones (tibiotarsus and coracoid) showed no significant differences in isotopic values, indicating that when the same bone is not available for sampling from carcasses, sampling of any major skeletal element is likely to provide a meaningful comparison. These results allow for more informed opportunistic sampling to accurately estimate and compare penguin diet among species and between ancient and active colonies. | ["POLYGON((-58.62 -62.257,-58.6199 -62.257,-58.6198 -62.257,-58.6197 -62.257,-58.6196 -62.257,-58.6195 -62.257,-58.6194 -62.257,-58.6193 -62.257,-58.6192 -62.257,-58.6191 -62.257,-58.619 -62.257,-58.619 -62.2571,-58.619 -62.2572,-58.619 -62.2573,-58.619 -62.2574,-58.619 -62.2575,-58.619 -62.2576,-58.619 -62.2577,-58.619 -62.2578,-58.619 -62.2579,-58.619 -62.258,-58.6191 -62.258,-58.6192 -62.258,-58.6193 -62.258,-58.6194 -62.258,-58.6195 -62.258,-58.6196 -62.258,-58.6197 -62.258,-58.6198 -62.258,-58.6199 -62.258,-58.62 -62.258,-58.62 -62.2579,-58.62 -62.2578,-58.62 -62.2577,-58.62 -62.2576,-58.62 -62.2575,-58.62 -62.2574,-58.62 -62.2573,-58.62 -62.2572,-58.62 -62.2571,-58.62 -62.257))"] |
|
SP19 Gas Chronology
|
1443464 1443472 1643394 1443470 1142517 1443397 1443710 1443105 1141839 1804154 |
2020-10-09 | Epifanio, Jenna |
Collaborative Research: Inert Gas and Methane Based Climate Records throughout the South Pole Deep Ice Core Carbonyl Sulfide, Methyl Chloride, and Methyl Bromide Measurements in the New Intermediate-depth South Pole Ice Core Collaborative Research: Record of the Triple-oxygen Isotope and Hydrogen Isotope Composition of Ice from an Ice Core at South Pole Collaborative Research: Inert Gas and Methane Based Climate Records throughout the South Pole Deep Ice Core Collaborative Research: A 1500m Ice Core from South Pole Collaborative Research: A 1500m Ice Core from South Pole |
We present the SP19 gas chronology for the South Pole ice core. The chronology is based on stratigraphic matching of abrupt methane (CH4) changes. To construct the chronology, abrupt changes in CH4 during the glacial period and small, 20-30ppb, centennial scale changes in CH4 were used with analogous data from the West Antarctic Ice Sheet Divide ice core. Stratigraphic matching was verified by an optimization algorithm. The ages cover the last 52,586 years. Absolute uncertainty increases with depth until ± 540 years. | ["POINT(99.16 -89.99)"] |
|
South Pole ice core (SPC14) discrete methane data
|
1141839 1804154 1443464 1443397 1443710 1443336 1643394 1443472 1443470 1142517 |
2020-10-09 | Epifanio, Jenna; Brook, Edward J.; Buizert, Christo; Severinghaus, Jeffrey; Kreutz, Karl; Aydin, Murat; Edwards, Jon S.; Sowers, Todd A.; Kahle, Emma; Steig, Eric J.; Winski, Dominic A.; Osterberg, Erich; Fudge, T. J.; Hood, Ekaterina; Kalk, Michael; Ferris, David G.; Kennedy, Joshua A. |
Carbonyl Sulfide, Methyl Chloride, and Methyl Bromide Measurements in the New Intermediate-depth South Pole Ice Core Collaborative Research: Inert Gas and Methane Based Climate Records throughout the South Pole Deep Ice Core Collaborative Research: Inert Gas and Methane Based Climate Records throughout the South Pole Deep Ice Core Collaborative Research: A 1500m Ice Core from South Pole Collaborative Research: South Pole Ice Core Chronology and Climate Records using Chemical and Microparticle Measurements Collaborative Research: A 1500m Ice Core from South Pole |
We present the methane (CH4) concentration data for the South Pole ice core (SPC14). CH4 concentrations were measured jointly at Oregon State University and Pennsylvania State University. All depths are in meters below the surface. Methane data have been corrected for blank offsets, solubility, and gravitational fractionation. All ages are in years before 1950 C.E. on the SP19 gas chronology. | ["POINT(-99.16 -89.99)"] |
|
Argon thermochronological data on detrital mineral grains from the Weddell Sea embayment
|
1724670 |
2020-10-05 | Williams, Trevor |
Collaborative Research: Deglacial Ice Dynamics in the Weddell Sea Embayment using Sediment Provenance |
This dataset contains 40Ar/39Ar measurements on detrital mineral grains from subglacial till and proximal glacimarine sediment from nine sediment cores along the front of the Filchner and Ronne Ice Shelves. | ["POLYGON((-65 -74,-61 -74,-57 -74,-53 -74,-49 -74,-45 -74,-41 -74,-37 -74,-33 -74,-29 -74,-25 -74,-25 -74.6,-25 -75.2,-25 -75.8,-25 -76.4,-25 -77,-25 -77.6,-25 -78.2,-25 -78.8,-25 -79.4,-25 -80,-29 -80,-33 -80,-37 -80,-41 -80,-45 -80,-49 -80,-53 -80,-57 -80,-61 -80,-65 -80,-65 -79.4,-65 -78.8,-65 -78.2,-65 -77.6,-65 -77,-65 -76.4,-65 -75.8,-65 -75.2,-65 -74.6,-65 -74))"] |
|
Argon thermochronological data on detrital mineral grains from the Weddell Sea embayment
|
1724670 |
2020-10-05 | Williams, Trevor |
Collaborative Research: Deglacial Ice Dynamics in the Weddell Sea Embayment using Sediment Provenance |
This dataset contains 40Ar/39Ar measurements on detrital mineral grains from till in modern moraines at the edges of the Institute, Foundation, Academy, Recovery, and the Slessor glaciers / ice streams. | ["POLYGON((-70 -80,-65 -80,-60 -80,-55 -80,-50 -80,-45 -80,-40 -80,-35 -80,-30 -80,-25 -80,-20 -80,-20 -80.6,-20 -81.2,-20 -81.8,-20 -82.4,-20 -83,-20 -83.6,-20 -84.2,-20 -84.8,-20 -85.4,-20 -86,-25 -86,-30 -86,-35 -86,-40 -86,-45 -86,-50 -86,-55 -86,-60 -86,-65 -86,-70 -86,-70 -85.4,-70 -84.8,-70 -84.2,-70 -83.6,-70 -83,-70 -82.4,-70 -81.8,-70 -81.2,-70 -80.6,-70 -80))"] |
|
Argon thermochronological data on detrital mineral grains from the Weddell Sea embayment
|
1724670 |
2020-10-05 | Williams, Trevor |
Collaborative Research: Deglacial Ice Dynamics in the Weddell Sea Embayment using Sediment Provenance |
This dataset contains 40Ar/39Ar measurements on detrital mineral grains from ice-rafted detritus from sediment core PS1575-1 in the NW Weddell Sea. The depositional age of the sediments is approx. 0 to 300 ka. | ["POLYGON((-50 -62,-49 -62,-48 -62,-47 -62,-46 -62,-45 -62,-44 -62,-43 -62,-42 -62,-41 -62,-40 -62,-40 -62.3,-40 -62.6,-40 -62.9,-40 -63.2,-40 -63.5,-40 -63.8,-40 -64.1,-40 -64.4,-40 -64.7,-40 -65,-41 -65,-42 -65,-43 -65,-44 -65,-45 -65,-46 -65,-47 -65,-48 -65,-49 -65,-50 -65,-50 -64.7,-50 -64.4,-50 -64.1,-50 -63.8,-50 -63.5,-50 -63.2,-50 -62.9,-50 -62.6,-50 -62.3,-50 -62))"] |
|
3He input data
|
1443213 |
2020-09-30 | Kaplan, Michael; Winckler, Gisela; Schaefer, Joerg |
Collaborative Research: Multidisciplinary Analysis of Antarctic Blue Ice Moraine Formation and their Potential as Climate Archives over Multiple Glacial Cycles |
Input and other information for 3He surface exposure data | [] |
|
10Be and 26Al cosmogenic nuclide surface exposure data
|
1443213 |
2020-09-30 | Kaplan, Michael; Schaefer, Joerg; Winckler, Gisela |
Collaborative Research: Multidisciplinary Analysis of Antarctic Blue Ice Moraine Formation and their Potential as Climate Archives over Multiple Glacial Cycles |
Sample metadata or information for cosmogenic-nuclide exposure data from the Mt. Achernar area. | ["POLYGON((-180 -84.1,-176.97 -84.1,-173.94 -84.1,-170.91 -84.1,-167.88 -84.1,-164.85 -84.1,-161.82 -84.1,-158.79 -84.1,-155.76 -84.1,-152.73 -84.1,-149.7 -84.1,-149.7 -84.43,-149.7 -84.76,-149.7 -85.09,-149.7 -85.42,-149.7 -85.75,-149.7 -86.08,-149.7 -86.41,-149.7 -86.74,-149.7 -87.07,-149.7 -87.4,-152.73 -87.4,-155.76 -87.4,-158.79 -87.4,-161.82 -87.4,-164.85 -87.4,-167.88 -87.4,-170.91 -87.4,-173.94 -87.4,-176.97 -87.4,180 -87.4,178.12 -87.4,176.24 -87.4,174.36 -87.4,172.48 -87.4,170.6 -87.4,168.72 -87.4,166.84 -87.4,164.96 -87.4,163.08 -87.4,161.2 -87.4,161.2 -87.07,161.2 -86.74,161.2 -86.41,161.2 -86.08,161.2 -85.75,161.2 -85.42,161.2 -85.09,161.2 -84.76,161.2 -84.43,161.2 -84.1,163.08 -84.1,164.96 -84.1,166.84 -84.1,168.72 -84.1,170.6 -84.1,172.48 -84.1,174.36 -84.1,176.24 -84.1,178.12 -84.1,-180 -84.1))"] |
|
Ancient Adelie penguin colony revealed by snowmelt at Cape Irizar, Ross Sea, Antarctica
|
1443386 |
2020-09-24 | Emslie, Steven |
Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators |
This dataset provides the results of radiocarbon and stable isotope analyses of Adelie penguin chick bone collagen. | ["POINT(162.95 -75.55)"] |
|
ANTAEM project airborne EM resistivity data from McMurdo Region
|
1644187 |
2020-09-12 | Tulaczyk, Slawek |
Collaborative Research: Antarctic Airborne ElectroMagnetics (ANTAEM) - Revealing Subsurface Water in Coastal Antarctica |
The ANTAEM survey was carried out in the period November 12th to 28th, 2018, with the SkyTEM 312 system. Twenty-one missions (flights) were conducted over 11 production days of helicopter service, resulting in a total of approximately ~3400 line km of data. The SkyTEM system records data from take-off until landing resulting in multiple lines converging to the landing pads in McMurdo and at Marble Point. The production without overlapping lines adds up to approximately 2900 line km. The flight speed was approximately 120 km/h at a target flight altitude of ~50 m (sensor height), but the actual sensor height varies depending on the terrain. The surveys were carried out with a Bell 212 helicopter, which carried the SkyTEM sensor as a sling load. The SkyTEM system was configured in a standard two-moment setup (low moment, LM and high moment, HM). Areas with extremely resistive dry and/or frozen sediment/bedrock, and glacier ice often produce EM-signals with amplitudes below the detection level of the system. Data from these low signal environments cannot be inverted into resistivity models. Data with strong induced polarization effects cannot be inverted for resistivity either. These data were discharged in this standard data delivery. The EM-data and inversion result (resistivity models) are delivered in the SkyTEM2018_dat.xyz and SkyTEM2018_inv.xyz files respectably. The RECORD number in the two files links data and model together. EM-data and data uncertainty for data entering inversion. Info stated in file Header: NAN value, Data unit, Coordinate system, Gate times. The SkyTEM system uses at High-Low moment data recording cycle, therefore only a subset of the total 40 time gates are preset for each moment. The standard lateral constraints inversion (LCI), delivered in the SkyTEM2018_inv.xyz file, was carried out with a smooth 30 layered resistivity model discretized to a depth of 500 m. A depth of investigation (DOI) was estimated for each resistivity model. | ["POLYGON((161 -76.9,161.75 -76.9,162.5 -76.9,163.25 -76.9,164 -76.9,164.75 -76.9,165.5 -76.9,166.25 -76.9,167 -76.9,167.75 -76.9,168.5 -76.9,168.5 -77.04,168.5 -77.18,168.5 -77.32,168.5 -77.46,168.5 -77.6,168.5 -77.74,168.5 -77.88,168.5 -78.02,168.5 -78.16,168.5 -78.3,167.75 -78.3,167 -78.3,166.25 -78.3,165.5 -78.3,164.75 -78.3,164 -78.3,163.25 -78.3,162.5 -78.3,161.75 -78.3,161 -78.3,161 -78.16,161 -78.02,161 -77.88,161 -77.74,161 -77.6,161 -77.46,161 -77.32,161 -77.18,161 -77.04,161 -76.9))"] |
|
ICECAP Basal Interface Specularity Content Profiles: IPY and OIB
|
0636724 0733025 1443690 1543452 |
2020-08-24 | Young, Duncan A.; Blankenship, Donald D.; Roberts, Jason; Siegert, Martin; van Ommen, Tas; Greenbaum, Jamin; Schroeder, Dustin |
Collaborative Research: Southern Plateau Ice-sheet Characterization and Evolution of the Central Antarctic Plate (SPICECAP) East Antarctic Grounding Line Experiment (EAGLE) IPY Research: Investigating the Cryospheric Evolution of the Central Antarctic Plate (ICECAP) Collaborative Research: Synthesis of Thwaites Glacier Dynamics: Diagnostic and Prognostic Sensitivity Studies of a West Antarctic Outlet System |
The International Collaborative Exploration of the Cryosphere though Airborne Profiling (ICECAP) collected five seasons of aerogeophysical data data through the NSFs International Polar Year and NASAs Operation Ice Bridge programs in East Antarctica, using the coherent HiCARS 60 MHz radar system. By comparing echo strengths for different focusing apertures, and accounting for the ranges and angles involved, we can derive the "specularity content" of the bed echo, a proxy for small scale bed roughness and a good indicator for subglacial water pressure in regions of distributed subglacial water (Schroeder et al., 2014, IEEE GRSL, 10.1109/LGRS.2014.2337878; IEEE; Dow et al., 2019, EPSL https://doi.org/10.1016/j.epsl.2019.115961). Specularity data are inherently noisy, so these products have been smoothed with a 1 km filter. | ["POLYGON((80 -65,89 -65,98 -65,107 -65,116 -65,125 -65,134 -65,143 -65,152 -65,161 -65,170 -65,170 -66.5,170 -68,170 -69.5,170 -71,170 -72.5,170 -74,170 -75.5,170 -77,170 -78.5,170 -80,161 -80,152 -80,143 -80,134 -80,125 -80,116 -80,107 -80,98 -80,89 -80,80 -80,80 -78.5,80 -77,80 -75.5,80 -74,80 -72.5,80 -71,80 -69.5,80 -68,80 -66.5,80 -65))"] |
|
Concentrations and Particle Size Distributions of Aerosol Trace Elements
|
1341494 |
2020-08-24 | Gao, Yuan |
Quantifying Atmospheric Iron Properties over West Antarctic Peninsula |
The dataset includes the concentrations and particle size distributions of aerosol trace elements (TEs) through the sampling of size-segregated aerosol particles made at Palmer Station, Antarctic Peninsula, which took place in the austral summer of 2016-2017. The estimated dry deposition fluxes of these elements were derived from these new results. | ["POINT(64 64)"] |
|
7MHz radar in the vicinity of South Pole
|
1443471 |
2020-08-20 | Conway, Howard; Koutnik, Michelle; Fudge, T. J.; Waddington, Edwin; Lilien, David; Stevens, Max |
Collaborative Research: Characterization of Upstream Ice and Firn Dynamics affecting the South Pole Ice Core |
This data set contains ice-penetrating radar measurements of surface topography, ice thickness, internal stratigraphy, and derived bed topography in the vicinity of South Pole. | ["POLYGON((-180 -89,-166.5 -89,-153 -89,-139.5 -89,-126 -89,-112.5 -89,-99 -89,-85.5 -89,-72 -89,-58.5 -89,-45 -89,-45 -89.1,-45 -89.2,-45 -89.3,-45 -89.4,-45 -89.5,-45 -89.6,-45 -89.7,-45 -89.8,-45 -89.9,-45 -90,-58.5 -90,-72 -90,-85.5 -90,-99 -90,-112.5 -90,-126 -90,-139.5 -90,-153 -90,-166.5 -90,180 -90,173 -90,166 -90,159 -90,152 -90,145 -90,138 -90,131 -90,124 -90,117 -90,110 -90,110 -89.9,110 -89.8,110 -89.7,110 -89.6,110 -89.5,110 -89.4,110 -89.3,110 -89.2,110 -89.1,110 -89,117 -89,124 -89,131 -89,138 -89,145 -89,152 -89,159 -89,166 -89,173 -89,-180 -89))"] |
|
Ice Diver Madison Run #1 March 1, 2020
|
1745049 |
2020-08-03 | Tyler, Scott W. |
Collaborative Research: Toward Dense Observation of Geothermal Fluxes in Antarctica Via Logistically Light Instrument Deployment |
This dataset consists of individual Distributed Temperature Sensing (DTS) traces taken during the first melt test of the Ice Diver drill. The data consists of header information about the instrument, time of sampling and follows with distance down the fiber, Stokes return, anti-Stokes return and estimated temperature in C. Each file represents a 30 second integration of return signals, and the spatial sampling of the fiber was 12.5 cm. Two channels are included and represent data from two individual multimode fibers within a stainless steel tube cable. | ["POLYGON((-180 43.0731,-153.05989 43.0731,-126.11978 43.0731,-99.17967 43.0731,-72.23956 43.0731,-45.29945 43.0731,-18.35934 43.0731,8.58077 43.0731,35.52088 43.0731,62.46099 43.0731,89.4011 43.0731,89.4011 43.07309,89.4011 43.07308,89.4011 43.07307,89.4011 43.07306,89.4011 43.07305,89.4011 43.07304,89.4011 43.07303,89.4011 43.07302,89.4011 43.07301,89.4011 43.073,62.46099 43.073,35.52088 43.073,8.58077 43.073,-18.35934 43.073,-45.29945 43.073,-72.23956 43.073,-99.17967 43.073,-126.11978 43.073,-153.05989 43.073,180 43.073,170.94012 43.073,161.88024 43.073,152.82036 43.073,143.76048 43.073,134.7006 43.073,125.64072 43.073,116.58084 43.073,107.52096 43.073,98.46108 43.073,89.4012 43.073,89.4012 43.07301,89.4012 43.07302,89.4012 43.07303,89.4012 43.07304,89.4012 43.07305,89.4012 43.07306,89.4012 43.07307,89.4012 43.07308,89.4012 43.07309,89.4012 43.0731,98.46108 43.0731,107.52096 43.0731,116.58084 43.0731,125.64072 43.0731,134.7006 43.0731,143.76048 43.0731,152.82036 43.0731,161.88024 43.0731,170.94012 43.0731,-180 43.0731))"] |
|
Ice Core Air Ethane and Acetylene Measurements - South Pole SPC14 Ice Core (SPICEcore project)
|
1644245 |
2020-07-30 | Aydin, Murat; Saltzman, Eric |
Ethane Measurements in the Intermediate Depth South Pole Ice Core (SPICECORE) |
This is a data set of ice core air ethane and acetylene measurements. Both gases were analyzed in air extracted from the South Pole SPC14 ice core at 149 discrete depths as shown in the data file. Ice core air was extracted using a wet extraction method. This data set includes the ethane and acetylene measurements from the younger (last 2ky) sections of the SPC14 ice core published separately in an earlier data set from the same ice core (doi:10.18739/A2J09W45H). | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
ECM (DC and AC) multi-track data and images from 2016 processing season
|
1443232 |
2020-07-28 | Fudge, T.J. |
Using Electrical Conductance Measurements to Develop the South Pole Ice Core Chronology |
These data were collected with DC and AC ECM at the NSF Ice Core Facility. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Resampling of Deep Polar Ice Cores using Information Theory
|
1043167 |
2020-07-27 | Jones, Tyler; Garland, Joshua; Morris, Valerie A.; Vaughn, Bruce; White, James |
Collaborative Research: Stable Isotopes of Ice in the Transition and Glacial Sections of the WAIS Divide Deep Ice Core |
The original water stable isotope data for the WAIS Divide Deep Ice Core was generated under the University of Colorado INSTAAR Stable Isotope Lab (NSF Award# 1443328). This data set contains high-resolution dD and d18O data for the West Antarctic Ice Sheet (WAIS) Divide Ice core. Drilling was initiated in 2006 and completed in 2011, and subsequent analyses on the ice were performed at the University of Colorado INSTAAR Stable Isotope Lab using Continuous Flow Analysis (CFA), completed in 2015 and described in Jones et al. (2017). The targeted resampling of the WAIS Divide Ice core (1035.4 to 1368.2 m) was completed in 2019 (NSF OPP - Antarctic Glaciology 1807522) to replace data analyzed on an older generation Laser Absorption Spectroscopy instrument. The resampling interval was identified using information theory (Garland and Jones et al. 2018). | ["POINT(-112.1115 -79.481)"] |
|
Radiocarbon dating and stable isotope values of penguin and seal tissues recovered from ornithogenic soils on Platter Island, Danger Islands Archipelago, Antarctic Peninsula in December 2015.
|
1443386 1443424 1826712 1443585 |
2020-07-24 | Kalvakaalva, Rohit; Clucas, Gemma; Herman, Rachael; Polito, Michael |
Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators |
This data set focuses on ornithogenic soils excavated from a test pit located in an active colony of Pygoscelis spp. penguins on Platter Island in the Danger Islands archipelago along the northeastern side of the Antarctic Peninsula in December 2015. It contains radiocarbon dates of recovered penguin tissues and the estimated age of ornithogenic soils by depth. It also contains measurements of carbon (δ13C) and nitrogen (δ15N) stable isotope values of Pygoscelis spp. penguins eggshell membrane and feather samples and Antarctic fur seal (Arctocephalus gazella) hair sample recovered from these ornithogenic soils. Accelerator Mass Spectrometry (AMS) was used to obtain radiocarbon dates at the Woods Hole National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility. Radiocarbon Dates were corrected for the marine carbon reservoir effect and calibrated to calendar years before present (cal years BP) using a ΔR of 750 ± 50 years and the MARINE13 calibration curve in Calib 7.04. The rbacon package ver. 2.3.9.1 in R was used to estimate age at depth of each soil level expressed as years relative to the common era (CE). Stable isotope analyses were conducted using an elemental analyzer coupled to a continuous flow stable isotope ratio mass spectrometer at Louisiana State University. The data set also includes associated data such as excavation date, location, site names, latitude/longitude, species, date of excavation, tissue used for radiocarbon dating, and carbon to nitrogen ratios. Details of the data set and all relevant methods are provided in Kalvakaalva et. al., 2020. | ["POINT(-54.67855 -63.434067)"] |
|
Isotopic data from Whillans Ice Stream grounding zone, West Antarctica
|
None | 2020-07-15 | Venturelli, Ryan A |
Collaborative Research: Subglacial Antarctic Lakes Scientific Access (SALSA): Integrated Study of Carbon Cycling in Hydrologically-active Subglacial Environments |
This dataset contains total organic carbon (%TOC) and carbon isotopic data (δ¹³C, Δ¹⁴C) from sediments retrieved from the Whillans Ice Stream grounding zone during the 2015 Antarctic field season. All %TOC and sediment preparations were done at the University of South Florida. Radiocarbon measurements were done at the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) laboratory. | ["POINT(-163.61187 -84.33543)"] |
|
Ice Core Air Carbonyl Sulfide Measurements - Taylor Dome M3C1 Ice Core
|
0636953 1043780 0839122 |
2020-07-15 | Aydin, Murat; Saltzman, Eric |
Carbonyl Sulfide Measurements in the Deep West Antarctic Ice Sheet Divide Ice Core Methyl Chloride, Methyl Bromide, and Carbonyl Sulfide in Deep Antarctic Ice Cores Collaborative Research: Integrated High Resolution Chemical and Biological Measurements on the Deep WAIS Divide Core |
This is a data set of ice core carbonyl sulfide data. Carbonyl sulfide was analyzed in air extracted from the Taylor Dome M3C1 ice core at 106 discrete depths as indicated in the data file. This data set includes all COS data presented in a prior data set from the same ice core (/doi.org/10.7265/N5S75D8P) that were analyzed from 2008 through 2010. This data set includes additional data from the same ice core that were analyzed at a later date in 2014. The two sets of measurements are presented as one data set as the same extraction and analytical methods were used for both sets of analyses. Refer to the references associated with the data set for details on the methods. | [] |
|
Roosevelt Island Ice Core Time Scale and Associated Data
|
0944021 |
2020-07-13 | Brook, Edward J.; Lee, James |
Collaborative Research: Deglaciation of the Ross Sea Embayment - constraints from Roosevelt Island |
Data archived here were used to create the Roosevelt Island Ice Core gas age and ice age time scales. Data include methane concentrations, nitrogen and oxygen isotope ratios of N2 and O2, total air content and the D/H ratio of the ice. Derived products included here include ice age and gas age time scales. | ["POLYGON((-163 -79,-162.8 -79,-162.6 -79,-162.4 -79,-162.2 -79,-162 -79,-161.8 -79,-161.6 -79,-161.4 -79,-161.2 -79,-161 -79,-161 -79.05,-161 -79.1,-161 -79.15,-161 -79.2,-161 -79.25,-161 -79.3,-161 -79.35,-161 -79.4,-161 -79.45,-161 -79.5,-161.2 -79.5,-161.4 -79.5,-161.6 -79.5,-161.8 -79.5,-162 -79.5,-162.2 -79.5,-162.4 -79.5,-162.6 -79.5,-162.8 -79.5,-163 -79.5,-163 -79.45,-163 -79.4,-163 -79.35,-163 -79.3,-163 -79.25,-163 -79.2,-163 -79.15,-163 -79.1,-163 -79.05,-163 -79))"] |
|
Ice Core Air Carbonyl Sulfide Measurements - SPRESSO Ice Core
|
0338359 0440602 |
2020-07-10 | Aydin, Murat; Saltzman, Eric |
Collaborative Research: Gases in Firn Air and Shallow Ice at the Proposed WAIS Divide Drilling Site Methyl chloride and methyl bromide in Antarctic ice cores |
This is a data set of ice core carbonyl sulfide data. Carbonyl sulfide was analyzed in air extracted from the SPRESSO ice core at 106 discrete depths as indicated in the data file. SPRESSO is a shallow, dry-drilled ice core from the South Pole. | [] |
|
Antarctic Tide Gauge Database, version 1
|
1443677 0125602 0125252 |
2020-07-10 | Howard, Susan L.; Padman, Laurence; King, Matt |
Ocean Tides around Antarctica and in the Southern Ocean |
The Antarctic Tide Gauge (AntTG) database provides tidal harmonic coefficients (amplitude and phase) for ocean surface height (tide-induced height perturbation relative to the seabed) at many coastal, ocean and ice shelf locations around Antarctica. The coefficients are provided for up to 8 tidal constituents (Q1, O1, P1, K1, N2 , M2, S2, K2) where data is available. These coefficients are primarily intended for users interested in validation of tide models for the Antarctic seas including the areas covered by the floating ice shelves (e.g., King and Padman, 2005; King et al., 2011; Stammer et al., 2014). The database is provided as single files in ASCII text and MATLAB *.mat formats, as well as in a KML package that can be viewed in Google Earth. Several different measurement systems were used to collect the data. The quality of database entries varies widely, from short records of unknown accuracy to very precise, long-term records from bottom pressure recorders in the ocean and GPS systems installed on ice shelves. This database provides sufficient quality control information (record length, time step, and measurement type) for a user to judge whether a tidal analysis at a particular site is likely to be useful for their application. | ["POLYGON((-180 -53,-144 -53,-108 -53,-72 -53,-36 -53,0 -53,36 -53,72 -53,108 -53,144 -53,180 -53,180 -56.7,180 -60.4,180 -64.1,180 -67.8,180 -71.5,180 -75.2,180 -78.9,180 -82.6,180 -86.3,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -86.3,-180 -82.6,-180 -78.9,-180 -75.2,-180 -71.5,-180 -67.8,-180 -64.1,-180 -60.4,-180 -56.7,-180 -53))"] |
|
Carbon monoxide mixing ratios and stable isotopic values, SPICE
|
1443482 |
2020-07-09 | Mak, John |
Collaborative Research: Using Stable Isotopes to Constrain the Atmospheric Carbon Monoxide Budget over the Last 20,000 Years |
Data from measurement of CO mixing ratios and stable isotopes from the South Pole Ice Core for the first ca 10,000 years BP | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
ICECAP: High resolution survey of the Little Dome C region in support of the IPICS Old Ice goal
|
1443690 |
2020-07-07 | Young, Duncan A.; Roberts, Jason; Blankenship, Donald D.; van Ommen, Tas; Richter, Thomas; Greenbaum, Jamin; Cavitte, Marie G. P; Beem, Lucas H.; Quartini, Enrica; Tozer, Carly; Ng, Gregory; Habbal, Feras; Kempf, Scott D.; Ritz, Catherine |
Collaborative Research: Southern Plateau Ice-sheet Characterization and Evolution of the Central Antarctic Plate (SPICECAP) |
These aerogeophysical data were collected during the seventh ICECAP field season in 2015-16, and interpreted as part of the SPICECAP project. They consist of 7 survey flights using a BT-67 Basler and the ICECAP aergeophysical suite. The flights were based out of Australia's Casey Station and France/Italy's Concordia Station in East Antarctica, as part of a focused survey of the 'Little Dome C', a region with a suspected 1.5 Ma ice core record. The Level 2 data here consist of ice thickness, bed elevation and surface and bed reflectivity data, bed specularity content data, unleveled magnetic anomaly data, unleveled gravity anomaly data, and laser altimetry. Formats are self documented text files parallel those used by ICECAP (found in the Operation IceBridge archive at the National Snow and Ice Data Center), GIMBLE (found at USAP-DC), EAGLE-ICECAPII (found at the Australian Antarctic Data Center) and David Glacier (found on Zenodo.org), with summary maps of included data in PNG format. | ["POLYGON((110 -68,113 -68,116 -68,119 -68,122 -68,125 -68,128 -68,131 -68,134 -68,137 -68,140 -68,140 -68.7,140 -69.4,140 -70.1,140 -70.8,140 -71.5,140 -72.2,140 -72.9,140 -73.6,140 -74.3,140 -75,137 -75,134 -75,131 -75,128 -75,125 -75,122 -75,119 -75,116 -75,113 -75,110 -75,110 -74.3,110 -73.6,110 -72.9,110 -72.2,110 -71.5,110 -70.8,110 -70.1,110 -69.4,110 -68.7,110 -68))"] |
|
Ohio Range Subglacial rock core cosmogenic nuclide data
|
1341658 |
2020-06-28 | Mukhopadhyay, Sujoy |
Constraining Plio-Pleistocene West Antarctic Ice Sheet Behavior from the Ohio Range and Scott Glacier |
The data set consists of cosmogenic berrylium-10 and aluminum-26, along with neon-21, in a set of 4 rock-cores obtained from the Ohio Range, West Antarctica. The rock cores were obtained using the WInkie drill. The depth to the cores varies from 12 meters to 28 meters. The recovered rock cores analyzed for the cosmogenic isotopes varies from 22 cm long to 50 cm long. The data include the following formation: sample details, cosmogenic berrylium-10, aluminum-26 and upper bounds for cosmogenic 21 (since samples have nucleogenic 21) and the step heating data for neon. The data are in Mircrosoft excel format. | ["POLYGON((-116.46 -84.78,-116.452 -84.78,-116.444 -84.78,-116.436 -84.78,-116.428 -84.78,-116.42 -84.78,-116.412 -84.78,-116.404 -84.78,-116.396 -84.78,-116.388 -84.78,-116.38 -84.78,-116.38 -84.781,-116.38 -84.782,-116.38 -84.783,-116.38 -84.784,-116.38 -84.785,-116.38 -84.786,-116.38 -84.787,-116.38 -84.788,-116.38 -84.789,-116.38 -84.79,-116.388 -84.79,-116.396 -84.79,-116.404 -84.79,-116.412 -84.79,-116.42 -84.79,-116.428 -84.79,-116.436 -84.79,-116.444 -84.79,-116.452 -84.79,-116.46 -84.79,-116.46 -84.789,-116.46 -84.788,-116.46 -84.787,-116.46 -84.786,-116.46 -84.785,-116.46 -84.784,-116.46 -84.783,-116.46 -84.782,-116.46 -84.781,-116.46 -84.78))"] |
|
Processed CTD Data from the Larsen Ice Shelf in Antarctica acquired during the Nathaniel B. Palmer expedition NBP1001
|
0732467 0732651 |
2020-06-25 | Huber, Bruce; Gordon, Arnold |
Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach - Marine and Quaternary Geosciences Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans |
This data set was acquired with a Sea-Bird SBE 9Plus CTD during Nathaniel B. Palmer expedition NBP1001 conducted in 2010 (Chief Scientist: Dr. Eugene Domack; Investigator(s): Dr. Bruce Huber and Dr. Arnold Gordon). These data files are of Matlab Binary format and include Temperature, Current Measurement, and Salinity data and were processed after data collection. Data were acquired as part of the project(s): Collaborative Research in IPY: Abrupt Environmental Change in the LARsen Ice Shelf System, Antarctica (LARISSA), and funding was provided by NSF grant(s): ANT07-32467. | ["POLYGON((-68 -60,-66.7 -60,-65.4 -60,-64.1 -60,-62.8 -60,-61.5 -60,-60.2 -60,-58.9 -60,-57.6 -60,-56.3 -60,-55 -60,-55 -60.6,-55 -61.2,-55 -61.8,-55 -62.4,-55 -63,-55 -63.6,-55 -64.2,-55 -64.8,-55 -65.4,-55 -66,-56.3 -66,-57.6 -66,-58.9 -66,-60.2 -66,-61.5 -66,-62.8 -66,-64.1 -66,-65.4 -66,-66.7 -66,-68 -66,-68 -65.4,-68 -64.8,-68 -64.2,-68 -63.6,-68 -63,-68 -62.4,-68 -61.8,-68 -61.2,-68 -60.6,-68 -60))"] |
|
Processed ship-based LADCP Sonar Data from the Larsen Ice Shelf in Antarctica acquired during the Nathaniel B. Palmer expedition NBP1001
|
0732651 0732467 |
2020-06-25 | Huber, Bruce; Gordon, Arnold |
Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach - Marine and Quaternary Geosciences Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans |
This data set was acquired with a ship-based LDEO LADCP Sonar during Nathaniel B. Palmer expedition NBP1001 conducted in 2010 (Chief Scientist: Dr. Eugene Domack; Investigator(s): Dr. Bruce Huber and Dr. Arnold Gordon). These data files are of Matlab Binary format and include Current Measurement data and were processed after data collection. Data were acquired as part of the project(s): Collaborative Research in IPY: Abrupt Environmental Change in the LARsen Ice Shelf System, Antarctica (LARISSA), and funding was provided by NSF grant(s): ANT07-32467. | ["POLYGON((-68 -60,-66.7 -60,-65.4 -60,-64.1 -60,-62.8 -60,-61.5 -60,-60.2 -60,-58.9 -60,-57.6 -60,-56.3 -60,-55 -60,-55 -60.6,-55 -61.2,-55 -61.8,-55 -62.4,-55 -63,-55 -63.6,-55 -64.2,-55 -64.8,-55 -65.4,-55 -66,-56.3 -66,-57.6 -66,-58.9 -66,-60.2 -66,-61.5 -66,-62.8 -66,-64.1 -66,-65.4 -66,-66.7 -66,-68 -66,-68 -65.4,-68 -64.8,-68 -64.2,-68 -63.6,-68 -63,-68 -62.4,-68 -61.8,-68 -61.2,-68 -60.6,-68 -60))"] |
|
Processed Temperature, Salinity, and Current Measurement Data from the Amundsen Sea acquired during the Nathaniel B. Palmer expedition NBP0901
|
0632282 |
2020-06-25 | Huber, Bruce; Jacobs, Stanley |
IPY/ASEP - Collaborative International Research: Amundsen Sea Influence on West Antarctic Ice Sheet Stability and Sea Level Rise. |
This data set was derived from data acquired during Nathaniel B. Palmer expedition NBP0901 conducted in 2009 (Chief Scientist: Dr. Stan Jacobs; Investigator(s): Dr. Stan Jacobs and Dr. Bruce Huber). These data files are of Matlab Binary format and include Current Measurement, Salinity, and Temperature data and were processed after data collection. Data were acquired as part of the project(s): Collaborative International Research: Amundsen Sea Influence on West Antarctic Ice Sheet Stability and Sea Level Rise, Shedding dynamic light on iron limitation: The interplay of iron limitation and dynamic irradiance conditions in governing the phytoplankton distribution in the Ross Sea, and Collaborative Research: Sampling the ocean - sea ice interaction in the Pacific center of the Antarctic Dipole, and funding was provided by NSF grant(s): OPP06-32282. | ["POLYGON((-130 -64,-126.5 -64,-123 -64,-119.5 -64,-116 -64,-112.5 -64,-109 -64,-105.5 -64,-102 -64,-98.5 -64,-95 -64,-95 -65.15,-95 -66.3,-95 -67.45,-95 -68.6,-95 -69.75,-95 -70.9,-95 -72.05,-95 -73.2,-95 -74.35,-95 -75.5,-98.5 -75.5,-102 -75.5,-105.5 -75.5,-109 -75.5,-112.5 -75.5,-116 -75.5,-119.5 -75.5,-123 -75.5,-126.5 -75.5,-130 -75.5,-130 -74.35,-130 -73.2,-130 -72.05,-130 -70.9,-130 -69.75,-130 -68.6,-130 -67.45,-130 -66.3,-130 -65.15,-130 -64))"] |
|
Current Meter Data from the Ross Sea acquired with a Mooring deployed in December 2005 and recovered during the Nathaniel B. Palmer expedition NBP0601A (2006)
|
0087401 |
2020-06-25 | Asper, Vernon; Smith, Walker |
Interannual Variability in the Antarctic-Ross Sea (IVARS): Nutrients and Seasonal Production |
This data set was acquired with a InterOcean S4 Current Meter deployed on moorings in the Ross Sea from December 2005 through February 2006. Moorings were were retrieved during Nathaniel B. Palmer expedition NBP0601A conducted in 2006 (Chief Scientist: Dr. Walker Smith; Investigator(s): Dr. Vernon Asper). These data files are of Text File (ASCII) format and include Current Measurement data that have not been processed. Data were acquired as part of the project(s): Interannual variability in the Antarctic - Ross Sea (IVARS): Nutrients | ["POLYGON((-179.999 -77,-179.1991 -77,-178.3992 -77,-177.5993 -77,-176.7994 -77,-175.9995 -77,-175.1996 -77,-174.3997 -77,-173.5998 -77,-172.7999 -77,-172 -77,-172 -77.07,-172 -77.14,-172 -77.21,-172 -77.28,-172 -77.35,-172 -77.42,-172 -77.49,-172 -77.56,-172 -77.63,-172 -77.7,-172.7999 -77.7,-173.5998 -77.7,-174.3997 -77.7,-175.1996 -77.7,-175.9995 -77.7,-176.7994 -77.7,-177.5993 -77.7,-178.3992 -77.7,-179.1991 -77.7,-179.999 -77.7,-179.999 -77.63,-179.999 -77.56,-179.999 -77.49,-179.999 -77.42,-179.999 -77.35,-179.999 -77.28,-179.999 -77.21,-179.999 -77.14,-179.999 -77.07,-179.999 -77))"] |
|
Calibrated Hydrographic Data acquired with a LADCP from the Amundsen Sea acquired during the Nathaniel B. Palmer expedition NBP0901
|
0632282 |
2020-06-25 | Thurnherr, Andreas |
IPY/ASEP - Collaborative International Research: Amundsen Sea Influence on West Antarctic Ice Sheet Stability and Sea Level Rise. |
This data set was acquired with a LDEO LADCP Sonar during Nathaniel B. Palmer expedition NBP0901 conducted in 2009 (Chief Scientist: Dr. Stan Jacobs; Investigator(s): Dr. Andreas Thurnherr). These data files are of ASCII format and include Current Measurement data and were processed after data collection. Data were acquired as part of the project(s): Collaborative International Research: Amundsen Sea Influence on West Antarctic Ice Sheet Stability and Sea Level Rise, Shedding dynamic light on iron limitation: The interplay of iron limitation and dynamic irradiance conditions in governing the phytoplankton distribution in the Ross Sea, and Collaborative Research: Sampling the ocean - sea ice interaction in the Pacific center of the Antarctic Dipole, and funding was provided by NSF grant(s): OPP06-32282. | ["POLYGON((-130 -66,-127 -66,-124 -66,-121 -66,-118 -66,-115 -66,-112 -66,-109 -66,-106 -66,-103 -66,-100 -66,-100 -66.95,-100 -67.9,-100 -68.85,-100 -69.8,-100 -70.75,-100 -71.7,-100 -72.65,-100 -73.6,-100 -74.55,-100 -75.5,-103 -75.5,-106 -75.5,-109 -75.5,-112 -75.5,-115 -75.5,-118 -75.5,-121 -75.5,-124 -75.5,-127 -75.5,-130 -75.5,-130 -74.55,-130 -73.6,-130 -72.65,-130 -71.7,-130 -70.75,-130 -69.8,-130 -68.85,-130 -67.9,-130 -66.95,-130 -66))"] |
|
Processed CTD Data from the Larsen Ice Shelf near Antarctica acquired during the Nathaniel B. Palmer expedition NBP1203
|
0732651 1141890 |
2020-06-25 | Huber, Bruce; Gordon, Arnold |
Cape Adare Long Term Moorings (CALM): Analysis Phase Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans |
This data set was acquired with a Sea-Bird SBE 9Plus CTD during Nathaniel B. Palmer expedition NBP1203 conducted in 2012 (Chief Scientist: Dr. Maria Vernet; Investigator(s): Dr. Bruce Huber and Dr. Arnold Gordon). These data files are of Matlab Binary format and include Current Measurement, Salinity, and Temperature data and were processed after data collection. Funding was provided by NSF grant(s): ANT11-41890. | ["POLYGON((-63 -60,-62.2 -60,-61.4 -60,-60.6 -60,-59.8 -60,-59 -60,-58.2 -60,-57.4 -60,-56.6 -60,-55.8 -60,-55 -60,-55 -60.5,-55 -61,-55 -61.5,-55 -62,-55 -62.5,-55 -63,-55 -63.5,-55 -64,-55 -64.5,-55 -65,-55.8 -65,-56.6 -65,-57.4 -65,-58.2 -65,-59 -65,-59.8 -65,-60.6 -65,-61.4 -65,-62.2 -65,-63 -65,-63 -64.5,-63 -64,-63 -63.5,-63 -63,-63 -62.5,-63 -62,-63 -61.5,-63 -61,-63 -60.5,-63 -60))"] |
|
Processed ship-based LADCP Sonar Data from the Larsen Ice Shelf near Antarctica acquired during the Nathaniel B. Palmer expedition NBP1203
|
0732651 1141890 |
2020-06-25 | Huber, Bruce; Gordon, Arnold |
Cape Adare Long Term Moorings (CALM): Analysis Phase Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans |
This data set was acquired with a ship-based LDEO LADCP Sonar during Nathaniel B. Palmer expedition NBP1203 conducted in 2012 (Chief Scientist: Dr. Maria Vernet; Investigator(s): Dr. Bruce Huber and Dr. Arnold Gordon). These data files are of Matlab Binary format and include Current Measurement data and were processed after data collection. Funding was provided by NSF grant(s): ANT11-41890. | ["POLYGON((-62 -61,-61.3 -61,-60.6 -61,-59.9 -61,-59.2 -61,-58.5 -61,-57.8 -61,-57.1 -61,-56.4 -61,-55.7 -61,-55 -61,-55 -61.44,-55 -61.88,-55 -62.32,-55 -62.76,-55 -63.2,-55 -63.64,-55 -64.08,-55 -64.52,-55 -64.96,-55 -65.4,-55.7 -65.4,-56.4 -65.4,-57.1 -65.4,-57.8 -65.4,-58.5 -65.4,-59.2 -65.4,-59.9 -65.4,-60.6 -65.4,-61.3 -65.4,-62 -65.4,-62 -64.96,-62 -64.52,-62 -64.08,-62 -63.64,-62 -63.2,-62 -62.76,-62 -62.32,-62 -61.88,-62 -61.44,-62 -61))"] |
|
Processed Fluid Chemistry Data from the Ross Sea acquired during the Nathaniel B. Palmer expedition NBP0601
|
0338097 0338157 |
2020-06-25 | DiTullio, Giacomo; Smith, Walker |
Collaborative Research: Interactive Effects of Iron, Light and Carbon Dioxide on Phytoplankton Community Dynamics in the Ross Sea |
This data set was acquired with a Niskin Bottle Fluid Sampler during Nathaniel B. Palmer expedition NBP0601 conducted in 2005 (Chief Scientist: Dr. Giacomo DiTullio). The data files are in XLS format and include Fluid Chemistry data that have been processed. The data was acquired as part of the project called Interaction of iron, light and CO2 on phytoplankton community dynamics in the Ross Sea. Funding was provided by NSF grants: ANT03-38097, ANT03-38157, ANT03-38164, and ANT03-38350. | ["POLYGON((-180 -76,-179.7 -76,-179.4 -76,-179.1 -76,-178.8 -76,-178.5 -76,-178.2 -76,-177.9 -76,-177.6 -76,-177.3 -76,-177 -76,-177 -76.2,-177 -76.4,-177 -76.6,-177 -76.8,-177 -77,-177 -77.2,-177 -77.4,-177 -77.6,-177 -77.8,-177 -78,-177.3 -78,-177.6 -78,-177.9 -78,-178.2 -78,-178.5 -78,-178.8 -78,-179.1 -78,-179.4 -78,-179.7 -78,180 -78,178.5 -78,177 -78,175.5 -78,174 -78,172.5 -78,171 -78,169.5 -78,168 -78,166.5 -78,165 -78,165 -77.8,165 -77.6,165 -77.4,165 -77.2,165 -77,165 -76.8,165 -76.6,165 -76.4,165 -76.2,165 -76,166.5 -76,168 -76,169.5 -76,171 -76,172.5 -76,174 -76,175.5 -76,177 -76,178.5 -76,-180 -76))"] |
|
Processed Fluid Chemistry Data from the Ross Sea acquired during the Nathaniel B. Palmer expedition NBP0601A
|
0087401 |
2020-06-25 | Asper, Vernon; Smith, Walker |
Interannual Variability in the Antarctic-Ross Sea (IVARS): Nutrients and Seasonal Production |
This data set was acquired with a Niskin Bottle Fluid Sampler during Nathaniel B. Palmer expedition NBP0601A conducted in 2006 (Chief Scientist: Dr. Walker Smith). The data files are in XLS format and include Fluid Chemistry data that has not been processed. The data was acquired as part of the project called Interannual Variability in the Antarctic - Ross Sea (IVARS): Nutrients. | ["POLYGON((-180 -76,-179.6 -76,-179.2 -76,-178.8 -76,-178.4 -76,-178 -76,-177.6 -76,-177.2 -76,-176.8 -76,-176.4 -76,-176 -76,-176 -76.2,-176 -76.4,-176 -76.6,-176 -76.8,-176 -77,-176 -77.2,-176 -77.4,-176 -77.6,-176 -77.8,-176 -78,-176.4 -78,-176.8 -78,-177.2 -78,-177.6 -78,-178 -78,-178.4 -78,-178.8 -78,-179.2 -78,-179.6 -78,180 -78,178.5 -78,177 -78,175.5 -78,174 -78,172.5 -78,171 -78,169.5 -78,168 -78,166.5 -78,165 -78,165 -77.8,165 -77.6,165 -77.4,165 -77.2,165 -77,165 -76.8,165 -76.6,165 -76.4,165 -76.2,165 -76,166.5 -76,168 -76,169.5 -76,171 -76,172.5 -76,174 -76,175.5 -76,177 -76,178.5 -76,-180 -76))"] |
|
Processed ADCP Sonar and CTD Data from the Maud Rise acquired during the Nathaniel B. Palmer expedition NBP0506
|
0337159 |
2020-06-25 | McPhee, Miles G. |
Collaborative Research: The Maud Rise Nonlinear Equation of State Study (MaudNESS) |
This data set was acquired with a ADCP Sonar and CTD during Nathaniel B. Palmer expedition NBP0506 conducted in 2005 (Chief Scientist: Dr. Miles McPhee). These data files are of MATLAB format and include Turbulence, Salinity, and Temperature data that have not been processed. Data were acquired as part of the project(s): Maud rise Non-linear Equation of State Study, and funding was provided by NSF grant(s): ANT03-37159. | ["POLYGON((-2 -62,-1 -62,0 -62,1 -62,2 -62,3 -62,4 -62,5 -62,6 -62,7 -62,8 -62,8 -62.42,8 -62.84,8 -63.26,8 -63.68,8 -64.1,8 -64.52,8 -64.94,8 -65.36,8 -65.78,8 -66.2,7 -66.2,6 -66.2,5 -66.2,4 -66.2,3 -66.2,2 -66.2,1 -66.2,0 -66.2,-1 -66.2,-2 -66.2,-2 -65.78,-2 -65.36,-2 -64.94,-2 -64.52,-2 -64.1,-2 -63.68,-2 -63.26,-2 -62.84,-2 -62.42,-2 -62))"] |
|
Processed CurrentMeter Data from the Adare Basin near Antarctica acquired during the Nathaniel B. Palmer expedition NBP1101
|
0839039 0538148 |
2020-06-25 | Huber, Bruce; Gordon, Arnold |
Cape Adare Long-term Mooring (CALM) Collaborate Research:Modified Circumpolar Deep Water Intrusions as an Iron Source to the Summer Ross Sea Ecosystem |
This data set was acquired with a CurrentMeter during Nathaniel B. Palmer expedition NBP1101 conducted in 2011 (Chief Scientist: Dr. Josh Kohut; Investigator(s): Dr. Bruce Huber and Dr. Arnold Gordon). These data files are of Matlab Binary format and include Temperature, Current Measurement, and Salinity data and were processed after data collection. Data were acquired as part of the project(s): Ross Sea Expedition, and funding was provided by NSF grant(s): ANT08-39039. | ["POLYGON((172 -71,172.1 -71,172.2 -71,172.3 -71,172.4 -71,172.5 -71,172.6 -71,172.7 -71,172.8 -71,172.9 -71,173 -71,173 -71.1,173 -71.2,173 -71.3,173 -71.4,173 -71.5,173 -71.6,173 -71.7,173 -71.8,173 -71.9,173 -72,172.9 -72,172.8 -72,172.7 -72,172.6 -72,172.5 -72,172.4 -72,172.3 -72,172.2 -72,172.1 -72,172 -72,172 -71.9,172 -71.8,172 -71.7,172 -71.6,172 -71.5,172 -71.4,172 -71.3,172 -71.2,172 -71.1,172 -71))"] |
|
Processed CurrentMeter Data from the Ross Sea near Antarctica acquired during the Nathaniel B. Palmer expedition NBP0801
|
0542456 0538148 |
2020-06-25 | Huber, Bruce; Gordon, Arnold |
Cape Adare Long-term Mooring (CALM) Collaborative Research: Do Crustacean Zooplankton Play a Pivotal Role in Structuring Heterotrophic Plankton Communities in the Ross Sea? |
This data set was acquired with a CurrentMeter during Nathaniel B. Palmer expedition NBP0801 conducted in 2008 (Chief Scientist: Dr. David Caron; Investigator(s): Dr. Bruce Huber and Dr. Arnold Gordon). These data files are of Matlab Binary format and include Current Measurement, Salinity, and Temperature data and were processed after data collection. Data were acquired as part of the project(s): Cape Adare Long-term Mooring (CALM) and Collaborative Research:Do crustacean zooplankton play a pivotal role in structuring heterotrophic plankton communities., and funding was provided by NSF grant(s): ANT05-38148 and ANT05-42456. | ["POLYGON((169 -70.5,169.4 -70.5,169.8 -70.5,170.2 -70.5,170.6 -70.5,171 -70.5,171.4 -70.5,171.8 -70.5,172.2 -70.5,172.6 -70.5,173 -70.5,173 -70.65,173 -70.8,173 -70.95,173 -71.1,173 -71.25,173 -71.4,173 -71.55,173 -71.7,173 -71.85,173 -72,172.6 -72,172.2 -72,171.8 -72,171.4 -72,171 -72,170.6 -72,170.2 -72,169.8 -72,169.4 -72,169 -72,169 -71.85,169 -71.7,169 -71.55,169 -71.4,169 -71.25,169 -71.1,169 -70.95,169 -70.8,169 -70.65,169 -70.5))"] |
|
Seasonal Dive Data
|
1246463 |
2020-06-23 | Burns, Jennifer |
The Cost of A New Fur Coat: Interactions between Molt and Reproduction in Weddell Seals |
For Figures 2 and 4 In Beltran et al. PNAS | ["POINT(165 -77)"] |
|
WAIS Divide Ice Core Marine Isotope Stage 3 CO2 record
|
1246465 |
2020-06-22 | Brook, Edward J. |
Completing the WAIS Divide Ice Core CO2 record |
CO2 concentrations in trapped air from the WAIS Divide ice core for Marine Isotope Stage 3 (age range for data 23-67 ka). Methods described in Marcott et al. (2014; Nature, 515, 616-619) and Ahn et al. (2009; Journal of Glaciology, 55, 499-506). | ["POINT(-112.1115 -79.481)"] |
|
Radioisotope data (C-14 and Pb-210) from bulk sediments, Larsen A Ice Shelf
|
0732711 1341669 |
2020-06-19 | Taylor, Richard; DeMaster, Dave |
Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans Using Radiochemical Data from Collapsed Ice Shelf Sediments to Understand the Nature and Timing of the Benthic Response to High-Latitude Climate Change |
This file contains Pb-210 data from bulk sediments beneath the collapsed Larsen A Ice Shelf and C-14 data from the organic fraction of the same samples. | ["POLYGON((-61 -64,-60.5 -64,-60 -64,-59.5 -64,-59 -64,-58.5 -64,-58 -64,-57.5 -64,-57 -64,-56.5 -64,-56 -64,-56 -64.1,-56 -64.2,-56 -64.3,-56 -64.4,-56 -64.5,-56 -64.6,-56 -64.7,-56 -64.8,-56 -64.9,-56 -65,-56.5 -65,-57 -65,-57.5 -65,-58 -65,-58.5 -65,-59 -65,-59.5 -65,-60 -65,-60.5 -65,-61 -65,-61 -64.9,-61 -64.8,-61 -64.7,-61 -64.6,-61 -64.5,-61 -64.4,-61 -64.3,-61 -64.2,-61 -64.1,-61 -64))"] |
|
Fluorometer Data acquired on Moorings deployed the Ross Sea and recovered during the Nathaniel B. Palmer expedition NBP0601A (2006)
|
0087401 |
2020-06-17 | Asper, Vernon; Smith, Walker |
Interannual Variability in the Antarctic-Ross Sea (IVARS): Nutrients and Seasonal Production |
This data set was acquired with a Turner Designs 10-AU-005 Fluorometer and WET Labs FLSB Fluorometer on moorings deployed in the Ross Sea in December 2005. Moorings were retrieved during Nathaniel B. Palmer expedition NBP0601A conducted in 2006 (Chief Scientist: Dr. Walker Smith; Investigator(s): Dr. Vernon Asper). These data files are of ASCII format and include Fluorescence data. Data were acquired as part of the project(s): Interannual variability in the Antarctic - Ross Sea (IVARS): Nutrients, and funding was provided by NSF grant(s): ANT00-87401. | ["POLYGON((-179.999 -77,-179.1991 -77,-178.3992 -77,-177.5993 -77,-176.7994 -77,-175.9995 -77,-175.1996 -77,-174.3997 -77,-173.5998 -77,-172.7999 -77,-172 -77,-172 -77.07,-172 -77.14,-172 -77.21,-172 -77.28,-172 -77.35,-172 -77.42,-172 -77.49,-172 -77.56,-172 -77.63,-172 -77.7,-172.7999 -77.7,-173.5998 -77.7,-174.3997 -77.7,-175.1996 -77.7,-175.9995 -77.7,-176.7994 -77.7,-177.5993 -77.7,-178.3992 -77.7,-179.1991 -77.7,-179.999 -77.7,-179.999 -77.63,-179.999 -77.56,-179.999 -77.49,-179.999 -77.42,-179.999 -77.35,-179.999 -77.28,-179.999 -77.21,-179.999 -77.14,-179.999 -77.07,-179.999 -77))"] |
|
H2 in South Pole firn air
|
1907974 |
2020-06-09 | Saltzman, Eric |
EAGER: Feasibility of Reconstructing the Atmospheric History of Molecular Hydrogen from Antarctic Ice |
This data set contains measurements of molecular hydrogen (H2) in firn air samples collected at South Pole in 2001. | ["POLYGON((129.26 -89.86,130.261 -89.86,131.262 -89.86,132.263 -89.86,133.264 -89.86,134.265 -89.86,135.266 -89.86,136.267 -89.86,137.268 -89.86,138.269 -89.86,139.27 -89.86,139.27 -89.861,139.27 -89.862,139.27 -89.863,139.27 -89.864,139.27 -89.865,139.27 -89.866,139.27 -89.867,139.27 -89.868,139.27 -89.869,139.27 -89.87,138.269 -89.87,137.268 -89.87,136.267 -89.87,135.266 -89.87,134.265 -89.87,133.264 -89.87,132.263 -89.87,131.262 -89.87,130.261 -89.87,129.26 -89.87,129.26 -89.869,129.26 -89.868,129.26 -89.867,129.26 -89.866,129.26 -89.865,129.26 -89.864,129.26 -89.863,129.26 -89.862,129.26 -89.861,129.26 -89.86))"] |
|
Latitude and longitude data for project study sites
|
1744584 1744570 1744550 1744602 |
2020-06-04 | Amsler, Charles |
Collaborative Research: Sea ice as a driver of Antarctic benthic macroalgal community composition and nearshore trophic connectivity |
This .cvs file contains the latitude and longitude, along with closest geographic names, for the 15 study sites visited by projects projects ANT-1744550, -1744570, -1744584, and -1744602 during ARSV Laurence M. Gould cruise LMG 19-04 in April and May 2019. | [] |
|
South Pole Ice Core Methane Data and Gas Age Time Scale
|
1643722 |
2020-06-03 | Brook, Edward J. |
A High Resolution Atmospheric Methane Record from the South Pole Ice Core |
This data set contains measurements of atmospheric methane in the South Pole Ice core made at both Oregon State University and Penn State University, as well as a gas age time scale for the core. In both laboratories methane was measured using a melt-refreeze technique to liberate extracted air and using a gas chromatograph with flame ionization detection to quantify the methane concentration, by comparison to calibrated air standards. To construct the gas time scale abrupt changes in atmospheric methane during the glacial period and centennial methane variability during the Holocene were used to synchronize the South Pole gas record with analogous data from the West Antarctic Ice Sheet Divide ice core. Stratigraphic matching based on visual optimization was verified using an automated matching algorithm. The South Pole ice core recovers all expected changes in methane based on previous records. In combination with an existing ice age scale (Winski et al., 2019, Clim. Past, 15, 1793–1808) an independent estimate of the gas age-ice age difference is also provided. A full description of the data and gas age scale are provided in a forthcoming paper (Epifanio et al, in review in Climate of the Past, Discussions). | ["POINT(180 -90)"] |
|
The rise and fall of an ancient Adelie penguin 'supercolony' at Cape Adare, Antarctica
|
1443386 |
2020-06-02 | McKenzie, Ashley; Patterson, William; Emslie, Steven |
Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators |
We report new discoveries and radiocarbon dates on active and abandoned Adélie penguin (Pygoscelis adeliae) colonies at Cape Adare, Antarctica. This colony, first established at approximately 2000 BP (calendar years before present, i.e. 1950), is currently the largest for this species with approximately 338 000 breeding pairs, most located on lowlying Ridley Beach. We hypothesize that this colony first formed after fast ice began blocking open-water access by breeding penguins to the Scott Coast in the southern Ross Sea during a cooling period also at approximately 2000 BP. Our results suggest that the new colony at Cape Adare continued to grow, expanding to a large upper terrace above Ridley Beach, until it exceeded approximately 500 000 breeding pairs (a 'supercolony') by approximately 1200 BP. The high marine productivity associated with the Ross Sea polynya and continental shelf break supported this growth, but the colony collapsed to its present size for unknown reasons after approximately 1200 BP. Ridley Beach will probably be abandoned in the near future due to rising sea level in this region. We predict that penguins will retreat to higher elevations at Cape Adare and that the Scott Coast will be reoccupied by breeding penguins as fast ice continues to dissipate earlier each summer, restoring open-water access to beaches there. | ["POLYGON((-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -60,-180 -61.130769444,-180 -62.261538888,-180 -63.392308332,-180 -64.523077776,-180 -65.65384722,-180 -66.784616664,-180 -67.915386108,-180 -69.046155552,-180 -70.176924996,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,-180 -71.30769444,180 -71.30769444,179.019305556 -71.30769444,178.038611112 -71.30769444,177.057916668 -71.30769444,176.077222224 -71.30769444,175.09652778 -71.30769444,174.115833336 -71.30769444,173.135138892 -71.30769444,172.154444448 -71.30769444,171.173750004 -71.30769444,170.19305556 -71.30769444,170.19305556 -70.176924996,170.19305556 -69.046155552,170.19305556 -67.915386108,170.19305556 -66.784616664,170.19305556 -65.65384722,170.19305556 -64.523077776,170.19305556 -63.392308332,170.19305556 -62.261538888,170.19305556 -61.130769444,170.19305556 -60,171.173750004 -60,172.154444448 -60,173.135138892 -60,174.115833336 -60,175.09652778 -60,176.077222224 -60,177.057916668 -60,178.038611112 -60,179.019305556 -60,-180 -60))"] |
|
Mid-Holocene high-resolution water isotope time series for the WAIS Divide ice core
|
1807522 |
2020-05-26 | Jones, Tyler R.; Morris , Valerie; Vaughn, Bruce; White, James |
Collaborative Research: Targeted resampling of deep polar ice cores using information theory |
The original water stable isotope data for the WAIS Divide Deep Ice Core was generated under the University of Colorado INSTAAR Stable Isotope Lab (NSF Award# 1443328). This data set contains high-resolution dD and d18O data for the West Antarctic Ice Sheet (WAIS) Divide Ice core. Drilling was initiated in 2006 and completed in 2011, and subsequent analyses on the ice were performed at the University of Colorado INSTAAR Stable Isotope Lab using Continuous Flow Analysis (CFA). The targeted resampling of the WAIS Divide Ice core (1035.4 - 1368.2m) occurred for this grant (NSF OPP - Antarctic Glaciology 1807522) to replace data analyzed on an older generation Laser Absorption Spectroscopy instrument. The resampling interval was identified using information theory. | ["POINT(-112.1115 -79.481)"] |
|
Shallow firn temperature records
|
None | 2020-05-20 | Goldthwait, Richard, P; Pirrit, John; Hollin, John; Giovineto, Mario | No project link provided | Shallow firn temperature records made at the Byrd, Ellesworth, Wilkes and South Pole sites during the International Geophysical Year (1957-58). Depths of measurements range from the surface to as deep as 16m, on intervals of 0.5m to 8m. Time intervals of measurements vary from one day to one month. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Compilation of ice temperature measurements at 10 m depth from international traverses 1957-1996.
|
None | 2020-05-20 | Scambos, Ted | No project link provided | Temperature mesaurements from 10-meter depth in drill holes, dating back prior to 1956 and the International Geophysical Year, including measurements from several major recent surveys. Data cover the entire continental ice sheet and several ice shelves, but coverage density is generally low. For more information, please see the notes available for each 10-meter data set, and the list of related publications. The deeper drill-hole temperature data collection also covers a large portion of the ice sheet. The time frame covered by this collection is 1949-1979. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
ApRES Firn Density Study
|
1142167 |
2020-05-15 | Pettit, Erin |
Collaborative Research: VeLveT Ice - eVoLution of Fabric and Texture in Ice at WAIS Divide, West Antarctica |
We tested the ability of phase sensitive radar (ApRES) to detect firn density profile towards developing a simpler, non destructive, faster method than firn coring. | ["POLYGON((-112.3 -79.2,-112.22 -79.2,-112.14 -79.2,-112.06 -79.2,-111.98 -79.2,-111.9 -79.2,-111.82 -79.2,-111.74 -79.2,-111.66 -79.2,-111.58 -79.2,-111.5 -79.2,-111.5 -79.23,-111.5 -79.26,-111.5 -79.29,-111.5 -79.32,-111.5 -79.35,-111.5 -79.38,-111.5 -79.41,-111.5 -79.44,-111.5 -79.47,-111.5 -79.5,-111.58 -79.5,-111.66 -79.5,-111.74 -79.5,-111.82 -79.5,-111.9 -79.5,-111.98 -79.5,-112.06 -79.5,-112.14 -79.5,-112.22 -79.5,-112.3 -79.5,-112.3 -79.47,-112.3 -79.44,-112.3 -79.41,-112.3 -79.38,-112.3 -79.35,-112.3 -79.32,-112.3 -79.29,-112.3 -79.26,-112.3 -79.23,-112.3 -79.2))"] |
|
ApRES Vertical Strain Study
|
1142167 |
2020-05-15 | Pettit, Erin |
Collaborative Research: VeLveT Ice - eVoLution of Fabric and Texture in Ice at WAIS Divide, West Antarctica |
We tested the ability of phase sensitive radar (ApRES) to detect vertical strain throughout the depth of an ice sheet 3400m thick. | ["POLYGON((-112.3 -79.2,-112.22 -79.2,-112.14 -79.2,-112.06 -79.2,-111.98 -79.2,-111.9 -79.2,-111.82 -79.2,-111.74 -79.2,-111.66 -79.2,-111.58 -79.2,-111.5 -79.2,-111.5 -79.23,-111.5 -79.26,-111.5 -79.29,-111.5 -79.32,-111.5 -79.35,-111.5 -79.38,-111.5 -79.41,-111.5 -79.44,-111.5 -79.47,-111.5 -79.5,-111.58 -79.5,-111.66 -79.5,-111.74 -79.5,-111.82 -79.5,-111.9 -79.5,-111.98 -79.5,-112.06 -79.5,-112.14 -79.5,-112.22 -79.5,-112.3 -79.5,-112.3 -79.47,-112.3 -79.44,-112.3 -79.41,-112.3 -79.38,-112.3 -79.35,-112.3 -79.32,-112.3 -79.29,-112.3 -79.26,-112.3 -79.23,-112.3 -79.2))"] |
|
Earthquake Sequence Dynamics at the Interface Between an Elastic Layer and Underlying Half-Space in Antiplane Shear
|
1542885 1656518 |
2020-05-11 | Abrahams, Lauren |
Collaborative Research: Characterizing Brittle Failure and Fracture Propagation in Fast Ice Sliding with Dynamic Rupture Models based on Whillans Ice Stream Seismic/Geodetic Data |
We quantify sliding stability and rupture styles for a horizontal interface between an elastic layer and stiffer elastic half-space with a free surface on top and rate-and-state friction on the interface. Specific motivation (and model parameters) comes from quasi-periodic slow slip events on the Whillans Ice Plain in West Antarctica. We quantify the influence of layer thickness on sliding stability, specifically whether steady loading of the system produces steady sliding or sequences of stick-slip events. This dataset contains input files from different parts of parameter space to demonstrate different styles of slip (steady sliding, slow slip sequences, and fast slip sequences). | [] |
|
J-9 Drill Hole Temperatures
|
None | 2020-05-05 | Clough, John | No project link provided | The Ross Ice Shelf Project (RISP) began in 1973, and lasted six field seasons. One of the primary goals for RISP was to drill a hole through the Ross Ice Shelf in order to study the ice, the ocean, and the ocean floor beneath the ice shelf. In late November 1974, during the second field season, the camp at J-9 (82.375S, 168.626W) was established, and this site was chosen for future deep core drilling. This datset records ice shelf and sub-ice shelf temperature profiles taken between 1974 and 1977 at the J9 drill site in The Ross Ice Shelf. | ["POINT(-168.626 -82.375)"] |
|
VELMAP
|
None | 2020-05-05 | Scambos, Ted | No project link provided | VELMAP is a compilation of ice velocity data of the Antarctic ice sheet and is intended for use by the polar scientific community. The data are presented in tabular form (ASCII format), containing latitude, longitude, speed, bearing, and error ranges. A metadata header describes the source of the data, the time of measurement, and gives details on measurement accuracy and precision. The data sets were contributed by several investigators, in most cases from already-published work. Both in situ and image-based methods are used. References for the data sets are included with the data tables. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
South Pole (SPICEcore) Borehole Deformation
|
1142167 |
2020-05-04 | Pettit, Erin |
Collaborative Research: VeLveT Ice - eVoLution of Fabric and Texture in Ice at WAIS Divide, West Antarctica |
Acoustic Televiewer measures borehole shape and tilt. These data were collected to study detailed borehole deformation with respect to ice properties to expand our understanding of the flow law for ice. | ["POINT(-180 -90)"] |
|
Raw satellite images from NB Palmer and LM Gould Antarctic cruises
|
None | 2020-05-04 | None | No project link provided | Raw Satellite Images acquired during several Nathaniel B. Palmer and LM Gould expeditions. These are mostly downloaded during the cruises, often directly using the ships satellite receiver (TerraSat system). The data include visible and infrared images. They are organized by expedition. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Macrofauna Species Abundance Raw Data from the Larsen Ice Shelf acquired during the Nathaniel B. Palmer expedition NBP1001
|
0732711 |
2020-05-01 | Smith, Craig |
Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans |
This Biology Species Abundance data set was acquired with a ship-based Camera during Nathaniel B. Palmer expedition NBP1001 conducted in 2010 (Chief Scientist: Dr. Eugene Domack; Investigator: Dr. Craig Smith). The data file is in XLS format and includes Biology Species Abundance Biology data that has not been processed. The data was acquired as part of the project called Collaborative Research in IPY: Abrupt Environmental Change in the LARsen Ice Shelf System, Antarctica (LARISSA). | ["POLYGON((-69 -61,-67.6 -61,-66.2 -61,-64.8 -61,-63.4 -61,-62 -61,-60.6 -61,-59.2 -61,-57.8 -61,-56.4 -61,-55 -61,-55 -61.68,-55 -62.36,-55 -63.04,-55 -63.72,-55 -64.4,-55 -65.08,-55 -65.76,-55 -66.44,-55 -67.12,-55 -67.8,-56.4 -67.8,-57.8 -67.8,-59.2 -67.8,-60.6 -67.8,-62 -67.8,-63.4 -67.8,-64.8 -67.8,-66.2 -67.8,-67.6 -67.8,-69 -67.8,-69 -67.12,-69 -66.44,-69 -65.76,-69 -65.08,-69 -64.4,-69 -63.72,-69 -63.04,-69 -62.36,-69 -61.68,-69 -61))"] |
|
Quantitative Diatom Assemblage Data from Iceberg Alley, Mac. Robertson Shelf, East Antarctica acquired during expedition NBP0101
|
9909367 |
2020-05-01 | Leventer, Amy |
Quaternary Glacial History and Paleoenvironments of the East Antarctic Margin |
This data set was acquired with a Jumbo Piston Core Sediment Sampler during R/V Nathaniel B. Palmer expedition NBP0101 conducted in 2001. This data file is of Microsoft Excel format and includes Quantitative Diatom Assemblage data; counts completed on randomly settled slides (Scherer, R.P., 1994. A new method for the determination of absolute abundance of diatoms and other silt-sized sedimentary particles. Journal of Paleolimnology, 12 (1), 171-178, doi:10.1007/BF00678093). These counts were completed at closely spaced intervals in NBP0101 JPC41, a jumbo piston core from Iceberg Alley, Mac.Robertson Shelf, East Antarctica | ["POINT(62.99 -67.13)"] |
|
Eddy covariance air-sea momentum, heat, and carbon dioxide fluxes in the Southern Ocean from the N.B. Palmer cruise NBP1402
|
1043623 |
2020-05-01 | Miller, Scott; Butterworth, Brian |
Air-Sea Fluxes of Momentum, Heat, and Carbon Dioxide at High Wind Speeds in the Southern Ocean |
This dataset contains meteorological and air-sea flux data (momentum, heat, and CO2 fluxes; CO2 gas transfer velocity) collected during the the Nathaniel B. Palmer expedition NBP1402 conducted in 2014. The files are of XLS format. | ["POLYGON((117.5 -47,120.35 -47,123.2 -47,126.05 -47,128.9 -47,131.75 -47,134.6 -47,137.45 -47,140.3 -47,143.15 -47,146 -47,146 -49.04,146 -51.08,146 -53.12,146 -55.16,146 -57.2,146 -59.24,146 -61.28,146 -63.32,146 -65.36,146 -67.4,143.15 -67.4,140.3 -67.4,137.45 -67.4,134.6 -67.4,131.75 -67.4,128.9 -67.4,126.05 -67.4,123.2 -67.4,120.35 -67.4,117.5 -67.4,117.5 -65.36,117.5 -63.32,117.5 -61.28,117.5 -59.24,117.5 -57.2,117.5 -55.16,117.5 -53.12,117.5 -51.08,117.5 -49.04,117.5 -47))"] |
|
Megafauna Species Abundance Raw Data from the Larsen Ice Shelf acquired during the Nathaniel B. Palmer expedition NBP1001
|
0732711 |
2020-05-01 | Smith, Craig |
Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans |
This Biology Species Abundance data set was acquired with a ship-based Camera during Nathaniel B. Palmer expedition NBP1001 conducted in 2010 (Chief Scientist: Dr. Eugene Domack; Investigator: Dr. Craig Smith). The data file is in XLS format and includes Biology Species Abundance Biology data that has not been processed. The data was acquired as part of the project called Collaborative Research in IPY: Abrupt Environmental Change in the LARsen Ice Shelf System, Antarctica (LARISSA). | ["POLYGON((-69 -61,-67.6 -61,-66.2 -61,-64.8 -61,-63.4 -61,-62 -61,-60.6 -61,-59.2 -61,-57.8 -61,-56.4 -61,-55 -61,-55 -61.68,-55 -62.36,-55 -63.04,-55 -63.72,-55 -64.4,-55 -65.08,-55 -65.76,-55 -66.44,-55 -67.12,-55 -67.8,-56.4 -67.8,-57.8 -67.8,-59.2 -67.8,-60.6 -67.8,-62 -67.8,-63.4 -67.8,-64.8 -67.8,-66.2 -67.8,-67.6 -67.8,-69 -67.8,-69 -67.12,-69 -66.44,-69 -65.76,-69 -65.08,-69 -64.4,-69 -63.72,-69 -63.04,-69 -62.36,-69 -61.68,-69 -61))"] |
|
Near-bottom Videos from the Southern Ocean acquired during R/V Nathaniel B. Palmer expedition NBP1402
|
1143836 |
2020-05-01 | Leventer, Amy; Post, Alexandra; Blankenship, Donald D.; Domack, Eugene Walter; Gulick, Sean; Huber, Bruce; Orsi, Alejandro; Shevenell, Amelia |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
This Biology Species Abundance data set was acquired with a ship-based Camera during Nathaniel B. Palmer expedition NBP1001 conducted in 2010 (Chief Scientist: Dr. Eugene Domack; Investigator: Dr. Craig Smith). The data file is in XLS format and includes Biology Species Abundance Biology data that has not been processed. The data was acquired as part of the project called Collaborative Research in IPY: Abrupt Environmental Change in the LARsen Ice Shelf System, Antarctica (LARISSA). | ["POLYGON((118 -65.5,118.3 -65.5,118.6 -65.5,118.9 -65.5,119.2 -65.5,119.5 -65.5,119.8 -65.5,120.1 -65.5,120.4 -65.5,120.7 -65.5,121 -65.5,121 -65.65,121 -65.8,121 -65.95,121 -66.1,121 -66.25,121 -66.4,121 -66.55,121 -66.7,121 -66.85,121 -67,120.7 -67,120.4 -67,120.1 -67,119.8 -67,119.5 -67,119.2 -67,118.9 -67,118.6 -67,118.3 -67,118 -67,118 -66.85,118 -66.7,118 -66.55,118 -66.4,118 -66.25,118 -66.1,118 -65.95,118 -65.8,118 -65.65,118 -65.5))"] |
|
Species Abundance Data from the Larsen Ice Shelf Ice acquired during R/V Nathaniel B. Palmer expedition NBP1203
|
0732711 1341669 |
2020-05-01 | Smith, Craig |
Using Radiochemical Data from Collapsed Ice Shelf Sediments to Understand the Nature and Timing of the Benthic Response to High-Latitude Climate Change Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach - Marine Ecosystems. |
Species Abundance Data from the Larsen Ice Shelf Ice acquired during R/V Nathaniel B. Palmer expedition NBP1203. Data were acquired as part of the project(s): Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach - Marine Ecosystems (LARISSA); and Using Radiochemical Data from Collapsed Ice Shelf Sediments to Understand the Nature and Timing of the Benthic Response to High-Latitude Climate Change. | ["POLYGON((-61 -62,-60.4 -62,-59.8 -62,-59.2 -62,-58.6 -62,-58 -62,-57.4 -62,-56.8 -62,-56.2 -62,-55.6 -62,-55 -62,-55 -62.34,-55 -62.68,-55 -63.02,-55 -63.36,-55 -63.7,-55 -64.04,-55 -64.38,-55 -64.72,-55 -65.06,-55 -65.4,-55.6 -65.4,-56.2 -65.4,-56.8 -65.4,-57.4 -65.4,-58 -65.4,-58.6 -65.4,-59.2 -65.4,-59.8 -65.4,-60.4 -65.4,-61 -65.4,-61 -65.06,-61 -64.72,-61 -64.38,-61 -64.04,-61 -63.7,-61 -63.36,-61 -63.02,-61 -62.68,-61 -62.34,-61 -62))"] |
|
Processed Camera Images acquired during the Laurence M. Gould expedition LMG1311
|
1143981 |
2020-05-01 | Domack, Eugene Walter |
Continuation of the LARISSA Continuous GPS Network in View of Observed Dynamic Response to Antarctic Peninsula Ice Mass Balance and Required Geologic Constraints |
This data set was acquired with a camera during Laurence M. Gould expedition LMG1311 conducted in 2013. These data files are of JPEG format and include Photograph images that have not been processed | ["POLYGON((-66.5 -61.5,-65.85 -61.5,-65.2 -61.5,-64.55 -61.5,-63.9 -61.5,-63.25 -61.5,-62.6 -61.5,-61.95 -61.5,-61.3 -61.5,-60.65 -61.5,-60 -61.5,-60 -61.87,-60 -62.24,-60 -62.61,-60 -62.98,-60 -63.35,-60 -63.72,-60 -64.09,-60 -64.46,-60 -64.83,-60 -65.2,-60.65 -65.2,-61.3 -65.2,-61.95 -65.2,-62.6 -65.2,-63.25 -65.2,-63.9 -65.2,-64.55 -65.2,-65.2 -65.2,-65.85 -65.2,-66.5 -65.2,-66.5 -64.83,-66.5 -64.46,-66.5 -64.09,-66.5 -63.72,-66.5 -63.35,-66.5 -62.98,-66.5 -62.61,-66.5 -62.24,-66.5 -61.87,-66.5 -61.5))"] |
|
Bottom photos from the Southern Ocean acquired during R/V Nathaniel B. Palmer expedition NBP1402
|
1143836 |
2020-05-01 | Leventer, Amy; Post, Alexandra; Domack, Eugene Walter; Gulick, Sean; Huber, Bruce; Orsi, Alejandro; Shevenell, Amelia |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
This data set was acquired with a Nikon D80 Digital Camera on a towed Yoyo camera system during R/V Nathaniel B. Palmer expedition NBP1402 conducted in 2014. These data files are of JPEG Image format and include Photograph data that have not been processed. | ["POLYGON((118 -65.5,118.3 -65.5,118.6 -65.5,118.9 -65.5,119.2 -65.5,119.5 -65.5,119.8 -65.5,120.1 -65.5,120.4 -65.5,120.7 -65.5,121 -65.5,121 -65.65,121 -65.8,121 -65.95,121 -66.1,121 -66.25,121 -66.4,121 -66.55,121 -66.7,121 -66.85,121 -67,120.7 -67,120.4 -67,120.1 -67,119.8 -67,119.5 -67,119.2 -67,118.9 -67,118.6 -67,118.3 -67,118 -67,118 -66.85,118 -66.7,118 -66.55,118 -66.4,118 -66.25,118 -66.1,118 -65.95,118 -65.8,118 -65.65,118 -65.5))"] |
|
Species List, Species Abundance, and Sediment Geochemistry processed data acquired during Laurence M. Gould expedition LMG0802
|
0636773 0636806 |
2020-04-30 | Smith, Craig; DeMaster, David |
Collaborative Research: Benthic Faunal Feeding Dynamics on the Antarctic Shelf and the Effects of Global Climate Change on Bentho-Pelagic Coupling |
This data set was acquired with a Box Core Sediment Sampler, Digital Camera, and Sediment Core Sampler during Laurence M. Gould expedition LMG0802 conducted in 2008. The data files are in Microsoft Excel format and include Species List, Species Abundance, and Sediment Geochemistry data that was processed after collection. | ["POLYGON((-72 -59,-71 -59,-70 -59,-69 -59,-68 -59,-67 -59,-66 -59,-65 -59,-64 -59,-63 -59,-62 -59,-62 -59.95,-62 -60.9,-62 -61.85,-62 -62.8,-62 -63.75,-62 -64.7,-62 -65.65,-62 -66.6,-62 -67.55,-62 -68.5,-63 -68.5,-64 -68.5,-65 -68.5,-66 -68.5,-67 -68.5,-68 -68.5,-69 -68.5,-70 -68.5,-71 -68.5,-72 -68.5,-72 -67.55,-72 -66.6,-72 -65.65,-72 -64.7,-72 -63.75,-72 -62.8,-72 -61.85,-72 -60.9,-72 -59.95,-72 -59))"] |
|
SOAR-Lake Vostok Survey bed elevation data
|
9978236 9911617 |
2020-04-28 | Studinger, Michael S.; Bell, Robin |
Continuation of Activities for the Support Office for Aerogeophysical Research (SOAR) Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work |
Bedrock Elevation Data acquired during the SOAR Twin Otter expedition SOAR-LVS (2000) This data set was during SOAR Twin Otter expedition SOAR-LVS conducted in 2000 (Chief Scientist: Dr. Robin Bell; Investigator(s): Dr. Michael Studinger). These data files are of ASCII format and include Bedrock Elevation data and were processed after data collection. Data were acquired as part of the project(s): SOAR-Lake Vostok Survey (LVS) and Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work | ["POLYGON((101.5 -75.5,102.15 -75.5,102.8 -75.5,103.45 -75.5,104.1 -75.5,104.75 -75.5,105.4 -75.5,106.05 -75.5,106.7 -75.5,107.35 -75.5,108 -75.5,108 -75.85,108 -76.2,108 -76.55,108 -76.9,108 -77.25,108 -77.6,108 -77.95,108 -78.3,108 -78.65,108 -79,107.35 -79,106.7 -79,106.05 -79,105.4 -79,104.75 -79,104.1 -79,103.45 -79,102.8 -79,102.15 -79,101.5 -79,101.5 -78.65,101.5 -78.3,101.5 -77.95,101.5 -77.6,101.5 -77.25,101.5 -76.9,101.5 -76.55,101.5 -76.2,101.5 -75.85,101.5 -75.5))"] |
|
SOAR-Lake Vostok Survey surface elevation data
|
9911617 9978236 |
2020-04-28 | Studinger, Michael S.; Bell, Robin |
Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work
Continuation of Activities for the Support Office for Aerogeophysical Research (SOAR) |
Surface Elevation Data acquired during the SOAR Twin Otter expedition SOAR-LVS (2000) This data set was during SOAR Twin Otter expedition SOAR-LVS conducted in 2000 (Chief Scientist: Dr. Robin Bell; Investigator(s): Dr. Michael Studinger). These data files are of ASCII format and include Surface Elevation data and were processed after data collection. Data were acquired as part of the project(s): SOAR-Lake Vostok Survey (LVS) and Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work | ["POLYGON((101.5 -75.5,102.15 -75.5,102.8 -75.5,103.45 -75.5,104.1 -75.5,104.75 -75.5,105.4 -75.5,106.05 -75.5,106.7 -75.5,107.35 -75.5,108 -75.5,108 -75.85,108 -76.2,108 -76.55,108 -76.9,108 -77.25,108 -77.6,108 -77.95,108 -78.3,108 -78.65,108 -79,107.35 -79,106.7 -79,106.05 -79,105.4 -79,104.75 -79,104.1 -79,103.45 -79,102.8 -79,102.15 -79,101.5 -79,101.5 -78.65,101.5 -78.3,101.5 -77.95,101.5 -77.6,101.5 -77.25,101.5 -76.9,101.5 -76.55,101.5 -76.2,101.5 -75.85,101.5 -75.5))"] |
|
SOAR-Lake Vostok Survey ice thickness data
|
9978236 9911617 |
2020-04-28 | Studinger, Michael S.; Bell, Robin |
Continuation of Activities for the Support Office for Aerogeophysical Research (SOAR) Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work |
Processed IcePenetrating Radar Altimeter Data acquired during the SOAR Twin Otter expedition SOAR-LVS (2000) This data set was acquired with a IcePenetrating Radar Altimeter during SOAR Twin Otter expedition SOAR-LVS conducted in 2000 (Chief Scientist: Dr. Robin Bell; Investigator(s): Dr. Robin Bell and Dr. Michael Studinger). These data files are of ASCII format and include Ice LayerThickness data and were processed after data collection. Data were acquired as part of the project(s): SOAR-Lake Vostok Survey (LVS) and Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work | ["POLYGON((101.5 -75.5,102.15 -75.5,102.8 -75.5,103.45 -75.5,104.1 -75.5,104.75 -75.5,105.4 -75.5,106.05 -75.5,106.7 -75.5,107.35 -75.5,108 -75.5,108 -75.85,108 -76.2,108 -76.55,108 -76.9,108 -77.25,108 -77.6,108 -77.95,108 -78.3,108 -78.65,108 -79,107.35 -79,106.7 -79,106.05 -79,105.4 -79,104.75 -79,104.1 -79,103.45 -79,102.8 -79,102.15 -79,101.5 -79,101.5 -78.65,101.5 -78.3,101.5 -77.95,101.5 -77.6,101.5 -77.25,101.5 -76.9,101.5 -76.55,101.5 -76.2,101.5 -75.85,101.5 -75.5))"] |
|
SOAR-Lake Vostok survey magnetic anomaly data
|
9911617 9978236 |
2020-04-28 | Studinger, Michael S.; Bell, Robin |
Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work
Continuation of Activities for the Support Office for Aerogeophysical Research (SOAR) |
Processed Magnetometer Data acquired during the SOAR Twin Otter expedition SOAR-LVS (2000) This data set was acquired with a Magnetometer during SOAR Twin Otter expedition SOAR-LVS conducted in 2000 (Chief Scientist: Dr. Robin Bell; Investigator(s): Dr. Robin Bell and Dr. Michael Studinger). These data files are of ASCII format and include IGRF Anomaly Magnetic data and were processed after data collection. Data were acquired as part of the project(s): SOAR-Lake Vostok Survey (LVS) and Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work | ["POLYGON((101.5 -75.5,102.15 -75.5,102.8 -75.5,103.45 -75.5,104.1 -75.5,104.75 -75.5,105.4 -75.5,106.05 -75.5,106.7 -75.5,107.35 -75.5,108 -75.5,108 -75.85,108 -76.2,108 -76.55,108 -76.9,108 -77.25,108 -77.6,108 -77.95,108 -78.3,108 -78.65,108 -79,107.35 -79,106.7 -79,106.05 -79,105.4 -79,104.75 -79,104.1 -79,103.45 -79,102.8 -79,102.15 -79,101.5 -79,101.5 -78.65,101.5 -78.3,101.5 -77.95,101.5 -77.6,101.5 -77.25,101.5 -76.9,101.5 -76.55,101.5 -76.2,101.5 -75.85,101.5 -75.5))"] |
|
SOAR-Lake Vostok Survey Gravity data
|
9911617 9978236 |
2020-04-28 | Studinger, Michael S.; Bell, Robin |
Continuation of Activities for the Support Office for Aerogeophysical Research (SOAR) Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work |
Processed Gravimeter Data acquired during the SOAR Twin Otter expedition SOAR-LVS (2000). This data set was acquired with a Gravimeter during SOAR Twin Otter expedition SOAR-LVS conducted in 2000 (Investigator(s): Dr. Robin Bell and Dr. Michael Studinger). These data files are of ASCII format and include Free Air Anomaly Gravity data and were processed after data collection. Data were acquired as part of the project(s): SOAR-Lake Vostok Survey (LVS) and Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work. | ["POLYGON((101.5 -75.5,102.15 -75.5,102.8 -75.5,103.45 -75.5,104.1 -75.5,104.75 -75.5,105.4 -75.5,106.05 -75.5,106.7 -75.5,107.35 -75.5,108 -75.5,108 -75.85,108 -76.2,108 -76.55,108 -76.9,108 -77.25,108 -77.6,108 -77.95,108 -78.3,108 -78.65,108 -79,107.35 -79,106.7 -79,106.05 -79,105.4 -79,104.75 -79,104.1 -79,103.45 -79,102.8 -79,102.15 -79,101.5 -79,101.5 -78.65,101.5 -78.3,101.5 -77.95,101.5 -77.6,101.5 -77.25,101.5 -76.9,101.5 -76.55,101.5 -76.2,101.5 -75.85,101.5 -75.5))"] |
|
SOAR-Lake Vostok Survey airborne radar data
|
9911617 9978236 |
2020-04-28 | Studinger, Michael S.; Bell, Robin |
Continuation of Activities for the Support Office for Aerogeophysical Research (SOAR) Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work |
Processed IcePenetrating Radar Altimeter Shot Data (version 2) acquired during the SOAR Twin Otter expedition SOAR-LVS (2000) This data set was acquired with a IcePenetrating Radar Altimeter during SOAR Twin Otter expedition SOAR-LVS conducted in 2000 (Chief Scientist: Dr. Robin Bell; Investigator(s): Dr. Robin Bell and Dr. Michael Studinger). These data files are of SEGY format and include Reflection Radar shot data and were processed after data collection. Data were acquired as part of the project(s): SOAR-Lake Vostok Survey (LVS) and Understanding the Boundary Conditions of the Lake Vostok Environment: A Site Survey for Future Work | ["POLYGON((101.5 -75.5,102.15 -75.5,102.8 -75.5,103.45 -75.5,104.1 -75.5,104.75 -75.5,105.4 -75.5,106.05 -75.5,106.7 -75.5,107.35 -75.5,108 -75.5,108 -75.85,108 -76.2,108 -76.55,108 -76.9,108 -77.25,108 -77.6,108 -77.95,108 -78.3,108 -78.65,108 -79,107.35 -79,106.7 -79,106.05 -79,105.4 -79,104.75 -79,104.1 -79,103.45 -79,102.8 -79,102.15 -79,101.5 -79,101.5 -78.65,101.5 -78.3,101.5 -77.95,101.5 -77.6,101.5 -77.25,101.5 -76.9,101.5 -76.55,101.5 -76.2,101.5 -75.85,101.5 -75.5))"] |
|
SOAR-WAZ Airborne gravity data for the CASERTZ/WAIS project
|
9319854 |
2020-04-24 | Bell, Robin; Arko, Robert A. |
Collaborative Research: Lithospheric Controls on the Behavior of the West Antarctic Ice Sheet: Corridor Aerogeophysics of Eastern Ross Transect Zone |
Free air gravity anomaly data collected as part of the Corridor Aerogeophysics of Eastern Ross Transect Zone CASERTZ/WAIS project. | ["POLYGON((-155 -77.5,-150 -77.5,-145 -77.5,-140 -77.5,-135 -77.5,-130 -77.5,-125 -77.5,-120 -77.5,-115 -77.5,-110 -77.5,-105 -77.5,-105 -78.2,-105 -78.9,-105 -79.6,-105 -80.3,-105 -81,-105 -81.7,-105 -82.4,-105 -83.1,-105 -83.8,-105 -84.5,-110 -84.5,-115 -84.5,-120 -84.5,-125 -84.5,-130 -84.5,-135 -84.5,-140 -84.5,-145 -84.5,-150 -84.5,-155 -84.5,-155 -83.8,-155 -83.1,-155 -82.4,-155 -81.7,-155 -81,-155 -80.3,-155 -79.6,-155 -78.9,-155 -78.2,-155 -77.5))"] |
|
SOAR-TKD airborne gravity data for the CASERTZ/WAIS project
|
9319854 |
2020-04-24 | Bell, Robin; Arko, Robert A. |
Collaborative Research: Lithospheric Controls on the Behavior of the West Antarctic Ice Sheet: Corridor Aerogeophysics of Eastern Ross Transect Zone |
Free air gravity anomaly data collected as part of the Corridor Aerogeophysics of Eastern Ross Transect Zone CASERTZ/WAIS project. | ["POLYGON((-155 -77.5,-150 -77.5,-145 -77.5,-140 -77.5,-135 -77.5,-130 -77.5,-125 -77.5,-120 -77.5,-115 -77.5,-110 -77.5,-105 -77.5,-105 -78.2,-105 -78.9,-105 -79.6,-105 -80.3,-105 -81,-105 -81.7,-105 -82.4,-105 -83.1,-105 -83.8,-105 -84.5,-110 -84.5,-115 -84.5,-120 -84.5,-125 -84.5,-130 -84.5,-135 -84.5,-140 -84.5,-145 -84.5,-150 -84.5,-155 -84.5,-155 -83.8,-155 -83.1,-155 -82.4,-155 -81.7,-155 -81,-155 -80.3,-155 -79.6,-155 -78.9,-155 -78.2,-155 -77.5))"] |
|
Airborne gravity data for the CASERTZ/WAIS project
|
9319854 |
2020-04-24 | Bell, Robin; Arko, Robert A. |
Collaborative Research: Lithospheric Controls on the Behavior of the West Antarctic Ice Sheet: Corridor Aerogeophysics of Eastern Ross Transect Zone |
Free air gravity anomaly data collected as part of the Corridor Aerogeophysics of Eastern Ross Transect Zone CASERTZ/WAIS project. | ["POLYGON((-155 -77.5,-150 -77.5,-145 -77.5,-140 -77.5,-135 -77.5,-130 -77.5,-125 -77.5,-120 -77.5,-115 -77.5,-110 -77.5,-105 -77.5,-105 -78.2,-105 -78.9,-105 -79.6,-105 -80.3,-105 -81,-105 -81.7,-105 -82.4,-105 -83.1,-105 -83.8,-105 -84.5,-110 -84.5,-115 -84.5,-120 -84.5,-125 -84.5,-130 -84.5,-135 -84.5,-140 -84.5,-145 -84.5,-150 -84.5,-155 -84.5,-155 -83.8,-155 -83.1,-155 -82.4,-155 -81.7,-155 -81,-155 -80.3,-155 -79.6,-155 -78.9,-155 -78.2,-155 -77.5))"] |
|
SOAR-PPT Airborne gravity data
|
9615704 |
2020-04-24 | Bell, Robin |
Contrasting Architecture and Dynamics of the Transantarctic Mountains |
Free air gravity anomaly data collected along flight tracks of the Pensacola-Pole Transect as part of the Contrasting Architecture and Dynamics in the Transantarctic Mountains project. | ["POLYGON((-180 -84,-176 -84,-172 -84,-168 -84,-164 -84,-160 -84,-156 -84,-152 -84,-148 -84,-144 -84,-140 -84,-140 -84.6,-140 -85.2,-140 -85.8,-140 -86.4,-140 -87,-140 -87.6,-140 -88.2,-140 -88.8,-140 -89.4,-140 -90,-144 -90,-148 -90,-152 -90,-156 -90,-160 -90,-164 -90,-168 -90,-172 -90,-176 -90,180 -90,179.5 -90,179 -90,178.5 -90,178 -90,177.5 -90,177 -90,176.5 -90,176 -90,175.5 -90,175 -90,175 -89.4,175 -88.8,175 -88.2,175 -87.6,175 -87,175 -86.4,175 -85.8,175 -85.2,175 -84.6,175 -84,175.5 -84,176 -84,176.5 -84,177 -84,177.5 -84,178 -84,178.5 -84,179 -84,179.5 -84,-180 -84))"] |
|
SOAR-WMB Airborne gravity data
|
9615281 |
2020-04-24 | Bell, Robin |
Air-Ground Study of Tectonics at the Boundary Between the Eastern Ross Embayment and Western Marie Byrd Land, Antarctica: Basement Geology and Structure |
Free air gravity anomaly data collected along flight tracks of the Western Marie Byrd Land and Ross Sea Boundary | ["POLYGON((-175 -76,-171 -76,-167 -76,-163 -76,-159 -76,-155 -76,-151 -76,-147 -76,-143 -76,-139 -76,-135 -76,-135 -76.8,-135 -77.6,-135 -78.4,-135 -79.2,-135 -80,-135 -80.8,-135 -81.6,-135 -82.4,-135 -83.2,-135 -84,-139 -84,-143 -84,-147 -84,-151 -84,-155 -84,-159 -84,-163 -84,-167 -84,-171 -84,-175 -84,-175 -83.2,-175 -82.4,-175 -81.6,-175 -80.8,-175 -80,-175 -79.2,-175 -78.4,-175 -77.6,-175 -76.8,-175 -76))"] |
|
SOAR-WLK Airborne gravity data
|
9615704 |
2020-04-24 | Bell, Robin |
Contrasting Architecture and Dynamics of the Transantarctic Mountains |
Free air gravity anomaly data collected along flight tracks of the Wilkes Basin Corridor as part of the Contrasting Architecture and Dynamics in the Transantarctic Mountains project. | ["POLYGON((115 -74,121 -74,127 -74,133 -74,139 -74,145 -74,151 -74,157 -74,163 -74,169 -74,175 -74,175 -74.4,175 -74.8,175 -75.2,175 -75.6,175 -76,175 -76.4,175 -76.8,175 -77.2,175 -77.6,175 -78,169 -78,163 -78,157 -78,151 -78,145 -78,139 -78,133 -78,127 -78,121 -78,115 -78,115 -77.6,115 -77.2,115 -76.8,115 -76.4,115 -76,115 -75.6,115 -75.2,115 -74.8,115 -74.4,115 -74))"] |
|
SOAR-IRE airborne gravity data for the CASERTZ/WAIS project
|
9319854 |
2020-04-24 | Bell, Robin; Arko, Robert A. |
Collaborative Research: Lithospheric Controls on the Behavior of the West Antarctic Ice Sheet: Corridor Aerogeophysics of Eastern Ross Transect Zone |
Free air gravity anomaly data collected as part of the Corridor Aerogeophysics of Eastern Ross Transect Zone CASERTZ/WAIS project. IRE field season | ["POLYGON((-155 -77.5,-150 -77.5,-145 -77.5,-140 -77.5,-135 -77.5,-130 -77.5,-125 -77.5,-120 -77.5,-115 -77.5,-110 -77.5,-105 -77.5,-105 -78.2,-105 -78.9,-105 -79.6,-105 -80.3,-105 -81,-105 -81.7,-105 -82.4,-105 -83.1,-105 -83.8,-105 -84.5,-110 -84.5,-115 -84.5,-120 -84.5,-125 -84.5,-130 -84.5,-135 -84.5,-140 -84.5,-145 -84.5,-150 -84.5,-155 -84.5,-155 -83.8,-155 -83.1,-155 -82.4,-155 -81.7,-155 -81,-155 -80.3,-155 -79.6,-155 -78.9,-155 -78.2,-155 -77.5))"] |
|
Processed Ice Penetrating Radar Data (Matlab format) from the Gamburtsev Mountains in Antarctica acquired during GAMBIT
|
0632292 |
2020-04-20 | Bell, Robin; Studinger, Michael S. |
Collaborative Research: IPY: GAMBIT: Gamburtsev Aerogeophysical Mapping of Bedrock and Ice Targets |
This data set was acquired with a Ice Penetrating Radar Altimeter during GAMBIT Twin Otter expedition AGAP_GAMBIT conducted in 2008 (Chief Scientist: Dr. Robin Bell). These data files are of MATLAB format and include Reflection Radar data and were processed after data collection. Data were acquired as part of the project(s): AGAP: Exploring the Gamburtsev Subglacial Mountains during the International Polar Year 2007 - 2008 and Antarctica's Gamburtsev Province Project (AGAP). | ["POLYGON((65 -77.5,67.4 -77.5,69.8 -77.5,72.2 -77.5,74.6 -77.5,77 -77.5,79.4 -77.5,81.8 -77.5,84.2 -77.5,86.6 -77.5,89 -77.5,89 -78.25,89 -79,89 -79.75,89 -80.5,89 -81.25,89 -82,89 -82.75,89 -83.5,89 -84.25,89 -85,86.6 -85,84.2 -85,81.8 -85,79.4 -85,77 -85,74.6 -85,72.2 -85,69.8 -85,67.4 -85,65 -85,65 -84.25,65 -83.5,65 -82.75,65 -82,65 -81.25,65 -80.5,65 -79.75,65 -79,65 -78.25,65 -77.5))"] |
|
Processed Ice Penetrating Radar Data (jpeg images) from the Gamburtsev Mountains in Antarctica acquired during GAMBIT
|
0632292 |
2020-04-20 | Bell, Robin; Studinger, Michael S. |
Collaborative Research: IPY: GAMBIT: Gamburtsev Aerogeophysical Mapping of Bedrock and Ice Targets |
This data set was acquired with a Ice Penetrating Radar Altimeter during GAMBIT Twin Otter expedition AGAP_GAMBIT conducted in 2008 (Chief Scientist: Dr. Robin Bell). These data files are jpeg images of Reflection Radar data and were processed after data collection. Data were acquired as part of the project(s): AGAP: Exploring the Gamburtsev Subglacial Mountains during the International Polar Year 2007 - 2008 and Antarctica's Gamburtsev Province Project (AGAP). | ["POLYGON((65 -77.5,67.4 -77.5,69.8 -77.5,72.2 -77.5,74.6 -77.5,77 -77.5,79.4 -77.5,81.8 -77.5,84.2 -77.5,86.6 -77.5,89 -77.5,89 -78.25,89 -79,89 -79.75,89 -80.5,89 -81.25,89 -82,89 -82.75,89 -83.5,89 -84.25,89 -85,86.6 -85,84.2 -85,81.8 -85,79.4 -85,77 -85,74.6 -85,72.2 -85,69.8 -85,67.4 -85,65 -85,65 -84.25,65 -83.5,65 -82.75,65 -82,65 -81.25,65 -80.5,65 -79.75,65 -79,65 -78.25,65 -77.5))"] |
|
Processed Ice Penetrating Radar Data (Netcdf format) from the Gamburtsev Mountains in Antarctica acquired during GAMBIT
|
0632292 |
2020-04-20 | Bell, Robin; Studinger, Michael S. |
Collaborative Research: IPY: GAMBIT: Gamburtsev Aerogeophysical Mapping of Bedrock and Ice Targets |
This data set was acquired with a Ice Penetrating Radar Altimeter during GAMBIT Twin Otter expedition AGAP_GAMBIT conducted in 2008 (Chief Scientist: Dr. Robin Bell). These data files are of Netcdf format and include Reflection Radar data and were processed after data collection. Data were acquired as part of the project(s): AGAP: Exploring the Gamburtsev Subglacial Mountains during the International Polar Year 2007 - 2008 and Antarctica's Gamburtsev Province Project (AGAP). | ["POLYGON((65 -77.5,67.4 -77.5,69.8 -77.5,72.2 -77.5,74.6 -77.5,77 -77.5,79.4 -77.5,81.8 -77.5,84.2 -77.5,86.6 -77.5,89 -77.5,89 -78.25,89 -79,89 -79.75,89 -80.5,89 -81.25,89 -82,89 -82.75,89 -83.5,89 -84.25,89 -85,86.6 -85,84.2 -85,81.8 -85,79.4 -85,77 -85,74.6 -85,72.2 -85,69.8 -85,67.4 -85,65 -85,65 -84.25,65 -83.5,65 -82.75,65 -82,65 -81.25,65 -80.5,65 -79.75,65 -79,65 -78.25,65 -77.5))"] |
|
Processed Ice Penetrating Radar Altimeter Shot Data (SEGY, version 1) from the Gamburtsev Mountains in Antarctica acquired during the GAMBIT Twin Otter expedition AGAP_GAMBIT (2008)
|
0632292 |
2020-04-20 | Bell, Robin |
Collaborative Research: IPY: GAMBIT: Gamburtsev Aerogeophysical Mapping of Bedrock and Ice Targets |
This data set was acquired with a Ice Penetrating Radar Altimeter during GAMBIT Twin Otter expedition AGAP_GAMBIT conducted in 2008 (Chief Scientist: Dr. Robin Bell). These data files are of SEGY format and include Reflection Radar shot data and were processed after data collection. Data were acquired as part of the project(s): AGAP: Exploring the Gamburtsev Subglacial Mountains during the International Polar Year 2007 - 2008 and Antarctica's Gamburtsev Province Project (AGAP). | ["POLYGON((65 -77.5,67.4 -77.5,69.8 -77.5,72.2 -77.5,74.6 -77.5,77 -77.5,79.4 -77.5,81.8 -77.5,84.2 -77.5,86.6 -77.5,89 -77.5,89 -78.25,89 -79,89 -79.75,89 -80.5,89 -81.25,89 -82,89 -82.75,89 -83.5,89 -84.25,89 -85,86.6 -85,84.2 -85,81.8 -85,79.4 -85,77 -85,74.6 -85,72.2 -85,69.8 -85,67.4 -85,65 -85,65 -84.25,65 -83.5,65 -82.75,65 -82,65 -81.25,65 -80.5,65 -79.75,65 -79,65 -78.25,65 -77.5))"] |
|
Norwegian Processed ship-based Gravimeter data from the Antarctica assembled as part of the ADGRAV Data Compilation (1990)
|
9725374 |
2020-04-17 | Tronstad, Stein; Bell, Robin |
The Development of a New Generation Gravity Map of Antarctica |
This data set was acquired with a ship-based Gravimeter assembled as part of the 1990 ADGRAV data compilation. Norwegian data sources provided by Dr. Stein Tronstad. These data files are of Text File format and include Gravity Free Air Anomaly data and were processed after data collection. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
CNES processed Gravimeter Data from the Antarctica (Continent) assembled as part of the ADGRAV Data Compilation (1990)
|
9725374 |
2020-04-17 | Biancale, Richard; Bell, Robin |
The Development of a New Generation Gravity Map of Antarctica |
This data set was acquired with a ship-based Gravimeter assembled as part of the 1990 ADGRAV data compilation. CNES (France) data sources provided by Dr. Richard Biancale. These data files are of Text File format and include Gravity Free Air Anomaly data and were processed after data collection. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
AWI processed ship-based Gravimeter Data from the Antarctica assembled as part of the ADGRAV Data Compilation (1990)
|
9725374 |
2020-04-17 | Bell, Robin; Jokat, Wilfred |
The Development of a New Generation Gravity Map of Antarctica |
This data set was acquired with a ship-based Gravimeter assembled as part of the 1990 ADGRAV data compilation. AWI data sources provided by Dr. Wilfried Jokat. These data files are of Text File format and include Gravity Free Air Anomaly data and were processed after data collection. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Russian processed Gravimeter data from the Antarctica assembled as part of the ADGRAV Data Compilation (1990)
|
9725374 |
2020-04-17 | Andrianov, Sergei; Bell, Robin |
The Development of a New Generation Gravity Map of Antarctica |
This data set was acquired with a ship-based Gravimeter assembled as part of the 1990 ADGRAV data compilation (Chief Scientist: Dr. Robin Bell; Investigator(s): Dr. Sergei Andrianov). These data files are of Text File (ASCII) format and include Gravity Free Air Anomaly data and were processed after data collection. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
BGR processed Gravimeter data from the Antarctica assembled as part of the ADGRAV Data Compilation (1990)
|
9725374 |
2020-04-17 | Damaske, Detlef; Bell, Robin |
The Development of a New Generation Gravity Map of Antarctica |
This data set was acquired with a ship-based Gravimeter assembled as part of the 1990 ADGRAV data compilation (Chief Scientist: Dr. Robin Bell; Investigator(s): Dr. Detlef Damaske). These data files are of Text File (ASCII) format and include Gravity Free Air Anomaly data and were processed after data collection. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Japanese processed Gravimeter Data from the Antarctica assembled as part of the ADGRAV Data Compilation (1990)
|
9725374 |
2020-04-17 | Nogi, Yasufumi; Bell, Robin |
The Development of a New Generation Gravity Map of Antarctica |
This data set was acquired with a ship-based Gravimeter assembled as part of the 1990 ADGRAV data compilation (Chief Scientist: Dr. Robin Bell; Investigator(s): Dr. Yasufumi Nogi). These data files are of Text File (ASCII) format and include Gravity Free Air Anomaly data and were processed after data collection. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Particle composition measurements from along 170°W between 67-54°S
|
1341432 1341464 |
2020-04-09 | Robinson, Rebecca; Brzezinski, Mark |
Collaborative Proposal: A Field and Laboratory Examination of the Diatom N and Si Isotope Proxies: Implications for Assessing the Southern Ocean Biological Pump |
This dataset contains profiles of water column particulate organic carbon (POC), total particulate nitrogen (TPN), biogenic silica, and d15N of TPN from McLane pump casts (4 depths/cast). | ["POLYGON((-175 -54,-174 -54,-173 -54,-172 -54,-171 -54,-170 -54,-169 -54,-168 -54,-167 -54,-166 -54,-165 -54,-165 -55.3,-165 -56.6,-165 -57.9,-165 -59.2,-165 -60.5,-165 -61.8,-165 -63.1,-165 -64.4,-165 -65.7,-165 -67,-166 -67,-167 -67,-168 -67,-169 -67,-170 -67,-171 -67,-172 -67,-173 -67,-174 -67,-175 -67,-175 -65.7,-175 -64.4,-175 -63.1,-175 -61.8,-175 -60.5,-175 -59.2,-175 -57.9,-175 -56.6,-175 -55.3,-175 -54))"] |
|
High-resolution benthic seawater temperature record 1999-2012 (25-40m depth) from near intake jetty at McMurdo Station, Antarctica
|
0231006 1142158 |
2020-04-08 | Cheng, Chi-Hing; Cziko, Paul; Devries, Arthur |
Antarctic Notothenioid Fish Freeze Avoidance and Genome-wide Evolution for Life in the Cold |
Benthic seawater temperature (within 10cm of the bottom) from near the McMurdo Station, Ross Island, Antarctica saltwater intake jetty. Data collected at two nearby locations: On muddy bottom at base of artificial rock jetty (~25m depth), and ~50m west of the Jetty in sponge/spicule mat habitat (~40m depth). | ["POLYGON((163 -76.5,163.5 -76.5,164 -76.5,164.5 -76.5,165 -76.5,165.5 -76.5,166 -76.5,166.5 -76.5,167 -76.5,167.5 -76.5,168 -76.5,168 -76.63,168 -76.76,168 -76.89,168 -77.02,168 -77.15,168 -77.28,168 -77.41,168 -77.54,168 -77.67,168 -77.8,167.5 -77.8,167 -77.8,166.5 -77.8,166 -77.8,165.5 -77.8,165 -77.8,164.5 -77.8,164 -77.8,163.5 -77.8,163 -77.8,163 -77.67,163 -77.54,163 -77.41,163 -77.28,163 -77.15,163 -77.02,163 -76.89,163 -76.76,163 -76.63,163 -76.5))"] |
|
Weddell Seal Heat Flux Dataset
|
1246463 |
2020-04-06 | Walcott, Skyla |
The Cost of A New Fur Coat: Interactions between Molt and Reproduction in Weddell Seals |
All thermoregulatory measurements of handled Weddell seals during pre-molt and molt seasons of Austral summers 2013, 2014 2015, and 2016. Seals that were unhandled did not have all data available. All environmental conditions included. | ["POLYGON((164 -76,164.2 -76,164.4 -76,164.6 -76,164.8 -76,165 -76,165.2 -76,165.4 -76,165.6 -76,165.8 -76,166 -76,166 -76.2,166 -76.4,166 -76.6,166 -76.8,166 -77,166 -77.2,166 -77.4,166 -77.6,166 -77.8,166 -78,165.8 -78,165.6 -78,165.4 -78,165.2 -78,165 -78,164.8 -78,164.6 -78,164.4 -78,164.2 -78,164 -78,164 -77.8,164 -77.6,164 -77.4,164 -77.2,164 -77,164 -76.8,164 -76.6,164 -76.4,164 -76.2,164 -76))"] |
|
SPC14 carbonyl sulfide, methyl chloride, and methyl bromide measurements from South Pole, Antarctica
|
1443470 |
2020-04-01 | Aydin, Murat |
Carbonyl Sulfide, Methyl Chloride, and Methyl Bromide Measurements in the New Intermediate-depth South Pole Ice Core |
The data file includes the results of the carbonyl sulfide (COS), methyl chloride (CH3Cl), and methyl bromide (CH3Br) measurements from the SPC14 ice core drilled at the South Pole as part of the SPICEcore project. There are a total of 425 measurements. The file is an Excel worksheet saved in .xlsx format. The are seven columns: depth (m), COS (ppt), err (ppt), CH3Cl (ppt), err (ppt), CH3Br (ppt), err (ppt). The depth column is the mid-depth of the samples calculated from top and bottom depth measurements conducted during the CPL. All measurements are reported as dry molar mixing ratios in parts per trillion (ppt). The err column after the data for each compound is the plus/minus 1 sigma uncertainty estimate in ppt’s and it is the cumulative uncertainty based on the precision of the analytical measurement plus the uncertainty that arises from the variability in the background (blank) trace gas levels in the ice core extraction system. The background trace gas levels in the ice core gas extraction and the analytical systems are determined by regularly conducting nitrogen (N2) blanks. Please refer to Aydin et al. [JGR doi:10.1029/2006JD008027, 2007] for details of the measurement methods and the calibration practices. A few instances of missing data are denoted by -999. Contact with the PI encouraged before data usage. | ["POLYGON((-180 -90,-144 -90,-108 -90,-72 -90,-36 -90,0 -90,36 -90,72 -90,108 -90,144 -90,180 -90,180 -90,180 -90,180 -90,180 -90,180 -90,180 -90,180 -90,180 -90,180 -90,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -90,-180 -90,-180 -90,-180 -90,-180 -90,-180 -90,-180 -90,-180 -90,-180 -90,-180 -90))"] |
|
Dissolved nutrient profiles from along 170°W between 67 and 54°S
|
1341464 1341432 |
2020-03-31 | Robinson, Rebecca; Brzezinski, Mark |
Collaborative Proposal: A Field and Laboratory Examination of the Diatom N and Si Isotope Proxies: Implications for Assessing the Southern Ocean Biological Pump |
This dataset contains the water column profiles of dissolved nutrients, NO3, PO4, dissolved Si, biogenic Si, lithogenic Si, chlorophyll and phaeophytin concentrations, and the d15NO3. | ["POLYGON((-175 -54,-174 -54,-173 -54,-172 -54,-171 -54,-170 -54,-169 -54,-168 -54,-167 -54,-166 -54,-165 -54,-165 -55.3,-165 -56.6,-165 -57.9,-165 -59.2,-165 -60.5,-165 -61.8,-165 -63.1,-165 -64.4,-165 -65.7,-165 -67,-166 -67,-167 -67,-168 -67,-169 -67,-170 -67,-171 -67,-172 -67,-173 -67,-174 -67,-175 -67,-175 -65.7,-175 -64.4,-175 -63.1,-175 -61.8,-175 -60.5,-175 -59.2,-175 -57.9,-175 -56.6,-175 -55.3,-175 -54))"] |
|
SPICEcore Advection
|
1443471 |
2020-03-25 | Fudge, T. J. |
Collaborative Research: Characterization of Upstream Ice and Firn Dynamics affecting the South Pole Ice Core |
The South Pole Ice Core (SPICEcore), which spans the past 54,300 years, was drilled far from an ice divide such that ice recovered at depth originated upstream of the core site. If the climate is different upstream, the climate history recovered from the core will be a combination of the upstream conditions advected to the core site and temporal changes. Here, we evaluate the impact of ice advection on two fundamental records from SPICEcore: accumulation rate and water isotopes. We determined past locations of ice deposition based on GPS measurements of the modern velocity field spanning 100 km upstream, where ice of ~20 ka age would likely have originated. Beyond 100 km, there are no velocity measurements, but ice likely originates from Titan Dome, an additional 90 km distant. Shallow radar measurements extending 100 km upstream from the core site reveal large (~20%) variations in accumulation but no significant trend. Water isotope ratios, measured at 12.5 km intervals for the first 100 km of the flowline, show a decrease with elevation of -0.008‰ m-1 for δ18O. Advection adds approximately 1‰ for δ18O to the LGM-to-modern change. We also use an existing ensemble of continental ice-sheet model runs to assess the ice sheet elevation change through time. The magnitude of elevation change is likely small and the sign uncertain. Assuming a lapse rate of 10°C per km of elevation, the inference of LGM-to-modern temperature change is ~1.4°C smaller than if the flow from upstream is not considered. | ["POINT(-98.16 -89.99)"] |
|
Investigating Ultra-low Velocity Zones (ULVZs) using an Antarctic Dataset
|
1643551 |
2020-03-10 | Hansen, Samantha; Carson, Sarah; Garnero, Edward; Yu, Shule; Rost, Sebastian |
Collaborative Research: Antarctic Seismic Investigations of ULVZ Structure |
Dataset includes information on all A- and B-ranked earthquakes (see Hansen et al., 2020) recorded by the Antarctic TAMNNET seismic array that were examined for ULVZ evidence. Information on their attenuation (t*) parameter, signal-to-noise ratio, core-mantle boundary bouncepoint location, and average remainder trace standard deviation are also provided. The provided figure indicates where ULVZ evidence has been found and where possible ULVZ evidence may be indicated. | [] |
|
Radioisotope dates and carbon (δ13C) and nitrogen (δ15N) stable isotope values from modern and mummified Adélie Penguin chick carcasses and tissue from the Ross Sea, Antarctica
|
1443424 1443585 1443386 1826712 |
2020-03-03 | Kristan, Allyson; Emslie, Steven; Patterson, William |
Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators |
This data set contains measurements of carbon (δ13C) and nitrogen (δ15N) stable isotope values of feather, skin, bone, and toenail samples of mummified Adélie penguin chick remains excavated from multiple sites around the Ross Sea region of Antarctica between 2004 and 2016, as well as the same measurements for modern Adélie chicks collected from the surface of Cape Hallett and Adelie Cove in January 2016. Stable isotope analyses were conducted using an elemental analyzer coupled to a continuous flow stable isotope ratio mass spectrometer. Where possible, accelerator Mass Spectrometry (AMS) radiocarbon dates on selected mummy tissues were completed at the Rafter Radiocarbon Laboratory, New Zealand (NZA), Beta Analytic, Inc. (Beta), the University of Georgia Center for Applied Isotope Studies (UGAMS), and Woods Hole National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility. All dates were corrected for the marine carbon reservoir effect and calibrated to calendar years before present (cal years BP) using a ΔR of 750 ± 50 years and the MARINE13 calibration curve in Calib 7.0 (2σ range). The data set also includes excavation/collection site names and latitude/longitude, date of excavation/collection, tissue used for radiocarbon dating, and carbon to nitrogen ratios. Details of the data set and all relevant methods are provided in Kristan et. al., 2019. | ["POLYGON((162 -72,162.9 -72,163.8 -72,164.7 -72,165.6 -72,166.5 -72,167.4 -72,168.3 -72,169.2 -72,170.1 -72,171 -72,171 -72.6,171 -73.2,171 -73.8,171 -74.4,171 -75,171 -75.6,171 -76.2,171 -76.8,171 -77.4,171 -78,170.1 -78,169.2 -78,168.3 -78,167.4 -78,166.5 -78,165.6 -78,164.7 -78,163.8 -78,162.9 -78,162 -78,162 -77.4,162 -76.8,162 -76.2,162 -75.6,162 -75,162 -74.4,162 -73.8,162 -73.2,162 -72.6,162 -72))"] |
|
Measurements of 14CH4 and 14CO in ice from Taylor Glacier: Last Deglaciation and Deep Core Results
|
1245659 |
2020-02-28 | Petrenko, Vasilii; Dyonisius, Michael |
Collaborative Research: The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive |
This data set contains measurements of 14CH4 and 14CO in ice cores from Taylor Glacier, Antarctica. This includes measurements in ice from the last deglaciation (18 - 8 kyr), for the purposes of paleoatmospheric 14CH4 reconstruction. The data set also includes measurements in older ice (50 - 70 kyr) from a deep ice core, made for the purposes of studying in situ cosmogenic 14C production in ice. All data are in excel format. | ["POINT(161.71353 -77.75855)"] |
|
NBP1402 diatom data
|
1143836 |
2020-02-27 | Leventer, Amy; NBP1402 science party, |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
Totten Glacier is the termination of the largest marine-based portion of the East Antarctic Ice Sheet, the Aurora Subglacial Basin. Yet little is known about the glacial evolution of the catchment and the factors influencing its present and past behavior. Due its remote location and heavy sea ice, the continental shelf in front of the Totten Glacier had not been comprehensively surveyed prior to this study. Satellite observations indicate that the Totten ice drainage system is thinning, and it has been hypothesized that this thinning is in response to undermelting by warm ocean waters over the continental shelf. While this process is observed elsewhere in Antarctica (e.g. the rapidly retreating Pine Island Glacier in West Antarctica), the Totten Glacier system is potentially Antarcticas most important glacial drainage system due to its large size; it is three times larger than any system in West Antarctica. </br>The main goals of this proposal were: </br>To generate multibeam bathymetric maps of the continental shelf proximal to the Totten Glacier system to understand the recent regional glacial history and to document the pathways, if any, for circumpolar deep water to move onto the shelf. </br>To conduct a physical oceanographic survey of the region proximal to the Totten Glacier system, to determine the presence, if any, of warm ocean waters over the continental shelf.</br>To conduct a seismic survey of the continental shelf to assess the long-term evolution of the glacial system in the Aurora Subglacial Basin.</br>To collect marine sediment cores to determine the regional deglacial to Holocene climate history and the influence of warm circumpolar deep water. | ["POLYGON((117 -66,119.9 -66,122.8 -66,125.7 -66,128.6 -66,131.5 -66,134.4 -66,137.3 -66,140.2 -66,143.1 -66,146 -66,146 -66.1,146 -66.2,146 -66.3,146 -66.4,146 -66.5,146 -66.6,146 -66.7,146 -66.8,146 -66.9,146 -67,143.1 -67,140.2 -67,137.3 -67,134.4 -67,131.5 -67,128.6 -67,125.7 -67,122.8 -67,119.9 -67,117 -67,117 -66.9,117 -66.8,117 -66.7,117 -66.6,117 -66.5,117 -66.4,117 -66.3,117 -66.2,117 -66.1,117 -66))"] |
|
Detrital low-temperature thermochronometry from Bourgeois Fjord, AP
|
1543256 |
2020-02-27 | Clinger, Anna |
Antarctic Peninsula Exhumation and Landscape Development Investigated by Low-Temperature Detrital Thermochronometry |
This dataset contains 80 detrital and 2 bedrock apatite (U-Th)/He thermochronometric ages from Bourgeois Fjord. Data was collected to constrain timing and patterns of topographic change at Bourgeois Fjord on Ma timescales. Analyses were conducted at the Berkeley Geochronology Center and presented in Microsoft Excel formats. | ["POLYGON((-66.80688 -67.420674,-66.732895 -67.420674,-66.65891 -67.420674,-66.584925 -67.420674,-66.51094 -67.420674,-66.436955 -67.420674,-66.36297 -67.420674,-66.288985 -67.420674,-66.215 -67.420674,-66.141015 -67.420674,-66.06703 -67.420674,-66.06703 -67.4542151,-66.06703 -67.4877562,-66.06703 -67.5212973,-66.06703 -67.5548384,-66.06703 -67.5883795,-66.06703 -67.6219206,-66.06703 -67.6554617,-66.06703 -67.6890028,-66.06703 -67.7225439,-66.06703 -67.756085,-66.141015 -67.756085,-66.215 -67.756085,-66.288985 -67.756085,-66.36297 -67.756085,-66.436955 -67.756085,-66.51094 -67.756085,-66.584925 -67.756085,-66.65891 -67.756085,-66.732895 -67.756085,-66.80688 -67.756085,-66.80688 -67.7225439,-66.80688 -67.6890028,-66.80688 -67.6554617,-66.80688 -67.6219206,-66.80688 -67.5883795,-66.80688 -67.5548384,-66.80688 -67.5212973,-66.80688 -67.4877562,-66.80688 -67.4542151,-66.80688 -67.420674))"] |
|
Particle sizes of aerosol iron
|
1341494 |
2020-02-20 | Gao, Yuan |
Quantifying Atmospheric Iron Properties over West Antarctic Peninsula |
The dataset includes the particle size measurements of aerosol iron (Fe) through sampling of size-segregated aerosol particles made at Palmer Station, Antarctic Peninsula, which took place in the austral summer of 2016-2017. New results include particle-size distributions of total Fe, labile Fe, and fractional Fe solubility in aerosols from these samples. | ["POINT(-64.05 -64.766)"] |
|
Ross Sea ocean model simulation used to support ROSETTA-Ice
|
1443677 |
2020-02-14 | Springer, Scott; Howard, Susan L.; Padman, Laurence |
Collaborative Research: Uncovering the Ross Ocean and Ice Shelf Environment and Tectonic setting Through Aerogeophysical Surveys and Modeling (ROSETTA-ICE) |
This dataset contains a regional ocean-ice shelf model used to support and interpret the ROSETTA-Ice field program. A gzipped tar file containing the regional ROMS model code, configuration files, input files, and selected output files. The model simulation covers three years following a ten year spin up. Two sets of output files from the simulation are included. The first is the complete model output (T,S,u,v, etc.) averaged over 30 day intervals. The second is selected variable (T, S, and passive dye tracers) averaged over one day. Included Matlab scripts process these daily passive dye files into water masses and make a simple movie of the time evolution of the water mass distributions. For futher information, see the Supplemental Information of the associated publication (Tinto et al., 2019). | ["POLYGON((-180 -68,-175.85 -68,-171.7 -68,-167.55 -68,-163.4 -68,-159.25 -68,-155.1 -68,-150.95 -68,-146.8 -68,-142.65 -68,-138.5 -68,-138.5 -69.7,-138.5 -71.4,-138.5 -73.1,-138.5 -74.8,-138.5 -76.5,-138.5 -78.2,-138.5 -79.9,-138.5 -81.6,-138.5 -83.3,-138.5 -85,-142.65 -85,-146.8 -85,-150.95 -85,-155.1 -85,-159.25 -85,-163.4 -85,-167.55 -85,-171.7 -85,-175.85 -85,180 -85,177.4 -85,174.8 -85,172.2 -85,169.6 -85,167 -85,164.4 -85,161.8 -85,159.2 -85,156.6 -85,154 -85,154 -83.3,154 -81.6,154 -79.9,154 -78.2,154 -76.5,154 -74.8,154 -73.1,154 -71.4,154 -69.7,154 -68,156.6 -68,159.2 -68,161.8 -68,164.4 -68,167 -68,169.6 -68,172.2 -68,174.8 -68,177.4 -68,-180 -68))"] |
|
Chemical and physical characterization of Beacon Valley and Victoria Valley permafrost cores
|
1341680 |
2020-01-27 | Sletten, Ronald S. |
Ancient landscape-active Surfaces: Periglacial Hyperinflation in soils of Beacon Valley, Antarctica |
The dataset contains the cosmogenic nuclide values for Be-10 and Al-26 for a 30-m permafrost cores collected in Beacon Valley. | ["POLYGON((160.9 -76.7,161.08 -76.7,161.26 -76.7,161.44 -76.7,161.62 -76.7,161.8 -76.7,161.98 -76.7,162.16 -76.7,162.34 -76.7,162.52 -76.7,162.7 -76.7,162.7 -76.79,162.7 -76.88,162.7 -76.97,162.7 -77.06,162.7 -77.15,162.7 -77.24,162.7 -77.33,162.7 -77.42,162.7 -77.51,162.7 -77.6,162.52 -77.6,162.34 -77.6,162.16 -77.6,161.98 -77.6,161.8 -77.6,161.62 -77.6,161.44 -77.6,161.26 -77.6,161.08 -77.6,160.9 -77.6,160.9 -77.51,160.9 -77.42,160.9 -77.33,160.9 -77.24,160.9 -77.15,160.9 -77.06,160.9 -76.97,160.9 -76.88,160.9 -76.79,160.9 -76.7))"] |
|
Paleogene marine and terrestrial development of the West Antarctic Rift System: Palynomorph Data Set
|
0839059 |
2020-01-17 | Coenen, Jason; Baudoin, Patrick; Warny, Sophie; Askin, Rosemary; Scherer, Reed Paul; Castañeda, Isla |
Collaborative Research: Integrative Study of Marine Ice Sheet Stability & Subglacial Life Habitats in W Antarctica - Lake & Ice Stream Subglacial Access Research Drilling (LISSARD) |
This data set includes counts of palynomorphs from subglacial and sub-ice shelf tills from beneath the West Antarctic Ice Sheet. In addition to counts the biostratigraphic ranges are presented on separate tabs. | ["POLYGON((-180 -80,-174 -80,-168 -80,-162 -80,-156 -80,-150 -80,-144 -80,-138 -80,-132 -80,-126 -80,-120 -80,-120 -80.5,-120 -81,-120 -81.5,-120 -82,-120 -82.5,-120 -83,-120 -83.5,-120 -84,-120 -84.5,-120 -85,-126 -85,-132 -85,-138 -85,-144 -85,-150 -85,-156 -85,-162 -85,-168 -85,-174 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -84.5,180 -84,180 -83.5,180 -83,180 -82.5,180 -82,180 -81.5,180 -81,180 -80.5,180 -80,180 -80,180 -80,180 -80,180 -80,180 -80,180 -80,180 -80,180 -80,180 -80,-180 -80))"] |
|
Basal Melt, Ice thickness and structure of the Ross Ice Shelf using airborne radar data
|
1443534 |
2020-01-10 | Das, Indrani; Padman, Laurence; Bell, Robin; Fricker, Helen; Hulbe, Christina; Siddoway, Christine; Dhakal, Tejendra; Frearson, Nicholas; Mosbeux, Cyrille; Cordero, Isabel; Siegfried, Matt; Tinto, Kirsty |
Collaborative Research: Uncovering the Ross Ocean and Ice Shelf Environment and Tectonic setting Through Aerogeophysical Surveys and Modeling (ROSETTA-ICE) |
This dataset was produced for the manuscript \"Multi-decadal basal melt rates and structure of the Ross Ice Shelf, Antarctica using airborne ice penetrating radar\" by Das et al., 2020 in Journal of Geophysical Research-Earth Surface. It has total ice thickness, thickness of the LMI layer, strain induced thickness change, basal melt rates and the error estimate for basal melt rates. | ["POLYGON((-180 -77,-177 -77,-174 -77,-171 -77,-168 -77,-165 -77,-162 -77,-159 -77,-156 -77,-153 -77,-150 -77,-150 -77.9,-150 -78.8,-150 -79.7,-150 -80.6,-150 -81.5,-150 -82.4,-150 -83.3,-150 -84.2,-150 -85.1,-150 -86,-153 -86,-156 -86,-159 -86,-162 -86,-165 -86,-168 -86,-171 -86,-174 -86,-177 -86,180 -86,178.1 -86,176.2 -86,174.3 -86,172.4 -86,170.5 -86,168.6 -86,166.7 -86,164.8 -86,162.9 -86,161 -86,161 -85.1,161 -84.2,161 -83.3,161 -82.4,161 -81.5,161 -80.6,161 -79.7,161 -78.8,161 -77.9,161 -77,162.9 -77,164.8 -77,166.7 -77,168.6 -77,170.5 -77,172.4 -77,174.3 -77,176.2 -77,178.1 -77,-180 -77))"] |
|
South Pole high resolution ice core water stable isotope record for dD, d18O
|
1443328 1443105 |
2020-01-08 | Steig, Eric J.; White, James; Morris, Valerie; Vaughn, Bruce; Kahle, Emma; Schauer, Andrew; Jones, Tyler R. |
Collaborative Research: Record of the Triple-oxygen Isotope and Hydrogen Isotope Composition of Ice from an Ice Core at South Pole |
Isotopic data for the South Pole Ice Core has been generated under a collaborative effort by the University of Washington Isolab (NSF Award#1443105) and the University of Colorado INSTAAR Isotope Lab (NSF Award# 1443328). This data set contains high-resolution stable isotope data (dD, d18O,) for the South Pole Ice core. D17O is submitted under University of Washington Isolab (NSF Award#1443105). Drilling was initiated in 2014 and completed in 2016, and subsequent analyses on the ice were performed at the Institute of Arctic and Alpine Research, University of Colorado using Continuous Flow Analysis (CFA) as described in Jones et al. (2017). Entire meters of core are slowly melted and resulting water is converted to vapor for analysis with two cavity ring down spectrometers (CRDS), a Picarro L-2130 for dD and d18O, and a Picarro L-2140 for d17O and calculated D. Each meter of ice takes approximately 40 minutes to melt, and data are generated nominally at 1Hz, resulting in approximately 2,400 data points per meter. Each data point is ascribed to a specific depth using a depth-assignment algorithm that accounts for mixing within the system. Multiple data files are generated: a) Unfiltered data for dD, and d18O from the main core: 5 m → 1751 m depth, (4,934,966 total data points) including outliers; b) Sub sampled dD and d18O data from the main core created by averaging all non-flagged data points on 0.5 cm intervals, (350,200 data points); and c) d17O and subsequent D17O for depths 556m → 1751m. Users of the data should understand that the main core data includes all data, with a flagging that allows users to filter data (see README files). We also analyzed three replicate segments (809-951m, 1020-1078m and 1499-1542m), which serve to verify the new methodology, and serve as alternate data for any sections that were otherwise compromised. Tyler Jones, James W. C. White, Steig, E. J., Bruce H. Vaughn, Valerie Morris, Gkinis, V. , Markle, B. R. , Schoenemann, S. W. 2017: Improved methodologies for continuous-flow analysis of stable water isotopes in ice cores. Atmospheric Measurement Techniques, 10: 617-632. DOI: 10.5194/amt-10-617-2017 | ["POINT(0 -90)"] |
|
Sediment macrofaunal abundance and family richness from inner Andvord Bay to the open continental shelf
|
1443680 |
2019-12-31 | Smith, Craig |
Collaborative Research: Fjord Ecosystem Structure and Function on the West Antarctic Peninsula - Hotspots of Productivity and Biodiversity? (FjordEco) |
Sediment macrofaunal data collected by megacore (10-cm diameter sample tubes) along a down-fjord transect from inner Andvord Bay out onto the open continental shelf on the West Antarctic Peninsula. Sediment core samples from 0 - 10 cm depths were fixed in 4% formaldehyde, sieved on a 300 micron seive, and sorted with a dissecting microscope. | ["POLYGON((-66 -64,-65.6 -64,-65.2 -64,-64.8 -64,-64.4 -64,-64 -64,-63.6 -64,-63.2 -64,-62.8 -64,-62.4 -64,-62 -64,-62 -64.1,-62 -64.2,-62 -64.3,-62 -64.4,-62 -64.5,-62 -64.6,-62 -64.7,-62 -64.8,-62 -64.9,-62 -65,-62.4 -65,-62.8 -65,-63.2 -65,-63.6 -65,-64 -65,-64.4 -65,-64.8 -65,-65.2 -65,-65.6 -65,-66 -65,-66 -64.9,-66 -64.8,-66 -64.7,-66 -64.6,-66 -64.5,-66 -64.4,-66 -64.3,-66 -64.2,-66 -64.1,-66 -64))"] |
|
Paleogene marine and terrestrial development of the West Antarctic Rift System: Biomarker Data Set
|
0839059 |
2019-12-19 | Coenen, Jason; Castañeda, Isla; Askin, Rosemary ; Warny, Sophie; Baudoin, Patrick; Scherer, Reed Paul |
Collaborative Research: Integrative Study of Marine Ice Sheet Stability & Subglacial Life Habitats in W Antarctica - Lake & Ice Stream Subglacial Access Research Drilling (LISSARD) |
This data set includes biomarker data presented in Paleogene marine and terrestrial development of the West Antarctic Rift System. Included in the alkane sheet are the Terrestrial/aquatic (T/A) n-alkane ratio, total long (C27-C33)- and mid-chain (C23 and C25) n-alkane concentrations in units of ng alkanes per g sediment extracted, and the n-alkane average chain-length (ACL). Included in the glycerol dialkyl glycerol tetraethers (GDGT) sheet are the TEX86 sea surface temperature estimates with multiple calibrations discussed in the text, the MBT’5ME mean annual air temperature estimates, the branched and isoprenoid tetraether (BIT) index. | ["POLYGON((-180 -80,-174 -80,-168 -80,-162 -80,-156 -80,-150 -80,-144 -80,-138 -80,-132 -80,-126 -80,-120 -80,-120 -80.5,-120 -81,-120 -81.5,-120 -82,-120 -82.5,-120 -83,-120 -83.5,-120 -84,-120 -84.5,-120 -85,-126 -85,-132 -85,-138 -85,-144 -85,-150 -85,-156 -85,-162 -85,-168 -85,-174 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -85,180 -84.5,180 -84,180 -83.5,180 -83,180 -82.5,180 -82,180 -81.5,180 -81,180 -80.5,180 -80,180 -80,180 -80,180 -80,180 -80,180 -80,180 -80,180 -80,180 -80,180 -80,-180 -80))"] |
|
CATS2008: Circum-Antarctic Tidal Simulation version 2008
|
9896041 1443677 |
2019-12-19 | Howard, Susan L.; Padman, Laurence; Erofeeva, Svetlana |
Collaborative Research: Uncovering the Ross Ocean and Ice Shelf Environment and Tectonic setting Through Aerogeophysical Surveys and Modeling (ROSETTA-ICE) Ocean Tides around Antarctica and in the Southern Ocean |
CATS2008 is a regional inverse barotropic tide model for the circum-Antarctic ocean on a 4 km grid. The model domain includes ocean cavities under the floating ice shelves. The coastline is based on the MODIS MOA [Scambos et al., 2007; Remote Sensing of Environment] feature identification files, adjusted to match ICESat-derived grounding lines for the Ross and Filchner-Ronne ice shelves and Interferometric Synthetic Aperture Radar (InSAR) grounding lines. The water depth map for open water is based on the 2007 release update to Smith and Sandwell [1997; Science]. Adjustments to this map have been made in various regions, including the open continental shelf in front of the Larsen-C Ice Shelf which has been blended with GEBCO bathymetry. Model type: Tides only; Inverse (data assimilation); barotropic (no vertical variation of currents). Grid: 4-km uniform polar stereographic (centered at 71 degrees S, 70 degrees W) Constituents: M2, S2, N2, K2, K1, O1, P1, Q1, Mf, Mm. Units: z (sea surface height; meters); u,v (currents; cm/s); U,V (transports; m2/s). Coordinates: Currents (u, v) and depth-integrated transports (U, V) are given as East (u, U) and North (v, V) components. Citation: "… an update to the inverse model described by Padman et al. [2002]." See CATS2008_README.pdf for further details. | ["POLYGON((-180 -40.231,-144 -40.231,-108 -40.231,-72 -40.231,-36 -40.231,0 -40.231,36 -40.231,72 -40.231,108 -40.231,144 -40.231,180 -40.231,180 -45.2079,180 -50.1848,180 -55.1617,180 -60.1386,180 -65.1155,180 -70.0924,180 -75.0693,180 -80.0462,180 -85.0231,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -85.0231,-180 -80.0462,-180 -75.0693,-180 -70.0924,-180 -65.1155,-180 -60.1386,-180 -55.1617,-180 -50.1848,-180 -45.2079,-180 -40.231))"] |
|
Amino acid nitrogen isotope values of penguins from the Antarctic Peninsula region 1930s to 2010s
|
1443424 1443585 1443386 1826712 |
2019-12-17 | McMahon, Kelton; Polito, Michael |
Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators |
This data set contains measurements of nitrogen (δ15N) stable isotope values of twelve individual amino acids from breast feathers of gentoo penguins (Pygoscelis papua) and chinstrap penguins (Pygoscelis antarctica) collected from museum archives between the 1930s and 2010s. Stable isotope analyses were conducted using a gas chromatograph coupled to a continuous flow stable isotope ratio mass spectrometer. The data set also includes trophic positions of penguins calculated from individual amino acid δ15N values. The data set indexes each individual penguin with species, collection institution, catalog number, sex, locality, latitude, longitude, year of sample collection, nitrogen isotope ratios, and calculated trophic position. Details of the data set and all relevant methods are provided in McMahon et al. 2020 Proc Natl Acad Sci DOI: 10.1073/pnas.1913093116 | ["POLYGON((-63.56 -60.72,-61.664 -60.72,-59.768 -60.72,-57.872 -60.72,-55.976 -60.72,-54.08 -60.72,-52.184 -60.72,-50.288 -60.72,-48.392 -60.72,-46.496 -60.72,-44.6 -60.72,-44.6 -61.106,-44.6 -61.492,-44.6 -61.878,-44.6 -62.264,-44.6 -62.65,-44.6 -63.036,-44.6 -63.422,-44.6 -63.808,-44.6 -64.194,-44.6 -64.58,-46.496 -64.58,-48.392 -64.58,-50.288 -64.58,-52.184 -64.58,-54.08 -64.58,-55.976 -64.58,-57.872 -64.58,-59.768 -64.58,-61.664 -64.58,-63.56 -64.58,-63.56 -64.194,-63.56 -63.808,-63.56 -63.422,-63.56 -63.036,-63.56 -62.65,-63.56 -62.264,-63.56 -61.878,-63.56 -61.492,-63.56 -61.106,-63.56 -60.72))"] |
|
South Pole CH4 data for termination
|
1443464 |
2019-12-11 | Sowers, Todd A. |
Collaborative Research: Inert Gas and Methane Based Climate Records throughout the South Pole Deep Ice Core |
The overiding goal for our collaborative project is to provide the necessary data to construct an accurate gas age scale all along the SPICE core. Downcore measurements of CH4 and other species would help to constrain the ice age - gas age difference all along the core that is a prerequisite for the construction of the gas age vs depth profile that is the backbone for all atmospheric reconstructions. | ["POINT(0 -90)"] |
|
South Pole ice core total air content
|
1443464 |
2019-12-11 | Sowers, Todd A. |
Collaborative Research: Inert Gas and Methane Based Climate Records throughout the South Pole Deep Ice Core |
The total air content in ice core samples are a fundamental indication of the multitude of processes that impact densification of snow in polar regions. In addition, variations in the elevation of the ice sheet directly control the pressure in the bubble close off region and thereby the total gas content. Attempts to remove the physical factors (temperature, accumulation rate, dust content, seasonality) impacting the total air content could provide a means of assessing variations in the elevation of the South Pole over the last 50,000 years. | ["POINT(0 -90)"] |
|
Aerial survey of Explorers Cove shoreline, late January 2005
|
1341612 |
2019-12-05 | Bowser, Samuel; Alexander, Steve |
Assembling and Mining the Genomes of Giant Antarctic Foraminifera |
Photographs taken from helo operating at 500 ft of the shoreline bounding Explorers Cove in late January, illustrating typical sea ice conditions, extent of shoreline moat, ephemeral snow melt input, nearshore small ponds and tide pools, Commonwealth and Wales Glacier deltas, evaporite deposits, and landslides along the northern/northeastern slopes of Mount Barnes. | ["POINT(163.5117 -77.57623)"] |
|
Ross Sea post-middle Miocene seismic interpretation
|
1043700 |
2019-11-24 | Harry, Dennis L. |
Geodynamic Models of Subsidence and Lithospheric Flexure at the ANDRILL Drill Sites: Implications for Cenozoic Tectonics and Ice Sheet History |
Interpretation of major post-middle Miocene seismic reflections in the Ross Sea are provided in i) ASCII files containing Line, Trace, X, Y, and TWTT (two-way travel) picks and ii) netcdf grid files of structure and isochore maps in two-way travel time and depth or thickness. Data are in the Antarctic Polar Stereographic projection. | ["POLYGON((-180 -70,-176.5 -70,-173 -70,-169.5 -70,-166 -70,-162.5 -70,-159 -70,-155.5 -70,-152 -70,-148.5 -70,-145 -70,-145 -71,-145 -72,-145 -73,-145 -74,-145 -75,-145 -76,-145 -77,-145 -78,-145 -79,-145 -80,-148.5 -80,-152 -80,-155.5 -80,-159 -80,-162.5 -80,-166 -80,-169.5 -80,-173 -80,-176.5 -80,180 -80,177.5 -80,175 -80,172.5 -80,170 -80,167.5 -80,165 -80,162.5 -80,160 -80,157.5 -80,155 -80,155 -79,155 -78,155 -77,155 -76,155 -75,155 -74,155 -73,155 -72,155 -71,155 -70,157.5 -70,160 -70,162.5 -70,165 -70,167.5 -70,170 -70,172.5 -70,175 -70,177.5 -70,-180 -70))"] |
|
Cosmogenic nuclide data from glacial deposits along the Liv Glacier coast
|
1443346 |
2019-11-21 | Stone, John |
Collaborative Research: High-resolution Reconstruction of Holocene Deglaciation in the Southern Ross Embayment |
This data set contains measurements of cosmic-ray-produced Be-10 in quartz from glacial erratics and bedrock at sites along and adjacent to Liv Glacier and Amundsen Glacier in the southern Transantarctic Mountains. Samples were collected during the 2016-17 and 2017-18 field seasons working from remote camps along the coast. Locations were determined by hand-held GPS. Elevations are based on barometric altimetry corrected for daily drift and referenced to precise (geodetic) GPS benchmarks established over a range of altitudes at each site. Horizon geometry and the resulting topographic shielding of the cosmic ray flux was determined from vertically-oriented full-sky (fisheye) photographs at each sample location. Samples were processed at the University of Washington Cosmogenic Nuclide Laboratory using established procedures for mineral separation, dissolution, beryllium extraction and purification, described at http://depts.washington.edu/cosmolab/chem.shtml. Beryllium isotope ratios were measured at the Lawrence Livermore Center for Accelerator Mass Spectrometry (LLNL-CAMS) relative to the KNSTD-Be-01-5-4 standard, assuming a standard Be-10/Be-9 ratio of 2.851E-12 (07KNSTD normalization). Data are reported as input for the online CRONUS cosmogenic nuclide calculator (V3, current at the time of submission in November 2019). Exposure ages can be obtained by entering the data into the CRONUS calculator, at: http://hess.ess.washington.edu/math/v3/v3_age_in.html . Data for each sample consists of two lines of input parameters, as follows: {Sample_name, Latitude (DD), Longitude (DD), Altitude (m asl), Scaling_function, Thickness (cm), Density (g/cm^3), Horizon_correction, Erosion_rate (cm/yr), Year_sampled} {Sample_name, Nuclide (in this case Be-10), Target_mineral (quartz), Be-10_concentration (atom/g), Error_Be-10_concentration (atom/g), Normalization} Further information about the V3 input format is given at: http://hess.ess.washington.edu/math/docs/v3/v3_input_explained.html | ["POLYGON((-174 -84.5,-172.4 -84.5,-170.8 -84.5,-169.2 -84.5,-167.6 -84.5,-166 -84.5,-164.4 -84.5,-162.8 -84.5,-161.2 -84.5,-159.6 -84.5,-158 -84.5,-158 -84.63,-158 -84.76,-158 -84.89,-158 -85.02,-158 -85.15,-158 -85.28,-158 -85.41,-158 -85.54,-158 -85.67,-158 -85.8,-159.6 -85.8,-161.2 -85.8,-162.8 -85.8,-164.4 -85.8,-166 -85.8,-167.6 -85.8,-169.2 -85.8,-170.8 -85.8,-172.4 -85.8,-174 -85.8,-174 -85.67,-174 -85.54,-174 -85.41,-174 -85.28,-174 -85.15,-174 -85.02,-174 -84.89,-174 -84.76,-174 -84.63,-174 -84.5))"] |
|
Biogenic silica concentrations from the Ross Sea
|
1644073 |
2019-11-13 | Ditullio, Giacomo; Schanke, Nicole |
Collaborative Research: Cobalamin and Iron Co-Limitation Of Phytoplankton Species in Terra Nova Bay |
Biogenic silica concentrations collected from CTD casts during RVIB Nathaniel B. Palmer cruise in the Ross Sea, Southern Ocean from December 2017-February 2018 | ["POLYGON((-180 -72.45,-179.354 -72.45,-178.708 -72.45,-178.062 -72.45,-177.416 -72.45,-176.77 -72.45,-176.124 -72.45,-175.478 -72.45,-174.832 -72.45,-174.186 -72.45,-173.54 -72.45,-173.54 -73.068,-173.54 -73.686,-173.54 -74.304,-173.54 -74.922,-173.54 -75.54,-173.54 -76.158,-173.54 -76.776,-173.54 -77.394,-173.54 -78.012,-173.54 -78.63,-174.186 -78.63,-174.832 -78.63,-175.478 -78.63,-176.124 -78.63,-176.77 -78.63,-177.416 -78.63,-178.062 -78.63,-178.708 -78.63,-179.354 -78.63,180 -78.63,179.818 -78.63,179.636 -78.63,179.454 -78.63,179.272 -78.63,179.09 -78.63,178.908 -78.63,178.726 -78.63,178.544 -78.63,178.362 -78.63,178.18 -78.63,178.18 -78.012,178.18 -77.394,178.18 -76.776,178.18 -76.158,178.18 -75.54,178.18 -74.922,178.18 -74.304,178.18 -73.686,178.18 -73.068,178.18 -72.45,178.362 -72.45,178.544 -72.45,178.726 -72.45,178.908 -72.45,179.09 -72.45,179.272 -72.45,179.454 -72.45,179.636 -72.45,179.818 -72.45,-180 -72.45))"] |
|
Updated (2017) bubble number-density, size, shape, and modeled paleoclimate data
|
1043528 0539578 |
2019-11-12 | Fegyveresi, John; Alley, Richard; Spencer, Matthew; Fitzpatrick, Joan; Voigt, Donald E. |
Collaborative Research: Physical Properties of the WAIS Divide Deep Core Collaborative Research: Continued Study of Physical Properties of the WAIS Divide Deep Core |
This data set includes the fully updated (2017) bubble number-density measured at depths from 120 meters down to 1600 meters at 20-meter intervals in both horizontal and vertical samples. The data set also includes modeled temperature reconstructions based on the model developed by Spencer and others (2006) and Fegyveresi and others (2011). Data also includes tabs for bubble size and shape data. | ["POINT(-112.3 -79.43333333)"] |
|
Laser Dust Logging of the South Pole Ice Core (SPICE)
|
1443566 |
2019-11-03 | Bay, Ryan |
Laser Dust Logging of a South Pole Ice Core |
We deployed an oriented laser dust logger in the SPICEcore borehole in order to study the particulate stratigraphy, volcanology, glaciology and climatology of South Pole. We obtained a detailed record of dust and ash, SPICEcore age versus depth, and measurements of the optical anisotropy indicated by IceCube analyses. | ["POINT(0 -90)"] |
|
South Pole Ice Core (SPICEcore) SPC14 Core Quality Versus Depth
|
1141839 1142646 1142517 |
2019-10-30 | Souney, Joseph Jr.; Twickler, Mark; Fegyveresi, John; Casey, Kimberly A.; Aydin, Murat; Steig, Eric J.; Nunn, Richard; Hargreaves, Geoff; Fudge, T. J.; Nicewonger, Melinda R.; Kahle, Emma |
Collaborative Research: A 1500m Ice Core from South Pole |
Qualitative assessment of ice-core quality versus depth for the South Pole ice core SPC14. The depths and core quality ratings presented here are from the field observations made at South Pole, Antarctica, during the course of the drilling of the ice core and also from the lab observations at the NSF-Ice Core Facility in Lakewood, Colorado. Depths are in meters. Core quality ratings were defined are as follows. Excellent: 0–1 breaks/no fractures; Very Good: 0–2 breaks/90% no fractures; Good: 0–3 breaks/50% no fractures; Fair: >10 cm without fractures; Poor: >10 cm without through fractures; Very Poor: <10 cm without through fractures. | ["POINT(90 -90)"] |
|
Diatom Oxygen Isotope Evidence of Pliocene (~4.68 to 3.44 Ma) Antarctic Ice Sheet Dynamics and Ross Sea Paleoceanography
|
1443420 |
2019-10-27 | Dodd, Justin; Abbott, Tirzah |
Diatom and Oxygen Isotope Evidence of Pliocene Antarctic Ice Sheet Dynamics and Ross Sea Paleoceanography |
The Andrill-1B (AND-1B) sediment core from under the Ross Ice Shelf in McMurdo Sound, Antarctica, recovered a mid to late Pliocene (~4.68 to 3.44 Ma) age diatomite unit with d18Odiatom values that range from +32.6 to +37.6 ‰ (n=50 | ["POINT(167.083333 -77.888889)"] |
|
Sea ice and chlorophyll concentrations in Antarctic coastal polynyas and seasonal ice zones
|
1341558 |
2019-10-22 | Ji, Rubao |
Collaborative Research: Phytoplankton Phenology in the Antarctic: Drivers, Patterns, and Implications for the Adelie Penguin |
The dataset includes 1) sea ice concentrations in Antarctic coastal polynyas (1979-2015) and seasonal ice zones (1978-2019); 2) chlorophyll concentrations in Antarctic coastal polynyas (1997-2015) and seasonal ice zones (1997-2019). The sea ice dataset is a tailored product after processing a global-scale sea ice data product managed by National Snow and Ice Data Center. The chlorophyll dataset is a tailored product after processing a global-scale ocean color dataset produced by GLOBCOLOUR, the European Service for Ocean Colour | ["POLYGON((-180 -45,-144 -45,-108 -45,-72 -45,-36 -45,0 -45,36 -45,72 -45,108 -45,144 -45,180 -45,180 -48.4,180 -51.8,180 -55.2,180 -58.6,180 -62,180 -65.4,180 -68.8,180 -72.2,180 -75.6,180 -79,144 -79,108 -79,72 -79,36 -79,0 -79,-36 -79,-72 -79,-108 -79,-144 -79,-180 -79,-180 -75.6,-180 -72.2,-180 -68.8,-180 -65.4,-180 -62,-180 -58.6,-180 -55.2,-180 -51.8,-180 -48.4,-180 -45))"] |
|
Last Interglacial Mean Ocean Temperature
|
1245821 1245659 1246148 |
2019-10-18 | Shackleton, Sarah |
Collaborative Research: The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive |
Noble gas data from Taylor Glacier and EPICA Dome C (EDC) for mean ocean temperature reconstruction during the Last Interglacial. Also includes trace gas measurements of d18Oatm, CO2, and CH4 from Taylor Glacier from chronology construction. | ["POLYGON((123.3 -75.1,127.138 -75.1,130.976 -75.1,134.814 -75.1,138.652 -75.1,142.49 -75.1,146.328 -75.1,150.166 -75.1,154.004 -75.1,157.842 -75.1,161.68 -75.1,161.68 -75.367,161.68 -75.634,161.68 -75.901,161.68 -76.168,161.68 -76.435,161.68 -76.702,161.68 -76.969,161.68 -77.236,161.68 -77.503,161.68 -77.77,157.842 -77.77,154.004 -77.77,150.166 -77.77,146.328 -77.77,142.49 -77.77,138.652 -77.77,134.814 -77.77,130.976 -77.77,127.138 -77.77,123.3 -77.77,123.3 -77.503,123.3 -77.236,123.3 -76.969,123.3 -76.702,123.3 -76.435,123.3 -76.168,123.3 -75.901,123.3 -75.634,123.3 -75.367,123.3 -75.1))"] |
|
Automatic Weather Station Pine Island Glacier
|
0732869 1739003 |
2019-10-15 | Mojica Moncada, Jhon F.; Holland, David |
Collaborative Research; IPY: Ocean-Ice Interaction in the Amundsen Sea sector of West Antarctica |
Automatic Weather Station, located on Pine Island Glacier. Data set from 2008-2015. | ["POLYGON((-100 -75,-99.9 -75,-99.8 -75,-99.7 -75,-99.6 -75,-99.5 -75,-99.4 -75,-99.3 -75,-99.2 -75,-99.1 -75,-99 -75,-99 -75.05,-99 -75.1,-99 -75.15,-99 -75.2,-99 -75.25,-99 -75.3,-99 -75.35,-99 -75.4,-99 -75.45,-99 -75.5,-99.1 -75.5,-99.2 -75.5,-99.3 -75.5,-99.4 -75.5,-99.5 -75.5,-99.6 -75.5,-99.7 -75.5,-99.8 -75.5,-99.9 -75.5,-100 -75.5,-100 -75.45,-100 -75.4,-100 -75.35,-100 -75.3,-100 -75.25,-100 -75.2,-100 -75.15,-100 -75.1,-100 -75.05,-100 -75))"] |
|
Plocamium cartilagineum field chemotyping
|
1341339 |
2019-10-09 | Baker, Bill |
Collaborative Research: The Chemical Ecology of Shallow-water Marine Macroalgae and Invertebrates on the Antarctic Peninsula - continuing |
Samples of the red alga Plocamium cartilagineum were collected from the area around Palmer Station, Antarctica, and characterized by gas chromatography for their secondary metabolite content. Patterns in secondary metabolite content were used to establish chemical phenotypes (chemotypes). | ["POLYGON((-64.03 -64.254,-64.0286 -64.254,-64.0272 -64.254,-64.0258 -64.254,-64.0244 -64.254,-64.023 -64.254,-64.0216 -64.254,-64.0202 -64.254,-64.0188 -64.254,-64.0174 -64.254,-64.016 -64.254,-64.016 -64.2543,-64.016 -64.2546,-64.016 -64.2549,-64.016 -64.2552,-64.016 -64.2555,-64.016 -64.2558,-64.016 -64.2561,-64.016 -64.2564,-64.016 -64.2567,-64.016 -64.257,-64.0174 -64.257,-64.0188 -64.257,-64.0202 -64.257,-64.0216 -64.257,-64.023 -64.257,-64.0244 -64.257,-64.0258 -64.257,-64.0272 -64.257,-64.0286 -64.257,-64.03 -64.257,-64.03 -64.2567,-64.03 -64.2564,-64.03 -64.2561,-64.03 -64.2558,-64.03 -64.2555,-64.03 -64.2552,-64.03 -64.2549,-64.03 -64.2546,-64.03 -64.2543,-64.03 -64.254))"] |
|
Pirrit Hills subglacial bedrock core RB-2, cosmogenic Be-10, Al-26 data
|
1341728 |
2019-10-09 | Stone, John |
EXPROBE-WAIS: Exposed Rock Beneath the West Antarctic Ice Sheet, A Test for Interglacial Ice Sheet Collapse |
This data set contains measurements of cosmic-ray-produced Be-10 and Al-26 in quartz from the RB-2 core, recovered from bedrock at a depth of 150 m below the West Antarctic Ice Sheet surface in the Pirrit Hills. The core site is located at latitude S81.09948, longitude W85.15694. Core length is approximately 8 meters. Lithology is A-type granite, similar in composition to bedrock exposed on nearby Harter Nunatak and other mountains in the Pirrit Hills (Lee et al. Geosci. J. 16, 421-433). Samples were processed at the University of Washington Cosmogenic Nuclide Laboratory. Chemical processing and purification methods are described at http://depts.washington.edu/cosmolab/chem.shtml. Beryllium isotope ratios were measured at the Lawrence Livermore Center for Accelerator Mass Spectrometry (LLNL-CAMS) relative to the KNSTD-Be-01-5-4 standard, assuming a standard Be-10/Be-9 ratio of 2.851E-12 (07KNSTD normalization). Aluminum isotope ratios were measured at PRIME Lab, Purdue University, relative to the KNSTD-Al-01-5-2 standard, assuming a standard Al-26/Al-27 ratio of 1.818E-12 (KNSTD normalization). Uncertainties are 1-sigma and include full AMS errors and all known sources of laboratory uncertainty. | ["POLYGON((-86.3 -81,-86.17 -81,-86.04 -81,-85.91 -81,-85.78 -81,-85.65 -81,-85.52 -81,-85.39 -81,-85.26 -81,-85.13 -81,-85 -81,-85 -81.03,-85 -81.06,-85 -81.09,-85 -81.12,-85 -81.15,-85 -81.18,-85 -81.21,-85 -81.24,-85 -81.27,-85 -81.3,-85.13 -81.3,-85.26 -81.3,-85.39 -81.3,-85.52 -81.3,-85.65 -81.3,-85.78 -81.3,-85.91 -81.3,-86.04 -81.3,-86.17 -81.3,-86.3 -81.3,-86.3 -81.27,-86.3 -81.24,-86.3 -81.21,-86.3 -81.18,-86.3 -81.15,-86.3 -81.12,-86.3 -81.09,-86.3 -81.06,-86.3 -81.03,-86.3 -81))"] |
|
Antarctic topographic and subglacial lake geostatistical simulations
|
1745137 |
2019-10-02 | MacKie, Emma; Schroeder, Dustin; Caers, Jef; Siegfried, Matt; Scheidt, Celine |
CAREER: Cross-Instrument Synthesis of Antarctic Radar Sounding Observations |
These data accompany the paper "Antarctic Topographic Realizations and Geostatistical Modeling Used to Map Subglacial Lakes" (MacKie et al., in review). This dataset contains 100 geostatistically generated subglacial topographic realizations for Antarctica. Data science techniques were used to calculate the probability of the occurrence of radar-detected lakes and altimetry-detected (active) lakes across the continent, using each topographic realization as a parameter. This generated 100 probability maps of the likelihood of radar-detected lake occurrence and 100 probability maps of active lake occurrence. Further statistics were used to generate 100 binary maps showing expected radar-detected lake locations. The ensemble of realizations can be used for uncertainty quantification. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Radiocarbon dates from pygoscelid penguin tissues excavated at Stranger Point, King George Island, Antarctic Peninsula
|
1826712 1443585 1443424 1443386 |
2019-09-24 | Emslie, Steven |
Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators |
Radiocarbon dates from pygoscelid penguin tissues from ornithogenic soils and beach deposits at Stranger Point, King George (25 de Mayo) Island, Antarctic Peninsula. Uncorrected dates are in radiocarbon years before present (BP); calibrated dates were corrected for the marine carbon reservoir effect (delta R = 700 +/- 50 years) and calibrated with Calib 7.0.4 to provide 2σ ranges in calendar years BP. All dates except were completed at the Woods Hole National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility and are designated with OS numbers. Localities include ancient penguin breedings sites (mounds, M), active colonies (I9, B3), and a mid-Holocene marine beach deposit (Pingfo 1). | ["POLYGON((-59 -62,-58.9 -62,-58.8 -62,-58.7 -62,-58.6 -62,-58.5 -62,-58.4 -62,-58.3 -62,-58.2 -62,-58.1 -62,-58 -62,-58 -62.1,-58 -62.2,-58 -62.3,-58 -62.4,-58 -62.5,-58 -62.6,-58 -62.7,-58 -62.8,-58 -62.9,-58 -63,-58.1 -63,-58.2 -63,-58.3 -63,-58.4 -63,-58.5 -63,-58.6 -63,-58.7 -63,-58.8 -63,-58.9 -63,-59 -63,-59 -62.9,-59 -62.8,-59 -62.7,-59 -62.6,-59 -62.5,-59 -62.4,-59 -62.3,-59 -62.2,-59 -62.1,-59 -62))"] |
|
Easten Antarctic Peninsula Surface Sediment Diatom Data
|
9714371 0732625 |
2019-09-16 | Leventer, Amy |
Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans |
Diatom data from eastern side of Antarctic Peninsula: This file includes quantitative diatom data for surface samples collected on numerous cruises to the eastern side of the Antarctic Peninsula, including NBP0003, NBP0107, LMG0502, NBP0603, and NBP1203. Samples were collected using a variety of tools including Smith-McIntyre Grab, Kasten Core and Jumbo Kasten Core. These data were generated by Amy Leventer (aleventer@colgate.edu) and undergraduate students at Colgate University. All questions regarding the specifics of these data should be directed to Amy Leventer. Quantitative diatom slides were prepared according to the settling technique of Scherer (1995). Cover slips were adhered to the slides using Norland Optical Adhesive #61. Slides were observed under Olympus CX31, BX50 and BX60, and Zeiss Primo Star light microscopes, using a 100X oil immersion objective for a total magnification of 1000X. A minimum of 400 valves or 10 transects was counted for each slide, depending on the absolute diatom abundance. Valves were only counted if >50% complete. Diatoms were identified to species level when possible (Crosta et al., 2005; Armand et al., 2005; Cefarelli et al., 2010). Armand, L.K., X. Crosta, O. Romero, J. J. Pichon (2005), The biogeography of major diatom taxa in Southern Ocean sediments: 1. Sea ice related species, Paleogeography, Paleoclimatology, Paleoecology, 223, 93-126. Cefarelli, A.O., M. E. Ferrario, G. O. Almandoz, A. G. Atencio, R. Akselman, M. Vernet (2010), Diversity of the diatom genus Fragilariopsis in the Argentine Sea and Antarctic waters: morphology, distribution and abundance, Polar Biology, 33(2), 1463-1484. Crosta, X., O. Romero, L. K. Armand, J. Pichon (2005), The biogeography of major diatom taxa in Southern Ocean sediments: 2. Open ocean related species, Palaeogeography, Palaeoclimatology, Palaeoecology, 223, 66-92. Scherer, R. P., A new method for the determination of absolute abundance of diatoms and other silt-sized sedimentary particles, J. Paleolimnol., 12, 171–178, 1995. | ["POLYGON((-64 -63,-63.1 -63,-62.2 -63,-61.3 -63,-60.4 -63,-59.5 -63,-58.6 -63,-57.7 -63,-56.8 -63,-55.9 -63,-55 -63,-55 -63.4,-55 -63.8,-55 -64.2,-55 -64.6,-55 -65,-55 -65.4,-55 -65.8,-55 -66.2,-55 -66.6,-55 -67,-55.9 -67,-56.8 -67,-57.7 -67,-58.6 -67,-59.5 -67,-60.4 -67,-61.3 -67,-62.2 -67,-63.1 -67,-64 -67,-64 -66.6,-64 -66.2,-64 -65.8,-64 -65.4,-64 -65,-64 -64.6,-64 -64.2,-64 -63.8,-64 -63.4,-64 -63))"] |
|
Carbon and nitrogen stable isotope values of Antarctic Krill from the South Shetland Islands and the northern Antarctic Peninsula 2007 and 2009
|
1443585 1443424 1826712 1443386 |
2019-09-13 | Polito, Michael |
Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators |
This data set contains measurements of carbon (δ13C) and nitrogen (δ15N) stable isotope values of whole-body Antarctic krill (Euphausia superba) collected from trawl surveys of waters surrounding the South Shetland Islands and the northern Antarctic Peninsula during the 2006-07 and 2008-90 Austral summers. Stable isotope analyses were conducted using an elemental analyzer coupled to a continuous flow stable isotope ratio mass spectrometer. Individual krill were lipid-extracted prior to analyses. The data set also includes latitude, longitude, month, and year of sample collection, standard length of the krill to the nearest mm, age class, sex, and carbon to nitrogen ratios. Details of the data set and all relevant methods are provided in Polito et al., 2013 and Polito et al., 2019. | ["POLYGON((-63 -60,-62.1 -60,-61.2 -60,-60.3 -60,-59.4 -60,-58.5 -60,-57.6 -60,-56.7 -60,-55.8 -60,-54.9 -60,-54 -60,-54 -60.4,-54 -60.8,-54 -61.2,-54 -61.6,-54 -62,-54 -62.4,-54 -62.8,-54 -63.2,-54 -63.6,-54 -64,-54.9 -64,-55.8 -64,-56.7 -64,-57.6 -64,-58.5 -64,-59.4 -64,-60.3 -64,-61.2 -64,-62.1 -64,-63 -64,-63 -63.6,-63 -63.2,-63 -62.8,-63 -62.4,-63 -62,-63 -61.6,-63 -61.2,-63 -60.8,-63 -60.4,-63 -60))"] |
|
Dynamic fine-scale sea-icescape shapes adult emperor penguin foraging habitat in East Antarctica
|
1643901 |
2019-09-10 | Labrousse, Sara; Fraser, Alexander; Tamura, Takeshi; Pinaud, David; Wienecke, Barbara; Kirkwood, Roger; Ropert-Coudert, Yan; Resinger, Ryan; Jonsen, Ian; Porter-Smith, Rick; Barbraud, Christophe; Bost, Charles-André; Ji, Rubao; Jenouvrier, Stephanie; Sumner, Michael |
Collaborative Research: Polynyas in Coastal Antarctica (PICA): Linking Physical Dynamics to Biological Variability |
The emperor penguin, an iconic species threatened by projected sea-ice loss in Antarctica, has long been considered to forage at the fast ice edge, presumably relying on large/yearly-persistent polynyas as their main foraging habitat during the breeding season. Using newly developed fine-scale sea-icescape data and historical penguin tracking data, this study for the first time suggests the importance of less-recognized small openings, including cracks, flaw leads and ephemeral short-term polynyas, as foraging habitats for emperor penguins. The tracking data retrieved from 47 emperor penguins in two different colonies in East Antarctica suggest that those penguins spent 23% of their time in ephemeral polynyas and did not use the large/yearly-persistent, well-studied polynyas, even they occur much more regularly with predictable locations. These findings challenge our previous understanding of emperor penguin breeding habitats, highlighting the need for incorporating fine-scale seascape features when assessing the population persistence in a rapidly changing polar environment. | ["POLYGON((55 -62,65 -62,75 -62,85 -62,95 -62,105 -62,115 -62,125 -62,135 -62,145 -62,155 -62,155 -62.8,155 -63.6,155 -64.4,155 -65.2,155 -66,155 -66.8,155 -67.6,155 -68.4,155 -69.2,155 -70,145 -70,135 -70,125 -70,115 -70,105 -70,95 -70,85 -70,75 -70,65 -70,55 -70,55 -69.2,55 -68.4,55 -67.6,55 -66.8,55 -66,55 -65.2,55 -64.4,55 -63.6,55 -62.8,55 -62))"] |
|
Liv and Amundsen Glacier Radiocarbon Data
|
1443248 |
2019-09-05 | Hall, Brenda |
Collaborative Research: High-resolution Reconstruction of Holocene Deglaciation in the Southern Ross Embayment |
["POLYGON((-170 -84,-168 -84,-166 -84,-164 -84,-162 -84,-160 -84,-158 -84,-156 -84,-154 -84,-152 -84,-150 -84,-150 -84.16,-150 -84.32,-150 -84.48,-150 -84.64,-150 -84.8,-150 -84.96,-150 -85.12,-150 -85.28,-150 -85.44,-150 -85.6,-152 -85.6,-154 -85.6,-156 -85.6,-158 -85.6,-160 -85.6,-162 -85.6,-164 -85.6,-166 -85.6,-168 -85.6,-170 -85.6,-170 -85.44,-170 -85.28,-170 -85.12,-170 -84.96,-170 -84.8,-170 -84.64,-170 -84.48,-170 -84.32,-170 -84.16,-170 -84))"] | |
|
Sea Ice Layer Cakes, PIPERS 2017
|
1341513 |
2019-08-30 | Mei, M. Jeffrey; Maksym, Edward; Jeffrey Mei, M. |
Collaborative Research: Seasonal Sea Ice Production in the Ross Sea, Antarctica |
Layer Cakes for the PIPERS ice stations 4, 7, 8 and 9 (05/24, 05/29, 05/31, 06/02) with snow depth (both raw and interpolated), surface lidar scan and ice draft AUV scan aligned onto a common 100m x 100m grid, binned at 0.2m resolution. | ["POLYGON((-180 -68,-179 -68,-178 -68,-177 -68,-176 -68,-175 -68,-174 -68,-173 -68,-172 -68,-171 -68,-170 -68,-170 -68.8,-170 -69.6,-170 -70.4,-170 -71.2,-170 -72,-170 -72.8,-170 -73.6,-170 -74.4,-170 -75.2,-170 -76,-171 -76,-172 -76,-173 -76,-174 -76,-175 -76,-176 -76,-177 -76,-178 -76,-179 -76,180 -76,179 -76,178 -76,177 -76,176 -76,175 -76,174 -76,173 -76,172 -76,171 -76,170 -76,170 -75.2,170 -74.4,170 -73.6,170 -72.8,170 -72,170 -71.2,170 -70.4,170 -69.6,170 -68.8,170 -68,171 -68,172 -68,173 -68,174 -68,175 -68,176 -68,177 -68,178 -68,179 -68,-180 -68))"] |
|
The South Pole Ice Core (SPICEcore) chronology and supporting data
|
1443336 |
2019-08-29 | Winski, Dominic A.; Fudge, T. J.; Iverson, Nels A.; Dunbar, Nelia; Buizert, Christo; Bay, Ryan; Souney, Joseph Jr.; Sigl, Michael; Osterberg, Erich C.; McConnell, Joseph; Fegyveresi, John; Cole-Dai, Jihong; Thundercloud, Zayta; Cox, Thomas S.; Kreutz, Karl; Epifanio, Jenna; Ortman, Nikolas; Brook, Edward J.; Beaudette, Ross; Severinghaus, Jeffrey; Sowers, Todd A.; Steig, Eric J.; Morris, Valerie; Kahle, Emma; Ferris, David G.; Aydin, Murat; Nicewonger, Melinda R.; Casey, Kimberly A.; Alley, Richard; Waddington, Edwin D.; Jones, Tyler R. |
Collaborative Research: South Pole Ice Core Chronology and Climate Records using Chemical and Microparticle Measurements |
The South Pole Ice Core (SPICEcore) was drilled in 2014-2016 to provide a detailed multi-proxy archive of paleoclimate conditions in East Antarctica during the Holocene and late Pleistocene. Interpretation of these records requires an accurate depth-age relationship. Here, we present the SP19 timescale for the age of the ice of SPICEcore. SP19 is synchronized to the WD2014 chronology from the West Antarctic Ice Sheet Divide (WAIS Divide) ice core using stratigraphic matching of 251 volcanic events. These events indicate an age of 54,302 +/- 519 years BP (before the year 1950) at the bottom of SPICEcore. Annual layers identified in sodium and magnesium ions to 11,341 BP were used to interpolate between stratigraphic volcanic tie points, yielding an annually-resolved chronology through the Holocene. Estimated timescale uncertainty during the Holocene is less than 18 years relative to WD2014, with the exception of the interval between 1800 to 3100 BP when uncertainty estimates reach +/- 25 years due to widely spaced volcanic tie points. Prior to the Holocene, uncertainties remain within 124 years relative to WD2014. Results show an average Holocene accumulation rate of 7.4 cm/yr (water equivalent). The time variability of accumulation rate is consistent with expectations for steady-state ice flow through the modern spatial pattern of accumulation rate. Time variations in nitrate concentration, nitrate seasonal amplitude, and δ15N of N2 in turn are as expected for the accumulation-rate variations. The highly variable yet well-constrained Holocene accumulation history at the site can help improve scientific understanding of deposition-sensitive climate proxies such as δ15N of N2 and photolyzed chemical compounds. | ["POINT(-180 -90)"] |
|
Algal pigment concentrations from the Ross Sea
|
1644073 |
2019-08-27 | Ditullio, Giacomo |
Collaborative Research: Cobalamin and Iron Co-Limitation Of Phytoplankton Species in Terra Nova Bay |
Algal pigment concentrations as measured by HPLC from RV/IB Nathaniel B. Palmer cruise in the Ross Sea from 2017-2018 | ["POLYGON((-180 -72.448188333,-179.35369 -72.448188333,-178.70738 -72.448188333,-178.06107 -72.448188333,-177.41476 -72.448188333,-176.76845 -72.448188333,-176.12214 -72.448188333,-175.47583 -72.448188333,-174.82952 -72.448188333,-174.18321 -72.448188333,-173.5369 -72.448188333,-173.5369 -73.0663094997,-173.5369 -73.6844306664,-173.5369 -74.3025518331,-173.5369 -74.9206729998,-173.5369 -75.5387941665,-173.5369 -76.1569153332,-173.5369 -76.7750364999,-173.5369 -77.3931576666,-173.5369 -78.0112788333,-173.5369 -78.6294,-174.18321 -78.6294,-174.82952 -78.6294,-175.47583 -78.6294,-176.12214 -78.6294,-176.76845 -78.6294,-177.41476 -78.6294,-178.06107 -78.6294,-178.70738 -78.6294,-179.35369 -78.6294,180 -78.6294,179.818135 -78.6294,179.63627 -78.6294,179.454405 -78.6294,179.27254 -78.6294,179.090675 -78.6294,178.90881 -78.6294,178.726945 -78.6294,178.54508 -78.6294,178.363215 -78.6294,178.18135 -78.6294,178.18135 -78.0112788333,178.18135 -77.3931576666,178.18135 -76.7750364999,178.18135 -76.1569153332,178.18135 -75.5387941665,178.18135 -74.9206729998,178.18135 -74.3025518331,178.18135 -73.6844306664,178.18135 -73.0663094997,178.18135 -72.448188333,178.363215 -72.448188333,178.54508 -72.448188333,178.726945 -72.448188333,178.90881 -72.448188333,179.090675 -72.448188333,179.27254 -72.448188333,179.454405 -72.448188333,179.63627 -72.448188333,179.818135 -72.448188333,-180 -72.448188333))"] |
|
Elemental and isotopic composition of heavy noble gases in Allan Hills ice cores
|
1443263 |
2019-08-14 | Yan, Yuzhen; Bender, Michael; Higgins, John; Ng, Jessica; Severinghaus, Jeffrey P. |
Collaborative Research: Window into the World with 40,000-year Glacial Cycles from Climate Records in Million Year-old Ice from the Allan Hills Blue Ice Area |
This file includes argon isotope composition and xenon-to-krypton ratios measured in Allan Hills ice cores. | ["POINT(159.35507 -76.73286)"] |
|
Elemental and isotopic composition of nitrogen, oxygen, and argon in Allan Hills ice cores
|
1443263 |
2019-08-14 | Yan, Yuzhen; Bender, Michael; Higgins, John |
Collaborative Research: Window into the World with 40,000-year Glacial Cycles from Climate Records in Million Year-old Ice from the Allan Hills Blue Ice Area |
This file includes the d15N, O2/N2 ratio, Ar/N2 ratio, and d18O of O2 (d18Oatm) in Allan Hills ice cores (ALHIC1502 and ALHIC1503). | ["POINT(159.35507 -76.73286)"] |
|
Methane concentration in Allan Hills ice cores
|
1443263 |
2019-08-14 | Yan, Yuzhen; Bender, Michael; Brook, Edward J.; Higgins, John |
Collaborative Research: Window into the World with 40,000-year Glacial Cycles from Climate Records in Million Year-old Ice from the Allan Hills Blue Ice Area |
This file includes the concentration methane (CH4) in Allan Hills ice cores (ALHIC1502 and ALHIC1503). | ["POINT(159.35507 -76.73286)"] |
|
Carbon dioxide concentration and its stable carbon isotope composition in Allan Hills ice cores
|
1443263 |
2019-08-14 | Yan, Yuzhen; Bender, Michael; Brook, Edward J.; Higgins, John |
Collaborative Research: Window into the World with 40,000-year Glacial Cycles from Climate Records in Million Year-old Ice from the Allan Hills Blue Ice Area |
This file includes the concentration of carbon dioxide (CO2) and methane (CH4) and the stable carbon isotope composition of CO2 in Allan Hills ice cores (ALHIC1502 and ALHIC1503). | ["POINT(159.35507 -76.73286)"] |
|
Yoyo camera survey transects, King George Island and Bransfield Strait
|
1822256 |
2019-08-12 | Smith, Craig; Ziegler, Amanda |
RAPID: Collaborative Research: Marine Ecosystem Response to the Larsen C Ice-Shelf Breakout: "Time zero" |
The dataset provides metadata for towed yoyo camera survey transects conducted in Maxwell Bay, Marion Cove (King George Island) and the Bransfield Strait. Starting and ending positions, ship headings, bottom depth and number of photographs collected are provided. In all photographs, lasers are 10 cm apart for scale. Data were collected aboard the Korean Polar Research Institute icebreaker Araon. | ["POLYGON((-65.2349 -61.4275,-64.04392 -61.4275,-62.85294 -61.4275,-61.66196 -61.4275,-60.47098 -61.4275,-59.28 -61.4275,-58.08902 -61.4275,-56.89804 -61.4275,-55.70706 -61.4275,-54.51608 -61.4275,-53.3251 -61.4275,-53.3251 -61.80824,-53.3251 -62.18898,-53.3251 -62.56972,-53.3251 -62.95046,-53.3251 -63.3312,-53.3251 -63.71194,-53.3251 -64.09268,-53.3251 -64.47342,-53.3251 -64.85416,-53.3251 -65.2349,-54.51608 -65.2349,-55.70706 -65.2349,-56.89804 -65.2349,-58.08902 -65.2349,-59.28 -65.2349,-60.47098 -65.2349,-61.66196 -65.2349,-62.85294 -65.2349,-64.04392 -65.2349,-65.2349 -65.2349,-65.2349 -64.85416,-65.2349 -64.47342,-65.2349 -64.09268,-65.2349 -63.71194,-65.2349 -63.3312,-65.2349 -62.95046,-65.2349 -62.56972,-65.2349 -62.18898,-65.2349 -61.80824,-65.2349 -61.4275))"] |
|
Gas and Dust Measurements for Taylor Glacier and Taylor Dome Ice Cores
|
1245659 1246148 1245821 |
2019-08-12 | Menking, James; Brook, Edward J.; Marcott, Shaun; Barker, Stephen; Shackleton, Sarah; Severinghaus, Jeffrey; Dyonisius, Michael; Petrenko, Vasilii; McConnell, Joseph; Rhodes, Rachel; Bauska, Thomas; Baggenstos, Daniel |
Collaborative Research: The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive |
New ice cores retrieved from the Taylor Glacier (Antarctica) blue ice area contain ice and air spanning the Marine Isotope Stage (MIS) 5-4 transition, a period of global cooling and ice sheet expansion. We determine chronologies for the ice and air bubbles in the new ice cores by visually matching variations in gas- and ice- phase tracers to preexisting ice core records. The chronologies reveal an ice age-gas age difference (Δage) approaching 10 ka during MIS 4, implying very low snow accumulation in the Taylor Glacier accumulation zone. A revised chronology for the analagous section of the Taylor Dome ice core (84 to 55 ka), located to the south of the Taylor Glacier accumulation zone, shows that Δage did not exceed 3 ka. The difference in Δage between the two records during MIS 4 is similar in magnitude but opposite in direction to what is observed at the Last Glacial Maximum. This relationship implies that a spatial gradient in snow accumulation existed across the Taylor Dome region during MIS 4 that was oriented in the opposite direction of the accumulation gradient during the Last Glacial Maximum. | ["POINT(162.167 -77.733)"] |
|
SPICEcore Holocene CO2 and N2O data
|
1443550 |
2019-08-08 | Brook, Edward J. |
Controls on Variations in Atmospheric Carbon Dioxide and Nitrous Oxide During the Last 10,000 years |
Measurements of CO2, N2O, and the isotopic composition of CO2 from the Holocene section of SPICEcore | ["POINT(-180 -90)"] |
|
Noble Gas Data from recent ice in Antarctica for 86Kr problem
|
1543229 |
2019-08-02 | Severinghaus, Jeffrey; Shackleton, Sarah |
Collaborative research: Kr-86 as a proxy for barometric pressure variability and movement of the SH westerlies during the last
deglaciation |
This data comprises a survey of Recent ice from multiple sites in Antarctica using shallow ice cores to examine noble gas values in ice that nominally has the same Mean Ocean Temperature as today. The goal is to elucidate fractionation that occurs in the firn before air is trapped in bubbles in the ice, by making the assumption that the atmosphere noble gas content has not changed since this air was trappped. The ages of the air samples are typically early Industrial Revolution or late Holocene. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Andvord Bay sediment core data collected during the FjordEco project (LMG1510 and NBP1603)
|
1443680 |
2019-07-16 | Eidam, Emily; Nittrouer, Charles; Homolka, Khadijah; Smith, Craig |
Collaborative Research: Fjord Ecosystem Structure and Function on the West Antarctic Peninsula - Hotspots of Productivity and Biodiversity? (FjordEco) |
This dataset includes Pb-210 activities, grain-size distributions, and x-radiograph negatives for cores collected primarily during NBP1603 (and also LMG1510) as part of the FjordEco project in Andvord Bay and surrounding areas (Gerlache Strait, and Station B on the shelf). Data are from subsampled intervals of kasten cores and box cores, as well as one megacore. Samples were x-rayed, sliced, and bagged onboard the vessel. Grain-size and Pb-210 analyses were completed in the Sediment Dynamics Lab within the University of Washington School of Oceanography (PI C. Nittrouer). | ["POLYGON((-65.561 -64.6538,-65.2471 -64.6538,-64.9332 -64.6538,-64.6193 -64.6538,-64.3054 -64.6538,-63.9915 -64.6538,-63.6776 -64.6538,-63.3637 -64.6538,-63.0498 -64.6538,-62.7359 -64.6538,-62.422 -64.6538,-62.422 -64.67842,-62.422 -64.70304,-62.422 -64.72766,-62.422 -64.75228,-62.422 -64.7769,-62.422 -64.80152,-62.422 -64.82614,-62.422 -64.85076,-62.422 -64.87538,-62.422 -64.9,-62.7359 -64.9,-63.0498 -64.9,-63.3637 -64.9,-63.6776 -64.9,-63.9915 -64.9,-64.3054 -64.9,-64.6193 -64.9,-64.9332 -64.9,-65.2471 -64.9,-65.561 -64.9,-65.561 -64.87538,-65.561 -64.85076,-65.561 -64.82614,-65.561 -64.80152,-65.561 -64.7769,-65.561 -64.75228,-65.561 -64.72766,-65.561 -64.70304,-65.561 -64.67842,-65.561 -64.6538))"] |
|
SUMO unmanned aerial system (UAS) atmospheric data
|
1341606 |
2019-07-10 | Cassano, John |
Collaborative Research: Seasonal Sea Ice Production in the Ross Sea, Antarctica |
Atmospheric boundary layer temperature, humidity, pressure, and wind profile data collected with the Small Unmanned Meteorological Observer (SUMO) unmanned aerial system (UAS) during the NBP1704 PIPERS cruise. | ["POLYGON((-180 -71.088,-179.7593 -71.088,-179.5186 -71.088,-179.2779 -71.088,-179.0372 -71.088,-178.7965 -71.088,-178.5558 -71.088,-178.3151 -71.088,-178.0744 -71.088,-177.8337 -71.088,-177.593 -71.088,-177.593 -71.5318,-177.593 -71.9756,-177.593 -72.4194,-177.593 -72.8632,-177.593 -73.307,-177.593 -73.7508,-177.593 -74.1946,-177.593 -74.6384,-177.593 -75.0822,-177.593 -75.526,-177.8337 -75.526,-178.0744 -75.526,-178.3151 -75.526,-178.5558 -75.526,-178.7965 -75.526,-179.0372 -75.526,-179.2779 -75.526,-179.5186 -75.526,-179.7593 -75.526,180 -75.526,179.1926 -75.526,178.3852 -75.526,177.5778 -75.526,176.7704 -75.526,175.963 -75.526,175.1556 -75.526,174.3482 -75.526,173.5408 -75.526,172.7334 -75.526,171.926 -75.526,171.926 -75.0822,171.926 -74.6384,171.926 -74.1946,171.926 -73.7508,171.926 -73.307,171.926 -72.8632,171.926 -72.4194,171.926 -71.9756,171.926 -71.5318,171.926 -71.088,172.7334 -71.088,173.5408 -71.088,174.3482 -71.088,175.1556 -71.088,175.963 -71.088,176.7704 -71.088,177.5778 -71.088,178.3852 -71.088,179.1926 -71.088,-180 -71.088))"] |
|
Specific growth rate measurements for 46 Southern Ocean diatoms
|
1543245 |
2019-07-08 | Bishop, Ian |
NSFGEO-NERC: Evolutionary Response of Southern Ocean Diatoms to Environmental Change |
This dataset includes records of the specific growth rates measured for 46 clonal diatom strains originally isolated during the research cruise NBP-1701 across the Pacific sector of the Southern Ocean during December 2016-January 2017. Strains were grown under continuous light (130 µmol m-2 s-1) at up to 8 temperatures that span all or most of each strain’s thermal niche width, from 0-12 degrees C, which encompasses each strain’s optimum temperature for growth. Strains have been molecularly identified to species via 18S Sanger sequencing. Data include the following information for each record: Internal lab strain reference ID, date collected, latitude, longitude, Southern Ocean region, species, tested temperature, replicate number and specific growth rate. Data are provided in comma-separated values (csv) format. | ["POLYGON((-179 -59,-167.7 -59,-156.4 -59,-145.1 -59,-133.8 -59,-122.5 -59,-111.2 -59,-99.9 -59,-88.6 -59,-77.3 -59,-66 -59,-66 -60.9,-66 -62.8,-66 -64.7,-66 -66.6,-66 -68.5,-66 -70.4,-66 -72.3,-66 -74.2,-66 -76.1,-66 -78,-77.3 -78,-88.6 -78,-99.9 -78,-111.2 -78,-122.5 -78,-133.8 -78,-145.1 -78,-156.4 -78,-167.7 -78,-179 -78,-179 -76.1,-179 -74.2,-179 -72.3,-179 -70.4,-179 -68.5,-179 -66.6,-179 -64.7,-179 -62.8,-179 -60.9,-179 -59))"] |
|
AC-ECM for SPICEcore
|
1443232 |
2019-07-08 | Fudge, T. J.; Waddington, Edwin |
Using Electrical Conductance Measurements to Develop the South Pole Ice Core Chronology |
These are AC-ECM data used to identify volcanic events in SPICEcore. The data have been normalized to get a consistent baseline for data collected from three different processing seasons. | ["POINT(-180 -90)"] |
|
PIPERS airborne lidar
|
1341717 |
2019-07-02 | Bell, Robin |
Collaborative Research: Seasonal Sea Ice Production in the Ross Sea, Antarctica |
The PIPERS LiDAR swath data set contains LiDAR measurements taken over the Ross Sea in Antarctica. The PIPERS project flew for two consecutive years during November with the IcePod. A total of three flights were flown. | ["POLYGON((-180 -71,-178.3 -71,-176.6 -71,-174.9 -71,-173.2 -71,-171.5 -71,-169.8 -71,-168.1 -71,-166.4 -71,-164.7 -71,-163 -71,-163 -71.7,-163 -72.4,-163 -73.1,-163 -73.8,-163 -74.5,-163 -75.2,-163 -75.9,-163 -76.6,-163 -77.3,-163 -78,-164.7 -78,-166.4 -78,-168.1 -78,-169.8 -78,-171.5 -78,-173.2 -78,-174.9 -78,-176.6 -78,-178.3 -78,180 -78,178.4 -78,176.8 -78,175.2 -78,173.6 -78,172 -78,170.4 -78,168.8 -78,167.2 -78,165.6 -78,164 -78,164 -77.3,164 -76.6,164 -75.9,164 -75.2,164 -74.5,164 -73.8,164 -73.1,164 -72.4,164 -71.7,164 -71,165.6 -71,167.2 -71,168.8 -71,170.4 -71,172 -71,173.6 -71,175.2 -71,176.8 -71,178.4 -71,-180 -71))"] |
|
PIPERS Meteorology Rawinsonde Data
|
1341725 |
2019-06-12 | Guest, Peter |
Collaborative Research: Seasonal Sea Ice Production in the Ross Sea, Antarctica |
This file contains rawinsonde data from 134 rawisnonde soundings performed during the 2017 PIPERS cruise for the period 14 April 2330 – 5 June 1130 (UT). | ["POLYGON((-180 -62,-179.5 -62,-179 -62,-178.5 -62,-178 -62,-177.5 -62,-177 -62,-176.5 -62,-176 -62,-175.5 -62,-175 -62,-175 -63.6,-175 -65.2,-175 -66.8,-175 -68.4,-175 -70,-175 -71.6,-175 -73.2,-175 -74.8,-175 -76.4,-175 -78,-175.5 -78,-176 -78,-176.5 -78,-177 -78,-177.5 -78,-178 -78,-178.5 -78,-179 -78,-179.5 -78,180 -78,178.8 -78,177.6 -78,176.4 -78,175.2 -78,174 -78,172.8 -78,171.6 -78,170.4 -78,169.2 -78,168 -78,168 -76.4,168 -74.8,168 -73.2,168 -71.6,168 -70,168 -68.4,168 -66.8,168 -65.2,168 -63.6,168 -62,169.2 -62,170.4 -62,171.6 -62,172.8 -62,174 -62,175.2 -62,176.4 -62,177.6 -62,178.8 -62,-180 -62))"] |
|
PIPERS Meteorology Time Series
|
1341725 |
2019-06-12 | Guest, Peter |
Collaborative Research: Seasonal Sea Ice Production in the Ross Sea, Antarctica |
This file contains times series data from the 2017 PIPERS cruise for the period 15 April 0000 – 8 June 1200 (UT). The time series data represent one minute means and include data collected by the Naval Postgraduate School from the starboard side boom (including occasionally on ice surface temp sampling), radiation system on the helo deck and sometimes in situ surface temp. Also included are meteorological, navigation and surface oceanography (from intake) data from the standard ship systems. | ["POLYGON((-180 -62,-179.5 -62,-179 -62,-178.5 -62,-178 -62,-177.5 -62,-177 -62,-176.5 -62,-176 -62,-175.5 -62,-175 -62,-175 -63.6,-175 -65.2,-175 -66.8,-175 -68.4,-175 -70,-175 -71.6,-175 -73.2,-175 -74.8,-175 -76.4,-175 -78,-175.5 -78,-176 -78,-176.5 -78,-177 -78,-177.5 -78,-178 -78,-178.5 -78,-179 -78,-179.5 -78,180 -78,178.8 -78,177.6 -78,176.4 -78,175.2 -78,174 -78,172.8 -78,171.6 -78,170.4 -78,169.2 -78,168 -78,168 -76.4,168 -74.8,168 -73.2,168 -71.6,168 -70,168 -68.4,168 -66.8,168 -65.2,168 -63.6,168 -62,169.2 -62,170.4 -62,171.6 -62,172.8 -62,174 -62,175.2 -62,176.4 -62,177.6 -62,178.8 -62,-180 -62))"] |
|
ASPeCt Visual Ice Observations on PIPERS Cruise NBP1704 April-June 2017
|
1341717 |
2019-06-10 | Ackley, Stephen |
Collaborative Research: Seasonal Sea Ice Production in the Ross Sea, Antarctica |
This dataset is the csv file of hourly visual ice observations conducted in the ASPeCt protocol on the PIPERS cruise NBP1704 to the Ross Sea during April to June 5 2017. Parameters are ice concentration, thickness, snow depth, floe sizes, etc for up to three categories of ice type within a 1km radius of the ship during the observation. These are identified by date, time and latitude, longitude at the time of observations | ["POLYGON((-180 -55,-177 -55,-174 -55,-171 -55,-168 -55,-165 -55,-162 -55,-159 -55,-156 -55,-153 -55,-150 -55,-150 -57.3,-150 -59.6,-150 -61.9,-150 -64.2,-150 -66.5,-150 -68.8,-150 -71.1,-150 -73.4,-150 -75.7,-150 -78,-153 -78,-156 -78,-159 -78,-162 -78,-165 -78,-168 -78,-171 -78,-174 -78,-177 -78,180 -78,178 -78,176 -78,174 -78,172 -78,170 -78,168 -78,166 -78,164 -78,162 -78,160 -78,160 -75.7,160 -73.4,160 -71.1,160 -68.8,160 -66.5,160 -64.2,160 -61.9,160 -59.6,160 -57.3,160 -55,162 -55,164 -55,166 -55,168 -55,170 -55,172 -55,174 -55,176 -55,178 -55,-180 -55))"] |
|
NBP1502 YoYo camera benthic images from Ross Sea
|
1246357 |
2019-06-03 | Bart, Philip |
Timing and Duration of the LGM and Post-LGM Grounding Events in Whales Deep Paleo Ice Stream, Eastern Ross Sea Middle Continental Shelf |
Still and video benthic images collected during expedition NBP1502 in the Ross Sea using a YoYo camera system. | ["POLYGON((-171 -75.8,-170.5 -75.8,-170 -75.8,-169.5 -75.8,-169 -75.8,-168.5 -75.8,-168 -75.8,-167.5 -75.8,-167 -75.8,-166.5 -75.8,-166 -75.8,-166 -75.99,-166 -76.18,-166 -76.37,-166 -76.56,-166 -76.75,-166 -76.94,-166 -77.13,-166 -77.32,-166 -77.51,-166 -77.7,-166.5 -77.7,-167 -77.7,-167.5 -77.7,-168 -77.7,-168.5 -77.7,-169 -77.7,-169.5 -77.7,-170 -77.7,-170.5 -77.7,-171 -77.7,-171 -77.51,-171 -77.32,-171 -77.13,-171 -76.94,-171 -76.75,-171 -76.56,-171 -76.37,-171 -76.18,-171 -75.99,-171 -75.8))"] |
|
Geophysical data from Crary Ice Rise, Ross Sea Embayment
|
1443552 1443356 |
2019-05-20 | Conway, Howard; Koutnik, Michelle; Winberry, Paul; Paden, John |
Collaborative Research: Grounding Line Dynamics: Crary Ice Rise Revisited |
This data set contains radar-detected measurements of surface topography, internal stratigraphy, ice thickness and derived bed topography across Crary Ice Rise in the Ross Sea Embayment. | ["POLYGON((-174.95 -82.65,-174.35 -82.65,-173.75 -82.65,-173.15 -82.65,-172.55 -82.65,-171.95 -82.65,-171.35 -82.65,-170.75 -82.65,-170.15 -82.65,-169.55 -82.65,-168.95 -82.65,-168.95 -82.729,-168.95 -82.808,-168.95 -82.887,-168.95 -82.966,-168.95 -83.045,-168.95 -83.124,-168.95 -83.203,-168.95 -83.282,-168.95 -83.361,-168.95 -83.44,-169.55 -83.44,-170.15 -83.44,-170.75 -83.44,-171.35 -83.44,-171.95 -83.44,-172.55 -83.44,-173.15 -83.44,-173.75 -83.44,-174.35 -83.44,-174.95 -83.44,-174.95 -83.361,-174.95 -83.282,-174.95 -83.203,-174.95 -83.124,-174.95 -83.045,-174.95 -82.966,-174.95 -82.887,-174.95 -82.808,-174.95 -82.729,-174.95 -82.65))"] |
|
Geochemical and sedimentologic data from NBP01-01 JPC-34
|
1246378 |
2019-05-10 | Shevenell, Amelia |
Late Quaternary Evolution of the Lambert Glacier/Amery Ice Shelf System, Prydz Bay, Antarctica |
This dataset contains 14C data, magnetic susceptibility, relative grain size percentages, 10Be | ["POLYGON((70 -68,70.5 -68,71 -68,71.5 -68,72 -68,72.5 -68,73 -68,73.5 -68,74 -68,74.5 -68,75 -68,75 -68.2,75 -68.4,75 -68.6,75 -68.8,75 -69,75 -69.2,75 -69.4,75 -69.6,75 -69.8,75 -70,74.5 -70,74 -70,73.5 -70,73 -70,72.5 -70,72 -70,71.5 -70,71 -70,70.5 -70,70 -70,70 -69.8,70 -69.6,70 -69.4,70 -69.2,70 -69,70 -68.8,70 -68.6,70 -68.4,70 -68.2,70 -68))"] |
|
The Geochemistry of englacial brine from Taylor Glacier, Antarctica.
|
1144176 |
2019-05-07 | Lyons, W. Berry; Gardner, Christopher B. |
Collaborative Research: MIDGE: Minimally Invasive Direct Glacial Exploration of Biogeochemistry, Hydrology and Glaciology of Blood Falls, McMurdo Dry Valleys |
Blood Falls is a hypersaline, iron‐rich discharge at the terminus of the Taylor Glacier in the McMurdo Dry Valleys, Antarctica. In November 2014, brine in a conduit within the glacier was penetrated and sampled using clean‐entry techniques and a thermoelectric melting probe called the IceMole. We analyzed the englacial brine sample for filterable iron (fFe), total Fe, major cations and anions, nutrients, organic carbon, and perchlorate. In addition, aliquots were analyzed for minor and trace elements and isotopes including δD and δ18O of water, δ34S and δ18O of sulfate, 234U, 238U, δ11B, 87Sr/86Sr, and δ81Br. These measurements were made in order to (1) determine the source and geochemical evolution of the brine and (2) compare the chemistry of the brine to that of nearby hypersaline lake waters and previous supraglacially sampled collections of Blood Falls outflow that were interpreted as end‐member brines. | ["POLYGON((162.250099 -77.719928,162.2519358 -77.719928,162.2537726 -77.719928,162.2556094 -77.719928,162.2574462 -77.719928,162.259283 -77.719928,162.2611198 -77.719928,162.2629566 -77.719928,162.2647934 -77.719928,162.2666302 -77.719928,162.268467 -77.719928,162.268467 -77.7201251,162.268467 -77.7203222,162.268467 -77.7205193,162.268467 -77.7207164,162.268467 -77.7209135,162.268467 -77.7211106,162.268467 -77.7213077,162.268467 -77.7215048,162.268467 -77.7217019,162.268467 -77.721899,162.2666302 -77.721899,162.2647934 -77.721899,162.2629566 -77.721899,162.2611198 -77.721899,162.259283 -77.721899,162.2574462 -77.721899,162.2556094 -77.721899,162.2537726 -77.721899,162.2519358 -77.721899,162.250099 -77.721899,162.250099 -77.7217019,162.250099 -77.7215048,162.250099 -77.7213077,162.250099 -77.7211106,162.250099 -77.7209135,162.250099 -77.7207164,162.250099 -77.7205193,162.250099 -77.7203222,162.250099 -77.7201251,162.250099 -77.719928))"] |
|
CTD stations and logs for Araon 2018 ANA08D expedition to Larson C
|
1822289 |
2019-04-29 | Pan, B. Jack; Vernet, Maria |
RAPID: Collaborative Research: Marine Ecosystem Response to the Larsen C Ice-Shelf Breakout: "Time zero" |
Marine ecosystems under large ice shelves are thought to contain sparse, low-diversity plankton and seafloor communities due the low supply of food from productive sunlight waters. Past studies have shown sub-ice shelf ecosystems to change in response to altered oceanographic processes resulting from ice-shelve retreat. However, information on community changes and ecosystem structure under ice shelves are limited because sub-ice-shelf ecosystems have either been sampled many years after ice-shelf breakout, or have been sampled through small boreholes, yielding extremely limited spatial information. The recent breakout of the A-68 iceberg from the Larsen C ice shelf in the western Weddell Sea provides an opportunity to use a ship-based study to evaluate benthic communities and water column characteristics in an area recently vacated by a large overlying ice shelf. The opportunity will allow spatial assessments at the time of transition from an under ice-shelf environment to one initially exposed to conditions more typical of a coastal Antarctic marine setting. This RAPID project will help determine the state of a coastal Antarctic ecosystem newly exposed from ice-shelf cover and will aid in understanding of rates of community change during transition. The project will conduct a 10-day field program, allowing contrasts to be made of phytoplankton and seafloor megafaunal communities in areas recently exposed by ice-shelf loss to areas exposed for many decades. The project will be undertaken in a collaborative manner with the South Korean Antarctic Agency, KOPRI, by participating in a cruise in March/May 2018. Combining new information in the area of Larsen C with existing observations after the Larsen A and B ice shelf breakups further to the north, the project is expected to generate a dataset that can elucidate fundamental processes of planktonic and benthic community development in transition from food-poor to food-rich ecosystems. The project will provide field experience to two graduate students, a post-doctoral associate and an undergraduate student. Material from the project will be incorporated into graduate courses and the project will communicate daily work and unfolding events through social media and blogs while they explore this area of the world that is largely underexplored. | ["POLYGON((-59.402149 -62.131908,-58.9639887 -62.131908,-58.5258284 -62.131908,-58.0876681 -62.131908,-57.6495078 -62.131908,-57.2113475 -62.131908,-56.7731872 -62.131908,-56.3350269 -62.131908,-55.8968666 -62.131908,-55.4587063 -62.131908,-55.020546 -62.131908,-55.020546 -62.384829,-55.020546 -62.63775,-55.020546 -62.890671,-55.020546 -63.143592,-55.020546 -63.396513,-55.020546 -63.649434,-55.020546 -63.902355,-55.020546 -64.155276,-55.020546 -64.408197,-55.020546 -64.661118,-55.4587063 -64.661118,-55.8968666 -64.661118,-56.3350269 -64.661118,-56.7731872 -64.661118,-57.2113475 -64.661118,-57.6495078 -64.661118,-58.0876681 -64.661118,-58.5258284 -64.661118,-58.9639887 -64.661118,-59.402149 -64.661118,-59.402149 -64.408197,-59.402149 -64.155276,-59.402149 -63.902355,-59.402149 -63.649434,-59.402149 -63.396513,-59.402149 -63.143592,-59.402149 -62.890671,-59.402149 -62.63775,-59.402149 -62.384829,-59.402149 -62.131908))"] |
|
Diatom assemblages from Edward VIII Gulf, Kemp Coast, East Antarctica
|
9909367 |
2019-04-25 | Leventer, Amy |
Quaternary Glacial History and Paleoenvironments of the East Antarctic Margin |
This data set describes diatom assemblages and abundances from two sediment cores retrieved from Edward VIII Gulf. The assemblages are used to reconstruct paleoceanographic conditions throughout the Holocene. | ["POLYGON((57 -66,57.3 -66,57.6 -66,57.9 -66,58.2 -66,58.5 -66,58.8 -66,59.1 -66,59.4 -66,59.7 -66,60 -66,60 -66.1,60 -66.2,60 -66.3,60 -66.4,60 -66.5,60 -66.6,60 -66.7,60 -66.8,60 -66.9,60 -67,59.7 -67,59.4 -67,59.1 -67,58.8 -67,58.5 -67,58.2 -67,57.9 -67,57.6 -67,57.3 -67,57 -67,57 -66.9,57 -66.8,57 -66.7,57 -66.6,57 -66.5,57 -66.4,57 -66.3,57 -66.2,57 -66.1,57 -66))"] |
|
Taylor Glacier Noble Gases - Younger Dryas
|
1245821 1246148 1245659 0739766 |
2019-04-23 | Shackleton, Sarah |
Collaborative Research: The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive |
Noble gas data from Taylor Glacier for mean ocean temperature reconstruction during the Younger Dryas. Also includes field measurements of methane and standard deviations of replicate CO2 measurements from WAIS Divide. | ["POLYGON((161.68 -77.73,161.7 -77.73,161.72 -77.73,161.74 -77.73,161.76 -77.73,161.78 -77.73,161.8 -77.73,161.82 -77.73,161.84 -77.73,161.86 -77.73,161.88 -77.73,161.88 -77.734,161.88 -77.738,161.88 -77.742,161.88 -77.746,161.88 -77.75,161.88 -77.754,161.88 -77.758,161.88 -77.762,161.88 -77.766,161.88 -77.77,161.86 -77.77,161.84 -77.77,161.82 -77.77,161.8 -77.77,161.78 -77.77,161.76 -77.77,161.74 -77.77,161.72 -77.77,161.7 -77.77,161.68 -77.77,161.68 -77.766,161.68 -77.762,161.68 -77.758,161.68 -77.754,161.68 -77.75,161.68 -77.746,161.68 -77.742,161.68 -77.738,161.68 -77.734,161.68 -77.73))"] |
|
NetCDF outputs from middle Eocene climate simulation using the GENESIS global circulation model
|
1543031 |
2019-04-22 | Judd, Emily |
Seasonality, Summer Cooling, and Calibrating the Approach of the Icehouse in Late Eocene Antarctica |
GENESIS global circulation model (GCM) outputs from a middle Eocene simulation parameterized with 2000 ppm pCO2, high obliquity, and no Antarctic ice. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Oxygen isotope data from serially sampled Eocene bivalves from the La Meseta Fm., Seymour Island, Antarctica
|
1543031 |
2019-04-22 | Judd, Emily |
Seasonality, Summer Cooling, and Calibrating the Approach of the Icehouse in Late Eocene Antarctica |
Serially-sampled high-resolution oxygen isotope data from middle Eocene (~42 Ma) bivalves preserved within the La Meseta Formation, Seymour Island, Antarctica. | ["POLYGON((-57 -64,-56.9 -64,-56.8 -64,-56.7 -64,-56.6 -64,-56.5 -64,-56.4 -64,-56.3 -64,-56.2 -64,-56.1 -64,-56 -64,-56 -64.05,-56 -64.1,-56 -64.15,-56 -64.2,-56 -64.25,-56 -64.3,-56 -64.35,-56 -64.4,-56 -64.45,-56 -64.5,-56.1 -64.5,-56.2 -64.5,-56.3 -64.5,-56.4 -64.5,-56.5 -64.5,-56.6 -64.5,-56.7 -64.5,-56.8 -64.5,-56.9 -64.5,-57 -64.5,-57 -64.45,-57 -64.4,-57 -64.35,-57 -64.3,-57 -64.25,-57 -64.2,-57 -64.15,-57 -64.1,-57 -64.05,-57 -64))"] |
|
Organic carbon isotope data from serially sampled Eocene driftwood from the La Meseta Fm., Seymour Island, Antarctica
|
1543031 |
2019-04-22 | Judd, Emily |
Seasonality, Summer Cooling, and Calibrating the Approach of the Icehouse in Late Eocene Antarctica |
Serially-sampled high-resolution organic carbon isotope data from middle Eocene (~42 Ma) driftwood preserved within the La Meseta Formation, Seymour Island, Antarctica. | ["POLYGON((-57 -64,-56.9 -64,-56.8 -64,-56.7 -64,-56.6 -64,-56.5 -64,-56.4 -64,-56.3 -64,-56.2 -64,-56.1 -64,-56 -64,-56 -64.05,-56 -64.1,-56 -64.15,-56 -64.2,-56 -64.25,-56 -64.3,-56 -64.35,-56 -64.4,-56 -64.45,-56 -64.5,-56.1 -64.5,-56.2 -64.5,-56.3 -64.5,-56.4 -64.5,-56.5 -64.5,-56.6 -64.5,-56.7 -64.5,-56.8 -64.5,-56.9 -64.5,-57 -64.5,-57 -64.45,-57 -64.4,-57 -64.35,-57 -64.3,-57 -64.25,-57 -64.2,-57 -64.15,-57 -64.1,-57 -64.05,-57 -64))"] |
|
WAIS Divide Multi Track Electrical Measurements
|
0944197 0944191 |
2019-04-12 | Fudge, T. J.; Taylor, Kendrick C.; J. Fudge, T. |
Collaborative Research: Establishing the Chronology and Histories of Accumulation and Ice Dynamics for the WAIS Divide Core |
Images of the multi-track electrical data for depths below 1956 m are given in mt_compiled_1958_3406.pdf. Images are approximately to scale. Data for individual sections can be obtained by contacting T.J. Fudge at tjfudge@uw.edu. Warm colors are high electrical conductivity. Cool colors are low electrical conductivity. Each track is normalized by subtracting the mean and dividing by the standard deviation. Plotted values are a 3-measurement (3mm) running average. Measurements affected by breaks in the core have been masked out. X-axis is approximate horizontal position on the ice core, as measured from left from looking from bottom to top of the core. Y-axis is depth in meters. Title is the tube number. | ["POLYGON((-115 -80,-114.5 -80,-114 -80,-113.5 -80,-113 -80,-112.5 -80,-112 -80,-111.5 -80,-111 -80,-110.5 -80,-110 -80,-110 -79.9,-110 -79.8,-110 -79.7,-110 -79.6,-110 -79.5,-110 -79.4,-110 -79.3,-110 -79.2,-110 -79.1,-110 -79,-110.5 -79,-111 -79,-111.5 -79,-112 -79,-112.5 -79,-113 -79,-113.5 -79,-114 -79,-114.5 -79,-115 -79,-115 -79.1,-115 -79.2,-115 -79.3,-115 -79.4,-115 -79.5,-115 -79.6,-115 -79.7,-115 -79.8,-115 -79.9,-115 -80))"] |
|
16S rRNA gene libraries of krill gut microbial communities
|
1543412 |
2019-03-31 | Reinfelder, John |
Methylmercury in Antarctic Krill Microbiomes |
This dataset includes 16S rRNA gene libraries produced from DNA extracted from pooled digestive tracts of Antarctic krill (Euphausia superba) collected in coastal waters west of the Antarctic Peninsula in 2014. | ["POLYGON((-69.9043 -65.8708,-69.74203 -65.8708,-69.57976 -65.8708,-69.41749 -65.8708,-69.25522 -65.8708,-69.09295 -65.8708,-68.93068 -65.8708,-68.76841 -65.8708,-68.60614 -65.8708,-68.44387 -65.8708,-68.2816 -65.8708,-68.2816 -66.05698,-68.2816 -66.24316,-68.2816 -66.42934,-68.2816 -66.61552,-68.2816 -66.8017,-68.2816 -66.98788,-68.2816 -67.17406,-68.2816 -67.36024,-68.2816 -67.54642,-68.2816 -67.7326,-68.44387 -67.7326,-68.60614 -67.7326,-68.76841 -67.7326,-68.93068 -67.7326,-69.09295 -67.7326,-69.25522 -67.7326,-69.41749 -67.7326,-69.57976 -67.7326,-69.74203 -67.7326,-69.9043 -67.7326,-69.9043 -67.54642,-69.9043 -67.36024,-69.9043 -67.17406,-69.9043 -66.98788,-69.9043 -66.8017,-69.9043 -66.61552,-69.9043 -66.42934,-69.9043 -66.24316,-69.9043 -66.05698,-69.9043 -65.8708))"] |
|
Report on Antarctic surface hydrology workshop, LDEO, 2018
|
1743326 |
2019-03-22 | Kingslake, Jonathan; Trusel, Luke; Banwell, Alison; Bell, Robin; Das, Indrani; DeConto, Robert; Tedesco, Marco; Lenaerts, Jan; Schoof, Christian |
Workshop on Antarctic Surface Hydrology and Future Ice-shelf Stability |
In February 2018, we hosted a workshop on Antarctic Surface Hydrology and Future Ice-shelf Stability at Lamont-Doherty Earth Observatory, Palisades, New York. Funding for the workshop was provided by the U.S. National Science Foundation (NSF) Antarctic Glaciology Program (award number: 1743326). The aims of the workshop were to: (1) establish the state-of-the-science of Antarctic surface hydrology; (2) identify key science questions raised by observations and theoretical studies of Antarctic surface hydrology, and (3) move the community toward answering these questions by bringing together scientists with diverse expertise. The workshop was motivated by the premise that significant gains in our understanding can be made if researchers with interests in this field are provided with an opportunity to communicate and develop collaborations across disciplines. Here we report on the organisation, attendance, and structure of the workshop, before summarizing key science outcomes, research questions, and future priorities that emerged during the workshop within the following four themes: 1. Surface melting: controls and observations 2. Water ponding and flow 3. Impact of meltwater on ice-shelf stability 4. Ice-sheet/climate modeling Finally, building on the emergent science questions, we propose a framework for prioritizing future work, aimed at understanding and predicting the impact that surface meltwater will have on future Antarctic Ice Sheet mass balance. | [] |
|
FLIR thermal imaging data near Blood Falls, Taylor Glacier
|
1144177 |
2019-03-19 | Pettit, Erin |
Collaborative Research: MIDGE: Minimally Invasive Direct Glacial Exploration of Biogeochemistry, Hydrology and Glaciology of Blood Falls, McMurdo Dry Valleys |
The data set contains FLIR thermal imaging of Blood Falls from December 9 through March 25 (power failure). | ["POLYGON((161.8 -77.7,161.88 -77.7,161.96 -77.7,162.04 -77.7,162.12 -77.7,162.2 -77.7,162.28 -77.7,162.36 -77.7,162.44 -77.7,162.52 -77.7,162.6 -77.7,162.6 -77.707,162.6 -77.714,162.6 -77.721,162.6 -77.728,162.6 -77.735,162.6 -77.742,162.6 -77.749,162.6 -77.756,162.6 -77.763,162.6 -77.77,162.52 -77.77,162.44 -77.77,162.36 -77.77,162.28 -77.77,162.2 -77.77,162.12 -77.77,162.04 -77.77,161.96 -77.77,161.88 -77.77,161.8 -77.77,161.8 -77.763,161.8 -77.756,161.8 -77.749,161.8 -77.742,161.8 -77.735,161.8 -77.728,161.8 -77.721,161.8 -77.714,161.8 -77.707,161.8 -77.7))"] |
|
Vaisala Integrated Met Station near Blood Falls, Taylor Glacier
|
1144177 |
2019-03-18 | Pettit, Erin |
Collaborative Research: MIDGE: Minimally Invasive Direct Glacial Exploration of Biogeochemistry, Hydrology and Glaciology of Blood Falls, McMurdo Dry Valleys |
This data set contains a short term integrated met station deployed about 300m from Blood Falls at the site of the FLIR and Time Lapse cameras. | ["POLYGON((161.8 -77.7,161.88 -77.7,161.96 -77.7,162.04 -77.7,162.12 -77.7,162.2 -77.7,162.28 -77.7,162.36 -77.7,162.44 -77.7,162.52 -77.7,162.6 -77.7,162.6 -77.707,162.6 -77.714,162.6 -77.721,162.6 -77.728,162.6 -77.735,162.6 -77.742,162.6 -77.749,162.6 -77.756,162.6 -77.763,162.6 -77.77,162.52 -77.77,162.44 -77.77,162.36 -77.77,162.28 -77.77,162.2 -77.77,162.12 -77.77,162.04 -77.77,161.96 -77.77,161.88 -77.77,161.8 -77.77,161.8 -77.763,161.8 -77.756,161.8 -77.749,161.8 -77.742,161.8 -77.735,161.8 -77.728,161.8 -77.721,161.8 -77.714,161.8 -77.707,161.8 -77.7))"] |
|
Time Lapse imagery of the Blood Falls feature, Antarctica
|
1144177 |
2019-03-18 | Pettit, Erin |
Collaborative Research: MIDGE: Minimally Invasive Direct Glacial Exploration of Biogeochemistry, Hydrology and Glaciology of Blood Falls, McMurdo Dry Valleys |
This data set contains Time Lapse imagery of the Blood Falls feature, Antarctica, collected between January 2014 and January 2015. | ["POLYGON((161.8 -77.7,161.88 -77.7,161.96 -77.7,162.04 -77.7,162.12 -77.7,162.2 -77.7,162.28 -77.7,162.36 -77.7,162.44 -77.7,162.52 -77.7,162.6 -77.7,162.6 -77.707,162.6 -77.714,162.6 -77.721,162.6 -77.728,162.6 -77.735,162.6 -77.742,162.6 -77.749,162.6 -77.756,162.6 -77.763,162.6 -77.77,162.52 -77.77,162.44 -77.77,162.36 -77.77,162.28 -77.77,162.2 -77.77,162.12 -77.77,162.04 -77.77,161.96 -77.77,161.88 -77.77,161.8 -77.77,161.8 -77.763,161.8 -77.756,161.8 -77.749,161.8 -77.742,161.8 -77.735,161.8 -77.728,161.8 -77.721,161.8 -77.714,161.8 -77.707,161.8 -77.7))"] |
|
Terrestrial Radar Interferometry near Blood Falls, Taylor Glacier
|
1144177 |
2019-03-18 | Pettit, Erin |
Collaborative Research: MIDGE: Minimally Invasive Direct Glacial Exploration of Biogeochemistry, Hydrology and Glaciology of Blood Falls, McMurdo Dry Valleys |
This data set contains GPR data along multiple transects of the Blood Falls feature collected in November and Dcember 2013. | ["POLYGON((161.8 -77.7,161.88 -77.7,161.96 -77.7,162.04 -77.7,162.12 -77.7,162.2 -77.7,162.28 -77.7,162.36 -77.7,162.44 -77.7,162.52 -77.7,162.6 -77.7,162.6 -77.707,162.6 -77.714,162.6 -77.721,162.6 -77.728,162.6 -77.735,162.6 -77.742,162.6 -77.749,162.6 -77.756,162.6 -77.763,162.6 -77.77,162.52 -77.77,162.44 -77.77,162.36 -77.77,162.28 -77.77,162.2 -77.77,162.12 -77.77,162.04 -77.77,161.96 -77.77,161.88 -77.77,161.8 -77.77,161.8 -77.763,161.8 -77.756,161.8 -77.749,161.8 -77.742,161.8 -77.735,161.8 -77.728,161.8 -77.721,161.8 -77.714,161.8 -77.707,161.8 -77.7))"] |
|
Ground Penetrating Radar Data near Blood Falls, Taylor Glacier
|
1144177 |
2019-03-18 | Pettit, Erin |
Collaborative Research: MIDGE: Minimally Invasive Direct Glacial Exploration of Biogeochemistry, Hydrology and Glaciology of Blood Falls, McMurdo Dry Valleys |
This data set contains GPR data along multiple transects of the Blood Falls feature collected in November and Dcember 2013. | ["POLYGON((161.8 -77.7,161.88 -77.7,161.96 -77.7,162.04 -77.7,162.12 -77.7,162.2 -77.7,162.28 -77.7,162.36 -77.7,162.44 -77.7,162.52 -77.7,162.6 -77.7,162.6 -77.707,162.6 -77.714,162.6 -77.721,162.6 -77.728,162.6 -77.735,162.6 -77.742,162.6 -77.749,162.6 -77.756,162.6 -77.763,162.6 -77.77,162.52 -77.77,162.44 -77.77,162.36 -77.77,162.28 -77.77,162.2 -77.77,162.12 -77.77,162.04 -77.77,161.96 -77.77,161.88 -77.77,161.8 -77.77,161.8 -77.763,161.8 -77.756,161.8 -77.749,161.8 -77.742,161.8 -77.735,161.8 -77.728,161.8 -77.721,161.8 -77.714,161.8 -77.707,161.8 -77.7))"] |
|
Ablation Stake Data from of Taylor Glacier near Blood Falls
|
1144177 |
2019-03-18 | Pettit, Erin |
Collaborative Research: MIDGE: Minimally Invasive Direct Glacial Exploration of Biogeochemistry, Hydrology and Glaciology of Blood Falls, McMurdo Dry Valleys |
This data set contains time-stamped time-lapse imagery of the Blood Falls feature from approximately November 2013 through October 2014, capturing wintertime activity of the glacier. See readme for details. | ["POLYGON((161.8 -77.7,161.88 -77.7,161.96 -77.7,162.04 -77.7,162.12 -77.7,162.2 -77.7,162.28 -77.7,162.36 -77.7,162.44 -77.7,162.52 -77.7,162.6 -77.7,162.6 -77.707,162.6 -77.714,162.6 -77.721,162.6 -77.728,162.6 -77.735,162.6 -77.742,162.6 -77.749,162.6 -77.756,162.6 -77.763,162.6 -77.77,162.52 -77.77,162.44 -77.77,162.36 -77.77,162.28 -77.77,162.2 -77.77,162.12 -77.77,162.04 -77.77,161.96 -77.77,161.88 -77.77,161.8 -77.77,161.8 -77.763,161.8 -77.756,161.8 -77.749,161.8 -77.742,161.8 -77.735,161.8 -77.728,161.8 -77.721,161.8 -77.714,161.8 -77.707,161.8 -77.7))"] |
|
Laboratory Hyperspectral Reflectance Data of Central Transantarctic Mountain Rocks and Sediments
|
1758224 |
2019-03-15 | Salvatore, Mark |
EAGER: Surface Variability and Spectral Analyses of the Central Transantarctic Mountains, Antarctica |
This data set contains reflectance spectra (350 - 2500 nm) of a range of rocks and sediments from the Central Transantarctic Mountains. Data were acquired using an Analytical Spectral Devices (ASD) FieldSpec4 high-resolution spectrometer under illumination with a high-output halogen bulb, with illumination and observation angles fixed at 0 and 30 degrees off-nadir, respectively. Data were acquired for the purposes of validation and 'ground truthing' of orbital multispectral data. | ["POLYGON((-180 -83,-177 -83,-174 -83,-171 -83,-168 -83,-165 -83,-162 -83,-159 -83,-156 -83,-153 -83,-150 -83,-150 -83.5,-150 -84,-150 -84.5,-150 -85,-150 -85.5,-150 -86,-150 -86.5,-150 -87,-150 -87.5,-150 -88,-153 -88,-156 -88,-159 -88,-162 -88,-165 -88,-168 -88,-171 -88,-174 -88,-177 -88,180 -88,177 -88,174 -88,171 -88,168 -88,165 -88,162 -88,159 -88,156 -88,153 -88,150 -88,150 -87.5,150 -87,150 -86.5,150 -86,150 -85.5,150 -85,150 -84.5,150 -84,150 -83.5,150 -83,153 -83,156 -83,159 -83,162 -83,165 -83,168 -83,171 -83,174 -83,177 -83,-180 -83))"] |
|
Summer Oceanographic Measurements near the Mertz Polynya NBP0008
|
9725024 9909374 |
2019-03-11 | Jacobs, Stanley; Mele, Phil; Smethie, W. M.; Mortlock, R. A. |
Circumpolar Deep Water and the West Antarctic Ice Sheet Shelf and Bottom Water Formation Near East Antarctic Polynyas and Glaciers |
Summer Oceanographic Measurements near the Mertz Polynya (140-150E) on NB Palmer Cruise 00-08. These are processed, high resolution CTD and bottle data files; Standard level listings and station listings and plots. | ["POLYGON((140 -65.5,141 -65.5,142 -65.5,143 -65.5,144 -65.5,145 -65.5,146 -65.5,147 -65.5,148 -65.5,149 -65.5,150 -65.5,150 -65.75,150 -66,150 -66.25,150 -66.5,150 -66.75,150 -67,150 -67.25,150 -67.5,150 -67.75,150 -68,149 -68,148 -68,147 -68,146 -68,145 -68,144 -68,143 -68,142 -68,141 -68,140 -68,140 -67.75,140 -67.5,140 -67.25,140 -67,140 -66.75,140 -66.5,140 -66.25,140 -66,140 -65.75,140 -65.5))"] |
|
Log Sheets of coral samples for LMG1509
|
1245766 |
2019-03-07 | Waller, Rhian |
Cold Corals in Hot Water - Investigating the Physiological Responses of Antarctic Coral Larvae to Climate change Stress |
Station location information of trawl and CTD stations used for collecting coral samples and water for incubation during expedition NBP1509 in 2015 near the Antarctic Peninsula. | ["POLYGON((-66.5 -63,-65.95 -63,-65.4 -63,-64.85 -63,-64.3 -63,-63.75 -63,-63.2 -63,-62.65 -63,-62.1 -63,-61.55 -63,-61 -63,-61 -63.63,-61 -64.26,-61 -64.89,-61 -65.52,-61 -66.15,-61 -66.78,-61 -67.41,-61 -68.04,-61 -68.67,-61 -69.3,-61.55 -69.3,-62.1 -69.3,-62.65 -69.3,-63.2 -69.3,-63.75 -69.3,-64.3 -69.3,-64.85 -69.3,-65.4 -69.3,-65.95 -69.3,-66.5 -69.3,-66.5 -68.67,-66.5 -68.04,-66.5 -67.41,-66.5 -66.78,-66.5 -66.15,-66.5 -65.52,-66.5 -64.89,-66.5 -64.26,-66.5 -63.63,-66.5 -63))"] |
|
Data from Amsler et al. 2019 Antarctic Science, doi:10.1017/S0954102019000014
|
1341333 |
2019-03-04 | Amsler, Charles |
Collaborative Research: The Chemical Ecology of Shallow-water Marine Macroalgae and Invertebrates on the Antarctic Peninsula - continuing |
These three spreadsheets contain all the data used in Amsler et al. 2019. Impacts of macroalgal-associated gastropods on epiphytic microalgae on the ecologically important Antarctic brown alga Himantothallus grandifolius. Antarctic Science 31: doi:10.1017/S0954102019000014 | ["POLYGON((-65 -63,-64.8 -63,-64.6 -63,-64.4 -63,-64.2 -63,-64 -63,-63.8 -63,-63.6 -63,-63.4 -63,-63.2 -63,-63 -63,-63 -63.2,-63 -63.4,-63 -63.6,-63 -63.8,-63 -64,-63 -64.2,-63 -64.4,-63 -64.6,-63 -64.8,-63 -65,-63.2 -65,-63.4 -65,-63.6 -65,-63.8 -65,-64 -65,-64.2 -65,-64.4 -65,-64.6 -65,-64.8 -65,-65 -65,-65 -64.8,-65 -64.6,-65 -64.4,-65 -64.2,-65 -64,-65 -63.8,-65 -63.6,-65 -63.4,-65 -63.2,-65 -63))"] |
|
FjordEco Phytoplankton Ecology Dataset in Andvord Bay
|
1443705 |
2019-02-27 | Vernet, Maria; Pan, B. Jack; Manck, Lauren; Forsch, Kiefer |
Collaborative Research: Fjord Ecosystem Structure and Function on the West Antarctic Peninsula - Hotspots of Productivity and Biodiversity? (FjordEco) |
Phytoplankton ecology dataset from the FjordEco Project (PLR-1443705) | ["POLYGON((-63.3 -64.5,-63.17 -64.5,-63.04 -64.5,-62.91 -64.5,-62.78 -64.5,-62.65 -64.5,-62.52 -64.5,-62.39 -64.5,-62.26 -64.5,-62.13 -64.5,-62 -64.5,-62 -64.545,-62 -64.59,-62 -64.635,-62 -64.68,-62 -64.725,-62 -64.77,-62 -64.815,-62 -64.86,-62 -64.905,-62 -64.95,-62.13 -64.95,-62.26 -64.95,-62.39 -64.95,-62.52 -64.95,-62.65 -64.95,-62.78 -64.95,-62.91 -64.95,-63.04 -64.95,-63.17 -64.95,-63.3 -64.95,-63.3 -64.905,-63.3 -64.86,-63.3 -64.815,-63.3 -64.77,-63.3 -64.725,-63.3 -64.68,-63.3 -64.635,-63.3 -64.59,-63.3 -64.545,-63.3 -64.5))"] |
|
Fjord-Eco_Sediment_OrgC_OrgN_Data - Craig Smith
|
1443680 |
2019-02-13 | Smith, Craig |
Collaborative Research: Fjord Ecosystem Structure and Function on the West Antarctic Peninsula - Hotspots of Productivity and Biodiversity? (FjordEco) |
Sediment organic carbon and organic nitrogen content (percent mass) in 6 depth intervals (0-1cm, 1-2cm, 3-4cm, 5-6cm, 7-8cm , 9-10cm) in sediment cores collected by OSIL Megacore (10 cm diameter tubes) along the five-station FjordEco Transect from inner Andvord Bay to the open continental shelf at FOODBANCS Station B. | ["POLYGON((-65 -64,-64.7 -64,-64.4 -64,-64.1 -64,-63.8 -64,-63.5 -64,-63.2 -64,-62.9 -64,-62.6 -64,-62.3 -64,-62 -64,-62 -64.1,-62 -64.2,-62 -64.3,-62 -64.4,-62 -64.5,-62 -64.6,-62 -64.7,-62 -64.8,-62 -64.9,-62 -65,-62.3 -65,-62.6 -65,-62.9 -65,-63.2 -65,-63.5 -65,-63.8 -65,-64.1 -65,-64.4 -65,-64.7 -65,-65 -65,-65 -64.9,-65 -64.8,-65 -64.7,-65 -64.6,-65 -64.5,-65 -64.4,-65 -64.3,-65 -64.2,-65 -64.1,-65 -64))"] |
|
Antarctic Ice Sheet simulations for role of freshwater in future warming scenarios
|
1443394 |
2019-02-04 | Pollard, David |
Collaborative Research: Assessing the Global Climate Response to Melting of the Antarctic Ice Sheet |
The dataset consists of two tar files for two distinct sets of simulations. Each tar file contains a number of Netcdf files with model output for one simulation each, and also contains a DIF file (Directory Interchange Format, in xml form) with information on that part of the dataset. Set 1: There are 4 Netcdf files with output from the PSU 3D Antarctic ice sheet model including ice melange, showing role of melange in potentially providing buttressing and possibly slowing down ice retreat in strong climate warming scenarios. Set two: There are 2 Netcdf files with output from the PSU 3D Antarctic ice sheet model, for two future warming scenarios RCP4.5 and RCP8.5, contributing to oceanic meltwater discharge fields for future climate and ocean model simulations performed at Univ. Massachusetts by other PIs on the NSF project. More details on file names and model fields is provided in "Data Section" of the Readme file. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Metadata accompanying BioProject SUB4579142
|
1656344 |
2019-02-04 | Bowman, Jeff |
A Preliminary Assessment of the Influence of Ice Cover on Microbial Carbon and Energy Acquisition during the Antarctic Winter-spring Seasonal Transition |
This dataset contains bacterial production, primary production, chlorophyll biomass, and photosynthetic parameters for samples archived in NCBI SRA as SUB4579142. | ["POLYGON((-64.1 -64.75,-64.08 -64.75,-64.06 -64.75,-64.04 -64.75,-64.02 -64.75,-64 -64.75,-63.98 -64.75,-63.96 -64.75,-63.94 -64.75,-63.92 -64.75,-63.9 -64.75,-63.9 -64.775,-63.9 -64.8,-63.9 -64.825,-63.9 -64.85,-63.9 -64.875,-63.9 -64.9,-63.9 -64.925,-63.9 -64.95,-63.9 -64.975,-63.9 -65,-63.92 -65,-63.94 -65,-63.96 -65,-63.98 -65,-64 -65,-64.02 -65,-64.04 -65,-64.06 -65,-64.08 -65,-64.1 -65,-64.1 -64.975,-64.1 -64.95,-64.1 -64.925,-64.1 -64.9,-64.1 -64.875,-64.1 -64.85,-64.1 -64.825,-64.1 -64.8,-64.1 -64.775,-64.1 -64.75))"] |
|
South Pole (SPICECORE) 15N, 18O, O2/N2 and Ar/N2
|
1443710 |
2019-02-02 | Severinghaus, Jeffrey |
Collaborative Research: Inert Gas and Methane Based Climate Records throughout the South Pole Deep Ice Core |
This data set includes major atmospheric gas and gas isotope data from the SPICECORE project, which recovered a 1750-m ice core at the South Pole in 2015. 15N, 18O of O2, O2/N2, and Ar/N2 are included. | ["POINT(0 -90)"] |
|
Palynological samples
|
1048343 |
2019-02-01 | Warny, Sophie |
CAREER: Deciphering Antarctic Climate Variability during the Temperate/Polar Transition and Improving Climate Change Literacy in Louisiana through a Companion Outreach Program |
Thanks to grant # U.S. National Science Foundation ANT-1048343, our group was selected to study about 700 of the recently-acquired sediment samples in Antarctica, covering ~9 regions and geological time frames ranging from the Paleocene to today. The samples were processed for palynological analyses and the slides are curated at the LSU CENEX center. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Size scaling of oxygen physiology and metabolic rate of Antarctic sea spiders
|
1341485 |
2019-01-06 | Lane, Steven J.; Moran, Amy; Shishido, Caitlin; Woods, H. Arthur |
Collaborative Research: Body Size, Oxygen, and Vulnerability to Climate Change in Antarctic Pycnogonida |
Data used in Lane, SJ, CM Shishido, AL Moran, BW Tobalske, CP Arango, HA Woods (2017) Upper limits to body size imposed by respiratory-structural trade-offs in Antarctic pycnogonids. Proceedings of the Royal Society B 284, No. 1865, p. 20171779, DOI: 10.1098/rspb.2017.1779. File includes data on species identification, body mass, leg dimensions, oxygen gradients across the cuticle, and metabolic rate. | ["POINT(166.666 -77.8499966)"] |
|
Physiological, biomechanical, and locomotory data on Antarctic sea spiders fouled and unfouled with epibionts
|
1341485 |
2019-01-06 | Lane, Steven J.; Tobalske, Bret; Moran, Amy; Shishido, Caitlin; Woods, H. Arthur |
Collaborative Research: Body Size, Oxygen, and Vulnerability to Climate Change in Antarctic Pycnogonida |
Data used in Lane, SJ, BW Tobalske, AL Moran, CM Shishido, HA Woods (2018) Costs of epibionts on Antarctic sea spiders. Marine Biology 165, 137 https://doi.org/10.1007/s00227-018-3389-9. Data sets include (1) measurements of drag on individual sea spiders with or without epibiotic barnacles and other fouling; (2) data on locomotion by fouled and unfouled sea spiders; (3) functional diffusion coefficients of oxygen through fouled and unfouled cuticle; and (4) levels of oxygen at the cuticle surface of fouled and unfouled individuals. | ["POINT(166.666 -77.8499966)"] |
|
AU1402 mooring data
|
1313826 |
2018-12-24 | Orsi, Alejandro |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
An array of three moorings (M1-M3) with current meters, temperature, conductivity, and pressure (TCP) recorders were deployed along the eastern flank of the continental shelf off Sabrina Coast, at the main path of the Antarctic Coastal Current indicated by the uCTD data collected earlier during the cruise. These three US mooring were deployed at the 625-m (M1), 620-m (M2) and 1051-m (M3) isobaths. M1 was recovered on 25 February 2014, with a full data return from all of its instruments; whereas M2 and M3 were recovered in early 2015 on board of the Australian RVI Aurora Australis next year (cruise AU1402). The location and schematics of the mooring array design is described below, and also provided among the uploaded files. | ["POLYGON((119 -66,119.3 -66,119.6 -66,119.9 -66,120.2 -66,120.5 -66,120.8 -66,121.1 -66,121.4 -66,121.7 -66,122 -66,122 -66.1,122 -66.2,122 -66.3,122 -66.4,122 -66.5,122 -66.6,122 -66.7,122 -66.8,122 -66.9,122 -67,121.7 -67,121.4 -67,121.1 -67,120.8 -67,120.5 -67,120.2 -67,119.9 -67,119.6 -67,119.3 -67,119 -67,119 -66.9,119 -66.8,119 -66.7,119 -66.6,119 -66.5,119 -66.4,119 -66.3,119 -66.2,119 -66.1,119 -66))"] |
|
AU1402 Final UCTD data
|
1143833 |
2018-12-24 | Orsi, Alejandro |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
Underway Salinity (Conductivity), Temperature, Depth (Pressure) profiles from AU1402, final, reduced, quality control version. Data are reported as an ascii table suitable for import to Ocean Data View. | ["POLYGON((119 -66,119.3 -66,119.6 -66,119.9 -66,120.2 -66,120.5 -66,120.8 -66,121.1 -66,121.4 -66,121.7 -66,122 -66,122 -66.1,122 -66.2,122 -66.3,122 -66.4,122 -66.5,122 -66.6,122 -66.7,122 -66.8,122 -66.9,122 -67,121.7 -67,121.4 -67,121.1 -67,120.8 -67,120.5 -67,120.2 -67,119.9 -67,119.6 -67,119.3 -67,119 -67,119 -66.9,119 -66.8,119 -66.7,119 -66.6,119 -66.5,119 -66.4,119 -66.3,119 -66.2,119 -66.1,119 -66))"] |
|
NBP1402 Final UCTD data
|
1143833 |
2018-12-23 | Orsi, Alejandro |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
Underway Salinity (Conductivity), Temperature, Depth (Pressure) profiles from NBP1402, final, reduced, quality control version. Data are reported as an ascii table suitable for import to Ocean Data View. | ["POLYGON((117 -64,119.9 -64,122.8 -64,125.7 -64,128.6 -64,131.5 -64,134.4 -64,137.3 -64,140.2 -64,143.1 -64,146 -64,146 -64.4,146 -64.8,146 -65.2,146 -65.6,146 -66,146 -66.4,146 -66.8,146 -67.2,146 -67.6,146 -68,143.1 -68,140.2 -68,137.3 -68,134.4 -68,131.5 -68,128.6 -68,125.7 -68,122.8 -68,119.9 -68,117 -68,117 -67.6,117 -67.2,117 -66.8,117 -66.4,117 -66,117 -65.6,117 -65.2,117 -64.8,117 -64.4,117 -64))"] |
|
Cuticle morphology and oxygen gradients of Antarctic sea spiders
|
1341485 |
2018-12-22 | Woods, H. Arthur; Arthur Woods, H. |
Collaborative Research: Body Size, Oxygen, and Vulnerability to Climate Change in Antarctic Pycnogonida |
Raw data from Lane, SJ, AL Moran, CM Shishido, BW Tobalske, HA Woods (2018) Cuticular gas exchange by Antarctic sea spiders. Journal of Experimental Biology. jeb.177568 doi: 10.1242/jeb.177568. The file contains data on pore morphology, cuticle thickness, oxygen gradients across the cuticle, and estimated resistances of the cuticle to oxygen flux. Most of the sea spiders were collected near McMurdo Station, with a few extras collected at New Harbor, Antarctica. | ["POLYGON((163.85 -77.6,164.134 -77.6,164.418 -77.6,164.702 -77.6,164.986 -77.6,165.27 -77.6,165.554 -77.6,165.838 -77.6,166.122 -77.6,166.406 -77.6,166.69 -77.6,166.69 -77.624,166.69 -77.648,166.69 -77.672,166.69 -77.696,166.69 -77.72,166.69 -77.744,166.69 -77.768,166.69 -77.792,166.69 -77.816,166.69 -77.84,166.406 -77.84,166.122 -77.84,165.838 -77.84,165.554 -77.84,165.27 -77.84,164.986 -77.84,164.702 -77.84,164.418 -77.84,164.134 -77.84,163.85 -77.84,163.85 -77.816,163.85 -77.792,163.85 -77.768,163.85 -77.744,163.85 -77.72,163.85 -77.696,163.85 -77.672,163.85 -77.648,163.85 -77.624,163.85 -77.6))"] |
|
Model output NOAA GFDL CM2_6 Cant Hant storage
|
1425989 |
2018-12-14 | Chen, Haidi |
Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) |
This dataset include the budget terms for heat, carbon and phosphate storage tendency in pre-industrial simulation and climate change simulation forced with atmospheric CO2 increasing at a rate of 1% per year run following 120 years of the pre-industrial simulation. The results are zonally integrated. The dataset also include the meridional overturning circulation in the control and climate simulations. | ["POLYGON((-180 -20,-144 -20,-108 -20,-72 -20,-36 -20,0 -20,36 -20,72 -20,108 -20,144 -20,180 -20,180 -27,180 -34,180 -41,180 -48,180 -55,180 -62,180 -69,180 -76,180 -83,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -83,-180 -76,-180 -69,-180 -62,-180 -55,-180 -48,-180 -41,-180 -34,-180 -27,-180 -20))"] |
|
Physiological and biochemical measurements on Pycnogonida from McMurdo Sound
|
1341476 1341485 |
2018-12-07 | Moran, Amy; Woods, H. Arthur; Tobalske, Bret |
Collaborative Research: Body Size, Oxygen, and Vulnerability to Climate Change in Antarctic Pycnogonida |
This dataset contains morphometric (mass, surface area, cuticle thickness, cuticle morphometrics) and physiological (oxygen consumption) data for Antarctic pycnognonids collected in McMurdo Sound, Antarctica . | ["POINT(166.67 -77.85)"] |
|
Nearshore pH, temperature, (salinity, depth) at mooring sites in McMurdo Sound, Antarctica, Overwinter 2011-2016
|
1246202 0944201 |
2018-12-05 | Hoshijima, Umihiko; Hofmann, Gretchen; Kapsenberg, Lydia |
Ocean Acidification Seascape: Linking Natural Variability and Anthropogenic changes in pH and Temperature to Performance in Calcifying Antarctic Marine Invertebrates |
This dataset consists of measurements made of pH (total scale) and temperature at various sites in McMurdo Sound, Antarctica with autonomous DuraFET® - based pH sensors. Sensors logged every 4 hours and ran until batteries were exhausted. Sensors were calibrated with water samples following best practices from Dickson et al (2007). Details of select years from this dataset are provided in Kapsenberg et al(2015). | ["POLYGON((163.5281 -77.5715,163.84105 -77.5715,164.154 -77.5715,164.46695 -77.5715,164.7799 -77.5715,165.09285 -77.5715,165.4058 -77.5715,165.71875 -77.5715,166.0317 -77.5715,166.34465 -77.5715,166.6576 -77.5715,166.6576 -77.59928,166.6576 -77.62706,166.6576 -77.65484,166.6576 -77.68262,166.6576 -77.7104,166.6576 -77.73818,166.6576 -77.76596,166.6576 -77.79374,166.6576 -77.82152,166.6576 -77.8493,166.34465 -77.8493,166.0317 -77.8493,165.71875 -77.8493,165.4058 -77.8493,165.09285 -77.8493,164.7799 -77.8493,164.46695 -77.8493,164.154 -77.8493,163.84105 -77.8493,163.5281 -77.8493,163.5281 -77.82152,163.5281 -77.79374,163.5281 -77.76596,163.5281 -77.73818,163.5281 -77.7104,163.5281 -77.68262,163.5281 -77.65484,163.5281 -77.62706,163.5281 -77.59928,163.5281 -77.5715))"] |
|
Ice Temperature in Shallow Boreholes Near Blood Falls at the Terminus of Taylor Glacier, McMurdo Dry Valleys, Antarctica
|
1144192 |
2018-11-28 | Tulaczyk, Slawek |
Collaborative Research: MIDGE: Minimally Invasive Direct Glacial Exploration of Biogeochemistry, Hydrology and Glaciology of Blood Falls, McMurdo Dry Valleys |
["POINT(162.2673 -77.722528)"] | |
|
Scanning electron micrographs: Influence of heavy metal (Pb, Cd) exposure on shell morphogenesis in Astrammina rara, a giant agglutinated Antarctic foraminiferan protist.
|
1341612 |
2018-11-28 | Bowser, Samuel; Andreas, Amanda |
Assembling and Mining the Genomes of Giant Antarctic Foraminifera |
This data set comprises scanning electron micrographs of Astrammina rara exposed to sub-lethal concentrations of lead and cadmium. Specimens were shucked (i.e., shells removed) and incubated with metal-free plastic beads for two weeks. Control (no Pb or Cd) and experimental (1 and 5 ug/ml Pb; 0.5 and 1 ug/ml Cd) specimens were prepared for SEM using fixation and dehydration in ethanol (i.e., no aldehydes) and were imaged uncoated at 3keV. | ["POINT(163.5117 -77.57623)"] |
|
Weddell seal summer diving behavior
|
1246463 |
2018-11-24 | Beltran, Roxanne; Burns, Jennifer |
The Cost of A New Fur Coat: Interactions between Molt and Reproduction in Weddell Seals |
We examined the influence of sea ice break-out on seasonal diving patterns and diet of a top predator, the Weddell seal, to understand how phytoplankton blooms impact the vertical distribution of the food web. We captured female seals during the November and December lactation period and attached a LOTEK LAT1800 time-depth recorder (TDR) flipper tag with a 6 second sampling interval. Data were processed using the Iknos toolbox in MATLAB. Benthic dives (1% of all dives) were excluded from analyses because we were interested in quantifying seasonal changes in mid-water dives. Thus, we analyzed dives from 59 Weddell seals to characterize the diving depth and foraging effort of each seal across the austral summer over four years. We characterized seasonal changes in diving depth by calculating the mean across all seals of the maximum dive depth on each day for each seal. For more information see: Beltran, R. S. Bridging the gap between pupping and molting phenology: behavioral and ecological drivers in Weddell seals PhD thesis, University of Alaska Fairbanks, (2018). | [] |
|
Ice-ocean-ecosystem model output
|
1341440 |
2018-11-20 | Jin, Meibing |
Collaborative Research: Phytoplankton Phenology in the Antarctic: Drivers, Patterns, and Implications for the Adelie Penguin |
["POLYGON((-180 -45,-144 -45,-108 -45,-72 -45,-36 -45,0 -45,36 -45,72 -45,108 -45,144 -45,180 -45,180 -49.5,180 -54,180 -58.5,180 -63,180 -67.5,180 -72,180 -76.5,180 -81,180 -85.5,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -85.5,-180 -81,-180 -76.5,-180 -72,-180 -67.5,-180 -63,-180 -58.5,-180 -54,-180 -49.5,-180 -45))"] | |
|
Experimental analyses of phytoplankton temperature response
|
1142174 |
2018-11-14 | Smith, Walker |
Collaborative Research: Penguin Foraging Reveals Phytoplankton Spatial Structure in the Ross Sea |
This data set summarizes the responses of a variety of phytoplankton cultures to different temperatures. Variables assessed in triplicate at each temperature include cell abundance, chlorophyll and particulate organic carbon. Some eight species were assessed. Each experiment lasted ca. 25 days. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Cortisol levels in Weddell seal fur
|
1246463 |
2018-11-08 | Burns, Jennifer |
The Cost of A New Fur Coat: Interactions between Molt and Reproduction in Weddell Seals |
This dataset includes measurements of cortisol levels (pg/mg) extracted from Weddell Seal fur samples collected from adult females in colonies in the Erebus Bay region of Antarctica during 4 austral field seasons between November 2013 and February 2017. Observations recorded include body mass, body composition, reproductive status. | ["POLYGON((-180 -76,-177 -76,-174 -76,-171 -76,-168 -76,-165 -76,-162 -76,-159 -76,-156 -76,-153 -76,-150 -76,-150 -76.2,-150 -76.4,-150 -76.6,-150 -76.8,-150 -77,-150 -77.2,-150 -77.4,-150 -77.6,-150 -77.8,-150 -78,-153 -78,-156 -78,-159 -78,-162 -78,-165 -78,-168 -78,-171 -78,-174 -78,-177 -78,180 -78,178 -78,176 -78,174 -78,172 -78,170 -78,168 -78,166 -78,164 -78,162 -78,160 -78,160 -77.8,160 -77.6,160 -77.4,160 -77.2,160 -77,160 -76.8,160 -76.6,160 -76.4,160 -76.2,160 -76,162 -76,164 -76,166 -76,168 -76,170 -76,172 -76,174 -76,176 -76,178 -76,-180 -76))"] |
|
Weddell Seal Molt Survey Data
|
1246463 |
2018-10-30 | Burns, Jennifer |
The Cost of A New Fur Coat: Interactions between Molt and Reproduction in Weddell Seals |
All sightings of known, tagged, Weddell seals during molt seasons of Austral summers 2013, 14 15, and 2016. Seals that were sighted but for which molt status could not be determined are not included in this dataset. Seals without tags or IDs were not included. | ["POLYGON((164 -76,164.2 -76,164.4 -76,164.6 -76,164.8 -76,165 -76,165.2 -76,165.4 -76,165.6 -76,165.8 -76,166 -76,166 -76.2,166 -76.4,166 -76.6,166 -76.8,166 -77,166 -77.2,166 -77.4,166 -77.6,166 -77.8,166 -78,165.8 -78,165.6 -78,165.4 -78,165.2 -78,165 -78,164.8 -78,164.6 -78,164.4 -78,164.2 -78,164 -78,164 -77.8,164 -77.6,164 -77.4,164 -77.2,164 -77,164 -76.8,164 -76.6,164 -76.4,164 -76.2,164 -76))"] |
|
U-Pb ages and mineral compositions from Dufek Intrusion
|
1543313 |
2018-10-29 | VanTongeren, Jill |
Collaborative Research: Testing the Hypothesis that Bigger Magma Chambers Crystallize Faster |
The dataset contains preliminary CA-ID-TIMS U-Pb zircon ages for 4 samples from the Dufek Intrusion, as well as major element mineral compositions for samples throughout the stratigraphy. | ["POLYGON((-55 -82,-54.5 -82,-54 -82,-53.5 -82,-53 -82,-52.5 -82,-52 -82,-51.5 -82,-51 -82,-50.5 -82,-50 -82,-50 -82.2,-50 -82.4,-50 -82.6,-50 -82.8,-50 -83,-50 -83.2,-50 -83.4,-50 -83.6,-50 -83.8,-50 -84,-50.5 -84,-51 -84,-51.5 -84,-52 -84,-52.5 -84,-53 -84,-53.5 -84,-54 -84,-54.5 -84,-55 -84,-55 -83.8,-55 -83.6,-55 -83.4,-55 -83.2,-55 -83,-55 -82.8,-55 -82.6,-55 -82.4,-55 -82.2,-55 -82))"] |
|
Weddell Seal Molt Phenology Dataset
|
1246463 |
2018-10-22 | Burns, Jennifer |
The Cost of A New Fur Coat: Interactions between Molt and Reproduction in Weddell Seals |
Animals can respond to dynamic environments through phenological plasticity of life history events; however, changes in one part of the annual cycle can diminish the success of subsequent life history events. Our aims were to determine the associations between reproduction and moult phenology across years and to quantify phenological plasticity across varying environmental conditions. We conducted demographic surveys of 4,252 flipper-tagged Weddell seals (Leptonychotes weddellii) in the Ross Sea, Antarctica during four austral summers. At each sighting, seals were assigned a moult code based on the visible presence of new fur, and the start date of each animal’s moult was back-calculated. This dataset contains data on pupping and moult timing for each animal used to address this question. | [] |
|
Stable water isotope data for the surface samples collected at the Allan Hills Blue ice area
|
1443263 1443306 |
2018-10-17 | Kurbatov, Andrei V.; Mayewski, Paul A.; Introne, Douglas; Yan, Yuzhen |
Collaborative Research: Window into the World with 40,000-year Glacial Cycles from Climate Records in Million Year-old Ice from the Allan Hills Blue Ice Area |
Stable water isotope data for the surface ice samples (listed as point numbers coordinates provided) collected at the Allan Hills Blue ice area have been generated under a collaborative effort by the University of Maine Climate Change Institute (NSF Award#1443306) and Princeton University (NSF Award# 1443263). This data set contains stable isotope data (dD, d18O) of meltwater samples collected from the area(76.73165 to 76.73348 S, 159.35343 to 159.42112 E). | ["POLYGON((159.35343 -76.73165,159.360199 -76.73165,159.366968 -76.73165,159.373737 -76.73165,159.380506 -76.73165,159.387275 -76.73165,159.394044 -76.73165,159.400813 -76.73165,159.407582 -76.73165,159.414351 -76.73165,159.42112 -76.73165,159.42112 -76.731833,159.42112 -76.732016,159.42112 -76.732199,159.42112 -76.732382,159.42112 -76.732565,159.42112 -76.732748,159.42112 -76.732931,159.42112 -76.733114,159.42112 -76.733297,159.42112 -76.73348,159.414351 -76.73348,159.407582 -76.73348,159.400813 -76.73348,159.394044 -76.73348,159.387275 -76.73348,159.380506 -76.73348,159.373737 -76.73348,159.366968 -76.73348,159.360199 -76.73348,159.35343 -76.73348,159.35343 -76.733297,159.35343 -76.733114,159.35343 -76.732931,159.35343 -76.732748,159.35343 -76.732565,159.35343 -76.732382,159.35343 -76.732199,159.35343 -76.732016,159.35343 -76.731833,159.35343 -76.73165))"] |
|
Stable water isotope data for the AH-1502 ice core drilled at the Allan Hills Blue ice area
|
1443306 1443263 |
2018-10-17 | Kurbatov, Andrei V.; Mayewski, Paul A.; Introne, Douglas; Yan, Yuzhen |
Collaborative Research: Window into the World with 40,000-year Glacial Cycles from Climate Records in Million Year-old Ice from the Allan Hills Blue Ice Area |
Stable water isotope data for the ice core drilled at the Allan Hills Blue ice area have been generated under a collaborative effort by the University of Maine Climate Change Institute (NSF Award#1443306) and Princeton University (NSF Award# 1443263). This data set contains stable isotope data (dD, d18O) of meltwater samples collected from the ice core AH-1502 (76.73286 S, 159.35507 E) was drilled in 2015-16 field season to 197 meters below the surface. | ["POINT(159.35507 -76.73286)"] |
|
Stable water isotope data for the AH-1503 ice core drilled at the Allan Hills Blue ice area
|
1443263 1443306 |
2018-10-16 | Kurbatov, Andrei V.; Mayewski, Paul A.; Introne, Douglas; Yan, Yuzhen |
Collaborative Research: Window into the World with 40,000-year Glacial Cycles from Climate Records in Million Year-old Ice from the Allan Hills Blue Ice Area |
Stable water isotope data for the AH-1503 ice core drilled at the Allan Hills Blue ice area have been generated under a collaborative effort by the University of Maine Climate Change Institute (NSF Award#1443263) and Princeton University (NSF Award# 1443263). This data set contains stable isotope data (dD, d18O) of meltwater samples collected from the ice core AH-1503 (76.73243 S, 159.3562 E). Ice core site AH-1503 used the same borehole as AH- BIT58 drilled down to 124 m during the 2011-12 field season. All drilling was conducted with a 3" Eclipse drill (Ice Drilling Design and Operations (IDDO)). | ["POINT(159.3562 -76.73243)"] |
|
Geophysical measurements Beardmore Glacier, Antarctica
|
1141866 |
2018-09-09 | Conway, Howard |
Collaborative Research: East Antarctic Outlet Glacier Dynamics |
This data set contains radar-detected measurements of surface topography, ice thickness and derived bed topography across Beardmore Glacier and its tributary Mill Glacier. | ["POLYGON((165.656 -83.357,166.3059 -83.357,166.9558 -83.357,167.6057 -83.357,168.2556 -83.357,168.9055 -83.357,169.5554 -83.357,170.2053 -83.357,170.8552 -83.357,171.5051 -83.357,172.155 -83.357,172.155 -83.6036,172.155 -83.8502,172.155 -84.0968,172.155 -84.3434,172.155 -84.59,172.155 -84.8366,172.155 -85.0832,172.155 -85.3298,172.155 -85.5764,172.155 -85.823,171.5051 -85.823,170.8552 -85.823,170.2053 -85.823,169.5554 -85.823,168.9055 -85.823,168.2556 -85.823,167.6057 -85.823,166.9558 -85.823,166.3059 -85.823,165.656 -85.823,165.656 -85.5764,165.656 -85.3298,165.656 -85.0832,165.656 -84.8366,165.656 -84.59,165.656 -84.3434,165.656 -84.0968,165.656 -83.8502,165.656 -83.6036,165.656 -83.357))"] |
|
Basal melt rates of the Ross Ice Shelf near the Whillans Ice Stream grounding line
|
0838947 |
2018-09-09 | Begeman, Carolyn |
Collaborative Research: Integrative Study of Marine Ice Sheet Stability & Subglacial Life Habitats in W Antarctica - Lake & Ice Stream Subglacial Access Research Drilling (LISSARD) |
This dataset contains ice-shelf basal melt rates and vertical strain rates for 11 sites near the Whillans Ice Stream grounding line. These rates were determined using Autonomous Phase-Sensitive Radar. Data processing is described in Begeman et al. 2018, JGR Oceans. These sites are concentrated within an embayment of the Ross Ice Shelf. These melt rates and strain rates were determined over periods ranging from 10 to 38 days in December 2014 to January 2015. | ["POLYGON((-165.28 -84.24,-165.086 -84.24,-164.892 -84.24,-164.698 -84.24,-164.504 -84.24,-164.31 -84.24,-164.116 -84.24,-163.922 -84.24,-163.728 -84.24,-163.534 -84.24,-163.34 -84.24,-163.34 -84.252,-163.34 -84.264,-163.34 -84.276,-163.34 -84.288,-163.34 -84.3,-163.34 -84.312,-163.34 -84.324,-163.34 -84.336,-163.34 -84.348,-163.34 -84.36,-163.534 -84.36,-163.728 -84.36,-163.922 -84.36,-164.116 -84.36,-164.31 -84.36,-164.504 -84.36,-164.698 -84.36,-164.892 -84.36,-165.086 -84.36,-165.28 -84.36,-165.28 -84.348,-165.28 -84.336,-165.28 -84.324,-165.28 -84.312,-165.28 -84.3,-165.28 -84.288,-165.28 -84.276,-165.28 -84.264,-165.28 -84.252,-165.28 -84.24))"] |
|
Location of surface crevasses in Antarctica
|
None | 2018-09-05 | Emetc, Veronika | No project link provided | In this data set we present observations of locations of surface crevasses in Antarctica collected from satellite images for the period between 2011 and 2015 for 46 ice shelf regions. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Supraglacial Lake Depths on McMurdo Ice Shelf, Antarctica
|
1443126 |
2018-09-04 | MacAyeal, Douglas; Banwell, Alison |
Impact of Supraglacial Lakes on Ice-Shelf Stability |
During the melt seasons of 2015/6 and 2016/7, water pressure gages were deployed on the McMurdo Ice Shelf to observe water depth in supraglacial lakes and streams. This was done in support of research directed toward understanding how filling and draining supraglacial lakes would induce ice-shelf flexure and fracture. | ["POLYGON((165.911079 -77.872851,165.941267 -77.872851,165.971455 -77.872851,166.001643 -77.872851,166.031831 -77.872851,166.062019 -77.872851,166.092207 -77.872851,166.122395 -77.872851,166.152583 -77.872851,166.182771 -77.872851,166.212959 -77.872851,166.212959 -77.8781411,166.212959 -77.8834312,166.212959 -77.8887213,166.212959 -77.8940114,166.212959 -77.8993015,166.212959 -77.9045916,166.212959 -77.9098817,166.212959 -77.9151718,166.212959 -77.9204619,166.212959 -77.925752,166.182771 -77.925752,166.152583 -77.925752,166.122395 -77.925752,166.092207 -77.925752,166.062019 -77.925752,166.031831 -77.925752,166.001643 -77.925752,165.971455 -77.925752,165.941267 -77.925752,165.911079 -77.925752,165.911079 -77.9204619,165.911079 -77.9151718,165.911079 -77.9098817,165.911079 -77.9045916,165.911079 -77.8993015,165.911079 -77.8940114,165.911079 -77.8887213,165.911079 -77.8834312,165.911079 -77.8781411,165.911079 -77.872851))"] |
|
Antarctic MIZ, Pack Ice and Polynya Maps from Passive Microwave Satellite Data
|
1341547 |
2018-08-31 | Stroeve, Julienne |
Collaborative Research: Phytoplankton Phenology in the Antarctic: Drivers, Patterns, and Implications for the Adelie Penguin |
Sea ice variability within the marginal ice zone (MIZ) and polynyas plays an important role for phytoplankton productivity and krill abundance. Therefore, mapping their spatial extent, seasonal and interannual variability is essential for understanding how current and future changes in these biologically active regions may impact the Antarctic marine ecosystem. Knowledge of the distribution of MIZ, consolidated pack ice and coastal polynyas to the total Antarctic sea ice cover may also help to shed light on the factors contributing towards recent expansion of the Antarctic ice cover in some regions and contraction in others. The long-term passive microwave 21 satellite data record provides the longest and most consistent record for assessing the proportion of the sea ice cover that is covered by each of these ice categories. This data set provides estimates of the MIZ, consolidated pack ice and polynyas from the NASA Team and Bootstrap sea ice concentration data sets, from 1979 to 2017. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Time-lapse video of McMurdo Ice Shelf surface melting and hydrology
|
1443126 |
2018-08-31 | MacAyeal, Douglas; Banwell, Alison |
Impact of Supraglacial Lakes on Ice-Shelf Stability |
During the Austral summer melt season of 2016-2017, an automatic camera was placed overlooking a surface lake feature on the McMurdo Ice Shelf. This camera created a time-lapse video (30 minute photograph time intervals) used to observe the filling and draining of the lake called Rift-Tip Lake located approximately 2 km from the McMurdo Ice Shelf ice front. The data was used in support of a field project to measure the flexural response of the McMurdo Ice Shelf (and ice shelves in general) to the filling and draining of supraglacial lakes. The time-lapse video begins 16 November 2016 and ends 27 January 2017. | ["POLYGON((166.152184 -77.902339,166.1559273 -77.902339,166.1596706 -77.902339,166.1634139 -77.902339,166.1671572 -77.902339,166.1709005 -77.902339,166.1746438 -77.902339,166.1783871 -77.902339,166.1821304 -77.902339,166.1858737 -77.902339,166.189617 -77.902339,166.189617 -77.9026372,166.189617 -77.9029354,166.189617 -77.9032336,166.189617 -77.9035318,166.189617 -77.90383,166.189617 -77.9041282,166.189617 -77.9044264,166.189617 -77.9047246,166.189617 -77.9050228,166.189617 -77.905321,166.1858737 -77.905321,166.1821304 -77.905321,166.1783871 -77.905321,166.1746438 -77.905321,166.1709005 -77.905321,166.1671572 -77.905321,166.1634139 -77.905321,166.1596706 -77.905321,166.1559273 -77.905321,166.152184 -77.905321,166.152184 -77.9050228,166.152184 -77.9047246,166.152184 -77.9044264,166.152184 -77.9041282,166.152184 -77.90383,166.152184 -77.9035318,166.152184 -77.9032336,166.152184 -77.9029354,166.152184 -77.9026372,166.152184 -77.902339))"] |
|
Andvord Bay Glacier Timelapse
|
1443733 |
2018-08-07 | Truffer, Martin; Winsor, Peter |
Collaborative Research: Fjord Ecosystem Structure and Function on the West Antarctic Peninsula - Hotspots of Productivity and Biodiversity? (FjordEco) |
This dataset includes timelapse images from five cameras set up at four different locations in and just outside of Andvord Bay on the Western Antarctic Peninsula. The cameras were set up to track glacier ice motion, calving and tracking of ice bergs, and sea ice formation and melt. Two cameras (hi-res) were Canon Rebel DSLR in a timelapse system designed by Harbortronics; the remaining three cameras (lo-res) were from Campbell Scientific and were part of a weather station. | ["POLYGON((-62.68 -64.72,-62.648 -64.72,-62.616 -64.72,-62.584 -64.72,-62.552 -64.72,-62.52 -64.72,-62.488 -64.72,-62.456 -64.72,-62.424 -64.72,-62.392 -64.72,-62.36 -64.72,-62.36 -64.74,-62.36 -64.76,-62.36 -64.78,-62.36 -64.8,-62.36 -64.82,-62.36 -64.84,-62.36 -64.86,-62.36 -64.88,-62.36 -64.9,-62.36 -64.92,-62.392 -64.92,-62.424 -64.92,-62.456 -64.92,-62.488 -64.92,-62.52 -64.92,-62.552 -64.92,-62.584 -64.92,-62.616 -64.92,-62.648 -64.92,-62.68 -64.92,-62.68 -64.9,-62.68 -64.88,-62.68 -64.86,-62.68 -64.84,-62.68 -64.82,-62.68 -64.8,-62.68 -64.78,-62.68 -64.76,-62.68 -64.74,-62.68 -64.72))"] |
|
Tomographic PIV measurements of swimming shelled Antarctic pteropod
|
1246296 |
2018-07-26 | Adhikari, Deepak; Webster, Donald R; Yen, Jeannette |
Collaborative Research: Pteropod Swimming Behavior as a Bio Assay for Ocean Acidification |
A portable tomographic particle image velocimetry (tomographic PIV) system is described. The system was successfully deployed in Antarctica to study shelled Antarctic pteropods (Limacina helicina antarctica) – a delicate organism with an unusual propulsion mechanism. The experimental setup consists of a free-standing frame assembled with optical rails, thus avoiding the need for heavy and bulky equipment (e.g. an optical table). The cameras, lasers, optics, and tanks are all rigidly supported within the frame assembly. The results indicate that the pteropods flap their parapodia (or “wings”) downward during both power and recovery strokes, which is facilitated by the pitching of their shell. Shell pitching significantly alters the flapping trajectory, allowing the pteropod to move vertically and/or horizontally. The pronation and supination of the parapodia, together with the figure eight motion during flapping, suggest similarities with insect flight. The volumetric velocity field surrounding the freely-swimming pteropod reveals the generation of an attached vortex ring connecting the leading edge vortex to the trailing edge vortex during power stroke, and a presence of a leading-edge vortex during recovery stroke. These vortex structures play a major role in accelerating the organism vertically and indicate that forces generated on the parapodia during flapping constitute both lift and drag. After completing each stroke, two vortex rings are shed into the wake of the pteropod. The complex combination of body kinematics (parapodia flapping, shell pitch, saw-tooth trajectory), flow structures, and resulting force balance may be significantly altered by thinning of the pteropod shell, thus making pteropods an indicator of the detrimental effects of ocean acidification. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
McMurdo Ice Shelf GPS survey of vertical motion
|
1443126 |
2018-07-24 | MacAyeal, Douglas; Banwell, Alison |
Impact of Supraglacial Lakes on Ice-Shelf Stability |
Over 2 Austral summer periods in 2015/6 and 2016/17, up to 12 geodetic GPS receivers were deployed on the McMurdo Ice Shelf to study its vertical deflection in response to moving meltwater loads. (5 GPS were deployed in 2015/16, 12 in 2016/17.) The GPS receivers and antennas were supplied by UNAVCO and were Trimble NetR9’s and Zephyr Geodetic, respectively. The GPS receivers were stationary for the entire field seasons (were never moved). Following each field season, the GPS data were processed using MIT software called TRACK, which is part of the GAMIT package. The UNAVCO-run base station at McMurdo Station, approximately 16 km away from the field area, was used as part of the processing. | ["POLYGON((166.02819 -77.887495,166.053634 -77.887495,166.079078 -77.887495,166.104522 -77.887495,166.129966 -77.887495,166.15541 -77.887495,166.180854 -77.887495,166.206298 -77.887495,166.231742 -77.887495,166.257186 -77.887495,166.28263 -77.887495,166.28263 -77.8926145,166.28263 -77.897734,166.28263 -77.9028535,166.28263 -77.907973,166.28263 -77.9130925,166.28263 -77.918212,166.28263 -77.9233315,166.28263 -77.928451,166.28263 -77.9335705,166.28263 -77.93869,166.257186 -77.93869,166.231742 -77.93869,166.206298 -77.93869,166.180854 -77.93869,166.15541 -77.93869,166.129966 -77.93869,166.104522 -77.93869,166.079078 -77.93869,166.053634 -77.93869,166.02819 -77.93869,166.02819 -77.9335705,166.02819 -77.928451,166.02819 -77.9233315,166.02819 -77.918212,166.02819 -77.9130925,166.02819 -77.907973,166.02819 -77.9028535,166.02819 -77.897734,166.02819 -77.8926145,166.02819 -77.887495))"] |
|
McMurdo Ice Shelf AWS data
|
1443126 |
2018-07-20 | Banwell, Alison; MacAyeal, Douglas |
Impact of Supraglacial Lakes on Ice-Shelf Stability |
An automatic weather station was operated on the McMurdo Ice Shelf near Pegasus Air Strip for 365 days from 24 January 2016 to 22 January 2017. The sensors consisted of temperature/RH at 2 m and 8 m (above surface), wind speed at 2 m and 8 m, 4-component radiometer, and wind direction. Time series provides averages for every 30 minutes of a 30 second sample scheme. | ["POINT(166.521 -77.936)"] |
|
CTDP/LADCP profile data along Dotson ice shelf calving front from 2000 to 2016
|
1644159 |
2018-07-12 | Dutrieux, Pierre; Jacobs, Stanley; Jenkins, Adrian; Stammerjohn, Sharon | No project link provided | Collection of CTD and LADCP summer profile observations in front of Dotson ice shelf, West Antarctica, between 2000 and 2016. The data can also be obtained from the various investigators and data centers, including the British Oceanographic Data Centre, the National Oceanographic Data Center, and the Korean Oceanographic Data Center. This dataset is used in the publication by Jenkins and collaborators in Nature Geoscience, 2018, entitled West Antarctic Ice Sheet retreat in the Amundsen Sea driven by decadal oceanic variability. | ["POLYGON((-115 -73.5,-114.5 -73.5,-114 -73.5,-113.5 -73.5,-113 -73.5,-112.5 -73.5,-112 -73.5,-111.5 -73.5,-111 -73.5,-110.5 -73.5,-110 -73.5,-110 -73.6,-110 -73.7,-110 -73.8,-110 -73.9,-110 -74,-110 -74.1,-110 -74.2,-110 -74.3,-110 -74.4,-110 -74.5,-110.5 -74.5,-111 -74.5,-111.5 -74.5,-112 -74.5,-112.5 -74.5,-113 -74.5,-113.5 -74.5,-114 -74.5,-114.5 -74.5,-115 -74.5,-115 -74.4,-115 -74.3,-115 -74.2,-115 -74.1,-115 -74,-115 -73.9,-115 -73.8,-115 -73.7,-115 -73.6,-115 -73.5))"] |
|
Taylor Glacier chemistry data and Taylor Dome TD2015 time scale
|
0839031 1246148 |
2018-06-08 | Severinghaus, Jeffrey P. |
Collaborative Research: A "Horizontal Ice Core" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica |
This dataset contains the chemistry and dust measurements from Taylor Glacier as well as the new Taylor Dome TD2015 time scale described in Baggenstos et al. (2018). | ["POLYGON((161.41425 -77.73489,161.486884 -77.73489,161.559518 -77.73489,161.632152 -77.73489,161.704786 -77.73489,161.77742 -77.73489,161.850054 -77.73489,161.922688 -77.73489,161.995322 -77.73489,162.067956 -77.73489,162.14059 -77.73489,162.14059 -77.747868,162.14059 -77.760846,162.14059 -77.773824,162.14059 -77.786802,162.14059 -77.79978,162.14059 -77.812758,162.14059 -77.825736,162.14059 -77.838714,162.14059 -77.851692,162.14059 -77.86467,162.067956 -77.86467,161.995322 -77.86467,161.922688 -77.86467,161.850054 -77.86467,161.77742 -77.86467,161.704786 -77.86467,161.632152 -77.86467,161.559518 -77.86467,161.486884 -77.86467,161.41425 -77.86467,161.41425 -77.851692,161.41425 -77.838714,161.41425 -77.825736,161.41425 -77.812758,161.41425 -77.79978,161.41425 -77.786802,161.41425 -77.773824,161.41425 -77.760846,161.41425 -77.747868,161.41425 -77.73489))"] |
|
Ground Penetrating Radar Grid Survey of the McMurdo Shear Zone
|
1245915 |
2018-06-07 | Ray, Laura; Arcone, Steven; Kaluzienski, Lynn; Koons, Peter; Lever, Jim; Walker, Ben |
Collaborative Research: Flow and Fracture Dynamics in an Ice Shelf Lateral Margin: Observations and Modeling of the McMurdo Shear Zone |
This dataset is comprised of ground penetrating radar data (GSSI DZT format with DZG files for GPS location) of a 28 square km area conduced in the heavily crevassed McMurdo Shear Zone in two consecutive field seasons. A radar system comprised of a GSSI SIR-30 32-bit two-channel control unit and model 5103 “400 MHz” and Model 5106A “200 MHz” antenna units were used to conduct the GPR surveys. The radar system was mounted on a sled and towed by a robot. The robot surveyed the 5 x 5.7 km area on lines separated by 50-m and traveled from West to East and return. The 2014 survey was conducted between Oct 29, 2014 and Nov 9, 2014, and the 2015 survey was conducted between Oct 26, 2015 and Nov 1, 2015. The use of identical waypoints in each year provides an Eulerian sampling protocol, where sampled GPS locations remain fixed, but the ice moves between annual surveys. In 2014, the 400 MHz antenna imaged to a depth of 19 meters, and in 2015, the 400 MHz antenna imaged to a depth of 80 meters to examine englacial ice. In both years, the 200 MHz antenna imaged to a depth of 160 meters. | ["POLYGON((168.36 -78.03,168.384 -78.03,168.408 -78.03,168.432 -78.03,168.456 -78.03,168.48 -78.03,168.504 -78.03,168.528 -78.03,168.552 -78.03,168.576 -78.03,168.6 -78.03,168.6 -78.035,168.6 -78.04,168.6 -78.045,168.6 -78.05,168.6 -78.055,168.6 -78.06,168.6 -78.065,168.6 -78.07,168.6 -78.075,168.6 -78.08,168.576 -78.08,168.552 -78.08,168.528 -78.08,168.504 -78.08,168.48 -78.08,168.456 -78.08,168.432 -78.08,168.408 -78.08,168.384 -78.08,168.36 -78.08,168.36 -78.075,168.36 -78.07,168.36 -78.065,168.36 -78.06,168.36 -78.055,168.36 -78.05,168.36 -78.045,168.36 -78.04,168.36 -78.035,168.36 -78.03))"] |
|
South Pole area GPS velocities
|
1443471 |
2018-05-29 | Lilien, David; Fudge, T. J.; Koutnik, Michelle; Conway, Howard; Waddington, Edwin D. |
Collaborative Research: Characterization of Upstream Ice and Firn Dynamics affecting the South Pole Ice Core |
These data indicate the positions and velocities of a network of stakes emplaced in the vicinity of South Pole during 2015-2018. They were collected by resurveying emplaced poles over the course of 1-2 years. | ["POLYGON((110 -89,117 -89,124 -89,131 -89,138 -89,145 -89,152 -89,159 -89,166 -89,173 -89,180 -89,180 -89.1,180 -89.2,180 -89.3,180 -89.4,180 -89.5,180 -89.6,180 -89.7,180 -89.8,180 -89.9,180 -90,173 -90,166 -90,159 -90,152 -90,145 -90,138 -90,131 -90,124 -90,117 -90,110 -90,110 -89.9,110 -89.8,110 -89.7,110 -89.6,110 -89.5,110 -89.4,110 -89.3,110 -89.2,110 -89.1,110 -89))"] |
|
Shallow radar near South Pole
|
1443471 |
2018-05-25 | Lilien, David; Fudge, T. J.; Koutnik, Michelle; Conway, Howard; Waddington, Edwin D. |
Collaborative Research: Characterization of Upstream Ice and Firn Dynamics affecting the South Pole Ice Core |
These are 200MHz radar data collected upstream of South Pole during the 2016/17 and 2017/18 field seasons. Data are the raw files produced by the GSSI radar controller, and a set of layer picks. | ["POLYGON((110 -89,117 -89,124 -89,131 -89,138 -89,145 -89,152 -89,159 -89,166 -89,173 -89,180 -89,180 -89.1,180 -89.2,180 -89.3,180 -89.4,180 -89.5,180 -89.6,180 -89.7,180 -89.8,180 -89.9,180 -90,173 -90,166 -90,159 -90,152 -90,145 -90,138 -90,131 -90,124 -90,117 -90,110 -90,110 -89.9,110 -89.8,110 -89.7,110 -89.6,110 -89.5,110 -89.4,110 -89.3,110 -89.2,110 -89.1,110 -89))"] |
|
Ross Sea unconformities digital grids in depth and two-way time
|
1341585 |
2018-05-25 | Sorlien, Christopher; Wilson, Douglas S. |
Subsidence, Tilting, Sedimentation, and Oligocene-middle Miocene paleo-depth of Ross Sea |
This data set includes digital 1 km grids of sub-bottom stratigraphy of most of Ross Sea. In addition to acoustic basement (same as top syn-rift sedimentary rocks in Central Trough and probably other basins), these grids include Oligocene and Miocene horizons that are unconformities in most areas. A sea floor grid is also included. Except for the sea floor grid, the grids are trimmed to be relatively close to control of interpreted seismic stratigraphy. The grids are provided in two way travel time and in depth. Math can be performed on the corresponding time and depth grids to recreate the 3D interval velocity model that was used. The velocity of the water used was 1450 m/s. More detailed descriptions of the work are found in the Final NSF report for PLR1341585 by C. Sorlien, B. Luyendyk, and D. Wilson. The grids are continuous so are merged with the sea floor where there is outcrop, or with basement if there is onlap, or with a young unconformity where there is sub-bottom truncation. The filenames include the name of the horizon (unconformity) and whether they are in time or depth. \"etc.\" means there are two or more horizons that have been merged. Most of the horizons are named and defined in the ANTOSTRAT (1995) atlas. The starting points for many of these horizons are ANTOSTRAT [1995] near DSDP sites 273, 272, and 270. In other areas we deviate from the interpretation of ANTOSTRAT [1995]. late Oligocene through middle Miocene horizons, interpreted very close to the ANTOSTRAT [1995] at DSDP Site 273 in Central Trough, are much deeper in our interpretation within Terror Rift. These horizon grids usually include the sea floor where there is outcrop or acoustic basement (top syn-rift in some basins) where there is onlap. ANTOSTRAT (1995), Seismic Stratigraphic Atlas of the Ross Sea, in Geology and Seismic Stratigraphy of the Antarctic Margin, edited by A. K. Cooper, Barker, P. F., Brancolini, G., 22 plates, American Geophysical Union, Washington, D.C. | ["POLYGON((-180 -73.22,-179.17 -73.22,-178.34 -73.22,-177.51 -73.22,-176.68 -73.22,-175.85 -73.22,-175.02 -73.22,-174.19 -73.22,-173.36 -73.22,-172.53 -73.22,-171.7 -73.22,-171.7 -73.765,-171.7 -74.31,-171.7 -74.855,-171.7 -75.4,-171.7 -75.945,-171.7 -76.49,-171.7 -77.035,-171.7 -77.58,-171.7 -78.125,-171.7 -78.67,-172.53 -78.67,-173.36 -78.67,-174.19 -78.67,-175.02 -78.67,-175.85 -78.67,-176.68 -78.67,-177.51 -78.67,-178.34 -78.67,-179.17 -78.67,180 -78.67,178.56 -78.67,177.12 -78.67,175.68 -78.67,174.24 -78.67,172.8 -78.67,171.36 -78.67,169.92 -78.67,168.48 -78.67,167.04 -78.67,165.6 -78.67,165.6 -78.125,165.6 -77.58,165.6 -77.035,165.6 -76.49,165.6 -75.945,165.6 -75.4,165.6 -74.855,165.6 -74.31,165.6 -73.765,165.6 -73.22,167.04 -73.22,168.48 -73.22,169.92 -73.22,171.36 -73.22,172.8 -73.22,174.24 -73.22,175.68 -73.22,177.12 -73.22,178.56 -73.22,-180 -73.22))"] |
|
2016 Paleomagnetic samples from the James Ross Basin, Antarctica
|
1341729 |
2018-04-27 | Skinner, Steven; Kirschvink, Joseph |
Paleomagnetism and Magnetostratigraphy of the James Ross Basin, Antarctica |
["POLYGON((-58.9 -63.5,-58.63 -63.5,-58.36 -63.5,-58.09 -63.5,-57.82 -63.5,-57.55 -63.5,-57.28 -63.5,-57.01 -63.5,-56.74 -63.5,-56.47 -63.5,-56.2 -63.5,-56.2 -63.62,-56.2 -63.74,-56.2 -63.86,-56.2 -63.98,-56.2 -64.1,-56.2 -64.22,-56.2 -64.34,-56.2 -64.46,-56.2 -64.58,-56.2 -64.7,-56.47 -64.7,-56.74 -64.7,-57.01 -64.7,-57.28 -64.7,-57.55 -64.7,-57.82 -64.7,-58.09 -64.7,-58.36 -64.7,-58.63 -64.7,-58.9 -64.7,-58.9 -64.58,-58.9 -64.46,-58.9 -64.34,-58.9 -64.22,-58.9 -64.1,-58.9 -63.98,-58.9 -63.86,-58.9 -63.74,-58.9 -63.62,-58.9 -63.5))"] | |
|
Satellite tracks of Black-browed Albatross in the Southern Indian Ocean
|
1142084 |
2018-04-11 | Losekoot, Marcel; Nevitt, Gabrielle |
Applying High-resolution GPS Tracking to Characterize Sensory Foraging Strategies of the Black-browed Albatross, a Top Predator of the Southern Ocean Ecosystem |
This dataset was recorded from tags fitted to Black-browed Albatross from the breeding colony called "Canon des Sourcils Noirs", on Kerguelen Island, located at 70.2433E, -49.6875S. The dataset contains the following items: 1. GPS locations (lat,lon) and timestamps at local time (GMT-5) 2. Timestamped stomach temperature measurements. | ["POLYGON((40 -25,46 -25,52 -25,58 -25,64 -25,70 -25,76 -25,82 -25,88 -25,94 -25,100 -25,100 -29,100 -33,100 -37,100 -41,100 -45,100 -49,100 -53,100 -57,100 -61,100 -65,94 -65,88 -65,82 -65,76 -65,70 -65,64 -65,58 -65,52 -65,46 -65,40 -65,40 -61,40 -57,40 -53,40 -49,40 -45,40 -41,40 -37,40 -33,40 -29,40 -25))"] |
|
South Pole Ice Core (SPIcecore) Visual Observations
|
1542778 |
2018-03-05 | Fegyveresi, John; Alley, Richard |
Climate History and Flow Processes from Physical Analyses of the SPICECORE South Pole Ice Core |
This dataset includes all visible observations made of the South Pole Ice core within a dark booth during core processing at the National Ice Core Laboratory. This dataset includes observations starting at 735 meters depth, down to the bottom of the drilled core at 1751 meters. All visible and cloudy layers are noted, as well as any other observed feature or cracks. In addition, all Volcanic layers measured on the ECM were noted. | ["POLYGON((-180 -89.9,-144 -89.9,-108 -89.9,-72 -89.9,-36 -89.9,0 -89.9,36 -89.9,72 -89.9,108 -89.9,144 -89.9,180 -89.9,180 -89.91,180 -89.92,180 -89.93,180 -89.94,180 -89.95,180 -89.96,180 -89.97,180 -89.98,180 -89.99,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -89.99,-180 -89.98,-180 -89.97,-180 -89.96,-180 -89.95,-180 -89.94,-180 -89.93,-180 -89.92,-180 -89.91,-180 -89.9))"] |
|
WAIS Divide 580m Bubble and Grain Hybrid Data
|
0539578 |
2018-03-01 | Fegyveresi, John; Alley, Richard |
Collaborative Research: Continued Study of Physical Properties of the WAIS Divide Deep Core |
This dataset contains detailed grain and bubble properties data for a new hybrid analysis study relating bubble elongation to crystal orientations. All data are from a depth of 580 meters in a sample from the WAIS Divide ice core. | ["POINT(-112.085 -79.467)"] |
|
Weather data from LARISSA / SCAR Inlet Rapid AMIGOS and cGPS stations
|
1565576 |
2018-02-13 | Scambos, Ted |
RAPID: Observing the Disintegration of the Scar Inlet Ice Shelf |
Weather and instrument data from the Automated Meterology Ice Geophysics Observation System (AMIGOS) stations installed as part of the LARISSA and RAPID Scar Inlet funded grants from NSF-PLR. The data include temperature, wind, pressure, humidity, station position (coarse), and station health. | ["POLYGON((-63 -64.75,-62.6 -64.75,-62.2 -64.75,-61.8 -64.75,-61.4 -64.75,-61 -64.75,-60.6 -64.75,-60.2 -64.75,-59.8 -64.75,-59.4 -64.75,-59 -64.75,-59 -64.9,-59 -65.05,-59 -65.2,-59 -65.35,-59 -65.5,-59 -65.65,-59 -65.8,-59 -65.95,-59 -66.1,-59 -66.25,-59.4 -66.25,-59.8 -66.25,-60.2 -66.25,-60.6 -66.25,-61 -66.25,-61.4 -66.25,-61.8 -66.25,-62.2 -66.25,-62.6 -66.25,-63 -66.25,-63 -66.1,-63 -65.95,-63 -65.8,-63 -65.65,-63 -65.5,-63 -65.35,-63 -65.2,-63 -65.05,-63 -64.9,-63 -64.75))"] |
|
Roosevelt Island Borehole Firn temperatures
|
0943466 |
2018-02-13 | Hawley, Robert L.; Clemens-Sewall, David; Giese, Alexandra |
Collaborative Research: Deglaciation of the Ross Sea Embayment - constraints from Roosevelt Island |
These data are firn temperatures, measured by a meteorological station placed at Roosevelt Island. Thermistors were placed at multiple depths through the upper 20 meters of firn and measured through the course of roughly one year. | ["POLYGON((-163 -79,-162.8 -79,-162.6 -79,-162.4 -79,-162.2 -79,-162 -79,-161.8 -79,-161.6 -79,-161.4 -79,-161.2 -79,-161 -79,-161 -79.05,-161 -79.1,-161 -79.15,-161 -79.2,-161 -79.25,-161 -79.3,-161 -79.35,-161 -79.4,-161 -79.45,-161 -79.5,-161.2 -79.5,-161.4 -79.5,-161.6 -79.5,-161.8 -79.5,-162 -79.5,-162.2 -79.5,-162.4 -79.5,-162.6 -79.5,-162.8 -79.5,-163 -79.5,-163 -79.45,-163 -79.4,-163 -79.35,-163 -79.3,-163 -79.25,-163 -79.2,-163 -79.15,-163 -79.1,-163 -79.05,-163 -79))"] |
|
Roosevelt Island Borehole Optical Televiewer logs
|
0943466 |
2018-02-13 | Hawley, Robert L.; Clemens-Sewall, David |
Collaborative Research: Deglaciation of the Ross Sea Embayment - constraints from Roosevelt Island |
A Borehole Optical Televiewer (OPTV) uses a conical mirror and scanning electronics to record a continuous 360-degree image of the borehole wall. An inclinometer and magnetometer allow the image to be 'unwrapped' and resented as a rectangular image, which shows the visible features of the wall oriented to magnetic north. This dataset includes both the raw bitmap (bmp) image data from the televiewer, as well as proprietary WellCad format (wcl) files. The WellCad format files contain the inclinometry, orientation, and temperature data in addition to the imagery data. Wellcad files can be viewed with a free wellcad file reader available from https://www.alt.lu/downloads.htm. This dataset includes OPTV logs from each of two seasons, November 2013 and 2014. The logs are of the 760 m deep hole drilled by the RICE project, a NZ-USA partnership. | ["POLYGON((-163 -79,-162.8 -79,-162.6 -79,-162.4 -79,-162.2 -79,-162 -79,-161.8 -79,-161.6 -79,-161.4 -79,-161.2 -79,-161 -79,-161 -79.05,-161 -79.1,-161 -79.15,-161 -79.2,-161 -79.25,-161 -79.3,-161 -79.35,-161 -79.4,-161 -79.45,-161 -79.5,-161.2 -79.5,-161.4 -79.5,-161.6 -79.5,-161.8 -79.5,-162 -79.5,-162.2 -79.5,-162.4 -79.5,-162.6 -79.5,-162.8 -79.5,-163 -79.5,-163 -79.45,-163 -79.4,-163 -79.35,-163 -79.3,-163 -79.25,-163 -79.2,-163 -79.15,-163 -79.1,-163 -79.05,-163 -79))"] |
|
NBP1502A Cruise Core Data
|
1246353 |
2018-02-05 | Simkins, Lauren; Anderson, John; Prothro, Lindsay |
Evidence for Paleo Ice Stream Collapse in the Western Ross Sea since the Last Glacial Maximum. |
Dataset includes details of cores collected as part of cruise NBP1502A, a list of radiocarbon-dated samples and samples to be radiocarbon-dated, and grain-size data from select NBP1502A cores. | ["POLYGON((-180 -74.37,-178.85 -74.37,-177.7 -74.37,-176.55 -74.37,-175.4 -74.37,-174.25 -74.37,-173.1 -74.37,-171.95 -74.37,-170.8 -74.37,-169.65 -74.37,-168.5 -74.37,-168.5 -74.747,-168.5 -75.124,-168.5 -75.501,-168.5 -75.878,-168.5 -76.255,-168.5 -76.632,-168.5 -77.009,-168.5 -77.386,-168.5 -77.763,-168.5 -78.14,-169.65 -78.14,-170.8 -78.14,-171.95 -78.14,-173.1 -78.14,-174.25 -78.14,-175.4 -78.14,-176.55 -78.14,-177.7 -78.14,-178.85 -78.14,180 -78.14,178.48 -78.14,176.96 -78.14,175.44 -78.14,173.92 -78.14,172.4 -78.14,170.88 -78.14,169.36 -78.14,167.84 -78.14,166.32 -78.14,164.8 -78.14,164.8 -77.763,164.8 -77.386,164.8 -77.009,164.8 -76.632,164.8 -76.255,164.8 -75.878,164.8 -75.501,164.8 -75.124,164.8 -74.747,164.8 -74.37,166.32 -74.37,167.84 -74.37,169.36 -74.37,170.88 -74.37,172.4 -74.37,173.92 -74.37,175.44 -74.37,176.96 -74.37,178.48 -74.37,-180 -74.37))"] |
|
WAIS Divide Surface and Snow-pit Data, 2009-2013
|
1043528 |
2018-01-16 | Fegyveresi, John; Alley, Richard |
Collaborative Research: Continued Study of Physical Properties of the WAIS Divide Deep Core Collaborative Research: Physical Properties of the WAIS Divide Deep Core |
This dataset includes all surface, snowpit, crust, AWS, and near-surface thermistor data used for analyses and publication "Surface formation, preservation, and history of low-porosity crusts at the WAIS Divide site, West Antarctica" DOI: https://doi.org/10.5194/tc-12-1-2018 | ["POINT(-112.085 -79.467)"] |
|
Region Climate Model Output Plio-Pleistocene
|
1245899 |
2018-01-16 | Kowalewski, Douglas |
Collaborative Research: West Antarctic Ice Sheet stability, Alpine Glaciation, and Climate Variability: a Terrestrial Perspective from Cosmogenic-nuclide Dating in McMurdo Sound |
Data here is output from regional climate modeling to shed light on the range of possible environmental conditions in the McMurdo region during periods of grounded ice expansion and recession during the Plio-Pleistocene. | ["POLYGON((160 -70,168 -70,176 -70,184 -70,192 -70,200 -70,208 -70,216 -70,224 -70,232 -70,240 -70,240 -71.5,240 -73,240 -74.5,240 -76,240 -77.5,240 -79,240 -80.5,240 -82,240 -83.5,240 -85,232 -85,224 -85,216 -85,208 -85,200 -85,192 -85,184 -85,176 -85,168 -85,160 -85,160 -83.5,160 -82,160 -80.5,160 -79,160 -77.5,160 -76,160 -74.5,160 -73,160 -71.5,160 -70))"] |
|
Scar Inlet Terrestrial Radar Interferometry
|
1565576 |
2017-12-20 | Truffer, Martin |
RAPID: Observing the Disintegration of the Scar Inlet Ice Shelf |
A terrestrial radar interferometer was set up at a location overlooking a remnant of the Larsen B iceshelf and the adjacent fast ice. Images were acquired every 4 minutes with a Gamma Portable Radar Interferometer - 2. Data include images from two antennas, to allow the generation of interferometric DEMs, as well as line-of-sight displacement fields between consecutive images. The archived data are single-look complex (SLC) images, together with parameter files. | ["POLYGON((-62.2 -65.5,-62.12 -65.5,-62.04 -65.5,-61.96 -65.5,-61.88 -65.5,-61.8 -65.5,-61.72 -65.5,-61.64 -65.5,-61.56 -65.5,-61.48 -65.5,-61.4 -65.5,-61.4 -65.53,-61.4 -65.56,-61.4 -65.59,-61.4 -65.62,-61.4 -65.65,-61.4 -65.68,-61.4 -65.71,-61.4 -65.74,-61.4 -65.77,-61.4 -65.8,-61.48 -65.8,-61.56 -65.8,-61.64 -65.8,-61.72 -65.8,-61.8 -65.8,-61.88 -65.8,-61.96 -65.8,-62.04 -65.8,-62.12 -65.8,-62.2 -65.8,-62.2 -65.77,-62.2 -65.74,-62.2 -65.71,-62.2 -65.68,-62.2 -65.65,-62.2 -65.62,-62.2 -65.59,-62.2 -65.56,-62.2 -65.53,-62.2 -65.5))"] |
|
Respiration Metadata
|
1141978 |
2017-12-19 | Foreman, Christine; Smith, Heidi |
Multidimensional "omics" characterization of microbial metabolism and dissolved organic matter in Antarctica |
Metadata presented include high resolution respiration data from Janthinobacterium sp. CG3 for three dissolved organic matter samples Cotton Glacier Supraglacial stream, Pony Lake fulvic acid, and Suwannee River Natural Organic Matter (NOM). | ["POINT(161.667 -77.117)"] |
|
FT-ICR MS Metadata
|
1141978 |
2017-12-19 | Foreman, Christine; DAndrilli, Juliana |
Multidimensional "omics" characterization of microbial metabolism and dissolved organic matter in Antarctica |
Metadata presented include Fourier transform ion cyclotron resonance mass spectrometry characterization of carbon source material molecular composition for three isolated lyophilized OM samples: Cotton Glacier Supraglacial stream, IHSS Pony Lake, and IHSS Suwannee River | ["POINT(161.667 -77.117)"] |
|
Active Layer Temperatures from Crescent Stream banks, Taylor Valley Antarctica
|
1246203 |
2017-12-18 | Gooseff, Michael N. |
Collaborative Research: THE MCMURDO DRY VALLEYS: A landscape on the Threshold of Change |
As a part of the project titled "Collaborative Research: The McMurdo Dry Valleys: A landscape on the threshold of change", we measured ground temperatures from 0-20cm at three stream bank positions (base, mid-slope, and top) at 4 locations along Crescent Stream in Taylor Valley - 2 on the east bank, 2 on the west bank. The goal was to evaluate differences in thermal conduction and temperature dynamics of the active layers of these locations, in particular, in a stream that has undergone extensive bank erosion since 2012 due to permafrost degradation. One of the datalogging stations had significant technical problems and has very little data compared to the almost 2 years of temperature date from the other 3 stations (2015-2017). | ["POLYGON((163.1778 -77.6233,163.17792 -77.6233,163.17804 -77.6233,163.17816 -77.6233,163.17828 -77.6233,163.1784 -77.6233,163.17852 -77.6233,163.17864 -77.6233,163.17876 -77.6233,163.17888 -77.6233,163.179 -77.6233,163.179 -77.63331,163.179 -77.64332,163.179 -77.65333,163.179 -77.66334,163.179 -77.67335,163.179 -77.68336,163.179 -77.69337,163.179 -77.70338,163.179 -77.71339,163.179 -77.7234,163.17888 -77.7234,163.17876 -77.7234,163.17864 -77.7234,163.17852 -77.7234,163.1784 -77.7234,163.17828 -77.7234,163.17816 -77.7234,163.17804 -77.7234,163.17792 -77.7234,163.1778 -77.7234,163.1778 -77.71339,163.1778 -77.70338,163.1778 -77.69337,163.1778 -77.68336,163.1778 -77.67335,163.1778 -77.66334,163.1778 -77.65333,163.1778 -77.64332,163.1778 -77.63331,163.1778 -77.6233))"] |
|
LARISSA: Impact of ice-shelf loss on geochemical profiles and microbial community composition in marine sediments of the Larsen A embayment, Antarctic Peninsula
|
0732917 |
2017-12-17 | McCormick, Michael |
Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach - Marine Ecosystems. |
Ice-shelf loss along the east coast of the Antarctic Peninsula over recent decades has brought new sources of carbon and energy to the marine benthos likely affecting sediment geochemistry and microbial community composition. To better understand the long-term effects of ice-shelf loss on benthic microbial communities, we conducted a five-station survey along a 160 km transect following the historic path of retreat of the Larsen A ice shelf. All microbial community sequence data is publicly available through the Metagenomics Analysis Server at Argonne National Laboratory (MG-RAST). The project title is "Impact of ice-shelf loss on geochemical profiles and microbial community composition in marine sediments of the Larsen A embayment, Antarctic Peninsula". A key word search using terms from this title at the MG-RAST portal (http://metagenomics.anl.gov/) will return the complete sample list. This submitted dataset summarizes the measured environmental parameters for these same samples (lat., long., water depth, sediment depth, pH, alkalinity, dissolved oxygen, silicate, phosphate, nitrate, nitrite, and ammonium). | ["POLYGON((299.4 -63.1,299.92 -63.1,300.44 -63.1,300.96 -63.1,301.48 -63.1,302 -63.1,302.52 -63.1,303.04 -63.1,303.56 -63.1,304.08 -63.1,304.6 -63.1,304.6 -63.29,304.6 -63.48,304.6 -63.67,304.6 -63.86,304.6 -64.05,304.6 -64.24,304.6 -64.43,304.6 -64.62,304.6 -64.81,304.6 -65,304.08 -65,303.56 -65,303.04 -65,302.52 -65,302 -65,301.48 -65,300.96 -65,300.44 -65,299.92 -65,299.4 -65,299.4 -64.81,299.4 -64.62,299.4 -64.43,299.4 -64.24,299.4 -64.05,299.4 -63.86,299.4 -63.67,299.4 -63.48,299.4 -63.29,299.4 -63.1))"] |
|
Prokaryotic cell concentration record from the WAIS Divide ice core
|
0839075 |
2017-12-12 | Santibanez, Pamela; Priscu, John |
Collaborative Research: Integrated High Resolution Chemical and Biological Measurements on the Deep WAIS Divide Core |
This data set includes raw concentration of prokaryotic cells for the WAIS Divide deep core, WDC06A, from 1,764 m to 2,709 m. Data were collected by a method that combines acquisition of discrete samples using a continuous ice-core melting system (McConnell et al., 2002) coupled with flow cytometry of DNA-stained samples. The method is described in detail in Santibanez et al., 2016. We present the first long-term, highly resolved prokaryotic cell concentration record obtained from a polar ice core. This record, obtained from the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core, spanned from the Last Glacial Maximum (LGM) to the early Holocene (EH) and showed distinct fluctuations in prokaryotic cell concentration coincident with major climatic states. This record provided strong evidence that airborne prokaryotic cell deposition differed during the LGM, LDG and EH, and that these changes in cell densities could be explained by different environmental conditions during each of these climatic periods. Our observations provide the first ice core time-series evidence for a prokaryotic response to long-term climatic and environmental processes. | ["POINT(-112 -79)"] |
|
Shortwave Spectroradiometer Data from Ross Island, Antarctica
|
1141939 |
2017-12-12 | Lubin, Dan |
Antarctic Cloud Physics: Fundamental Observations from Ross Island |
In this project we made fundamental measurements of cloud optical and microphysical properties at Ross Island, Antarctica, using a versatile shortwave spectroradiometer (Panalytical, Inc.) acquired for atmospheric field research by the Scripps Institution of Oceanography (SIO). This instrument measures downwelling spectral irradiance at the Earth surface in the wavelength interval 350-2200 nm. From this data set one can retrieve properties of coastal Antarctic stratiform clouds including optical depth, thermodynamic phase, liquid water droplet effective radius, and ice cloud effective particle size. The instrument was installed at Arrival Heights, and measurements were made from 10 October 2012 to 4 February 2013. Spectral data recorded in one-minute averages, with some gaps for instrument maintenance and data backup, and some occasional down time when the site was inaccessible. Active satellite remote sensing data (CloudSat and CALIPSO) were used for validation and interpretation of the spectroradiometer retrievals (Scott and Lubin 2014). <br><br>There are two reasons why this measurement program remains timely. One straightforward reason involves the location of McMurdo Station, which is the US Antarctic Programs air transport entry point to the continent. Improvements in our knowledge of atmospheric physics in this region can eventually lead to improvements in numerical weather forecasting relevant to aviation. A second reason involves the recent advances in cloud microphysics for global climate model simulation. Mixed-phase cloud parameterizations have become very sophisticated, requiring validation with each new improvement. Traditional observational test cases - from the Arctic or mid-latitude storm systems - are often quite complex. A coastal Antarctic site at very high latitudes can provide more straightforward cases for testing current microphysical parameterizations. Over Ross Island aerosol and cloud nucleation sources are essentially all natural and oceanic, and cloud geometry is simple, while at the same time there is abundant supercooled cloud liquid water. <br><br>Ancillary meteorological data from the McMurdo Weather Office are also included here for help in interpreting the spectroradiometer data, including rawinsonde profiles, surface weather observations from the active ice runway, and automated FMQ19 surface weather measurements from Williams Field and Pegasus runway. For interpretation of clear sky or nearly cloud-free irradiance spectra (i.e., when a large fraction of the irradiance is directional from the Sun and not diffused by clouds), we recommend consulting Meywerk and Ramanathan (1999) for information about the Panalytical instruments cosine response. | ["POLYGON((166.31 -77.5203,166.38265 -77.5203,166.4553 -77.5203,166.52795 -77.5203,166.6006 -77.5203,166.67325 -77.5203,166.7459 -77.5203,166.81855 -77.5203,166.8912 -77.5203,166.96385 -77.5203,167.0365 -77.5203,167.0365 -77.52527,167.0365 -77.53024,167.0365 -77.53521,167.0365 -77.54018,167.0365 -77.54515,167.0365 -77.55012,167.0365 -77.55509,167.0365 -77.56006,167.0365 -77.56503,167.0365 -77.57,166.96385 -77.57,166.8912 -77.57,166.81855 -77.57,166.7459 -77.57,166.67325 -77.57,166.6006 -77.57,166.52795 -77.57,166.4553 -77.57,166.38265 -77.57,166.31 -77.57,166.31 -77.56503,166.31 -77.56006,166.31 -77.55509,166.31 -77.55012,166.31 -77.54515,166.31 -77.54018,166.31 -77.53521,166.31 -77.53024,166.31 -77.52527,166.31 -77.5203))"] |
|
2011 Time-domain ElectroMagnetics data for McMurdo Dry Valleys
|
1344349 |
2017-12-05 | Tulaczyk, Slawek |
Collaborative Research: EAGER: Processing, Interpretation and Dissemination of the Proof-of-Concept Transient Electromagnetic Survey of the McMurdo Dry Valleys Region |
This dataset contains raw TEM data and inverted electrical resistivity data. The raw data were collected using a helicopter-borne sensor in November/December 2011 in collaboration with Drs. Esben Auken (University of Aarhus), Jill Mikucki (University of Tennessee - Knoxville) and Ross Virginia (Dartmouth College). Details on data collection and processing are provided in Mikucki et al. (2015) and Foley et al. (2015). We request that these two references be cited in any future publications based on the archived dataset. | ["POLYGON((161.6 -77.4,162.14 -77.4,162.68 -77.4,163.22 -77.4,163.76 -77.4,164.3 -77.4,164.84 -77.4,165.38 -77.4,165.92 -77.4,166.46 -77.4,167 -77.4,167 -77.437,167 -77.474,167 -77.511,167 -77.548,167 -77.585,167 -77.622,167 -77.659,167 -77.696,167 -77.733,167 -77.77,166.46 -77.77,165.92 -77.77,165.38 -77.77,164.84 -77.77,164.3 -77.77,163.76 -77.77,163.22 -77.77,162.68 -77.77,162.14 -77.77,161.6 -77.77,161.6 -77.733,161.6 -77.696,161.6 -77.659,161.6 -77.622,161.6 -77.585,161.6 -77.548,161.6 -77.511,161.6 -77.474,161.6 -77.437,161.6 -77.4))"] |
|
Roosevelt Island: Radar and GPS
|
0944307 |
2017-11-16 | Conway, Howard |
Collaborative Research: Deglaciation of the Ross Sea Embayment - constraints from Roosevelt Island |
Ground-based radar data include radar echograms and .mat files of internal stratigraphy. Also included are picks of ice thickness and surface elevation. <br> GPS data include positions of 142 poles set in 2010 and resurveyed in 2012. Also given are velocity vectors for the poles. | ["POLYGON((-162.83 -79.15,-162.637 -79.15,-162.444 -79.15,-162.251 -79.15,-162.058 -79.15,-161.865 -79.15,-161.672 -79.15,-161.479 -79.15,-161.286 -79.15,-161.093 -79.15,-160.9 -79.15,-160.9 -79.1885037,-160.9 -79.2270074,-160.9 -79.2655111,-160.9 -79.3040148,-160.9 -79.3425185,-160.9 -79.3810222,-160.9 -79.4195259,-160.9 -79.4580296,-160.9 -79.4965333,-160.9 -79.535037,-161.093 -79.535037,-161.286 -79.535037,-161.479 -79.535037,-161.672 -79.535037,-161.865 -79.535037,-162.058 -79.535037,-162.251 -79.535037,-162.444 -79.535037,-162.637 -79.535037,-162.83 -79.535037,-162.83 -79.4965333,-162.83 -79.4580296,-162.83 -79.4195259,-162.83 -79.3810222,-162.83 -79.3425185,-162.83 -79.3040148,-162.83 -79.2655111,-162.83 -79.2270074,-162.83 -79.1885037,-162.83 -79.15))"] |
|
Sabrina Coast mooring data - sediment trap mooring 2014
|
1143834 |
2017-11-15 | Huber, Bruce |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
Time series of temperature and salinity from a sediment trap mooring deployed during NBP1402 on 04 March 2014 at 66S 11, 122 E 30.2, depth 547 m. The mooring was recovered from Aurora Australis on 26 December 2014 | ["POINT(120.5 -66.2)"] |
|
NBP1402 Lowered ADCP data
|
1143834 |
2017-11-15 | Huber, Bruce |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
Lowered Acoustic Doppler Current Profiler (LADCP) data collected concurrently with 15 CTD profiles during NBP1402. The LADCP acquires profiles of water current, expressed as U and V components (E-W and N-S). | ["POLYGON((117 -66,119.9 -66,122.8 -66,125.7 -66,128.6 -66,131.5 -66,134.4 -66,137.3 -66,140.2 -66,143.1 -66,146 -66,146 -66.1,146 -66.2,146 -66.3,146 -66.4,146 -66.5,146 -66.6,146 -66.7,146 -66.8,146 -66.9,146 -67,143.1 -67,140.2 -67,137.3 -67,134.4 -67,131.5 -67,128.6 -67,125.7 -67,122.8 -67,119.9 -67,117 -67,117 -66.9,117 -66.8,117 -66.7,117 -66.6,117 -66.5,117 -66.4,117 -66.3,117 -66.2,117 -66.1,117 -66))"] |
|
NBP1402 Final CTD data
|
1143834 |
2017-11-10 | Huber, Bruce |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
Conductivity, Temperature, Depth (CTD) profiles from NBP1402, final, calibrated version. Data are reported as an ascii table suitable for import to Ocean Data View. | ["POLYGON((117 -66,119.9 -66,122.8 -66,125.7 -66,128.6 -66,131.5 -66,134.4 -66,137.3 -66,140.2 -66,143.1 -66,146 -66,146 -66.1,146 -66.2,146 -66.3,146 -66.4,146 -66.5,146 -66.6,146 -66.7,146 -66.8,146 -66.9,146 -67,143.1 -67,140.2 -67,137.3 -67,134.4 -67,131.5 -67,128.6 -67,125.7 -67,122.8 -67,119.9 -67,117 -67,117 -66.9,117 -66.8,117 -66.7,117 -66.6,117 -66.5,117 -66.4,117 -66.3,117 -66.2,117 -66.1,117 -66))"] |
|
Images of Fossil Plants of Antarctica
|
1341500 |
2017-11-07 | Ryberg, Patricia |
RUI: Antarctic Paleobotany: Permian Floral Characteristics in a Sedimentary Setting |
Images of Late Permian glossopterid reproductive structures from Allan Hills in the Beardmore Glacier Region of Antarctica. | [] |
|
List of samples of WAIS Divide and Byrd (deep) ice that were analyzed for radiogenic isotopes at LDEO
|
1043471 |
2017-10-27 | Kaplan, Michael |
A Study of Atmospheric Dust in the WAIS Divide Ice Core Based on Sr-Nd-Pb-He Isotopes |
Listed are samples of WAIS Divide and Byrd (deep) ice that were analyzed for radiogenic isotopes at LDEO. | ["POLYGON((-112.5 -79.468,-112.4586 -79.468,-112.4172 -79.468,-112.3758 -79.468,-112.3344 -79.468,-112.293 -79.468,-112.2516 -79.468,-112.2102 -79.468,-112.1688 -79.468,-112.1274 -79.468,-112.086 -79.468,-112.086 -79.4712,-112.086 -79.4744,-112.086 -79.4776,-112.086 -79.4808,-112.086 -79.484,-112.086 -79.4872,-112.086 -79.4904,-112.086 -79.4936,-112.086 -79.4968,-112.086 -79.5,-112.1274 -79.5,-112.1688 -79.5,-112.2102 -79.5,-112.2516 -79.5,-112.293 -79.5,-112.3344 -79.5,-112.3758 -79.5,-112.4172 -79.5,-112.4586 -79.5,-112.5 -79.5,-112.5 -79.4968,-112.5 -79.4936,-112.5 -79.4904,-112.5 -79.4872,-112.5 -79.484,-112.5 -79.4808,-112.5 -79.4776,-112.5 -79.4744,-112.5 -79.4712,-112.5 -79.468))"] |
|
Anvers Trough Foraminifer Stable Isotope data
|
1246378 |
2017-10-25 | Shevenell, Amelia |
Late Quaternary Evolution of the Lambert Glacier/Amery Ice Shelf System, Prydz Bay, Antarctica |
These are unpublished stable isotope data from a series of sediment cores collected during LMG12-11 and LMG13-11 down the axis of Anvers Trough. These records span the LMG to recent. | ["POLYGON((-65.32 -64.15,-65.309 -64.15,-65.298 -64.15,-65.287 -64.15,-65.276 -64.15,-65.265 -64.15,-65.254 -64.15,-65.243 -64.15,-65.232 -64.15,-65.221 -64.15,-65.21 -64.15,-65.21 -64.186,-65.21 -64.222,-65.21 -64.258,-65.21 -64.294,-65.21 -64.33,-65.21 -64.366,-65.21 -64.402,-65.21 -64.438,-65.21 -64.474,-65.21 -64.51,-65.221 -64.51,-65.232 -64.51,-65.243 -64.51,-65.254 -64.51,-65.265 -64.51,-65.276 -64.51,-65.287 -64.51,-65.298 -64.51,-65.309 -64.51,-65.32 -64.51,-65.32 -64.474,-65.32 -64.438,-65.32 -64.402,-65.32 -64.366,-65.32 -64.33,-65.32 -64.294,-65.32 -64.258,-65.32 -64.222,-65.32 -64.186,-65.32 -64.15))"] |
|
Hatherton Glacier Radiocarbon Data
|
1246170 |
2017-10-23 | Hall, Brenda |
Collaborative Research: Assessing the Antarctic Contribution to Sea-level Changes during the Last Deglaciation: Constraints from Darwin Glacier |
Hatherton Glacier Radiocarbon Data | ["POLYGON((155.4 -79.8,155.54 -79.8,155.68 -79.8,155.82 -79.8,155.96 -79.8,156.1 -79.8,156.24 -79.8,156.38 -79.8,156.52 -79.8,156.66 -79.8,156.8 -79.8,156.8 -79.82,156.8 -79.84,156.8 -79.86,156.8 -79.88,156.8 -79.9,156.8 -79.92,156.8 -79.94,156.8 -79.96,156.8 -79.98,156.8 -80,156.66 -80,156.52 -80,156.38 -80,156.24 -80,156.1 -80,155.96 -80,155.82 -80,155.68 -80,155.54 -80,155.4 -80,155.4 -79.98,155.4 -79.96,155.4 -79.94,155.4 -79.92,155.4 -79.9,155.4 -79.88,155.4 -79.86,155.4 -79.84,155.4 -79.82,155.4 -79.8))"] |
|
Data from Schram et al. 2017 MEPS
|
1041022 |
2017-10-20 | Amsler, Charles; Schram, Julie |
The effects of ocean acidification and rising sea surface temperatures on shallow-water benthic organisms in Antarctica |
["POLYGON((-64.5 -64.5,-64.45 -64.5,-64.4 -64.5,-64.35 -64.5,-64.3 -64.5,-64.25 -64.5,-64.2 -64.5,-64.15 -64.5,-64.1 -64.5,-64.05 -64.5,-64 -64.5,-64 -64.54,-64 -64.58,-64 -64.62,-64 -64.66,-64 -64.7,-64 -64.74,-64 -64.78,-64 -64.82,-64 -64.86,-64 -64.9,-64.05 -64.9,-64.1 -64.9,-64.15 -64.9,-64.2 -64.9,-64.25 -64.9,-64.3 -64.9,-64.35 -64.9,-64.4 -64.9,-64.45 -64.9,-64.5 -64.9,-64.5 -64.86,-64.5 -64.82,-64.5 -64.78,-64.5 -64.74,-64.5 -64.7,-64.5 -64.66,-64.5 -64.62,-64.5 -64.58,-64.5 -64.54,-64.5 -64.5))"] | |
|
Long-term rock abrasion study in the Dry Valleys
|
1341712 1341754 |
2017-10-11 | Sletten, Ronald S.; Hallet, Bernard; Malin, Michael |
Collaborative Proposal: Decades-long Experiment on Wind-Driven Rock Abrasion in the Ice-Free Valleys, Antarctica |
Abrasion mass loss for rock targets installed in the Dry Valleys starting in 1982. | ["POLYGON((160.9 -76.7,161.08 -76.7,161.26 -76.7,161.44 -76.7,161.62 -76.7,161.8 -76.7,161.98 -76.7,162.16 -76.7,162.34 -76.7,162.52 -76.7,162.7 -76.7,162.7 -76.79,162.7 -76.88,162.7 -76.97,162.7 -77.06,162.7 -77.15,162.7 -77.24,162.7 -77.33,162.7 -77.42,162.7 -77.51,162.7 -77.6,162.52 -77.6,162.34 -77.6,162.16 -77.6,161.98 -77.6,161.8 -77.6,161.62 -77.6,161.44 -77.6,161.26 -77.6,161.08 -77.6,160.9 -77.6,160.9 -77.51,160.9 -77.42,160.9 -77.33,160.9 -77.24,160.9 -77.15,160.9 -77.06,160.9 -76.97,160.9 -76.88,160.9 -76.79,160.9 -76.7))"] |
|
c-Axis Fabric of the South Pole Ice Core, SPC14
|
1542778 |
2017-09-20 | Voigt, Donald E. |
Climate History and Flow Processes from Physical Analyses of the SPICECORE South Pole Ice Core |
Thin sections of the South Pole Ice Core, SPC14, were prepared from samples taken every ~20 meters starting at 100 meters depth. Samples from 140 meters to 1739 meters depth were analyzed to determine the c-axis fabric of the grains. The ice is generally fine-grained, with the samples at 100 and 120 meters depth too fine grained for successful analysis, but sufficient grain growth having occurred for analysis of all deeper samples. The c-axis fabric was measured on the automated c-axis fabric analyzer located at Penn State University, designed and built by Larry Wilen. Raw data is in the form of multiple images of the ice thin section taken at defined angles under cross polarized light. The images are analyzed to determine position of the extinction minimum of each grain within the thin section, this being the orientation of the c-axis of that grain. During processing, the area of each analyzed grain is also measured. Shallow samples show a fairly random distribution, although with a slight tendency for clustering of c-axes toward the vertical. With increasing depth, the c-axes rotate toward a vertical plane with a slight additional tendency of clustering toward the vertical within that plane. The core was not oriented during collection, so it is not possible to unambiguously tell how the vertical plane is related to ice flow, but physical understanding indicates that it is transverse to flow. | ["POINT(-180 -90)"] |
|
10Be and 14C data from northern Antarctic Peninsula
|
1142002 |
2017-09-16 | Kaplan, Michael |
Terrestrial Geological Context for Glacier Change in the Northeast Antarctica Peninsula |
These are data sets obtained with the supported award. The ages concern the histories of glaciers, ice sheets, and general cryospheric and climatic activities of the northern Antarctic Peninsula and surrounding area.They cover periods from prior to the last global glacial maximum (stage 3 and older?) as well as since deglaciation. | ["POLYGON((-58 -63.7,-57.95 -63.7,-57.9 -63.7,-57.85 -63.7,-57.8 -63.7,-57.75 -63.7,-57.7 -63.7,-57.65 -63.7,-57.6 -63.7,-57.55 -63.7,-57.5 -63.7,-57.5 -63.73,-57.5 -63.76,-57.5 -63.79,-57.5 -63.82,-57.5 -63.85,-57.5 -63.88,-57.5 -63.91,-57.5 -63.94,-57.5 -63.97,-57.5 -64,-57.55 -64,-57.6 -64,-57.65 -64,-57.7 -64,-57.75 -64,-57.8 -64,-57.85 -64,-57.9 -64,-57.95 -64,-58 -64,-58 -63.97,-58 -63.94,-58 -63.91,-58 -63.88,-58 -63.85,-58 -63.82,-58 -63.79,-58 -63.76,-58 -63.73,-58 -63.7))"] |
|
WAIS Divide Replicate Core Methane Isotopic Data Set
|
1043522 |
2017-09-15 | Brook, Edward J. |
Collaborative Research: Replicate Coring at WAIS Divide to Obtain Additional Samples at Events of High Scientific Interest |
Data set contains stable isotope data set for methane in the WAIS Divide replicate core for the interval of 3009 to 2071 meters. These measurements were made by James Lee at the University of Bern as part of his PhD thesis and are the subject of a paper in preparation. | ["POLYGON((-112.085 -79.46,-112.0765 -79.46,-112.068 -79.46,-112.0595 -79.46,-112.051 -79.46,-112.0425 -79.46,-112.034 -79.46,-112.0255 -79.46,-112.017 -79.46,-112.0085 -79.46,-112 -79.46,-112 -79.4607,-112 -79.4614,-112 -79.4621,-112 -79.4628,-112 -79.4635,-112 -79.4642,-112 -79.4649,-112 -79.4656,-112 -79.4663,-112 -79.467,-112.0085 -79.467,-112.017 -79.467,-112.0255 -79.467,-112.034 -79.467,-112.0425 -79.467,-112.051 -79.467,-112.0595 -79.467,-112.068 -79.467,-112.0765 -79.467,-112.085 -79.467,-112.085 -79.4663,-112.085 -79.4656,-112.085 -79.4649,-112.085 -79.4642,-112.085 -79.4635,-112.085 -79.4628,-112.085 -79.4621,-112.085 -79.4614,-112.085 -79.4607,-112.085 -79.46))"] |
|
Antarctic Tephra Data Base AntT static web site
|
1142007 1142069 |
2017-09-13 | Kurbatov, Andrei V.; Dunbar, Nelia |
Collaborative Research: Developing an Antarctic Tephra Database for Interdisciplinary Paleoclimate Research (AntT) |
This collaborative interdisciplinary research project aims to consolidate, into a single user-friendly database, information about volcanic products detected in Antarctica. By consolidating information about volcanic sources, and physical and geochemical characteristics of volcanic products, this systematic data collection approach will improve the ability of researchers to identify volcanic ash, or tephra, from specific volcanic eruptions that may be spread over large areas in a geologically instantaneous amount of time. AntT database is designed to assist in the identification and cross-correlation of time intervals in various paleoclimate archives that contain volcanic layers from often unknown sources. | ["POLYGON((0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,216 -60,252 -60,288 -60,324 -60,360 -60,360 -63,360 -66,360 -69,360 -72,360 -75,360 -78,360 -81,360 -84,360 -87,360 -90,324 -90,288 -90,252 -90,216 -90,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,0 -87,0 -84,0 -81,0 -78,0 -75,0 -72,0 -69,0 -66,0 -63,0 -60))"] |
|
Mean surface mass balance over Larsen C ice shelf, Antarctica (1979-2014), assimilated to in situ GPR and snow height data
|
0732946 |
2017-09-13 | McGrath, Daniel; Steffen, Konrad; Kuipers Munneke, Peter |
IPY: Stability of Larsen C Ice Shelf in a Warming Climate |
We produce a reconstruction of surface mass balance (SMB) (in mm w.e. per year) by adjusting the 1979-2014 RACMO2 SMB to the spatial pattern of ground-penetrating radar observations and to observations of SMB from sonic height rangers. | ["POLYGON((-66 -66,-65.4 -66,-64.8 -66,-64.2 -66,-63.6 -66,-63 -66,-62.4 -66,-61.8 -66,-61.2 -66,-60.6 -66,-60 -66,-60 -66.4,-60 -66.8,-60 -67.2,-60 -67.6,-60 -68,-60 -68.4,-60 -68.8,-60 -69.2,-60 -69.6,-60 -70,-60.6 -70,-61.2 -70,-61.8 -70,-62.4 -70,-63 -70,-63.6 -70,-64.2 -70,-64.8 -70,-65.4 -70,-66 -70,-66 -69.6,-66 -69.2,-66 -68.8,-66 -68.4,-66 -68,-66 -67.6,-66 -67.2,-66 -66.8,-66 -66.4,-66 -66))"] |
|
Early Holocene methane records from Siple Dome, Antarctica
|
1043518 |
2017-09-11 | Yang, Ji-Woong; Ahn, Jinho |
Collaborative Research: Completing an ultra-high resolution methane record from the WAIS Divide ice core |
Below we present the early Holocene discrete CH4 dataset from Siple Dome (SDMA), Antarctica, measured at Oregon State University (OSU) and Seoul National University (SNU) by discrete wet extraction technique. Analytical method is described in Grachev et al. (2009) and Mitchell et al. (2011) for OSU data, and Yang et al. (2017) for SNU data. SDMA CH4 composite record was constructed by combining OSU data for 7.6 - 9.0 ka and SNU data for 9.0 - 11.6 ka to maximize temporal resolution. SDMA gas chronology was synchronized to Greenland Ice Core Chronology 2005 (GICC05) scale. For detailed description on synchronization and age uncertainty please refer to Yang et al. (2017). | ["POLYGON((-113 -79,-112.8 -79,-112.6 -79,-112.4 -79,-112.2 -79,-112 -79,-111.8 -79,-111.6 -79,-111.4 -79,-111.2 -79,-111 -79,-111 -79.1,-111 -79.2,-111 -79.3,-111 -79.4,-111 -79.5,-111 -79.6,-111 -79.7,-111 -79.8,-111 -79.9,-111 -80,-111.2 -80,-111.4 -80,-111.6 -80,-111.8 -80,-112 -80,-112.2 -80,-112.4 -80,-112.6 -80,-112.8 -80,-113 -80,-113 -79.9,-113 -79.8,-113 -79.7,-113 -79.6,-113 -79.5,-113 -79.4,-113 -79.3,-113 -79.2,-113 -79.1,-113 -79))"] |
|
SUMO unmanned aerial system (UAS) atmospheric data
|
1245737 |
2017-09-07 | Cassano, John |
Collaborative Research: Antarctic Automatic Weather Station Program 2013-2017 |
Atmospheric boundary layer temperature, humidity, pressure, and wind profile data collected with the Small Unmanned Meteorological Observer (SUMO) unmanned aerial system (UAS) | ["POLYGON((161.714 -77.522,162.6077 -77.522,163.5014 -77.522,164.3951 -77.522,165.2888 -77.522,166.1825 -77.522,167.0762 -77.522,167.9699 -77.522,168.8636 -77.522,169.7573 -77.522,170.651 -77.522,170.651 -77.6702,170.651 -77.8184,170.651 -77.9666,170.651 -78.1148,170.651 -78.263,170.651 -78.4112,170.651 -78.5594,170.651 -78.7076,170.651 -78.8558,170.651 -79.004,169.7573 -79.004,168.8636 -79.004,167.9699 -79.004,167.0762 -79.004,166.1825 -79.004,165.2888 -79.004,164.3951 -79.004,163.5014 -79.004,162.6077 -79.004,161.714 -79.004,161.714 -78.8558,161.714 -78.7076,161.714 -78.5594,161.714 -78.4112,161.714 -78.263,161.714 -78.1148,161.714 -77.9666,161.714 -77.8184,161.714 -77.6702,161.714 -77.522))"] |
|
Firn-temperature time series in Dronning Maud Land, East Antarctica
|
1142085 |
2017-09-05 | Muto, Atsuhiro |
Revealing Late Holocence Climate Variability in Antarctica from Borehole Paleothermometry |
["POLYGON((0 -75,5.489 -75,10.978 -75,16.467 -75,21.956 -75,27.445 -75,32.934 -75,38.423 -75,43.912 -75,49.401 -75,54.89 -75,54.89 -75.763,54.89 -76.526,54.89 -77.289,54.89 -78.052,54.89 -78.815,54.89 -79.578,54.89 -80.341,54.89 -81.104,54.89 -81.867,54.89 -82.63,49.401 -82.63,43.912 -82.63,38.423 -82.63,32.934 -82.63,27.445 -82.63,21.956 -82.63,16.467 -82.63,10.978 -82.63,5.489 -82.63,0 -82.63,0 -81.867,0 -81.104,0 -80.341,0 -79.578,0 -78.815,0 -78.052,0 -77.289,0 -76.526,0 -75.763,0 -75))"] | |
|
Snow Radar Echograms
|
0424589 |
2017-08-28 | Paden, John; Leuschen, Carl; Rodriguez, Fernando; Li, Jilu; Allen, Chris; Gogineni, Prasad |
Center for Remote Sensing of Ice Sheets (CReSIS) |
The Snow Radar data set contains L1B Geolocated Radar Echo Strength Profiles over Antarctica taken with the CReSIS snow radar. The L1B data set includes echograms with measurements for time, latitude, longitude, elevation, as well as flight path charts and echogram images. | ["POLYGON((163.9 -76.5,164.09 -76.5,164.28 -76.5,164.47 -76.5,164.66 -76.5,164.85 -76.5,165.04 -76.5,165.23 -76.5,165.42 -76.5,165.61 -76.5,165.8 -76.5,165.8 -76.57,165.8 -76.64,165.8 -76.71,165.8 -76.78,165.8 -76.85,165.8 -76.92,165.8 -76.99,165.8 -77.06,165.8 -77.13,165.8 -77.2,165.61 -77.2,165.42 -77.2,165.23 -77.2,165.04 -77.2,164.85 -77.2,164.66 -77.2,164.47 -77.2,164.28 -77.2,164.09 -77.2,163.9 -77.2,163.9 -77.13,163.9 -77.06,163.9 -76.99,163.9 -76.92,163.9 -76.85,163.9 -76.78,163.9 -76.71,163.9 -76.64,163.9 -76.57,163.9 -76.5))"] |
|
Ku-band Radar Echograms
|
0424589 |
2017-08-28 | Paden, John; Leuschen, Carl; Rodriguez, Fernando; Li, Jilu; Allen, Chris; Gogineni, Prasad |
Center for Remote Sensing of Ice Sheets (CReSIS) |
The Ku-band Radar data set contains L1B Geolocated Radar Echo Strength Profiles over Antarctica taken with the CReSIS Ku-band Radar. The L1B data set includes echograms with measurements for time, latitude, longitude, elevation, as well as flight path charts and echogram images. | ["POLYGON((143 -76.5,145.61 -76.5,148.22 -76.5,150.83 -76.5,153.44 -76.5,156.05 -76.5,158.66 -76.5,161.27 -76.5,163.88 -76.5,166.49 -76.5,169.1 -76.5,169.1 -77.07,169.1 -77.64,169.1 -78.21,169.1 -78.78,169.1 -79.35,169.1 -79.92,169.1 -80.49,169.1 -81.06,169.1 -81.63,169.1 -82.2,166.49 -82.2,163.88 -82.2,161.27 -82.2,158.66 -82.2,156.05 -82.2,153.44 -82.2,150.83 -82.2,148.22 -82.2,145.61 -82.2,143 -82.2,143 -81.63,143 -81.06,143 -80.49,143 -79.92,143 -79.35,143 -78.78,143 -78.21,143 -77.64,143 -77.07,143 -76.5))"] |
|
Radar Depth Sounder Echograms and Ice Thickness
|
0424589 |
2017-08-28 | Paden, John; Leuschen, Carl; Rodriguez, Fernando; Li, Jilu; Allen, Chris; Gogineni, Prasad |
Center for Remote Sensing of Ice Sheets (CReSIS) |
The MCoRDS data set contains L1B Geolocated Radar Echo Strength Profile Images and L2 Ice Thickness, Ice Surface, and Ice Bottom elevations over Antarctica taken with the CReSIS Radar Depth Sounders (RDS). The L1B data set includes measurements for echograms, time, latitude, longitude, elevation, as well as flight path charts and echogram images.The L2 data set includes measurements for time, latitude, longitude, elevation, surface, bottom, and thickness. | ["POLYGON((143 -74.2,155.9 -74.2,168.8 -74.2,181.7 -74.2,194.6 -74.2,207.5 -74.2,220.4 -74.2,233.3 -74.2,246.2 -74.2,259.1 -74.2,272 -74.2,272 -75.5,272 -76.8,272 -78.1,272 -79.4,272 -80.7,272 -82,272 -83.3,272 -84.6,272 -85.9,272 -87.2,259.1 -87.2,246.2 -87.2,233.3 -87.2,220.4 -87.2,207.5 -87.2,194.6 -87.2,181.7 -87.2,168.8 -87.2,155.9 -87.2,143 -87.2,143 -85.9,143 -84.6,143 -83.3,143 -82,143 -80.7,143 -79.4,143 -78.1,143 -76.8,143 -75.5,143 -74.2))"] |
|
WAIS Divide d18Oatm and Siple Dome/WAIS Divide composite and individual delta epsilon LAND
|
0538657 |
2017-08-18 | Seltzer, Alan; Severinghaus, Jeffrey P. |
Nitrogen and Oxygen Gas Isotopes in the WAIS Divide Ice Core as Constraints on Chronology, Temperature, and Accumulation Rate |
This data set contains measurements of d18Oatm (d18O of O2), d15N, dAr/N2, and dO2/N2 in gas bubbles from the WAIS Divide ice core. The time resolution is variable throughout the record but is ~100 years on average (from 65 ka to present). All measurements were made in the Noble Gas Isotope Laboratory at Scripps Institution of Oceanography (La Jolla, CA). The data set includes all replicate measurements as well as replicate-mean values and a calculation of measurement precision (pooled standard deviation). The second sheet of this data set includes fitted d18Oatm curves for the past 50 ka from both the WAIS Divide and Siple Dome Antarctic ice cores, both on the WD2014 timescale (Buizert et al., 2015). The second sheet also includes calculations of the time derivative of d18Oatm and d e LAND in both ice cores individual as well as in a composite record. Details of the entire data set and all relevant methods are provided in Seltzer et al., 2017. | ["POLYGON((-113 -79,-112.8 -79,-112.6 -79,-112.4 -79,-112.2 -79,-112 -79,-111.8 -79,-111.6 -79,-111.4 -79,-111.2 -79,-111 -79,-111 -79.1,-111 -79.2,-111 -79.3,-111 -79.4,-111 -79.5,-111 -79.6,-111 -79.7,-111 -79.8,-111 -79.9,-111 -80,-111.2 -80,-111.4 -80,-111.6 -80,-111.8 -80,-112 -80,-112.2 -80,-112.4 -80,-112.6 -80,-112.8 -80,-113 -80,-113 -79.9,-113 -79.8,-113 -79.7,-113 -79.6,-113 -79.5,-113 -79.4,-113 -79.3,-113 -79.2,-113 -79.1,-113 -79))"] |
|
NBP14-02 JPC-54 and JPC-55 Pollen Assemblage data
|
1430550 |
2017-08-18 | Shevenell, Amelia; Smith, Catherine; Domack, Eugene Walter |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
Pollen assemblage data for Paleocene to early to middle Eocene sediments collected on Totten continental shelf, East Antarctica. | ["POLYGON((120 -66,120.1 -66,120.2 -66,120.3 -66,120.4 -66,120.5 -66,120.6 -66,120.7 -66,120.8 -66,120.9 -66,121 -66,121 -66.4,121 -66.8,121 -67.2,121 -67.6,121 -68,121 -68.4,121 -68.8,121 -69.2,121 -69.6,121 -70,120.9 -70,120.8 -70,120.7 -70,120.6 -70,120.5 -70,120.4 -70,120.3 -70,120.2 -70,120.1 -70,120 -70,120 -69.6,120 -69.2,120 -68.8,120 -68.4,120 -68,120 -67.6,120 -67.2,120 -66.8,120 -66.4,120 -66))"] |
|
NBP14-02 JPC-55 Bulk Sediment Carbon and Nitrogen data
|
1430550 |
2017-08-18 | Smith, Catherine; Shevenell, Amelia; Domack, Eugene Walter |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
Bulk sediment carbon and nitrogen data data for Paleocene sediments collected on Totten continental shelf, East Antarctica. | ["POLYGON((120 -66,120.1 -66,120.2 -66,120.3 -66,120.4 -66,120.5 -66,120.6 -66,120.7 -66,120.8 -66,120.9 -66,121 -66,121 -66.4,121 -66.8,121 -67.2,121 -67.6,121 -68,121 -68.4,121 -68.8,121 -69.2,121 -69.6,121 -70,120.9 -70,120.8 -70,120.7 -70,120.6 -70,120.5 -70,120.4 -70,120.3 -70,120.2 -70,120.1 -70,120 -70,120 -69.6,120 -69.2,120 -68.8,120 -68.4,120 -68,120 -67.6,120 -67.2,120 -66.8,120 -66.4,120 -66))"] |
|
NBP14-02 JPC-55 foraminifer assemblage data
|
1143836 |
2017-08-18 | Shevenell, Amelia; Leventer, Amy |
Collaborative Research: Totten Glacier System and the Marine Record of Cryosphere - Ocean Dynamics |
Foraminifer assemblage data for Paleocene sediments collected on Totten continental shelf, East Antarctica. | ["POLYGON((120 -66,120.1 -66,120.2 -66,120.3 -66,120.4 -66,120.5 -66,120.6 -66,120.7 -66,120.8 -66,120.9 -66,121 -66,121 -66.4,121 -66.8,121 -67.2,121 -67.6,121 -68,121 -68.4,121 -68.8,121 -69.2,121 -69.6,121 -70,120.9 -70,120.8 -70,120.7 -70,120.6 -70,120.5 -70,120.4 -70,120.3 -70,120.2 -70,120.1 -70,120 -70,120 -69.6,120 -69.2,120 -68.8,120 -68.4,120 -68,120 -67.6,120 -67.2,120 -66.8,120 -66.4,120 -66))"] |
|
Thermal windows and metabolic performance curves in a developing Antarctic fish
|
1142122 |
2017-08-07 | Todgham, Anne; Miller, Nathan |
RUI: Synergistic effects of Ocean Acidification and Warming on Larval Development in Antarctic Fishes |
This dataset includes data from the publication Flynn and Todgham 2017 - Thermal windows and metabolic performance curves in a developing Antarctic fish. Included are data on embryo survival, development, and metabolic rate. | ["POLYGON((166.5 -77.5,166.55 -77.5,166.6 -77.5,166.65 -77.5,166.7 -77.5,166.75 -77.5,166.8 -77.5,166.85 -77.5,166.9 -77.5,166.95 -77.5,167 -77.5,167 -77.55,167 -77.6,167 -77.65,167 -77.7,167 -77.75,167 -77.8,167 -77.85,167 -77.9,167 -77.95,167 -78,166.95 -78,166.9 -78,166.85 -78,166.8 -78,166.75 -78,166.7 -78,166.65 -78,166.6 -78,166.55 -78,166.5 -78,166.5 -77.95,166.5 -77.9,166.5 -77.85,166.5 -77.8,166.5 -77.75,166.5 -77.7,166.5 -77.65,166.5 -77.6,166.5 -77.55,166.5 -77.5))"] |
|
Antarctic emerald rockcod have the capacity to compensate for warming when uncoupled from CO2-acidification
|
1142122 |
2017-08-07 | Todgham, Anne; Miller, Nathan |
RUI: Synergistic effects of Ocean Acidification and Warming on Larval Development in Antarctic Fishes |
This dataset includes data from the publication Davis et al - Antarctic emerald rockcod have the capacity to compensate for warming when uncoupled from CO2-acidification. Included are data on cardiorespiratory physiology, survival, metabolic rate, metabolic enzyme activity, behavior (scototaxis & activity) and seawater chemistry. | ["POLYGON((166 -77.5,166.1 -77.5,166.2 -77.5,166.3 -77.5,166.4 -77.5,166.5 -77.5,166.6 -77.5,166.7 -77.5,166.8 -77.5,166.9 -77.5,167 -77.5,167 -77.55,167 -77.6,167 -77.65,167 -77.7,167 -77.75,167 -77.8,167 -77.85,167 -77.9,167 -77.95,167 -78,166.9 -78,166.8 -78,166.7 -78,166.6 -78,166.5 -78,166.4 -78,166.3 -78,166.2 -78,166.1 -78,166 -78,166 -77.95,166 -77.9,166 -77.85,166 -77.8,166 -77.75,166 -77.7,166 -77.65,166 -77.6,166 -77.55,166 -77.5))"] |
|
Antarctic Ice Core Tephra Analysis
|
1142007 |
2017-08-03 | Wheatley, Sarah D.; Kurbatov, Andrei V. |
Collaborative Research: Developing an Antarctic Tephra Database for Interdisciplinary Paleoclimate Research (AntT) |
This dataset contains ice core tephra geochemical data from 5 temporal intervals in the RICE, WDC-06A, SPRESSO, and SPICE ice cores. The temporal intervals included are 1991 C.E., 1963 C.E., 1815 C.E., 1809 C.E., and 1257 C.E. These intervals are often analyzed for volcanic sulfate by ice core scientists. The volcanic events associated with these intervals caused global weather and climate phenomena and are often used by climate modelers as well to understand volcanic sulfate loading on the climate. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Late Holocene paleoecological and paleoclimatic data from moss peatbanks in the western Antarctic Peninsula
|
1246190 |
2017-07-24 | Yu, Zicheng |
Collaborative Research: Response of Carbon Accumulation in Moss Peatbanks to Past Warm Climates in the Antarctic Peninsula |
We used subfossil mosses and peats to document changes in regional climate, cryosphere, and terrestrial ecosystems in the western Antarctic Peninsula at ~65S latitude. We find that most peat-forming ecosystems have initiated since 2800 cal BP, in response to warmer summers and increasing summer insolation. The period at 900-600 cal BP was coldest as indicated by ice advance, abundance of kill ages from ice-entombed mosses exposed recently from retreating glacial ice, and apparent gap in peatbank initiation. Furthermore, the discovery of a novel Antarctic hairgrass (Deschampsia antarctica) peatland at 2300-1200 cal BP from the mainland Antarctic Peninsula suggests a much warmer climate than the present. A warming and wetting climate in the 1980s caused very high carbon accumulation in a Polytrichum strictum moss peatbank. Our results document dramatic transformations of landscape and ecosystems in response to past warmer climate, providing a telltale sign for what may come in the future. | ["POLYGON((-68.5 -64,-67.73 -64,-66.96 -64,-66.19 -64,-65.42 -64,-64.65 -64,-63.88 -64,-63.11 -64,-62.34 -64,-61.57 -64,-60.8 -64,-60.8 -64.36,-60.8 -64.72,-60.8 -65.08,-60.8 -65.44,-60.8 -65.8,-60.8 -66.16,-60.8 -66.52,-60.8 -66.88,-60.8 -67.24,-60.8 -67.6,-61.57 -67.6,-62.34 -67.6,-63.11 -67.6,-63.88 -67.6,-64.65 -67.6,-65.42 -67.6,-66.19 -67.6,-66.96 -67.6,-67.73 -67.6,-68.5 -67.6,-68.5 -67.24,-68.5 -66.88,-68.5 -66.52,-68.5 -66.16,-68.5 -65.8,-68.5 -65.44,-68.5 -65.08,-68.5 -64.72,-68.5 -64.36,-68.5 -64))"] |
|
Snowpit evidence of the 2011 Puyehue-Cordon Caulle (Chile) eruption in West Antarctica
|
0636740 |
2017-07-11 | Koffman, Bess; Kreutz, Karl |
Collaborative Research: Microparticle/tephra analysis of the WAIS Divide ice core |
We present several related datasets from a 2012 snow pit and a 2013 firn core collected near the WAIS Divide field camp in West Antarctica. The data include soluble ions (sodium and non-sea-salt sulfate) and dust particle concentrations, as well as major oxide geochemistry of tephra grains isolated from snow samples. Based on these data, we found evidence of deposition from the 2011 Puyehue Cordon-Caulle (Chile) volcanic eruption at WAIS Divide. | ["POINT(-112.086 -79.468)"] |
|
Holocene Black Carbon in Antarctica
|
0839093 |
2017-06-19 | McConnell, Joseph; Arienzo, Monica |
Collaborative Research: Integrated High Resolution Chemical and Biological Measurements on the Deep WAIS Divide Core |
Black carbon (BC) and other biomass-burning (BB) aerosols are critical components of climate forcing but quantification, predictive climate modeling, and policy decisions have been hampered by limited understanding of the climate drivers of BB and by the lack of long-term records. Prior modeling studies suggested that increased Northern Hemisphere anthropogenic BC emissions increased recent temperatures and regional precipitation, including a northward shift in the Inter-Tropical Convergence Zone (ITCZ). Two Antarctic ice cores were analyzed for BC and the longest record shows that the highest BC deposition during the Holocene occurred ~8-6k years before present in a period of relatively high austral burning season and low growing season insolation. Atmospheric transport modeling suggests South America (SA) as the dominant source of modern Antarctic BC and, consistent with the ice-core record, climate model experiments using mid-Holocene and preindustrial insolation simulate comparable increases in carbon loss due to fires in SA during the mid-Holocene. SA climate proxies document a northward shifted ITCZ and weakened SA Summer Monsoon (SASM) during this period, with associated impacts on hydroclimate and burning. A second Antarctic ice core spanning the last 2.5k years documents similar linkages between hydroclimate and BC, with the lowest deposition during the Little Ice Age characterized by a southerly shifted ITCZ and strengthened SASM. These new results indicate that insolation-driven changes in SA hydroclimate and BB, likely linked to the position of the ITCZ, modulated Antarctic BC deposition during most of the Holocene and suggests connections and feedbacks between future BC emissions and hydroclimate. | ["POLYGON((161.41425 -77.73489,161.486884 -77.73489,161.559518 -77.73489,161.632152 -77.73489,161.704786 -77.73489,161.77742 -77.73489,161.850054 -77.73489,161.922688 -77.73489,161.995322 -77.73489,162.067956 -77.73489,162.14059 -77.73489,162.14059 -77.747868,162.14059 -77.760846,162.14059 -77.773824,162.14059 -77.786802,162.14059 -77.79978,162.14059 -77.812758,162.14059 -77.825736,162.14059 -77.838714,162.14059 -77.851692,162.14059 -77.86467,162.067956 -77.86467,161.995322 -77.86467,161.922688 -77.86467,161.850054 -77.86467,161.77742 -77.86467,161.704786 -77.86467,161.632152 -77.86467,161.559518 -77.86467,161.486884 -77.86467,161.41425 -77.86467,161.41425 -77.851692,161.41425 -77.838714,161.41425 -77.825736,161.41425 -77.812758,161.41425 -77.79978,161.41425 -77.786802,161.41425 -77.773824,161.41425 -77.760846,161.41425 -77.747868,161.41425 -77.73489))"] |
|
Taylor Glacier Gas Isotope Data
|
0839031 |
2017-06-16 | Severinghaus, Jeffrey P. |
Collaborative Research: A "Horizontal Ice Core" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica |
Taylor Glacier Gas Isotope Data | ["POLYGON((161.41425 -77.73489,161.486884 -77.73489,161.559518 -77.73489,161.632152 -77.73489,161.704786 -77.73489,161.77742 -77.73489,161.850054 -77.73489,161.922688 -77.73489,161.995322 -77.73489,162.067956 -77.73489,162.14059 -77.73489,162.14059 -77.747868,162.14059 -77.760846,162.14059 -77.773824,162.14059 -77.786802,162.14059 -77.79978,162.14059 -77.812758,162.14059 -77.825736,162.14059 -77.838714,162.14059 -77.851692,162.14059 -77.86467,162.067956 -77.86467,161.995322 -77.86467,161.922688 -77.86467,161.850054 -77.86467,161.77742 -77.86467,161.704786 -77.86467,161.632152 -77.86467,161.559518 -77.86467,161.486884 -77.86467,161.41425 -77.86467,161.41425 -77.851692,161.41425 -77.838714,161.41425 -77.825736,161.41425 -77.812758,161.41425 -77.79978,161.41425 -77.786802,161.41425 -77.773824,161.41425 -77.760846,161.41425 -77.747868,161.41425 -77.73489))"] |
|
Seasonal Succession of Bacterial Communities in Coastal Waters of the Western Antarctic Peninsula
|
1141993 |
2017-06-12 | Rich, Jeremy |
Collaborative Research: Microbial Community Assembly in Coastal Waters of the Western Antarctic Peninsula |
From winter to late summer during the 2013-2014 season at Palmer Station, Antarctica, we collected weekly to bi-weekly samples of the seawater intake to measure changes in bacterial community composition, based on sequencing 16S rRNA genes. Along with the sequences, we collected data on environmental parameters in the samples (chlorophyll a, bacterial production, salinity, nutrients, bacterial cell numbers, and particulate organic carbon and nitrogen). | ["POINT(-64.05 -64.77)"] |
|
Seasonal 17O Isotope Data from Lake Vostok and WAIS Divide Snow Pits
|
1341360 |
2017-06-05 | Steig, Eric J.; Schoenemann, Spruce |
Development of a Laser Spectroscopy System for Analysis of 17Oexcess on Ice Cores |
Seasonal 17O Isotope Data from Lake Vostok and WAIS Divide Snow Pits | ["POINT(-112.08 -79.46)", "POINT(106 -77.5)"] |
|
WAIS Divide WDC06A Core Quality Versus Depth
|
0944348 0944266 |
2017-06-01 | Taylor, Kendrick C.; Souney, Joseph Jr.; Twickler, Mark |
Collaborative Research: Climate, Ice Dynamics and Biology using a Deep Ice Core from the West Antarctic Ice Sheet Ice Divide |
Qualitative assessment of ice-core quality versus depth for the deep WAIS Divide WDC06A ice core. The depths and core quality ratings presented here are from the field observations made at WAIS Divide, Antarctica, during the course of the drilling of the ice core. Depths are in meters. Core quality ratings were defined are as follows. Excellent: -1 breaks/no fractures; Very Good: -2 breaks/90% no fractures; Good: -3 breaks/50% no fractures; Fair: >10 cm without fractures; Poor: >10 cm without through fractures; Very Poor: <10 cm without through fractures. | ["POINT(-112.08 -79.46)"] |
|
Physiological and biochemical measurements on Antarctic dragonfish (Gymnodraco acuticeps) from McMurdo Sound
|
1142122 |
2017-06-01 | Miller, Nathan; Todgham, Anne; Davis, Brittany; Flynn, Erin |
RUI: Synergistic effects of Ocean Acidification and Warming on Larval Development in Antarctic Fishes |
This dataset includes data from the publication "Flynn, et al. (2015) - Ocean acidification exerts negative effects under warming conditions in a developing Antarctic fish". Included are data on embryo survival, development, metabolic rate, metabolic enzyme activity (citrate synthase), whole embryo osmolality and seawater chemistry. | ["POLYGON((166.163 -76.665,166.2635 -76.665,166.364 -76.665,166.4645 -76.665,166.565 -76.665,166.6655 -76.665,166.766 -76.665,166.8665 -76.665,166.967 -76.665,167.0675 -76.665,167.168 -76.665,167.168 -76.782,167.168 -76.899,167.168 -77.016,167.168 -77.133,167.168 -77.25,167.168 -77.367,167.168 -77.484,167.168 -77.601,167.168 -77.718,167.168 -77.835,167.0675 -77.835,166.967 -77.835,166.8665 -77.835,166.766 -77.835,166.6655 -77.835,166.565 -77.835,166.4645 -77.835,166.364 -77.835,166.2635 -77.835,166.163 -77.835,166.163 -77.718,166.163 -77.601,166.163 -77.484,166.163 -77.367,166.163 -77.25,166.163 -77.133,166.163 -77.016,166.163 -76.899,166.163 -76.782,166.163 -76.665))"] |
|
Biosamples and observations from Weddell Seal colonies in McMurdo Sound during the 2015-2016 Antarctic field season
|
1443554 |
2017-05-27 | Hindle, Allyson; Buys, Emmanuel |
Unraveling the Genomic and Molecular Basis of the Dive Response: Nitric Oxide Signaling and Vasoregulation in the Weddell Seal |
The Weddell seal is a champion diving mammal - key elements of their physiological specializations to breath-hold are their ability for remarkable adjustment of their heart and blood vessel system, coordinating blood pressure and flow to specific body regions based on their metabolic requirements, and their ability to sustain periods without oxygen. The goal of this study is to unravel the molecular mechanisms underlying the dive response, specifically, to study a signaling pathway that coordinates local blood flow. This dataset identifies what animals were sampled and the details of what biosamples were collected to test the hypothesis that signaling modifications prevent local blood vessel changes under low oxygen conditions, thereby allowing the centrally mediated diving reflex to override local perfusion control. The metadata also details cryopreserved cells and cell lines that can be used to study the molecular effects of low oxygen conditions in the laboratory | ["POLYGON((166.163 -76.665,166.2635 -76.665,166.364 -76.665,166.4645 -76.665,166.565 -76.665,166.6655 -76.665,166.766 -76.665,166.8665 -76.665,166.967 -76.665,167.0675 -76.665,167.168 -76.665,167.168 -76.782,167.168 -76.899,167.168 -77.016,167.168 -77.133,167.168 -77.25,167.168 -77.367,167.168 -77.484,167.168 -77.601,167.168 -77.718,167.168 -77.835,167.0675 -77.835,166.967 -77.835,166.8665 -77.835,166.766 -77.835,166.6655 -77.835,166.565 -77.835,166.4645 -77.835,166.364 -77.835,166.2635 -77.835,166.163 -77.835,166.163 -77.718,166.163 -77.601,166.163 -77.484,166.163 -77.367,166.163 -77.25,166.163 -77.133,166.163 -77.016,166.163 -76.899,166.163 -76.782,166.163 -76.665))"] |
|
Specimen logs and observations from Weddell Seal colonies in Erebus Bay, 2013-2017
|
1246463 |
2017-05-24 | Burns, Jennifer |
The Cost of A New Fur Coat: Interactions between Molt and Reproduction in Weddell Seals |
This dataset includes an inventory of Weddell Seals captured by net, tagged, and observed at colonies in the Erebus Bay region of Antarctica during 4 austral field seasons between November 2013 and February 2017. Observations recorded include body mass, length, and molt category. | ["POINT(166.55 -77.75)"] |
|
Measurements of 14C-methane for the Younger Dryas - Preboreal Transition from Taylor Glacier, Antarctica
|
1245659 |
2017-05-24 | Petrenko, Vasilii; Severinghaus, Jeffrey P. |
Collaborative Research: A "Horizontal Ice Core" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica |
This dataset contains measurements of paleoatmospheric 14C of methane (14CH4) for the Younger Dryas - Preboreal Transition from Taylor Glacier, Antarctica, as well as a range of supporting data. The supporting data include [CH4], [CO], [14CO], sample ages, CH4 emissions and analysis of uncertainties. | ["POINT(161.71353 -77.75855)"] |
|
Rebreather Testing for the United States Antarctic Scientific Diving Program
|
1553824 |
2017-05-12 | Heine, John |
Rebreather Testing for the United States Antarctic Scientific Diving Program |
Overall dataset and specific temperature data for a number of different rebreather models. | ["POLYGON((163 -78,163.4 -78,163.8 -78,164.2 -78,164.6 -78,165 -78,165.4 -78,165.8 -78,166.2 -78,166.6 -78,167 -78,167 -78.05,167 -78.1,167 -78.15,167 -78.2,167 -78.25,167 -78.3,167 -78.35,167 -78.4,167 -78.45,167 -78.5,166.6 -78.5,166.2 -78.5,165.8 -78.5,165.4 -78.5,165 -78.5,164.6 -78.5,164.2 -78.5,163.8 -78.5,163.4 -78.5,163 -78.5,163 -78.45,163 -78.4,163 -78.35,163 -78.3,163 -78.25,163 -78.2,163 -78.15,163 -78.1,163 -78.05,163 -78))"] |
|
WAIS Divide WDC06A Discrete ICP-MS Chemistry
|
0636740 |
2017-04-27 | Kreutz, Karl |
Collaborative Research: Microparticle/tephra analysis of the WAIS Divide ice core |
This dataset includes discrete ICP-MS chemistry data generated at the University of Maine for the top 577 m of the WAIS Divide deep ice core (WDC06A). There are two parallel datasets, produced from a single set of samples that were melted continuously, collected by fraction collector and split manually (by pouring). The first set was acidified to 10% v/v nitric acid and allowed to leach for one month prior to analysis. These are referred to as "total" samples (see below). The second set were filtered using individual hand-held 0.45 um filters and syringes, then acidified to 10% v/v nitric acid and analyzed. These are referred to as "dissolved" samples. Reported depths are based on values assigned during melting; please note that these are subject to change. Please contact Karl and Bess if you plan to use the data or have any questions. | ["POINT(-112.1115 -79.481)"] |
|
WAIS Divide WDC06A Nitrate Isotope Record
|
1246223 |
2017-04-26 | Buffen, Aron; Hastings, Meredith |
Investigating Source, Chemistry and Climate changes using the Isotopic Composition of Nitrate in Antarctic Snow and Ice |
This dataset contains nitrate concentration and isotopic composition (d15N, d18O, D17O) measurements on the WAIS Divide WDC06A ice core. | ["POINT(-112.1115 -79.481)"] |
|
Summary of Results from the WAIS Divide Ice Core Project
|
0944348 |
2017-04-24 | Taylor, Kendrick C. |
Collaborative Research: Climate, Ice Dynamics and Biology using a Deep Ice Core from the West Antarctic Ice Sheet Ice Divide |
This is a summary of results 2005-2016 from the NSF-funded WAIS Divide Ice Core project, compiled by the Science Coordination Office. | ["POINT(-112.1115 -79.481)"] |
|
Vertebrate fossils from the Hanson Formation at Mt. Kirkpatrick, in the Beardmore Glacier region of Antarctica
|
1246379 |
2017-03-29 | Smith, Nathan |
Collaborative Research: Continued Research on the Jurassic Vertebrate Fauna from the Beardmore Glacier Region of Antarctica |
This proposal supports research on the Early Jurassic Hanson Formation vertebrate fauna of the Beardmore Glacier region of Antarctica. The project supports preparation and systematic and paleobiological research on four Antarctic dinosaurs, including two new species, collected in the Central Transantarctic Mountains. With the new material Cryolophosaurus will become one of the most complete Early Jurassic theropods known, and thus has the potential to become a keystone taxon for resolving the debated early evolutionary history of theropod dinosaurs, the group that gave rise to birds. Two new dinosaur specimens include a nearly complete articulated skeleton of a juvenile sauropodomorph, and the articulated hip region of another small individual. Both appear to be new taxa. The dinosaurs from the Hanson Formation represent some of the highest paleolatitude vertebrates known from the Jurassic. The PIs generated CT datasets for Cryolophosaurus and the more complete new sauropodomorph species to mine for phylogenetic trait information, and to investigate their comparative neuroanatomy and feeding behavior. Histological datasets have been generated from multiple skeletal elements for all four Mt. Kirkpatrick taxa to understand patterns of growth in different clades of polar dinosaurs and compare them to relatives from lower paleolatitudes. This paleohistological study of a relatively diverse sample of sauropodomorph taxa from Antarctica may contribute to determining whether and how these dinosaurs responded to contemporary climatic extremes. The PIs have established a successful undergraduate training program as part of previous research. Summer interns from Augustana are trained at the Field Museum in specimen preparation, curation, molding/casting, and histological sampling. They also participate in existing Field Museum REU programs, including a course on phylogenetic systematics. Four undergraduate internships and student research projects will be supported through this proposal. A postdoctoral researcher has also been supported on this project The PIs are developing a traveling exhibit on Antarctic Dinosaurs that they estimate will be seen by over 2 million people over the five-year tour (opening June 2018 at the Field Museum of Natural History). | ["POLYGON((160 -85,160.6 -85,161.2 -85,161.8 -85,162.4 -85,163 -85,163.6 -85,164.2 -85,164.8 -85,165.4 -85,166 -85,166 -85.2,166 -85.4,166 -85.6,166 -85.8,166 -86,166 -86.2,166 -86.4,166 -86.6,166 -86.8,166 -87,165.4 -87,164.8 -87,164.2 -87,163.6 -87,163 -87,162.4 -87,161.8 -87,161.2 -87,160.6 -87,160 -87,160 -86.8,160 -86.6,160 -86.4,160 -86.2,160 -86,160 -85.8,160 -85.6,160 -85.4,160 -85.2,160 -85))"] |
|
WAIS Divide Ice-Core Chronology from Intermediate Core WDC05Q
|
0538427 |
2017-03-28 | McConnell, Joseph |
Trace and Ultra-Trace Chemistry Measurements of the WAIS Divide Ice Core |
A state-of-the-art continuous ice core analytical system was used to analyze samples from 0 to ~130 m depth of the recently collected intermediate core WDC05Q from West Antarctica. Interpretation of these records and publication of findings is ongoing. | ["POINT(-112.1115 -79.481)"] |
|
WD2014: Timescale for WAIS Divide Core 2006 A (WDC-06A)
|
0944197 |
2017-03-28 | Fudge, T. J. |
Collaborative Research: Establishing the Chronology and Histories of Accumulation and Ice Dynamics for the WAIS Divide Core |
The West Antarctic Ice Sheet Divide (WAIS Divide, WD) ice core is a newly drilled, high-accumulation deep ice core that provides Antarctic climate records of the past ~68 ka at unprecedented temporal resolution. The upper 2850 m (back to 31.2 ka BP) have been dated using annual-layer counting. Here we present a chronology for the deep part of the core (67.8-31.2 ka BP), which is based on stratigraphic matching to annual-layer-counted Greenland ice cores using globally well-mixed atmospheric methane. We calculate the WD gas age-ice age difference (Delta age) using a combination of firn densification modeling, ice-flow modeling, and a data set of d15N-N2, a proxy for past firn column thickness. The largest Delta age at WD occurs during the Last Glacial Maximum, and is 525 +/- 120 years. Internally consistent solutions can be found only when assuming little to no influence of impurity content on densification rates, contrary to a recently proposed hypothesis. We synchronize the WD chronology to a linearly scaled version of the layer-counted Greenland Ice Core Chronology (GICC05), which brings the age of Dansgaard-Oeschger (DO) events into agreement with the U/Th absolutely dated Hulu Cave speleothem record. The small Delta age at WD provides valuable opportunities to investigate the timing of atmospheric greenhouse gas variations relative to Antarctic climate, as well as the interhemispheric phasing of the \"bipolar seesaw\". We present the WD2014 chronology for the upper part (0-2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes in the source, transport, and deposition of aerosols. The measurements were interpreted manually and with the aid of two automated methods. We validated the chronology by comparing to two high-accuracy, absolutely dated chronologies. For the Holocene, the cosmogenic isotope records of 10Be from WAIS Divide and 14C for IntCal13 demonstrated that WD2014 was consistently accurate to better than 0.5% of the age. For the glacial period, comparisons to the Hulu Cave chronology demonstrated that WD2014 had an accuracy of better than 1% of the age at three abrupt climate change events between 27 and 31ka. WD2014 has consistently younger ages than Greenland ice core chronologies during most of the Holocene. For the Younger Dryas-Preboreal transition (11.595 ka; 24 years younger) and the Bolling-Allerod Warming (14.621 ka; 7 years younger), WD2014 ages are within the combined uncertainties of the timescales. Given its high accuracy, WD2014 can become a reference chronology for the Southern Hemisphere, with synchronization to other chronologies feasible using high-quality proxies of volcanism, solar activity, atmospheric mineral dust, and atmospheric methane concentrations. | ["POINT(-112.1115 -79.481)"] |
|
WAIS Divide Ice-Core Chronology from Intermediate Core WDC05A
|
0538427 |
2017-03-28 | McConnell, Joseph |
Trace and Ultra-Trace Chemistry Measurements of the WAIS Divide Ice Core |
A state-of-the-art continuous ice core analytical system was used to analyze samples from 0 to ~130 m depth of the recently collected intermediate core WDC05A from West Antarctica. Interpretation of these records and publication of findings is ongoing. | ["POINT(-112.1115 -79.481)"] |
|
Gas measurement from Higgins et al., 2015 - PNAS
|
0838849 |
2017-03-27 | Higgins, John |
Trace and Ultra-Trace Chemistry Measurements of the WAIS Divide Ice Core |
Measurements of Ar isotopes (40Ar/38Ar/36Ar) and other gas species (18O/16O of O2, 15N/14N of N2, O2/N2 and Ar/N2 ratios) from ice cores drilled in the Allan Hills Blue Ice Area | ["POLYGON((159.02 -76.67,159.057 -76.67,159.094 -76.67,159.131 -76.67,159.168 -76.67,159.205 -76.67,159.242 -76.67,159.279 -76.67,159.316 -76.67,159.353 -76.67,159.39 -76.67,159.39 -76.687,159.39 -76.704,159.39 -76.721,159.39 -76.738,159.39 -76.755,159.39 -76.772,159.39 -76.789,159.39 -76.806,159.39 -76.823,159.39 -76.84,159.353 -76.84,159.316 -76.84,159.279 -76.84,159.242 -76.84,159.205 -76.84,159.168 -76.84,159.131 -76.84,159.094 -76.84,159.057 -76.84,159.02 -76.84,159.02 -76.823,159.02 -76.806,159.02 -76.789,159.02 -76.772,159.02 -76.755,159.02 -76.738,159.02 -76.721,159.02 -76.704,159.02 -76.687,159.02 -76.67))"] |
|
WAIS Divide Ice-Core Aerosol Records from Intermediate Core WDC05Q
|
0538427 |
2017-03-23 | McConnell, Joseph |
Trace and Ultra-Trace Chemistry Measurements of the WAIS Divide Ice Core |
A state-of-the-art continuous ice core analytical system was used to analyze samples from 0 to ~130 m depth of the recently collected intermediate core WDC05Q from West Antarctica. Interpretation of these records and publication of findings is ongoing. | ["POINT(-112.1115 -79.481)"] |
|
WAIS Divide Ice-Core Aerosol Records from Intermediate Core WDC05A
|
0538427 |
2017-03-23 | McConnell, Joseph |
Trace and Ultra-Trace Chemistry Measurements of the WAIS Divide Ice Core |
A state-of-the-art continuous ice core analytical system was used to analyze samples from the firn portion (0 to ~70 m depth) of the recently collected intermediate core WDC05A from West Antarctica. Interpretation of these records and publication of findings is ongoing. | ["POINT(-112.1115 -79.481)"] |
|
WAIS Divide Ice-Core Aerosol Records from 1.5 to 577 m
|
0538427 |
2017-03-23 | McConnell, Joseph |
Trace and Ultra-Trace Chemistry Measurements of the WAIS Divide Ice Core |
A state-of-the-art continuous ice core analytical system was used to analyze samples from ~1.5 to ~577 m depth in the recently collected WAIS Divide deep ice core from West Antarctica. Interpretation of these records and publication of findings is ongoing. | ["POINT(-112.1115 -79.481)"] |
|
WAIS Divide Ice-Core Aerosol Records from 1300 to 3404 m
|
1142166 |
2017-03-22 | McConnell, Joseph |
Collaborative Research: Investigating Upper Pleistocene Rapid Climate Change using Continuous, Ultra-High-Resolution Aerosol and Gas Measurements in the WAIS Divide Ice Core |
A state-of-the-art continuous ice core analytical system was used to analyze ~3 cm by ~3 cm longitudinal samples from ~1300 to ~3404 m depth in the recently collected WAIS Divide deep ice core from West Antarctica. Interpretation of these records and publication of findings is ongoing. | ["POINT(-112.1115 -79.481)"] |
|
WAIS Divide sulfate and nitrate isotopes
|
0538049 |
2017-03-09 | Alexander, Becky; Steig, Eric J. |
Collaborative Research: Multiple-isotope Analysis of Nitrate and Sulfate in the West Antarctic Ice Sheet Divide Ice Core |
This data set contain oxygen isotopes of sulfate and nitrate and nitrogen isotopes of nitrate from the WAIS Divide ice core from the surface to 577 m depth at varying resolution | ["POINT(-112.085 -79.5)"] |
|
Fluorescence spectroscopy data from the West Antarctic Ice Sheet (WAIS) Divide ice core, WDC06A
|
0839075 |
2017-03-06 | Priscu, John; D'Andrilli, Juliana |
Collaborative Research: Integrated High Resolution Chemical and Biological Measurements on the Deep WAIS Divide Core |
This data set include depth (WDC06A-7 dating) and fluorescence intensity measurements for five fluorophore regions (A, C, M, B, and T) commonly found in natural organic matter. Data from 1300-1700m, 1700-2100m, and 2100-2700m correspond to the early Holocene, deglaciation period, and the Last Glacial Maximum. | ["POINT(-112.08648 -79.46763)"] |
|
Ground-based ice-penetrating radar profiles collected on the Allan Hills blue ice region
|
1443260 |
2017-03-03 | Conway, Howard |
Collaborative Research: Allan HILLs Englacial Site (AHILLES) Selection |
Low (7MHz) and high (20-100MHz) frequency ground-based ice-penetrating radar profiles collected on the Allan Hills blue ice region between January 19 and January 31, 2016. Data include .MAT files with low-frequency content; .DZX metadata, .DZT traces, and .KML tracklines with high-frequency content; and .PDF files with maps and figures. | ["POLYGON((159.02 -76.67,159.057 -76.67,159.094 -76.67,159.131 -76.67,159.168 -76.67,159.205 -76.67,159.242 -76.67,159.279 -76.67,159.316 -76.67,159.353 -76.67,159.39 -76.67,159.39 -76.687,159.39 -76.704,159.39 -76.721,159.39 -76.738,159.39 -76.755,159.39 -76.772,159.39 -76.789,159.39 -76.806,159.39 -76.823,159.39 -76.84,159.353 -76.84,159.316 -76.84,159.279 -76.84,159.242 -76.84,159.205 -76.84,159.168 -76.84,159.131 -76.84,159.094 -76.84,159.057 -76.84,159.02 -76.84,159.02 -76.823,159.02 -76.806,159.02 -76.789,159.02 -76.772,159.02 -76.755,159.02 -76.738,159.02 -76.721,159.02 -76.704,159.02 -76.687,159.02 -76.67))"] |
|
Accumulation Rates from the WAIS Divide Ice Core
|
0944197 |
2017-02-21 | Fudge, T. J.; Waddington, Edwin D.; Conway, Howard; Buizert, Christo |
Collaborative Research: Establishing the Chronology and Histories of Accumulation and Ice Dynamics for the WAIS Divide Core |
These data are the accumulation rate history for the WAIS Divide ice core in central West Antarctica. The data are in two parts: 1) the annual accumulation rates for the past ~31ka and 2) the firn gas-based accumulation rates from 31-67ka. | ["POINT(-112.1115 -79.481)"] |
|
Magnetic anomaly data over central Marie Byrd Land, West Antarctica (GIMBLE.GMGEO2)
|
1043761 |
2017-02-20 | Young, Duncan A.; Holt, John W.; Blankenship, Donald D. |
Geophysical Investigations of Marie Byrd Land Lithospheric Evolution (GIMBLE) |
GIMBLE was proposed as the first systematic aerogeophysical investigation of the subglacial massif underlying central Marie Byrd Land. Aerogeophysically configured Baslers conducted 14 flights from Byrd Surface Camp and WAIS Divide Camp over two field seasons (January 2013 and December 2014). Airborne ice penetrating radar, gravity and magnetics were the primary datasets collected. Level 2 data represent geolocated geophysical properties (e.g ice thickness), derived from Level 1B measurements (e.g. radar echo delay). Dataset structures are based on those used for Operation Ice Bridge, and are line based data in ASCII space delimited .txt files, with a header delimited by leading "#" characters documenting column assignment and metadata. Georefering data is contained in .met files. GIMBLE.GMGEO2 contains line based data (in ASCII space delimited txt files) relating to magnetic anomaly. The raw data was obtained by a tail mounted Geometrics G-823A magnetometer. No heading correction, cross over correction, continuation or base correction have been applied. Data with significant geomagnetic activity (restricted to 07-Dec-2014 and 23-Dec-2014) were removed. | ["POLYGON((-156 -74.5,-151.4 -74.5,-146.8 -74.5,-142.2 -74.5,-137.6 -74.5,-133 -74.5,-128.4 -74.5,-123.8 -74.5,-119.2 -74.5,-114.6 -74.5,-110 -74.5,-110 -75.05,-110 -75.6,-110 -76.15,-110 -76.7,-110 -77.25,-110 -77.8,-110 -78.35,-110 -78.9,-110 -79.45,-110 -80,-114.6 -80,-119.2 -80,-123.8 -80,-128.4 -80,-133 -80,-137.6 -80,-142.2 -80,-146.8 -80,-151.4 -80,-156 -80,-156 -79.45,-156 -78.9,-156 -78.35,-156 -77.8,-156 -77.25,-156 -76.7,-156 -76.15,-156 -75.6,-156 -75.05,-156 -74.5))"] |
|
Ice thickness and related data over central Marie Byrd Land, West Antarctica (GIMBLE.GR2HI2)
|
1043761 |
2017-02-20 | Young, Duncan A.; Holt, John W.; Blankenship, Donald D. |
Geophysical Investigations of Marie Byrd Land Lithospheric Evolution (GIMBLE) |
GIMBLE was proposed as the first systematic aerogeophysical investigation of the subglacial massif underlying central Marie Byrd Land. Aerogeophysically configured Baslers conducted 14 flights from Byrd Surface Camp and WAIS Divide Camp over two field seasons (January 2013 and December 2014). Airborne ice penetrating radar, gravity and magnetics were the primary datasets collected. Level 2 data represent geolocated geophysical properties (e.g ice thickness), derived from Level 1B measurements (e.g. radar echo delay). Dataset structures are based on those used for Operation Ice Bridge, and are line based data in ASCII space delimited .txt files, with a header delimited by leading "#" characters documenting column assignment and metadata. Georefering data is contained in .met files. GIMBLE.GR2HI2 contains line based data (in ASCII space delimited txt files) relating to ice thickness, bed elevation and bed reflectivity, extracted from 1-D focused radargrams by semiautomatic interpretation. Data was acquired using HiCARS2 in ICP5, and MARFA in ICP6. Some data loss occurred in ICP6 (in particular F10,F11, and F14), limiting the lines that were focused. Data reduction was led by D. Young and S. Kempf. | ["POLYGON((-156 -74.5,-151.4 -74.5,-146.8 -74.5,-142.2 -74.5,-137.6 -74.5,-133 -74.5,-128.4 -74.5,-123.8 -74.5,-119.2 -74.5,-114.6 -74.5,-110 -74.5,-110 -75.05,-110 -75.6,-110 -76.15,-110 -76.7,-110 -77.25,-110 -77.8,-110 -78.35,-110 -78.9,-110 -79.45,-110 -80,-114.6 -80,-119.2 -80,-123.8 -80,-128.4 -80,-133 -80,-137.6 -80,-142.2 -80,-146.8 -80,-151.4 -80,-156 -80,-156 -79.45,-156 -78.9,-156 -78.35,-156 -77.8,-156 -77.25,-156 -76.7,-156 -76.15,-156 -75.6,-156 -75.05,-156 -74.5))"] |
|
Gravity disturbance data over central Marie Byrd Land, West Antarctica (GIMBLE.GGCMG2)
|
1043761 |
2017-02-20 | Young, Duncan A.; Holt, John W.; Blankenship, Donald D. |
Geophysical Investigations of Marie Byrd Land Lithospheric Evolution (GIMBLE) |
GIMBLE was proposed as the first systematic aerogeophysical investigation of the subglacial massif underlying central Marie Byrd Land. Aerogeophysically configured Baslers conducted 14 flights from Byrd Surface Camp and WAIS Divide Camp over two field seasons (January 2013 and December 2014). Airborne ice penetrating radar, gravity and magnetics were the primary datasets collected. Level 2 data represent geolocated geophysical properties (e.g ice thickness), derived from Level 1B measurements (e.g. radar echo delay). Dataset structures are based on those used for Operation Ice Bridge, and are line based data in ASCII space delimited .txt files, with a header delimited by leading "#" characters documenting column assignment and metadata. Georefering data is contained in .met files. GIMBLE.GGCMG2 contains line based data relating to gravity disturbance, processed from raw acceleration and position data by propriety software from Gravimetric Technologies and Novatel. The raw data was obtained a Canadian MicroGravity GT-1A gravimeter in ICP5, and a GT-2A gravimeter in ICP6. Data reduction was led by T. Richter. | ["POLYGON((-156 -74.5,-151.4 -74.5,-146.8 -74.5,-142.2 -74.5,-137.6 -74.5,-133 -74.5,-128.4 -74.5,-123.8 -74.5,-119.2 -74.5,-114.6 -74.5,-110 -74.5,-110 -75.05,-110 -75.6,-110 -76.15,-110 -76.7,-110 -77.25,-110 -77.8,-110 -78.35,-110 -78.9,-110 -79.45,-110 -80,-114.6 -80,-119.2 -80,-123.8 -80,-128.4 -80,-133 -80,-137.6 -80,-142.2 -80,-146.8 -80,-151.4 -80,-156 -80,-156 -79.45,-156 -78.9,-156 -78.35,-156 -77.8,-156 -77.25,-156 -76.7,-156 -76.15,-156 -75.6,-156 -75.05,-156 -74.5))"] |
|
Developing a New Paleoclimate Proxy for Polar and Alpine Glacial Regions Based on Noble Gases
|
1245580 |
2017-01-30 | Castro, M. Clara |
Developing a New Paleoclimate Proxy for Polar and Alpine Glacial Regions Based on Noble Gases |
None | ["POINT(162.3667 -77.7166)", "POINT(163.1833 -77.6767)"] |
|
Video Particle Profiler (VPP) and Digital Inline Holographic Microscopy (DIHM) data from cruise NBP1302
|
1142097 |
2017-01-23 | Bochdansky, Alexander |
Collaborative research: TRacing the fate of Algal Carbon Export in the Ross Sea (TRACERS) |
None | ["POLYGON((163.90952 -67.00006,170.04898 -67.00006,176.18844 -67.00006,182.3279 -67.00006,188.46736 -67.00006,194.60682 -67.00006,200.74628 -67.00006,206.88574 -67.00006,213.0252 -67.00006,219.16466 -67.00006,225.30412 -67.00006,225.30412 -68.15911,225.30412 -69.31816,225.30412 -70.47721,225.30412 -71.63626,225.30412 -72.79531,225.30412 -73.95436,225.30412 -75.11341,225.30412 -76.27246,225.30412 -77.43151,225.30412 -78.59056,219.16466 -78.59056,213.0252 -78.59056,206.88574 -78.59056,200.74628 -78.59056,194.60682 -78.59056,188.46736 -78.59056,182.3279 -78.59056,176.18844 -78.59056,170.04898 -78.59056,163.90952 -78.59056,163.90952 -77.43151,163.90952 -76.27246,163.90952 -75.11341,163.90952 -73.95436,163.90952 -72.79531,163.90952 -71.63626,163.90952 -70.47721,163.90952 -69.31816,163.90952 -68.15911,163.90952 -67.00006))"] |
|
Neogene Paleoecology of the Beardmore Glacier Region
|
0947821 |
2017-01-17 | Ashworth, Allan |
Neogene Paleoecology of the Beardmore Glacier Region |
None | ["POLYGON((166.58793 -85.11733,166.595533 -85.11733,166.603136 -85.11733,166.610739 -85.11733,166.618342 -85.11733,166.625945 -85.11733,166.633548 -85.11733,166.641151 -85.11733,166.648754 -85.11733,166.656357 -85.11733,166.66396 -85.11733,166.66396 -85.117836,166.66396 -85.118342,166.66396 -85.118848,166.66396 -85.119354,166.66396 -85.11986,166.66396 -85.120366,166.66396 -85.120872,166.66396 -85.121378,166.66396 -85.121884,166.66396 -85.12239,166.656357 -85.12239,166.648754 -85.12239,166.641151 -85.12239,166.633548 -85.12239,166.625945 -85.12239,166.618342 -85.12239,166.610739 -85.12239,166.603136 -85.12239,166.595533 -85.12239,166.58793 -85.12239,166.58793 -85.121884,166.58793 -85.121378,166.58793 -85.120872,166.58793 -85.120366,166.58793 -85.11986,166.58793 -85.119354,166.58793 -85.118848,166.58793 -85.118342,166.58793 -85.117836,166.58793 -85.11733))"] |
|
Temperature Reconstruction at the West Antarctic Ice Sheet Divide
|
0539232 |
2017-01-12 | Cuffey, Kurt M. |
Collaborative Research: Physical Properties of the WAIS Divide Deep Core |
This dataset contains the temperature reconstruction at the West Antarctic Ice Sheet (WAIS) Divide reported by Cuffey et al. (2016) in PNAS. Five files contain 1) the primary reconstruction (Eq. 2 of that publication), combining information from borehole temperatures, deuterium isotopic content of ice, and nitrogen-15 content of trapped diatomic nitrogen gas; 2) the primary reconstruction with higher-frequency content restored; 3) the lower limit of the primary reconstruction; 4) the upper limit of the primary reconstruction; and 5) and the primary reconstruction with added perturbations. | ["POINT(-112.083 -79.467)"] |
|
Decoding & Predicting Antarctic Surface Melt Dynamics with Observations, Regional Atmospheric Modeling and GCMs
|
1043580 |
2017-01-10 | Reusch, David |
Collaborative Research: Decoding & Predicting Antarctic Surface Melt Dynamics with Observations, Regional Atmospheric Modeling and GCMs |
None | [] |
|
Airborne radar profiles of the Whillans, Bindschadler, and Kamb Ice Streams
|
0424589 |
2016-12-28 | Paden, John; Hale, Richard |
Center for Remote Sensing of Ice Sheets (CReSIS) |
The Center for Remote Sensing of Ice Sheets (CReSIS) participated in an airborne radar survey using a BT-67 Basler aircraft over the Siple Coast of Antarctica. Five personnel deployed from November 29, 2013 to January 18, 2014 with USAP project# I-189-M. The major objective was to collect fine-resolution radar data with an ultra-wideband MCoRDS4 UHF/VHF radar depth sounder in conjunction with data from two microwave (Ku-band and Snow) radars and a Google Camera. This dataset includes reflection profiles for the three radars and ice surface and ice bottom picks for the radar depth sounder. | ["POLYGON((163.884 -76.567,171.5583 -76.567,179.2326 -76.567,186.9069 -76.567,194.5812 -76.567,202.2555 -76.567,209.9298 -76.567,217.6041 -76.567,225.2784 -76.567,232.9527 -76.567,240.627 -76.567,240.627 -77.3847,240.627 -78.2024,240.627 -79.0201,240.627 -79.8378,240.627 -80.6555,240.627 -81.4732,240.627 -82.2909,240.627 -83.1086,240.627 -83.9263,240.627 -84.744,232.9527 -84.744,225.2784 -84.744,217.6041 -84.744,209.9298 -84.744,202.2555 -84.744,194.5812 -84.744,186.9069 -84.744,179.2326 -84.744,171.5583 -84.744,163.884 -84.744,163.884 -83.9263,163.884 -83.1086,163.884 -82.2909,163.884 -81.4732,163.884 -80.6555,163.884 -79.8378,163.884 -79.0201,163.884 -78.2024,163.884 -77.3847,163.884 -76.567))"] |
|
Cosmogenic Radionuclides in the WAIS Divide Ice Core
|
0636964 |
2016-12-14 | Welten, Kees |
Collaborative Research: Cosmogenic Radionuclides in the Deep WAIS Divide Core |
None | ["POINT(-112.1115 -79.481)"] |
|
Mount Erebus Volcano Observatory: Operations, Science and Outreach (MEVO-OSO)
|
1142083 |
2016-12-03 | Oppenheimer, Clive; Kyle, Philip |
Mount Erebus Volcano Observatory: Operations, Science and Outreach (MEVO-OSO) |
Mt. Erebus is one of only a handful of volcanoes worldwide that have lava lakes with readily observable and nearly continuous Strombolian explosive activity. Erebus is also unique in having a permanent convecting lava lake of anorthoclase phonolite magma. Over the years significant infrastructure has been established at the summit of Mt. Erebus as part of the Mount Erebus Volcano Observatory (MEVO), which serves as a natural laboratory to study a wide range of volcanic processes, especially magma degassing associated with an open convecting magma conduit. The PI proposes to continue operating MEVO for a further five years. The fundamental fundamental research objectives are: to understand diffuse flank degassing by using distributed temperature sensing and gas measurements in ice caves, to understand conduit processes, and to examine the environmental impact of volcanic emissions from Erebus on atmospheric and cryospheric environments. To examine conduit processes the PI will make simultaneous observations with video records, thermal imaging, measurements of gas emission rates and gas compositions, seismic, and infrasound data. An important aspect of Erebus research is the education and training of students. Both graduate and undergraduate students will have the opportunity to work on MEVO data and deploy to the field site. In addition, this proposal will support a middle or high school science teacher for two field seasons. The PI will also continue working with various media organizations and filmmakers. This dataset contains video taken from a series of cameras that were installed at Shackleton's Cairn (-77.525337, 167.157509) looking into the lava lake. This dataset contains all such video taken between 2005 and 2011. Camera downlink depended on power at a relay station at the Cones site. The camera was operational during G-081 field seasons and often for a period of weeks or months thereafter. | ["POINT(167.15334 -77.529724)"] |
|
The Effects of Soluble Impurities on the Flow and Fabric of Polycrystalline Ice
|
1141411 |
2016-11-22 | Baker, Ian |
The Effects of Soluble Impurities on the Flow and Fabric of Polycrystalline Ice |
None | [] |
|
Activation of high-elevation alluvial fans in the Transantarctic Mountains - a proxy for Plio-Pleistocene warmth along East Antarctic ice margins
|
1043554 |
2016-11-09 | Willenbring, Jane |
Collaborative Research: Activation of high-elevation alluvial fans in the Transantarctic Mountains - a proxy for Plio-Pleistocene warmth along East Antarctic ice margins |
The PIs propose to address the question of whether ice surface melting zones developed at high elevations during warm climatic phases in the Transantarctic Mountains. Evidence from sediment cores drilled by the ANDRILL program indicates that open water in the Ross Sea could have been a source of warmth during Pliocene and Pleistocene. The question is whether marine warmth penetrated inland to the ice sheet margins. The glacial record may be ill suited to answer this question, as cold-based glaciers may respond too slowly to register brief warmth. Questions also surround possible orbital controls on regional climate and ice sheet margins. Northern Hemisphere insolation at obliquity and precession timescales is thought to control Antarctic climate through oceanic or atmospheric connections, but new thinking suggests that the duration of Southern Hemisphere summer may be more important. The PIs propose to use high elevation alluvial deposits in the Transantarctic Mountains as a proxy for inland warmth. These relatively young fans, channels, and debris flow levees stand out as visible evidence for the presence of melt water in an otherwise ancient, frozen landscape. Based on initial analyses of an alluvial fan in the Olympus Range, these deposits are sensitive recorders of rare melt events that occur at orbital timescales. For their study they will 1) map alluvial deposits using aerial photography, satellite imagery and GPS assisted field surveys to establish water sources and to quantify parameters effecting melt water production, 2) date stratigraphic sequences within these deposits using OSL, cosmogenic nuclide, and interbedded volcanic ash chronologies, 3) use paired nuclide analyses to estimate exposure and burial times, and rates of deposition and erosion, and 4) use micro and regional scale climate modeling to estimate paleoenvironmental conditions associated with melt events. This study will produce a record of inland melting from sites adjacent to ice sheet margins to help determine controls on regional climate along margins of the East Antarctic Ice Sheet to aid ice sheet and sea level modeling studies. The proposal will support several graduate and undergraduates. A PhD student will be supported on existing funding. The PIs will work with multiple K-12 schools to conduct interviews and webcasts from Antarctica and they will make follow up visits to classrooms after the field season is complete. | ["POINT(161.5 -77.5)"] |
|
WAIS Divide Ice Core Vertical Thin Section Low-resolution Digital Imagery
|
0539578 |
2016-03-07 | Cravens, Eric D. |
Collaborative Research: Physical Properties of the WAIS Divide Deep Core |
This data set consists of a comprehensive, frame-stitched low‐resolution set of digital images of vertical thin sections of the main core (WDC 06A) from WAIS Divide. | ["POINT(-112.085 -79.467)"] |
|
WDC 06A Mean Grain Size Data
|
0539578 |
2016-03-02 | Fitzpatrick, Joan; Cravens, Eric D. |
Collaborative Research: Physical Properties of the WAIS Divide Deep Core |
The data set comprises the mean grain sizes at the sampled depths derived from vertical thin sections and reflects the final WDC 06A timescale. | ["POINT(-112.085 -79.467)"] |
|
Grain Size Full Population Dataset from WDC06A Core
|
0539578 |
2016-02-25 | Fitzpatrick, Joan; Cravens, Eric D. |
Collaborative Research: Physical Properties of the WAIS Divide Deep Core |
This data set contains the complete grain-size data for all analyses conducted on the vertical thin sections of the WAIS Divide Ice Core WDC06A. Complete grain-size distributions are provided here in order to address the shortcomings inherent in using only the mean values. | ["POINT(-112.085 -79.467)"] |
|
King George and Livingston Islands: Velocities and Digital Elevation Model
|
1043649 |
2016-02-17 | Osmanoglu, Batuhan; Hock, Regine |
Contribution of Western Antarctic Peninsula glaciers to sea level rise: Separation of the dynamic and climatic components |
The data contain the time series totals of SAR derived detrended surface velocities from Livingston Island, as well as GeoTiff files generated from intensity tracking of Synthetic Aperture Radar (SAR) imagery. The images include average annual velocity and ice thickness of King George Island, and average annual velocity, ice thickness, and a digital elevation model of Livingston Island. | ["POINT(-57.5 -61.75)", "POINT(-61 -62.75)"] |
|
Decoding & Predicting Antarctic Surface Melt Dynamics with Observations, Regional Atmospheric Modeling and GCMs
|
1043580 |
2016-01-01 | Reusch, David |
Collaborative Research: Decoding & Predicting Antarctic Surface Melt Dynamics with Observations, Regional Atmospheric Modeling and GCMs |
The presence of ice ponds from surface melting of glacial ice can be a significant threshold in assessing the stability of ice sheets, and their overall response to a warming climate. Snow melt has a much reduced albedo, leading to additional seasonal melting from warming insolation. Water run-off not only contributes to the mass loss of ice sheets directly, but meltwater reaching the glacial ice bed may lubricate faster flow of ice sheets towards the ocean. Surficial meltwater may also reach the grounding lines of glacial ice through the wedging open of existing crevasses. The occurrence and amount of meltwater refreeze has even been suggested as a paleo proxy of near-surface atmospheric temperature regimes. Using contemporary remote sensing (microwave) satellite assessment of surface melt occurrence and extent, the predictive skill of regional meteorological models and reanalyses (e.g. WRF, ERA-Interim) to describe the synoptic conditions favourable to surficial melt is to be investigated. Statistical approaches and pattern recognition techniques are argued to provide a context for projecting future ice sheet change. The previous Intergovernmental Panel on Climate Change (IPCC AR4) commented on our lack of understanding of ice-sheet mass balance processes in polar regions and the potential for sea-level change. The IPPC suggested that the forthcoming AR5 efforts highlight regional cryosphere modeling efforts, such as is proposed here. | ["POLYGON((-180 -47,-144 -47,-108 -47,-72 -47,-36 -47,0 -47,36 -47,72 -47,108 -47,144 -47,180 -47,180 -51.3,180 -55.6,180 -59.9,180 -64.2,180 -68.5,180 -72.8,180 -77.1,180 -81.4,180 -85.7,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -85.7,-180 -81.4,-180 -77.1,-180 -72.8,-180 -68.5,-180 -64.2,-180 -59.9,-180 -55.6,-180 -51.3,-180 -47))"] |
|
Measurements of in situ cosmogenic 14C from Taylor Glacier, Antarctica
|
0839031 |
2016-01-01 | Severinghaus, Jeffrey |
Collaborative Research: A "Horizontal Ice Core" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica |
This award supports a project to develop a precise gas-based chronology for an archive of large-volume samples of the ancient atmosphere, which would enable ultra-trace gas measurements that are currently precluded by sample size limitations of ice cores. The intellectual merit of the proposed work is that it will provide a critical test of the 'clathrate hypothesis' that methane clathrates contributed to the two abrupt atmospheric methane concentration increases during the last deglaciation 15 and 11 kyr ago. This approach employs large volumes of ice (>1 ton) to measure carbon-14 on past atmospheric methane across the abrupt events. Carbon-14 is an ideal discriminator of fossil sources of methane to the atmosphere, because most methane sources (e.g., wetlands, termites, biomass burning) are rich in carbon-14, whereas clathrates and other fossil sources are devoid of carbon-14. The proposed work is a logical extension to Taylor Glacier, Antarctica, of an approach pioneered at the margin of the Greenland ice sheet over the past 7 years. The Greenland work found higher-than-expected carbon-14 values, likely due in part to contaminants stemming from the high impurity content of Greenland ice and the interaction of the ice with sediments from the glacier bed. The data also pointed to the possibility of a previously unknown process, in-situ cosmogenic production of carbon-14 methane (radiomethane) in the ice matrix. Antarctic ice in Taylor Glacier is orders of magnitude cleaner than the ice at the Greenland site, and is much colder and less stratigraphically disturbed, offering the potential for a clear resolution of this puzzle and a definitive test of the cosmogenic radiomethane hypothesis. Even if cosmogenic radiomethane in ice is found, it still may be possible to reconstruct atmospheric radiomethane with a correction enabled by a detailed understanding of the process, which will be sought by co-measuring carbon-14 in carbon monoxide and carbon dioxide. The broader impacts of the proposed work are that the clathrate test may shed light on the stability of the clathrate reservoir and its potential for climate feedbacks under human-induced warming. Development of Taylor Glacier as a 'horizontal ice core' would provide a community resource for other researchers. Education of one postdoc, one graduate student, and one undergraduate, would add to human resources. This award has field work in Antarctica. | ["POINT(161.71965 -77.76165)"] |
|
The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive
|
1245821 |
2016-01-01 | Brook, Edward J. |
Collaborative Research: The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive |
This award supports a project to use the Taylor Glacier, Antarctica, ablation zone to collect ice samples for a range of paleoenvironmental studies. A record of carbon-14 of atmospheric methane (14CH4) will be obtained for the last deglaciation and the Early Holocene, together with a supporting record of CH4 stable isotopes. In-situ cosmogenic 14C content and partitioning of 14C between different species (14CH4, C-14 carbon monoxide (14CO) and C-14 carbon dioxide (14CO2)) will be determined with unprecedented precision in ice from the surface down to ~67 m. Further age-mapping of the ablating ice stratigraphy will take place using a combination of CH4, CO2, and delta 18O of oxygen gas and H2O stable isotopes. High precision, high-resolution records of CO2, delta 13C of CO2, nitrous oxide (N2O) and N2O isotopes will be obtained for the last deglaciation and intervals during the last glacial period. The potential of 14CO2 and Krypton-81 (81Kr) as absolute dating tools for glacial ice will be investigated. The intellectual merit of proposed work includes the fact that the response of natural methane sources to continuing global warming is uncertain, and available evidence is insufficient to rule out the possibility of catastrophic releases from large 14C-depleted reservoirs such as CH4 clathrates and permafrost. The proposed paleoatmospheric 14CH4 record will improve our understanding of the possible magnitude and timing of CH4 release from these reservoirs during a large climatic warming. A thorough understanding of in-situ cosmogenic 14C in glacial ice (production rates by different mechanisms and partitioning between species) is currently lacking. Such an understanding will likely enable the use of in-situ 14CO in ice at accumulation sites as a reliable, uncomplicated tracer of the past cosmic ray flux and possibly past solar activity, as well as the use of 14CO2 at both ice accumulation and ice ablation sites as an absolute dating tool. Significant gaps remain in our understanding of the natural carbon cycle, as well as in its responses to global climate change. The proposed high-resolution, high-precision records of delta 13C of CO2 would provide new information on carbon cycle changes both during times of rising CO2 in a warming climate and falling CO2 in a cooling climate. N2O is an important greenhouse gas that increased by ~30% during the last deglaciation. The causes of this increase are still largely uncertain, and the proposed high-precision record of N2O concentration and isotopes would provide further insights into N2O source changes in a warming world. The broader impacts of proposed work include an improvement in our understanding of the response of these greenhouse gas budgets to global warming and inform societally important model projections of future climate change. The continued age-mapping of Taylor Glacier ablation ice will add value to this high-quality, easily accessible archive of natural environmental variability. Establishing 14CO as a robust new tracer for past cosmic ray flux would inform paleoclimate studies and constitute a valuable contribution to the study of the societally important issue of climate change. The proposed work will contribute to the development of new laboratory and field analytical systems. The data from the study will be made available to the scientific community and the broad public through the NSIDC and NOAA Paleoclimatology data centers. 1 graduate student each will be trained at UR, OSU and SIO, and the work will contribute to the training of a postdoc at OSU. 3 UR undergraduates will be involved in fieldwork and research. The work will support a new, junior UR faculty member, Petrenko. All PIs have a strong history of and commitment to scientific outreach in the forms of media interviews, participation in filming of field projects, as well as speaking to schools and the public about their research, and will continue these activities as part of the proposed work. This award has field work in Antarctica. | ["POINT(162.167 -77.733)"] |
|
Glacial-interglacial History of West Antarctic Nunataks and Site Reconnaissance for Subglacial Bedrock Sampling
|
1142162 |
2016-01-01 | Stone, John |
Glacial-interglacial History of West Antarctic Nunataks and Site Reconnaissance for Subglacial Bedrock Sampling |
This award supports a reconnaissance geological and radar-sounding study of promising sites in West Antarctica for a future project to measure cosmogenic nuclides in subglacial bedrock. Field work will take place in the Whitmore Mountains, close to the WAIS divide, and on the Nash and Pirrit Hills, downflow from the divide in the Weddell Sea drainage. At each site geological indicators of higher (and lower) ice levels in the past will be mapped and evidence of subglacial erosion or its absence will be documented. Elevation transects of both glacial erratics and adjacent bedrock samples will be collected to establish the timing of recent deglaciation at the sites and provide a complement to similar measurements on material from depth transects obtained by future subglacial drilling. At each site, bedrock ridges will be traced into the subsurface with closely-spaced ice-penetrating radar surveys, using a combination of instruments and frequencies to obtain the highest possible surface detail. Collectively the results will define prospective sites for subglacial sampling, and maximize the potential information to be obtained from such samples in future studies. The intellectual merit of this project is that measurements of cosmogenic nuclides in subglacial bedrock hold promise for resolving the questions of whether the West Antarctic ice sheet collapsed completely in the past, whether it is prone to repeated large deglaciations, and if so, what is their magnitude and frequency. Such studies will require careful choice of targets, to locate sites where bedrock geology is favorable, cosmogenic nuclide records are likely to have been protected from subglacial erosion, and the local ice-surface response is indicative of large-scale ice sheet behavior. The broader impacts of this work include helping to determine whether subglacial surfaces in West Antarctica were ever exposed to cosmic rays, which will provide unambiguous evidence for or against a smaller ice sheet in the past. This is an important step towards establishing whether the WAIS is vulnerable to collapse in future, and will ultimately help to address uncertainty in forecasting sea level change. The results will also provide ground truth for models of ice-sheet dynamics and long-term ice sheet evolution, and will help researchers use these models to identify paleoclimate conditions responsible for WAIS deglaciation. The education and training of students (both undergraduate and graduate students) will play an important role in the project, which will involve Antarctic fieldwork, technically challenging labwork, data collection and interpretation, and communication of the outcome to scientists and the general public. | ["POLYGON((-104.14 -81.07,-102.24 -81.07,-100.34 -81.07,-98.44 -81.07,-96.54 -81.07,-94.64 -81.07,-92.74 -81.07,-90.84 -81.07,-88.94 -81.07,-87.04 -81.07,-85.14 -81.07,-85.14 -81.207,-85.14 -81.344,-85.14 -81.481,-85.14 -81.618,-85.14 -81.755,-85.14 -81.892,-85.14 -82.029,-85.14 -82.166,-85.14 -82.303,-85.14 -82.44,-87.04 -82.44,-88.94 -82.44,-90.84 -82.44,-92.74 -82.44,-94.64 -82.44,-96.54 -82.44,-98.44 -82.44,-100.34 -82.44,-102.24 -82.44,-104.14 -82.44,-104.14 -82.303,-104.14 -82.166,-104.14 -82.029,-104.14 -81.892,-104.14 -81.755,-104.14 -81.618,-104.14 -81.481,-104.14 -81.344,-104.14 -81.207,-104.14 -81.07))"] |
|
Enhanced Spatial Resolution Surface Melting over the Antarctic Peninsula (1958 - to date) from a Regional Climate Model Validated through Remote Sensing Observations
|
1141973 |
2016-01-01 | Tedesco, Marco |
Enhanced Spatial Resolution Surface Melting over the Antarctic Peninsula (1958 - to date) from a Regional Climate Model Validated through Remote Sensing Observations |
This award supports a project to generate first-time validated enhanced spatial resolution (5-10 km) maps of surface melting over the Antarctic Peninsula for the period 1958 - to date from the outputs of a regional climate model and different downscaling techniques. These maps will be assessed and validated through new high spatial resolution (2.25 km) surface melting maps obtained from the QuikSCAT satellite for the period 1999 - 2009. The intellectual merit of this work is that it would be the first time that the outputs of a regional climate model would be used to study surface melting over Antarctica at such high spatial resolution and the first time that such results are validated by means of an observational tool that has such a large spatial coverage and high spatial resolution. The results generated in this study would also provide a first-time opportunity to study the melt distribution over the Peninsula and its correlation with climate drivers, such as the Southern Annual Mode (SAM) and the El Nino-Southern Oscillation (ENSO) at these unprecedented spatial scales. The enhanced resolution melting maps will also offer a unique opportunity to study melting trends and patterns over specific regions of the Peninsula, such as the Wilkins and the Larsen A and B ice shelves and evaluate whether the extreme melting observed during the recent collapses was unprecedented over the + 50 years. The broader impacts of the project are that it will integrate research and education by fully supporting one female undergrad student, a PhD student and partially supporting a PostDoc. The work will be done at a minority-serving institution and the PhD student who worked on the development of the high-resolution melting data set from QuikSCAT will become the PostDoc who will work on this project. Teaching and learning will be supported by incorporating research results into graduate and undergrad level courses and will be disseminated over the web and through appropriate channels. Results from this project will also benefit the society at large as they will improve our understanding of the links between atmospheric patterns and surface melting and they will contribute to improving estimates of sea level rise from the Antarctica continent. | ["POLYGON((-94.7374 -56.9464,-89.23679 -56.9464,-83.73618 -56.9464,-78.23557 -56.9464,-72.73496 -56.9464,-67.23435 -56.9464,-61.73374 -56.9464,-56.23313 -56.9464,-50.73252 -56.9464,-45.23191 -56.9464,-39.7313 -56.9464,-39.7313 -59.19838,-39.7313 -61.45036,-39.7313 -63.70234,-39.7313 -65.95432,-39.7313 -68.2063,-39.7313 -70.45828,-39.7313 -72.71026,-39.7313 -74.96224,-39.7313 -77.21422,-39.7313 -79.4662,-45.23191 -79.4662,-50.73252 -79.4662,-56.23313 -79.4662,-61.73374 -79.4662,-67.23435 -79.4662,-72.73496 -79.4662,-78.23557 -79.4662,-83.73618 -79.4662,-89.23679 -79.4662,-94.7374 -79.4662,-94.7374 -77.21422,-94.7374 -74.96224,-94.7374 -72.71026,-94.7374 -70.45828,-94.7374 -68.2063,-94.7374 -65.95432,-94.7374 -63.70234,-94.7374 -61.45036,-94.7374 -59.19838,-94.7374 -56.9464))"] |
|
Bromide in Snow in the Sea Ice Zone
|
1043145 |
2016-01-01 | Obbard, Rachel |
Bromide in Snow in the Sea Ice Zone |
A range of chemical and microphysical pathways in polar latitudes, including spring time (tropospheric) ozone depletion, oxidative pathways for mercury, and cloud condensation nuclei (CCN) production leading to changes in the cloud cover and attendant surface energy budgets, have been invoked as being dependent upon the emission of halogen gases formed in sea-ice. The prospects for climate warming induced reductions in sea ice extent causing alteration of these incompletely known surface-atmospheric feedbacks and interactions requires confirmation of mechanistic details in both laboratory studies and field campaigns. One such mechanistic question is how bromine (BrO and Br) enriched snow migrates or is formed through processes in sea-ice, prior to its subsequent mobilization as an aerosol fraction into the atmosphere by strong winds. Once aloft, it may react with ozone and other atmospheric species. Dartmouth researchers will collect snow from the surface of sea ice, from freely blowing snow and in sea-ice cores from Cape Byrd, Ross Sea. A range of spectroscopic, microanalytic and and microstructural approaches will be subsequently used to determine the Br distribution gradients through sea-ice, in order to shed light on how sea-ice first forms and then releases bromine species into the polar atmospheric boundary layer. | ["POLYGON((164.1005 -77.1188,164.36443 -77.1188,164.62836 -77.1188,164.89229 -77.1188,165.15622 -77.1188,165.42015 -77.1188,165.68408 -77.1188,165.94801 -77.1188,166.21194 -77.1188,166.47587 -77.1188,166.7398 -77.1188,166.7398 -77.19337,166.7398 -77.26794,166.7398 -77.34251,166.7398 -77.41708,166.7398 -77.49165,166.7398 -77.56622,166.7398 -77.64079,166.7398 -77.71536,166.7398 -77.78993,166.7398 -77.8645,166.47587 -77.8645,166.21194 -77.8645,165.94801 -77.8645,165.68408 -77.8645,165.42015 -77.8645,165.15622 -77.8645,164.89229 -77.8645,164.62836 -77.8645,164.36443 -77.8645,164.1005 -77.8645,164.1005 -77.78993,164.1005 -77.71536,164.1005 -77.64079,164.1005 -77.56622,164.1005 -77.49165,164.1005 -77.41708,164.1005 -77.34251,164.1005 -77.26794,164.1005 -77.19337,164.1005 -77.1188))"] |
|
Integrative Study of Marine Ice Sheet Stability and Subglacial Life Habitats - Robotic Access to Grounding-zones for Exploration and Science (RAGES)
|
0839107 |
2016-01-01 | Powell, Ross |
Collaborative Research: Integrative Study of Marine Ice Sheet Stability & Subglacial Life Habitats in W Antarctica - Lake & Ice Stream Subglacial Access Research Drilling (LISSARD) |
The RAGES project (Robotic Access to Grounding zones for Exploration and Science) is one of three research components of the WISSARD (Whillans Ice Stream Subglacial Access Research Drilling) integrative initiative that is being funded by the Antarctic Integrated System Science Program of NSF's Office of Polar Programs, Antarctic Division. The overarching scientific objective of WISSARD is to assess the role of water beneath a West Antarctic ice stream in interlinked glaciological, geological, microbiological, geochemical, and oceanographic systems. The RAGES component of WISSARD concentrates on the stability of ice stream grounding zones (GZ), the area where the ice, ocean waters and glacial and sea floor sediment interact. Based on our present limited data and modeling efforts, GZs can be perturbed by (i) internal ice stream dynamics, (ii) filling/draining cycles of subglacial lakes, (iii) increased melting by warming ocean waters, and/or (iv) rates of subglacial sediment (till) supply to the GZ. GZs are seen as high priority targets to investigate due to their unknown contributions to ice sheet stability under future global warming scenarios. The three main science goals for RAGES are to assess: (a) West Antarctic Ice Sheet (WAIS) stability relative to the magnitudes of the four main variables listed above; (b) the degree to which grounding-zone sedimentary systems house important records of past WAIS dynamics; and (c) the importance of microbial activity and subglacial geochemical weathering in supplying nutrients to the WAIS grounding zone, the Ross Ice Shelf (RIS) cavity, and the highly productive Southern Ocean that may ultimately influence global biogeochemical cycles. The RAGES field sampling plan integrates surface geophysical surveys with borehole and subglacial sampling and measurements. The boreholes provide: (1) samples of subglacial water, sediments, and basal ice for biological, geochemical, glaciological, sedimentological, and micropaleontological analyses; (2) measures of subglacial and sub-ice-shelf cavity physical and chemical conditions and their spatial variability; and (3) data on sediment types, state and change of the subglacial water discharge, oceanography, and basal ice at the grounding line and within the nearby sub-ice-shelf cavity. Unique tools to be deployed include a multisensor Sub-Ice ROVer (Remotely Operated Vehicle) and long-term, sub-ice oceanographic moorings. The latest report of the Intergovernmental Panel on Climate Change recognized that the greatest uncertainties in assessing future global sea-level change stem from a poor understanding of ice sheet dynamics and ice sheet vulnerability to oceanic and atmospheric warming. Disintegration of the WAIS (West Antarctic Ice Sheet) alone would contribute 3-5 m to global sea-level rise, making WAIS a focus of scientific concern due to its potential susceptibility to internal or ocean-driven instability. The overall WISSARD project will test the overarching hypothesis that active water drainage connects various subglacial environments and exerts major control on ice sheet flow, geochemistry, metabolic and phylogenetic diversity, and biogeochemical transformations. Societal Relevance: Global warming, melting of ice sheets and consequential sea-level rise are of high societal relevance. Science Resource Development: After a 9-year hiatus WISSARD will provide the US-science community with a renewed capability to access and study sub-ice sheet environments. Developing this technological infrastructure will benefit the broader science community and assets will be accessible for future use through the NSF-OPP drilling contractor. The RAGES project represents a significant advance in polar technology by incorporating the use of complex new instrumentation like the Sub-Ice ROVer and subglacial ocean/lake mooring systems. Furthermore, these projects will pioneer an approach implementing recommendations from the National Research Council committee on Principles of Environmental Stewardship for the Exploration and Study of Subglacial Environments (2007). Education and Outreach (E/O): These activities are grouped into four categories: i) increasing student participation in polar research by fully integrating them in our research programs; ii) introducing new investigators to the polar sciences by incorporating promising young investigators in our programs, iii) promotion of K-12 teaching and learning programs by incorporating various teachers and NSTA programs, and iv) reaching a larger public audience through such venues as popular science magazines, museum based activities and videography and documentary films. In summary, WISSARD will promote scientific exploration of Antarctica by conveying to the public the excitement of accessing and studying what may be some of the last unexplored aquatic environments on Earth, and which represent a potential analogue for extraterrestrial life habitats on Europa and Mars. | ["POLYGON((-163.7 -84,-163.68 -84,-163.66 -84,-163.64 -84,-163.62 -84,-163.6 -84,-163.58 -84,-163.56 -84,-163.54 -84,-163.52 -84,-163.5 -84,-163.5 -84.05,-163.5 -84.1,-163.5 -84.15,-163.5 -84.2,-163.5 -84.25,-163.5 -84.3,-163.5 -84.35,-163.5 -84.4,-163.5 -84.45,-163.5 -84.5,-163.52 -84.5,-163.54 -84.5,-163.56 -84.5,-163.58 -84.5,-163.6 -84.5,-163.62 -84.5,-163.64 -84.5,-163.66 -84.5,-163.68 -84.5,-163.7 -84.5,-163.7 -84.45,-163.7 -84.4,-163.7 -84.35,-163.7 -84.3,-163.7 -84.25,-163.7 -84.2,-163.7 -84.15,-163.7 -84.1,-163.7 -84.05,-163.7 -84))"] |
|
Integrative Study of Marine Ice Sheet Stability and Subglacial Life Habitats in W Antarctica - Lake and Ice Stream Subglacial Access Research Drilling (LISSARD)
|
0839059 |
2016-01-01 | Powell, Ross |
Collaborative Research: Integrative Study of Marine Ice Sheet Stability & Subglacial Life Habitats in W Antarctica - Lake & Ice Stream Subglacial Access Research Drilling (LISSARD) |
The LISSARD project (Lake and Ice Stream Subglacial Access Research Drilling) is one of three research components of the WISSARD integrative initiative (Whillans Ice Stream Subglacial Access Research Drilling) that is being funded by the Antarctic Integrated System Science Program of NSF's Office of Polar Programs, Antarctic Division. The overarching scientific objective of WISSARD is to assess the role of water beneath a West Antarctic ice stream in interlinked glaciological, geological, microbiological, geochemical, and oceanographic systems. The LISSARD component of WISSARD focuses on the role of active subglacial lakes in determining how fast the West Antarctic ice sheet loses mass to the global ocean and influences global sea level changes. The importance of Antarctic subglacial lakes has only been recently recognized, and the lakes have been identified as high priority targets for scientific investigations because of their unknown contributions to ice sheet stability under future global warming scenarios. LISSARD has several primary science goals: A) To provide an observational basis for improving treatments of subglacial hydrological and mechanical processes in models of ice sheet mass balance and stability; B) To reconstruct the past history of ice stream stability by analyzing archives of past basal water and ice flow variability contained in subglacial sediments, porewater, lake water, and basal accreted ice; C) To provide background understanding of subglacial lake environments to benefit RAGES and GBASE (the other two components of the WISSARD project); and D) To synthesize data and concepts developed as part of this project to determine whether subglacial lakes play an important role in (de)stabilizing Antarctic ice sheets. We propose an unprecedented synthesis of approaches to studying ice sheet processes, including: (1) satellite remote sensing, (2) surface geophysics, (3) borehole observations and measurements and, (4) basal and subglacial sampling. The latest report of the Intergovernmental Panel on Climate Change recognized that the greatest uncertainties in assessing future global sea-level change stem from a poor understanding of ice sheet dynamics and ice sheet vulnerability to oceanic and atmospheric warming. Disintegration of the WAIS (West Antarctic Ice Sheet) alone would contribute 3-5 m to global sea-level rise, making WAIS a focus of scientific concern due to its potential susceptibility to internal or ocean-driven instability. The overall WISSARD project will test the overarching hypothesis that active water drainage connects various subglacial environments and exerts major control on ice sheet flow, geochemistry, metabolic and phylogenetic diversity, and biogeochemical transformations. Societal Relevance: Global warming, melting of ice sheets and consequential sea-level rise are of high societal relevance. Science Resource Development: After a 9-year hiatus WISSARD will provide the US-science community with a renewed capability to access and study sub-ice sheet environments. Developing this technological infrastructure will benefit the broader science community and assets will be accessible for future use through the NSF-OPP drilling contractor. Furthermore, these projects will pioneer an approach implementing recommendations from the National Research Council committee on Principles of Environmental Stewardship for the Exploration and Study of Subglacial Environments (2007). Education and Outreach (E/O): These activities are grouped into four categories: i) increasing student participation in polar research by fully integrating them in our research programs; ii) introducing new investigators to the polar sciences by incorporating promising young investigators in our programs, iii) promotion of K-12 teaching and learning programs by incorporating various teachers and NSTA programs, and iv) reaching a larger public audience through such venues as popular science magazines, museum based activities and videography and documentary films. In summary, WISSARD will promote scientific exploration of Antarctica by conveying to the public the excitement of accessing and studying what may be some of the last unexplored aquatic environments on Earth, and which represent a potential analogue for extraterrestrial life habitats on Europa and Mars. | ["POLYGON((-168.7 -82.3,-168.69 -82.3,-168.68 -82.3,-168.67 -82.3,-168.66 -82.3,-168.65 -82.3,-168.64 -82.3,-168.63 -82.3,-168.62 -82.3,-168.61 -82.3,-168.6 -82.3,-168.6 -82.31,-168.6 -82.32,-168.6 -82.33,-168.6 -82.34,-168.6 -82.35,-168.6 -82.36,-168.6 -82.37,-168.6 -82.38,-168.6 -82.39,-168.6 -82.4,-168.61 -82.4,-168.62 -82.4,-168.63 -82.4,-168.64 -82.4,-168.65 -82.4,-168.66 -82.4,-168.67 -82.4,-168.68 -82.4,-168.69 -82.4,-168.7 -82.4,-168.7 -82.39,-168.7 -82.38,-168.7 -82.37,-168.7 -82.36,-168.7 -82.35,-168.7 -82.34,-168.7 -82.33,-168.7 -82.32,-168.7 -82.31,-168.7 -82.3))"] |
|
Long-Term and Interannual Variability of Antarctic Ice Sheet Mass Balance From Satellite Gravimetry and Other Geodetic Measurements
|
1043750 |
2016-01-01 | Chen, Jianli |
Collaborative Research: Long-Term and Interannual Variability of Antarctic Ice Sheet Mass Balance From Satellite Gravimetry and Other Geodetic Measurements |
This award supports a project to improve the estimate of long-term and inter-annual variability of Antarctic ice sheet mass balance at continental, regional, and catchment scales, using satellite gravity measurements from the Gravity Recovery and Climate Experiment (GRACE) and other geodetic measurements. The work will improve the quantification of long-term mass change rates over Antarctica using GRACE gravity data with a longer record and newer generation(s) of products and will develop advanced numerical forward modeling techniques that can accurately correct leakage effects associated with GRACE data processing, and significantly improve spatial resolution of GRACE mass rate estimates over Antarctica. The work will also contribute to a better understanding of crustal uplift rates due to postglacial rebound (PGR) and present day ice load change over Antarctica via PGR models, GPS measurements, and combined analysis of GRACE and ICESat elevation changes. Inter-annual variations of ice mass over Antarctica will be investigated at continental and catchment scales and connections to regional climate change will be studied. The major deliverables from this study will be improved assessments of ice mass balance for the entire Antarctic ice sheet and potential contribution to global mean sea level rise. The work will also provide estimates of regional ice mass change rates over Antarctica, with a focus along the coast in the Amundsen Sea Embayment, the Peninsula in West Antarctica, and in Wilkes Land and Victoria Land in East Antarctica. Estimates of inter-annual ice mass change over Antarctica at various spatial scales, and assessments of uncertainty of GRACE ice rate estimates and PGR models errors over Antarctica will also be made. The intellectual merits of the proposed investigation include 1) providing improved assessments of Antarctic ice mass balance at different temporal and spatial scales with unprecedented accuracy, an important contribution to broad areas of polar science research; 2) combining high accuracy GPS vertical uplift measurements and PGR models to better quantify long-term crust uplift effects that are not distinguishable from ice mass changes by GRACE; and 3) unifying the work of several investigations at the forefront of quantifying ice sheet and glacier mass balance and crustal uplift based on a variety of modern space geodetic observations. The broader impacts include the fact that the project will actively involve student participation and training, through the support of two graduate students. In addition the project will contribute to general education and public outreach (E/PO) activities and the results from this investigation will help inspire future geoscientists and promote public awareness of significant manifestations of climate change. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
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Stable Isotopes of Ice in the Transition and Glacial Sections of the WAIS Divide Deep Ice Core
|
1043167 |
2016-01-01 | White, James; Vaughn, Bruce; Morris, Valerie A.; Jones, Tyler R. |
Collaborative Research: Stable Isotopes of Ice in the Transition and Glacial Sections of the WAIS Divide Deep Ice Core |
This award supports a project to contribute one of the cornerstone analyses, stable isotopes of ice (Delta-D, Delta-O18) to the ongoing West Antarctic Ice Sheet Divide (WAIS) deep ice core. The WAIS Divide drilling project, a multi-institution project to obtain a continuous high resolution ice core record from central West Antarctica, reached a depth of 2560 m in early 2010; it is expected to take one or two more field seasons to reach the ice sheet bed (~3300 m), plus an additional four seasons for borehole logging and other activities including proposed replicate coring. The current proposal requests support to complete analyses on the WAIS Divide core to the base, where the age will be ~100,000 years or more. These analyses will form the basis for the investigation of a number of outstanding questions in climate and glaciology during the last glacial period, focused on the dynamics of the West Antarctic Ice Sheet and the relationship of West Antarctic climate to that of the Northern polar regions, the tropical Pacific, and the rest of the globe, on time scales ranging from years to tens of thousands of years. One new aspect of this work is the growing expertise at the University of Washington in climate modeling with isotope-tracer-enabled general circulation models, which will aid in the interpretation of the data. Another major new aspect is the completion and use of a high-resolution, semi-automated sampling system at the University of Colorado, which will permit the continuous analysis of isotope ratios via laser spectroscopy, at an effective resolution of ~2 cm or less, providing inter-annual time resolution for most of the core. Because continuous flow analyses of stable ice isotopes is a relatively new measurement, we will complement them with parallel measurements, every ~10-20 m, using traditional discrete sampling and analysis by mass spectrometry at the University of Washington. The intellectual merit and the overarching goal of the work are to see Inland WAIS become the reference ice isotope record for West Antarctica. The broader impacts of the work are that the data generated in this project pertain directly to policy-relevant and immediate questions of the stability of the West Antarctic ice sheet, and thus past and future changes in sea level, as well as the nature of climate change in the high southern latitudes. The project will also contribute to the development of modern isotope analysis techniques using laser spectroscopy, with applications well beyond ice cores. The project will involve a graduate student and postdoc who will work with both P.I.s, and spend time at both institutions. Data will be made available rapidly through the Antarctic Glaciological Data Center, for use by other researchers and the public. | ["POINT(-112.08 -79.47)"] |
|
Ice Sheet Model Output, West Antarctic Ice Sheet Deglaciation
|
1043018 |
2015-12-03 | Pollard, David |
Collaborative Research: A New Reconstruction of the Last West Antarctic Ice Sheet Deglaciation in the Ross Sea |
Ice-sheet model output of Antarctic Ice Sheet simulations spanning 30,000 years BP to 5000+ years in the future. | ["POINT(-85 -82)"] |
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Mount Moulton Isotopes and Other Ice Core Data
|
0230316 |
2015-11-24 | Steig, Eric J.; White, James; Popp, Trevor |
Collaborative Research: Refining a 500-kry Climate Record From the Moulton Blue Ice Field in West Antarctica |
This data set consists of water isotope ratios from the Mt. Moulton ice-trench record, as well as data from the Taylor Dome, EPICA Dome C, Talos Dome, Vostok, and EPICA Dronning Maud Land ice cores. | ["POINT(-134.43 -74.04)"] |
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Ultra-High Resolution LA-ICP-MS Results: DO-21 Rapid Warming Event
|
0538657 |
2015-10-27 | Haines, Skylar; Mayewski, Paul A.; Kurbatov, Andrei V. |
Nitrogen and Oxygen Gas Isotopes in the WAIS Divide Ice Core as Constraints on Chronology, Temperature, and Accumulation Rate |
This data set contains the results of Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) performed on an archive of the GISP2 ice core containing the rapid climate warming of Dansgaard-Oeschger Event 21. | ["POINT(-38.5 -76.2)"] |
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Ultra-trace Measurements in the WAIS Divide 06A Ice Core
|
1043780 |
2015-10-27 | Aydin, Murat; Saltzman, Eric |
Carbonyl Sulfide Measurements in the Deep West Antarctic Ice Sheet Divide Ice Core |
These data contain the results of gas chromatography mass spectrometry (GC-MS) analysis of 207 samples from the WAIS Divide 06A ice core. The trace gases found in the 207 samples are ethane (C2H6), propane (C3H8), n-butane (n-C4H10), carbonyl sulfide (COS), carbon disulfide (CS2), methyl chloride (CH3Cl), and methyl bromide (CH3Br). | ["POINT(-112.1 -79.5)"] |
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LA-ICP-MS Results: 3 Siple Dome A Glacial Age Archives
|
1042883 |
2015-10-27 | Haines, Skylar; Mayewski, Paul A.; Kurbatov, Andrei V. |
Roosevelt Island Climate Evolution Project (RICE): US Deep Ice Core Glaciochemistry Contribution (2011- 2014) |
This data set contains the results of Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) performed on an archive of the Siple Dome A ice core containing the rapid climate warming of Dansgaard-Oeschger Event 21. | ["POINT(-148.82 -81.66)"] |
|
Low-res d15N and d18O of O2 in the WAIS Divide 06A Deep Core
|
0538657 |
2015-10-20 | Severinghaus, Jeffrey P. |
Nitrogen and Oxygen Gas Isotopes in the WAIS Divide Ice Core as Constraints on Chronology, Temperature, and Accumulation Rate |
This data set is a low-resolution set of measurements of d15N of N2 and d18O of O2, along with dO2/N and dAr/N2 supporting data, in the WAIS Divide 3405 m long ice core recovered in 2011. Data are distributed via FTP. | ["POINT(-112.08 -79.47)"] |
|
WAIS Divide Ice Core CO2
|
0739766 |
2015-10-06 | Brook, Edward J.; Marcott, Shaun |
Atmospheric Carbon Dioxide and Climate Change: The WAIS Divide Ice Core Record |
The data are measurements of carbon dioxide (CO<sub>2</sub>) from the WAIS Divide Ice Core, WDC06A, Antarctica. | ["POINT(-112.08 -79.46)"] |
|
Roosevelt Island Climate Evolution Ice Core ICP-MS data
|
1042883 |
2015-09-29 | Mayewski, Paul A.; Kurbatov, Andrei V. |
Roosevelt Island Climate Evolution Project (RICE): US Deep Ice Core Glaciochemistry Contribution (2011- 2014) |
This data set includes three Roosevelt Island Climate Evolution (RICE) ice core samples drilled on Roosevelt Island, Ross Ice Shelf, Antarctica. The RICE elements analyzed were: Sr, Cd, Cs, Ba, La, Ce, Pr, Pb, Bi, U, As, Li, I, Al, S, Ca, Ti, V, Cr, Mn, Fe, Co, Na, Mg, Cu, Zn, and K verses depth. | ["POINT(-161.53 -79.39)"] |
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Whillans Ice Stream Stick-slip
|
0944794 |
2015-09-17 | Wiens, Douglas; Winberry, Paul; Anandakrishnan, Sridhar; Alley, Richard |
Collaborative Research: Geophysical Study of Ice Stream Stick-slip Dynamics |
These data contain ice velocity measurements obtained from seismic and GPS recordings during the 2010 and 2011 Antarctic field seasons. | ["POLYGON((-165 -83.75,-164 -83.75,-163 -83.75,-162 -83.75,-161 -83.75,-160 -83.75,-159 -83.75,-158 -83.75,-157 -83.75,-156 -83.75,-155 -83.75,-155 -83.85,-155 -83.95,-155 -84.05,-155 -84.15,-155 -84.25,-155 -84.35,-155 -84.45,-155 -84.55,-155 -84.65,-155 -84.75,-156 -84.75,-157 -84.75,-158 -84.75,-159 -84.75,-160 -84.75,-161 -84.75,-162 -84.75,-163 -84.75,-164 -84.75,-165 -84.75,-165 -84.65,-165 -84.55,-165 -84.45,-165 -84.35,-165 -84.25,-165 -84.15,-165 -84.05,-165 -83.95,-165 -83.85,-165 -83.75))"] |
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Borehole Temperatures at Pine Island Glacier, Antarctica
|
0732730 |
2015-07-31 | Truffer, Martin; Stanton, Timothy |
Collaborative Research; IPY: Ocean-Ice Interaction in the Amundsen Sea sector of West Antarctica |
This data set is a time series of borehole temperatures at different depths from three thermistor strings deployed in three boreholes drilled through the Pine Island Glacier ice shelf, Antarctica. | ["POINT(-100.5 -75.1)"] |
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Continuous, Ultra-high Resolution WAIS-Divide Ice Core Methane Record 9.8-67.2 ka BP
|
0839093 0944552 1142041 1043518 1142166 |
2015-07-23 | McConnell, Joseph; Brook, Edward J.; Rhodes, Rachel |
Collaborative Research: Completing an ultra-high resolution methane record from the WAIS Divide ice core |
This data set contains methane concentrations from a West Antarctic Ice Sheet (WAIS) Divide ice core obtained by an online, continuous technique (Stowasser, et al. 2012). <br></br> IMPORTANT NOTE: The experiment-time-integrated data are made available as a comprehensive archive of WAIS-Divide methane measurements. In the vast majority of cases the 2-yearly spline fit will be the most suitable for your application (Rhodes_Science_2015_WD_CH4_noaa-wdc-paleo (8).xlsx or Rhodes_Science_2015_WD_CH4_noaa-wdc-paleo.txt). <br> </br> For more detailed information on the 2 yearly cubic smoothing spline please refer to references listed, in particular, the Supplementary Material of Rhodes et al. (2015). | ["POINT(-112.05 -79.28)"] |
|
Inverted Basal Shear Stress of Antarctic and Greenland Ice Streams and Glaciers
|
0934534 |
2015-07-07 | Sergienko, Olga |
COLLABORATIVE RESEARCH: Enabling ice sheet sensitivity and stability analysis with a large-scale higher-order ice sheet model's adjoint to support sea level change assessment |
This data set includes basal shear distributions inferred from surface observations - surface ice velocities (Joughin et al., 2010, Rignot et al., 2011), bed and surface elevations (Fretwell et al., 2013) under ten selected locations in Greenland and Antarctica. In Greenland, the locations were: 79° North and Zachariae Glaciers, Jakobshan Isbrae, North East Greenland Ice Stream, Petermann Glacier. The Antarctica locations were Bindschadler Ice Stream, Lambert Ice Stream, MacAyeal Ice Stream, Pine Island Glacier, Thwaites Glacier, and an unnamed location around ~40° E 84° S. | ["POLYGON((-150 -75,-129 -75,-108 -75,-87 -75,-66 -75,-45 -75,-24 -75,-3 -75,18 -75,39 -75,60 -75,60 -76.5,60 -78,60 -79.5,60 -81,60 -82.5,60 -84,60 -85.5,60 -87,60 -88.5,60 -90,39 -90,18 -90,-3 -90,-24 -90,-45 -90,-66 -90,-87 -90,-108 -90,-129 -90,-150 -90,-150 -88.5,-150 -87,-150 -85.5,-150 -84,-150 -82.5,-150 -81,-150 -79.5,-150 -78,-150 -76.5,-150 -75))", "POLYGON((-75 84,-69.5 84,-64 84,-58.5 84,-53 84,-47.5 84,-42 84,-36.5 84,-31 84,-25.5 84,-20 84,-20 81.6,-20 79.2,-20 76.8,-20 74.4,-20 72,-20 69.6,-20 67.2,-20 64.8,-20 62.4,-20 60,-25.5 60,-31 60,-36.5 60,-42 60,-47.5 60,-53 60,-58.5 60,-64 60,-69.5 60,-75 60,-75 62.4,-75 64.8,-75 67.2,-75 69.6,-75 72,-75 74.4,-75 76.8,-75 79.2,-75 81.6,-75 84))"] |
|
WAIS Divide Microparticle Concentration and Size Distribution, 0-2400 ka
|
0636740 |
2015-06-29 | Koffman, Bess; Kreutz, Karl |
Collaborative Research: Microparticle/tephra analysis of the WAIS Divide ice core |
This data set includes raw dust microparticle data for the WAIS Divide deep core, WDC06A, from the surface to 577 m. Data were collected in 2010 using a Klotz Abakus laser particle counter connected to a continuous ice core melter system at the University of Maine (Breton et al., 2012). | ["POINT(-112.5 -79.28)"] |
|
Surface Temperature Reconstruction from Borehole Temperature Measurement in WDC05A
|
0440701 |
2015-06-08 | Severinghaus, Jeffrey P.; Orsi, Anais J. |
Collaborative Research: Gases in Firn Air and Shallow Ice at the Proposed WAIS Divide Drilling Site |
This data set shows the modeled surface temperature reconstruction from an inversion of the 300 m WDC05A borehole at the West Antarctic Divide Ice core site. | ["POINT(-112.125 -79.463)"] |
|
Borehole Temperature Measurement in WDC05A in January 2008 and January 2009
|
0538657 |
2015-06-08 | Severinghaus, Jeffrey P.; Orsi, Anais J. |
Nitrogen and Oxygen Gas Isotopes in the WAIS Divide Ice Core as Constraints on Chronology, Temperature, and Accumulation Rate |
This data set includes borehole temperature measurements performed in January 2008 and January 2009 at the West Antarctic Ice sheet divide from the 300 m hole WDC05A. | ["POINT(-112.125 -79.463)"] |
|
Snowpit Chemistry - Methods Comparison, WAIS Divide, Antarctica
|
0636740 |
2015-06-01 | Kreutz, Karl |
Collaborative Research: Microparticle/tephra analysis of the WAIS Divide ice core |
Measurements of a suite of trace elements in snow pit samples from WAIS Divide, Antarctica. | ["POINT(-112.05 -79.28)"] |
|
Fiber-Optic Distributed Temperature Sensing at Windless Bight
|
1043154 1043395 1043217 |
2015-05-05 | Tyler, Scott W.; Holland, D. M.; Zagorodnov, Victor |
Collaborative Research: Application of Distributed Temperature Sensors (DTS) for Antarctic Ice Shelves and Cavities |
Fiber-optic equipped moorings for Raman backscatter Distributed Temperature Sensing (DTS) were installed at Windless Bight, Antarctica in November 2011. Continuous-in-space measurements of temperature were recorded every meter along the mooring. | ["POINT(167.5333 -77.76667)"] |
|
WAIS Divide WDC06A Oxygen Isotope Record
|
1043092 |
2015-04-28 | Steig, Eric J. |
Collaborative Research: Stable Isotopes of Ice in the Transition and Glacial Sections of the WAIS Divide Deep Ice Core |
This data set contains complete low resolution (0.25 to 100 cm) oxygen isotope data from the WAIS Divide Ice Core WDC06A, 0 to 3404.7 m depth. Also included is the WDC2014 timescale. | ["POINT(-112.05 -79.28)"] |
|
Reedy Glacier Exposure Ages, Antarctica
|
0229314 |
2015-03-30 | Stone, John |
Collaborative Research: Late Quaternary History of Reedy Glacier |
This data set contains site, sample, and analytical data from which to calculate cosmogenic nuclide-based exposure ages for glacial deposits adjacent to Reedy Glacier, Antarctica. The data are formatted as input for the CRONUS online exposure-age calculator (http://www.hess.ess.edu/), which determines the exposure age from the cosmogenic Beryllium-10 and Aluminum-26 production rates. | ["POLYGON((-136.32 -85.38,-135.136 -85.38,-133.952 -85.38,-132.768 -85.38,-131.584 -85.38,-130.4 -85.38,-129.216 -85.38,-128.032 -85.38,-126.848 -85.38,-125.664 -85.38,-124.48 -85.38,-124.48 -85.493,-124.48 -85.606,-124.48 -85.719,-124.48 -85.832,-124.48 -85.945,-124.48 -86.058,-124.48 -86.171,-124.48 -86.284,-124.48 -86.397,-124.48 -86.51,-125.664 -86.51,-126.848 -86.51,-128.032 -86.51,-129.216 -86.51,-130.4 -86.51,-131.584 -86.51,-132.768 -86.51,-133.952 -86.51,-135.136 -86.51,-136.32 -86.51,-136.32 -86.397,-136.32 -86.284,-136.32 -86.171,-136.32 -86.058,-136.32 -85.945,-136.32 -85.832,-136.32 -85.719,-136.32 -85.606,-136.32 -85.493,-136.32 -85.38))"] |
|
Average Annual Layer Thickness of the WAIS Divide Ice Core from Visual Stratigraphy
|
1043313 |
2015-03-11 | Spencer, Matthew |
Collaborative Research: Continued Study of Physical Properties of the WAIS Divide Deep Core |
This data set includes ~50 m averaged annual layer thicknesses down to 3403 m depth at the West Antarctic Ice Sheet (WAIS) Divide ice core as observed visually using diffuse transmitted light opposite a planed surface in a light-shielded booth in the core-processing line at the National Ice Core Lab in Denver, CO. | ["POINT(-112.0865 -79.4676)"] |
|
Firn Permeability and Density at WAIS Divide
|
0944078 |
2015-03-11 | Albert, Mary R. |
Firn Metamorphism: Microstructure and Physical Properties |
This data set contains laboratory measurements of the density and permeability made from firn cores from the lock-in zone through pore close-off at the WAIS Divide and Megadunes sites. | ["POINT(-112.12317 -79.463)", "POINT(124.48796 -80.77914)"] |
|
C-axis Fabric from Physical Properties Samples of the WAIS Divide Ice Core
|
1043528 |
2015-03-10 | Voigt, Donald E.; Alley, Richard; Fitzpatrick, Joan |
Collaborative Research: Continued Study of Physical Properties of the WAIS Divide Deep Core |
This data set contains c-axis fabric measurements and grain area from the physical properties samples taken from the main West Antarctic Ice Sheet (WAIS) Divide ice core, WDC06A , Antarctica. | ["POINT(-112.085 -79.467)"] |
|
Annual Satellite Era Accumulation Patterns Over WAIS Divide: A Study Using Shallow Ice Cores, Near-Surface Radars and Satellites
|
0944653 |
2015-01-01 | Forster, Richard |
Collaborative Research: Annual satellite era accumulation patterns over WAIS Divide: A study using shallow ice cores, near-surface radars and satellites |
This award supports a project to broaden the knowledge of annual accumulation patterns over the West Antarctic Ice Sheet by processing existing near-surface radar data taken on the US ITASE traverse in 2000 and by gathering and validating new ultra/super-high-frequency (UHF) radar images of near surface layers (to depths of ~15 m), expanding abilities to monitor recent annual accumulation patterns from point source ice cores to radar lines. Shallow (15 m) ice cores will be collected in conjunction with UHF radar images to confirm that radar echoed returns correspond with annual layers, and/or sub-annual density changes in the near-surface snow, as determined from ice core stable isotopes. This project will additionally improve accumulation monitoring from space-borne instruments by comparing the spatial-radar-derived-annual accumulation time series to the passive microwave time series dating back over 3 decades and covering most of Antarctica. The intellectual merit of this project is that mapping the spatial and temporal variations in accumulation rates over the Antarctic ice sheet is essential for understanding ice sheet responses to climate forcing. Antarctic precipitation rate is projected to increase up to 20% in the coming century from the predicted warming. Accumulation is a key component for determining ice sheet mass balance and, hence, sea level rise, yet our ability to measure annual accumulation variability over the past 5 decades (satellite era) is mostly limited to point-source ice cores. Developing a radar and ice core derived annual accumulation dataset will provide validation data for space-born remote sensing algorithms, climate models and, additionally, establish accumulation trends. The broader impacts of the project are that it will advance discovery and understanding within the climatology, glaciology and remote sensing communities by verifying the use of UHF radars to monitor annual layers as determined by visual, chemical and isotopic analysis from corresponding shallow ice cores and will provide a dataset of annual to near-annual accumulation measurements over the past ~5 decades across WAIS divide from existing radar data and proposed radar data. By determining if temporal changes in the passive microwave signal are correlated with temporal changes in accumulation will help assess the utility of passive microwave remote sensing to monitor accumulation rates over ice sheets for future decades. The project will promote teaching, training and learning, and increase representation of underrepresented groups by becoming involved in the NASA History of Winter project and Thermochron Mission and by providing K-12 teachers with training to monitor snow accumulation and temperature here in the US, linking polar research to the student's backyard. The project will train both undergraduate and graduate students in polar research and will encouraging young investigators to become involved in careers in science. In particular, two REU students will participate in original research projects as part of this larger project, from development of a hypothesis to presentation and publication of the results. The support of a new, young woman scientist will help to increase gender diversity in polar research. | ["POLYGON((-119.4 -78.1,-118.46 -78.1,-117.52 -78.1,-116.58 -78.1,-115.64 -78.1,-114.7 -78.1,-113.76 -78.1,-112.82 -78.1,-111.88 -78.1,-110.94 -78.1,-110 -78.1,-110 -78.29,-110 -78.48,-110 -78.67,-110 -78.86,-110 -79.05,-110 -79.24,-110 -79.43,-110 -79.62,-110 -79.81,-110 -80,-110.94 -80,-111.88 -80,-112.82 -80,-113.76 -80,-114.7 -80,-115.64 -80,-116.58 -80,-117.52 -80,-118.46 -80,-119.4 -80,-119.4 -79.81,-119.4 -79.62,-119.4 -79.43,-119.4 -79.24,-119.4 -79.05,-119.4 -78.86,-119.4 -78.67,-119.4 -78.48,-119.4 -78.29,-119.4 -78.1))"] |
|
Optical Fabric and Fiber Logging of Glacial Ice (1142010)
|
1142010 |
2015-01-01 | Talghader, Joseph |
Optical Fabric and Fiber Logging of Glacial Ice |
This award supports a project to combine the expertise of both glaciologists and optical engineers to develop polarization- preserving optical scattering techniques for borehole tools to identify changes in high-resolution crystal structure (fabric) and dust content of glacial ice. The intellectual merit of this work is that the fabric and impurity content of the ice contain details on climate, volcanic activity and ice flow history. Such fabric measurements are currently taken by slicing an ice core into sections after it has started to depressurize which is an extremely time-intensive process that damages the core and does not always preserve the properties of ice in its in-situ state. In addition the ice core usually must be consumed in order to measure the components of the dust. The fabric measurements of this study utilize the concept that singly-scattered light in ice preserves most of its polarization when it is backscattered once from bubbles or dust; therefore, changes to the polarization of singly-backscattered light must originate with the birefringence. Measurements based on this concept will enable this program to obtain continuous records of fabric and correlate them to chronology and dust content. The project will also develop advanced borehole instruments to replace current logging tools, which require optical sources, detectors and power cables to be submerged in borehole fluid and lowered into the ice sheet at temperatures of -50oC. The use of telecommunications fiber will allow all sources and detectors to remain at the surface and enable low-noise signal processing techniques such as lock-in amplification that increase signal integrity and reduce needed power. Further, fiber logging systems would be much smaller and more flexible than current tools and capable of navigating most boreholes without a heavy winch. In order to assess fabric in situ and test fiber-optic borehole tools, field measurements will be made at WAIS Divide and a deep log will also be made at Siple Dome, both in West Antarctica. If successful, the broader impacts of the proposed research would include the development of new analytical methods and lightweight logging tools for ice drilling research that can operate in boreholes drilled in ice. Eventually the work could result in the development of better prehistoric records of glacier flow, atmospheric particulates, precipitation, and climate forcing. The project encompasses a broad base of theoretical, experimental, and design work, which makes it ideal for training graduate students and advanced undergraduates. Collaboration with schools and classroom teachers will help bring aspects of optics, climate, and polar science to an existing Middle School curriculum. | ["POLYGON((-148.81 -79.42,-145.111 -79.42,-141.412 -79.42,-137.713 -79.42,-134.014 -79.42,-130.315 -79.42,-126.616 -79.42,-122.917 -79.42,-119.218 -79.42,-115.519 -79.42,-111.82 -79.42,-111.82 -79.643,-111.82 -79.866,-111.82 -80.089,-111.82 -80.312,-111.82 -80.535,-111.82 -80.758,-111.82 -80.981,-111.82 -81.204,-111.82 -81.427,-111.82 -81.65,-115.519 -81.65,-119.218 -81.65,-122.917 -81.65,-126.616 -81.65,-130.315 -81.65,-134.014 -81.65,-137.713 -81.65,-141.412 -81.65,-145.111 -81.65,-148.81 -81.65,-148.81 -81.427,-148.81 -81.204,-148.81 -80.981,-148.81 -80.758,-148.81 -80.535,-148.81 -80.312,-148.81 -80.089,-148.81 -79.866,-148.81 -79.643,-148.81 -79.42))"] |
|
Magnetostratigraphy of Cretaceous Sediments in the James Ross Island Basin, Antarctica
|
1303896 |
2015-01-01 | Kirschvink, Joseph |
Magnetostratigraphy of Cretaceous Sediments in the James Ross Island Basin, Antarctica |
The PI will collect samples to extend the magneto-stratigraphic record of late Cretaceous sediments of the James Ross Basin, Antarctica. RAPID support will allow him to take advantage of an invitation from the Instituto Antartico Argentino (IAA) to participate on an excursion to James Ross Island in the Antarctic Peninsula. The PI hopes to collect samples that will refine the position of several geomagnetic reversals between the end of the Cretaceous long normal Chron and the lower portion of Chron 31R. The Brandy Bay locality targeted by this expedition is the best place in the basin for calibrating the biostratigraphic position of the top of the Cretaceous Long Normal Chron, which is one of the most reliable correlation horizons in the entire Geological Time Scale. The top of the Cretaceous long normal Chron is not properly correlated to southern hemisphere biostratigraphy. Locating this event will be a major addition to understanding geological time. This expedition will provide opportunities for an undergraduate student. This project is based on a productive collaboration with an Argentine scientist. | ["POLYGON((-57 -63,-56.9 -63,-56.8 -63,-56.7 -63,-56.6 -63,-56.5 -63,-56.4 -63,-56.3 -63,-56.2 -63,-56.1 -63,-56 -63,-56 -63.2,-56 -63.4,-56 -63.6,-56 -63.8,-56 -64,-56 -64.2,-56 -64.4,-56 -64.6,-56 -64.8,-56 -65,-56.1 -65,-56.2 -65,-56.3 -65,-56.4 -65,-56.5 -65,-56.6 -65,-56.7 -65,-56.8 -65,-56.9 -65,-57 -65,-57 -64.8,-57 -64.6,-57 -64.4,-57 -64.2,-57 -64,-57 -63.8,-57 -63.6,-57 -63.4,-57 -63.2,-57 -63))"] |
|
Ocean-Ice-Atmosphere Interactions in the Terra Nova Bay Polynya, Antarctica
|
1043657 |
2015-01-01 | Cassano, John; Palo, Scott |
Collaborative Research: Ocean-Ice-Atmosphere Interactions in the Terra Nova Bay Polynya, Antarctica |
Antarctic coastal polynas are, at the same time, sea-ice free sites and 'sea-ice factories'. They are open water surface locations where water mass transformation and densification occurs, and where atmospheric exchanges with the deep ocean circulation are established. Various models of the formation and persistence of these productive and diverse ocean ecosystems are hampered by the relative lack of in situ meteorological and physical oceanographic observations, especially during the inhospitable conditions of their formation and activity during the polar night. Characterization of the lower atmosphere properties, air-sea surface heat fluxes and corresponding ocean hydrographic profiles of Antarctic polynyas, especially during strong wind events, is sought for a more detailed understanding of the role of polynyas in the production of latent-heat type sea ice and the formation, through sea ice brine rejection, of dense ocean bottom waters. A key technological innovation in this work continues to be the use of instrumented unmanned aircraft systems (UAS), to enable the persistent and safe observation of the interaction of light and strong katabatic wind fields, and mesocale cyclones in the Terra Nova Bay (Victoria Land, Antarctica) polynya waters during late winter and early summer time frames. | ["POLYGON((163 -74.5,163.9 -74.5,164.8 -74.5,165.7 -74.5,166.6 -74.5,167.5 -74.5,168.4 -74.5,169.3 -74.5,170.2 -74.5,171.1 -74.5,172 -74.5,172 -74.9,172 -75.3,172 -75.7,172 -76.1,172 -76.5,172 -76.9,172 -77.3,172 -77.7,172 -78.1,172 -78.5,171.1 -78.5,170.2 -78.5,169.3 -78.5,168.4 -78.5,167.5 -78.5,166.6 -78.5,165.7 -78.5,164.8 -78.5,163.9 -78.5,163 -78.5,163 -78.1,163 -77.7,163 -77.3,163 -76.9,163 -76.5,163 -76.1,163 -75.7,163 -75.3,163 -74.9,163 -74.5))"] |
|
Cryptic Hydrology of the McMurdo Dry Valleys: Water Track Contributions to Water and Geochemical Budgets in Taylor Valley, Antarctica
|
1343649 |
2015-01-01 | Levy, Joseph |
Cryptic Hydrology of the McMurdo Dry Valleys: Water Track Contributions to Water and Geochemical Budgets in Taylor Valley, Antarctica |
The PIs propose to quantify the hillslope water, solute, and carbon budgets for Taylor Valley in the McMurdo Dry Valleys, using water tracks to investigate near-surface geological processes and challenge the paradigm that shallow groundwater is minimal or non-exixtant. Water tracks are linear zones of high soil moisture that route shallow groundwater downslope in permafrost dominated soils. Four hypotheses will be tested: 1) water tracks are important pathways for water and solute transport; 2) water tracks transport more dissolved silica than streams in Taylor Valley indicating they are the primary site of chemical weathering for cold desert soils and bedrock; 3) water tracks that drain highland terrains are dominated by humidity-separated brines while water tracks that drain lowland terrains are dominated by marine aerosols; 4) water tracks are the sites of the highest terrestrial soil carbon concentrations and the strongest CO2 fluxes in Taylor Valley and their carbon content increases with soil age, while carbon flux decreases with age. To test these hypotheses the PIs will carry out a suite of field measurements supported by modeling and remote sensing. They will install shallow permafrost wells in water tracks that span the range of geological, climatological, and topographic conditions in Taylor Valley. Multifrequency electromagnetic induction sounding of the upper ~1 m of the permafrost will create the first comprehensive map of soil moisture in Taylor Valley, and will permit direct quantification of water track discharge across the valley. The carbon contents of water track soils will be measured and linked to global carbon dynamics. Non-science majors at Oregon State University will be integrated into the proposed research through a new Global Environmental Change course focusing on the scientific method in Antarctica. Three undergraduate students, members of underrepresented minorities, will be entrained in the research, will contribute to all aspects of field and laboratory science, and will present results at national meetings. | ["POLYGON((162.852 -77.6111,162.9893 -77.6111,163.1266 -77.6111,163.2639 -77.6111,163.4012 -77.6111,163.5385 -77.6111,163.6758 -77.6111,163.8131 -77.6111,163.9504 -77.6111,164.0877 -77.6111,164.225 -77.6111,164.225 -77.65331,164.225 -77.69552,164.225 -77.73773,164.225 -77.77994,164.225 -77.82215,164.225 -77.86436,164.225 -77.90657,164.225 -77.94878,164.225 -77.99099,164.225 -78.0332,164.0877 -78.0332,163.9504 -78.0332,163.8131 -78.0332,163.6758 -78.0332,163.5385 -78.0332,163.4012 -78.0332,163.2639 -78.0332,163.1266 -78.0332,162.9893 -78.0332,162.852 -78.0332,162.852 -77.99099,162.852 -77.94878,162.852 -77.90657,162.852 -77.86436,162.852 -77.82215,162.852 -77.77994,162.852 -77.73773,162.852 -77.69552,162.852 -77.65331,162.852 -77.6111))"] |
|
A New Reconstruction of the Last West Antarctic Ice Sheet Deglaciation in the Ross Sea
|
1043485 |
2015-01-01 | Kurz, Mark D.; Curtice, Josh |
Collaborative Research: A New Reconstruction of the Last West Antarctic Ice Sheet Deglaciation in the Ross Sea |
This award supports a project to develop a better understanding of the response of the WAIS to climate change. The timing of the last deglaciation of the western Ross Sea will be improved using in situ terrestrial cosmogenic nuclides (3He, 10Be, 14C, 26Al, 36Cl) to date glacial erratics at key areas and elevations along the western Ross Sea coast. A state-of-the art ice sheet-shelf model will be used to identify mechanisms of deglaciation of the Ross Sea sector of WAIS. The model results and forcing will be compared with observations including the new cosmogenic data proposed here, with the aim of better determining and understanding the history and causes of WAIS deglaciation in the Ross Sea. There is considerable uncertainty, however, in the history of grounding line retreat from its last glacial maximum position, and virtually nothing is known about the timing of ice- surface lowering prior to ~10,000 years ago. Given these uncertainties, we are currently unable to assess one of the most important questions regarding the last deglaciation of the global ice sheets, namely as to whether the Ross Sea sector of WAIS contributed significantly to meltwater pulse 1A (MWP-1A), an extraordinarily rapid (~500-year duration) episode of ~20 m sea-level rise that occurred ~14,500 years ago. The intellectual merit of this project is that recent observations of startling changes at the margins of the Greenland and Antarctic ice sheets indicate that dynamic responses to warming may play a much greater role in the future mass balance of ice sheets than considered in current numerical projections of sea level rise. The broader impacts of this work are that it has direct societal relevance to developing an improved understanding of the response of the West Antarctic ice sheet to current and possible future environmental changes including the sea-level response to glacier and ice sheet melting due to global warming. The PI will communicate results from this project to a variety of audiences through the publication of peer-reviewed papers and by giving talks to public audiences. Finally the project will support a graduate student and undergraduate students in all phases of field-work, laboratory work and data interpretation. | ["POLYGON((163.4 -77.47989,163.9848 -77.47989,164.5696 -77.47989,165.1544 -77.47989,165.7392 -77.47989,166.324 -77.47989,166.9088 -77.47989,167.4936 -77.47989,168.0784 -77.47989,168.6632 -77.47989,169.248 -77.47989,169.248 -77.565701,169.248 -77.651512,169.248 -77.737323,169.248 -77.823134,169.248 -77.908945,169.248 -77.994756,169.248 -78.080567,169.248 -78.166378,169.248 -78.252189,169.248 -78.338,168.6632 -78.338,168.0784 -78.338,167.4936 -78.338,166.9088 -78.338,166.324 -78.338,165.7392 -78.338,165.1544 -78.338,164.5696 -78.338,163.9848 -78.338,163.4 -78.338,163.4 -78.252189,163.4 -78.166378,163.4 -78.080567,163.4 -77.994756,163.4 -77.908945,163.4 -77.823134,163.4 -77.737323,163.4 -77.651512,163.4 -77.565701,163.4 -77.47989))"] |
|
Molecular Level Characterization of Dissolved Organic Carbon and Microbial Diversity in the WAIS Divide Replicate Core
|
1141936 |
2015-01-01 | Foreman, Christine |
Molecular Level Characterization of Dissolved Organic Carbon and Microbial Diversity in the WAIS Divide Replicate Core |
This award supports a detailed, molecular level characterization of dissolved organic carbon and microbes in Antarctic ice cores. Using the most modern biological (genomic), geochemical techniques, and advanced chemical instrumentation researchers will 1) optimize protocols for collecting, extracting and amplifying DNA from deep ice cores suitable for use in next generation pyrosequencing; 2) determine the microbial diversity within the ice core; and 3) obtain and analyze detailed molecular characterizations of the carbon in the ice by ultrahigh resolution Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR-MS). With this pilot study investigators will be able to quantify the amount of material (microbial biomass and carbon) required to perform these characterizations, which is needed to inform future ice coring projects. The ultimate goal will be to develop protocols that maximize the yield, while minimizing the amount of ice required. The broader impacts include education and outreach at both the local and national levels. As a faculty mentor with the American Indian Research Opportunities and BRIDGES programs at Montana State University, Foreman will serve as a mentor to a Native American student in the lab during the summer months. Susan Kelly is an Education and Outreach Coordinator with a MS degree in Geology and over 10 years of experience in science outreach. She will coordinate efforts for comprehensive educational collaboration with the Hardin School District on the Crow Indian Reservation in South-central Montana. | ["POINT(112.086 79.468)"] |
|
Measurements of Trapped Air from Mullins Valley, Dry Valleys, Antarctica
|
0636731 |
2014-11-26 | Bender, Michael; Yau, Audrey M. |
Collaborative Research: Dating and Paleoenvironmental Studies on Ancient Ice in the Dry Valleys, Antarctica |
These data describe the analyses of the elemental and isotopic composition of O2, N2, and Ar and total air content made on the trapped air from three shallow ice cores (<34m depth) collected during the 2009 field campaign to Mullins Valley of the Dry Valleys, Antarctica. | ["POINT(160.35 -77.87)"] |
|
Synthesis of Thwaites Glacier Dynamics: Diagnostic and Prognostic Sensitivity Studies of a West Antarctic Outlet System
|
0758274 0632198 0732844 |
2014-11-03 | Parizek, Byron R.; Blankenship, Donald D.; Dupont, Todd K.; Holt, John W. |
Collaborative Research: Synthesis of Thwaites Glacier Dynamics: Diagnostic and Prognostic Sensitivity Studies of a West Antarctic Outlet System IPY: Flow Dynamics of the Amundsen Sea Glaciers: Thwaites and Pine Island. |
This data set consists of experimental output from a higher-order finite-element model that was utilized in conjunction with existing data sets to isolate essential physical processes affecting Thwaites Glacier (TG) in the Amundsen Sea Embayment (ASE) of West Antarctica. | ["POLYGON((-110.06 -74.05,-109.582 -74.05,-109.104 -74.05,-108.626 -74.05,-108.148 -74.05,-107.67 -74.05,-107.192 -74.05,-106.714 -74.05,-106.236 -74.05,-105.758 -74.05,-105.28 -74.05,-105.28 -74.31,-105.28 -74.57,-105.28 -74.83,-105.28 -75.09,-105.28 -75.35,-105.28 -75.61,-105.28 -75.87,-105.28 -76.13,-105.28 -76.39,-105.28 -76.65,-105.758 -76.65,-106.236 -76.65,-106.714 -76.65,-107.192 -76.65,-107.67 -76.65,-108.148 -76.65,-108.626 -76.65,-109.104 -76.65,-109.582 -76.65,-110.06 -76.65,-110.06 -76.39,-110.06 -76.13,-110.06 -75.87,-110.06 -75.61,-110.06 -75.35,-110.06 -75.09,-110.06 -74.83,-110.06 -74.57,-110.06 -74.31,-110.06 -74.05))"] |
|
Radar Studies of Subglacial Lake Whillans and the Whillans Ice Stream Grounding Zone
|
0838855 0838854 |
2014-10-30 | Jacobel, Robert |
Collaborative Research: Integrative Study of Marine Ice Sheet Stability & Subglacial Life Habitats in W Antarctica - Lake & Ice Stream Subglacial Access Research Drilling (LISSARD) |
This data set includes ground-based, gridded, ice-penetrating radar thickness and basal reflection power, along with GPS coordinates, for two areas of Whillans Ice Stream: Subglacial Lake Whillans and the Whillans Ice Stream grounding zone. | ["POLYGON((-164 -84.2,-163 -84.2,-162 -84.2,-161 -84.2,-160 -84.2,-159 -84.2,-158 -84.2,-157 -84.2,-156 -84.2,-155 -84.2,-154 -84.2,-154 -84.21,-154 -84.22,-154 -84.23,-154 -84.24,-154 -84.25,-154 -84.26,-154 -84.27,-154 -84.28,-154 -84.29,-154 -84.3,-155 -84.3,-156 -84.3,-157 -84.3,-158 -84.3,-159 -84.3,-160 -84.3,-161 -84.3,-162 -84.3,-163 -84.3,-164 -84.3,-164 -84.29,-164 -84.28,-164 -84.27,-164 -84.26,-164 -84.25,-164 -84.24,-164 -84.23,-164 -84.22,-164 -84.21,-164 -84.2))"] |
|
Methyl Bromide Measurements in the Taylor Dome M3C1 Ice Core
|
0636953 |
2014-09-10 | Saltzman, Eric; Aydin, Murat |
Methyl Chloride, Methyl Bromide, and Carbonyl Sulfide in Deep Antarctic Ice Cores |
The data set includes methyl bromide (CH3Br) measurements made on air extracted from 70 samples from the Taylor Dome M3C1 ice core. CH3Br was measured in air from the Taylor Dome ice core to reconstruct an atmospheric record for the Holocene (11-0 kyr B.P.) and part of the last glacial period (50-30 kyr B.P.). | ["POINT(157.4 -77.44)"] |
|
Methyl Chloride Measurements in the Taylor Dome M3C1 Ice Core
|
0636953 |
2014-09-10 | Saltzman, Eric; Aydin, Murat |
Methyl Chloride, Methyl Bromide, and Carbonyl Sulfide in Deep Antarctic Ice Cores |
This data set includes methyl chloride (CH<sub>3</sub>CI) measurements made on air extracted from 62 samples from the Taylor Dome M3C1 ice core in East Antarctica. CH<sub>3</sub>CI was measured in air from the Taylor Dome ice core to reconstruct an atmospheric record for the Holocene (11-0 kyr B.P.) and part of the last glacial period (50-30 kyr B.P.). | ["POINT(158.43 -77.48)"] |
|
WAIS Divide Sonic Log Data
|
0944199 |
2014-09-03 | Waddington, Edwin D.; Matsuoka, Kenichi; Kluskiewicz, Dan; McCarthy, Michael; Anandakrishnan, Sridhar |
Collaborative research: acoustic logging of the WAIS Divide borehole |
This data set contains a record of speeds for vertically-propagating compression-waves measured throughout the depth of ice that surrounds the WAIS-D borehole. Multiple logs provide redundant measurements for all depths. Data for individual wave-speed measurements were included, as well as 3 m running averages for each log. A Takeaway Profile that represents our interpretation of the combined data set is also included. | ["POINT(-112.085 -79.467)"] |
|
Iceberg Capsize Kinematics and Energetics
|
0944193 |
2014-08-25 | MacAyeal, Douglas |
Collaborative Research: Explosive Ice-Shelf Disintegration |
This data set represents a typical single iceberg capsize experiment. Included in this data set are all the parameters of the plastic iceberg's density and dimensions, the density of the water surrounding the iceberg, and the value of gravitational acceleration. The timeseries data consists of all the kinematic and energetic variables as a function of time for the iceberg capsize experiment. | ["POLYGON((-88 42,-87.9 42,-87.8 42,-87.7 42,-87.6 42,-87.5 42,-87.4 42,-87.3 42,-87.2 42,-87.1 42,-87 42,-87 41.9,-87 41.8,-87 41.7,-87 41.6,-87 41.5,-87 41.4,-87 41.3,-87 41.2,-87 41.1,-87 41,-87.1 41,-87.2 41,-87.3 41,-87.4 41,-87.5 41,-87.6 41,-87.7 41,-87.8 41,-87.9 41,-88 41,-88 41.1,-88 41.2,-88 41.3,-88 41.4,-88 41.5,-88 41.6,-88 41.7,-88 41.8,-88 41.9,-88 42))"] |
|
WAIS Divide Ice Core Electrical Conductance Measurements, Antarctica
|
0440817 0230396 0440819 0944191 0944348 |
2014-08-18 | Fudge, T. J.; Taylor, Kendrick C. |
Collaborative Research: Establishing the Chronology and Histories of Accumulation and Ice Dynamics for the WAIS Divide Core |
This data set contains electrical measurements that were used to develop the WDC06A-7 timescale. | ["POINT(-112.1115 -79.481)"] |
|
Bubble Number-density Data and Modeled Paleoclimates
|
0539578 |
2014-08-14 | Alley, Richard; Fegyveresi, John | No project link provided | This data set includes bubble number-density measured at depths from 120 meters to 560 meters at 20-meter intervals in both horizontal and vertical samples. The data set also includes modeled temperature reconstructions based on the model developed by Spencer and others (2006). | ["POINT(-112.3 -79.433333)"] |
|
MODIS Mosaic of Antarctica 2008-2009 (MOA2009) Image Map
|
None | 2014-07-17 | Haran, Terry; Bohlander, Jennifer; Scambos, Ted; Painter, Thomas; Fahnestock, Mark | No project link provided | The MODIS Mosaic of Antarctica 2008-2009 (MOA2009) Image Map consists of two cloud-free digital image maps that show mean surface morphology and a quantitative measure of optical snow grain size on the Antarctic continent and surrounding islands using 260 orbit swaths from the Moderate Resolution Imaging Spectroradiometer (MODIS) instruments on board the NASA EOS Aqua and Terra satellites. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
High-resolution Atmospheric CO2 during 7.4-9.0 ka
|
0944764 |
2014-06-25 | Brook, Edward J.; Ahn, Jinho |
Atmospheric CO2 and Abrupt Climate Change |
This data set provides a new CO2 record from the Siple Dome ice core, Antarctica, that covers 7.4-9.0 ka (thousand years) with 8- to 16-year resolution. A small, about 1-2 ppm, increase of atmospheric CO2 during the 8.2 ka event was observed. The increase is not significant when compared to other centennial variations in the Holocene that are not linked to large temperature changes. The results do not agree with leaf stomata records that suggest a CO2 decrease of up to ~25 ppm and imply that the sensitivity of atmospheric CO2 to the primarily northern hemisphere cooling of the 8.2 ka event was limited. | ["POINT(-148.82 -81.66)"] |
|
Temperature Profile of the West Antarctic Ice Sheet Divide Deep Borehole
|
0539232 |
2014-04-30 | Cuffey, Kurt M.; Clow, Gary D. |
Collaborative Research: Physical Properties of the WAIS Divide Deep Core |
This data set reports depth versus temperatures in the fluid-filled portion of the West Antarctic Ice Sheet Divide (WAIS–D) deep borehole (70 to 3328 meters depth). Data were acquired on December 5, 2011 and have been post-processed to convert resistance to temperature. | ["POINT(-112.0865 -79.4676)"] |
|
Standing Water Depth on Larsen B Ice Shelf
|
0944248 |
2014-04-29 | MacAyeal, Douglas |
Model Studies of Surface Water Behavior on Ice Shelves |
This data set addresses why surface melt water lakes on ice shelves and ice sheets are notably influential in triggering ice-shelf break-up and modulating seasonal ice flow, and are thus principle avenues by which environmental change can be transmitted to the ice sheets of Antarctica and Greenland. A comparative analysis is performed of lake geometry and derived depth (using Landsat image reflectance) in two distinct regions, one a collapsing ice shelf and the other an ablation zone of a land terminating ice sheet, to better characterize the range of surface lake variability. | ["POLYGON((-63 -63,-62.2 -63,-61.4 -63,-60.6 -63,-59.8 -63,-59 -63,-58.2 -63,-57.4 -63,-56.6 -63,-55.8 -63,-55 -63,-55 -63.4,-55 -63.8,-55 -64.2,-55 -64.6,-55 -65,-55 -65.4,-55 -65.8,-55 -66.2,-55 -66.6,-55 -67,-55.8 -67,-56.6 -67,-57.4 -67,-58.2 -67,-59 -67,-59.8 -67,-60.6 -67,-61.4 -67,-62.2 -67,-63 -67,-63 -66.6,-63 -66.2,-63 -65.8,-63 -65.4,-63 -65,-63 -64.6,-63 -64.2,-63 -63.8,-63 -63.4,-63 -63))"] |
|
Interaction of Ice Stream Flow with Heterogeneous Beds
|
0838811 |
2014-04-14 | Sergienko, Olga |
Model Investigation of Ice Stream/Subglacial Lake Systems |
This data set consists of outputs of several numerical models simulating ice stream flow over undulated bed, interaction of ice stream flow, and subglacial and supraglacial hydraulic systems. All simulations are performed for idealized geometries using finite-element models. | ["POINT(0 -78)"] |
|
WAIS Divide Laser Dust Logger Data
|
0738658 |
2014-04-03 | Bay, Ryan |
Climatology, Meteorology, and Microbial Metabolism in Ice with Dust Loggers and Fluorimetry |
This data set consists of data from optical logs made at the WAIS Divide with a laser dust logger in clear ice at depths between 1403.58 meters and 3329.8 meters. | ["POINT(-112.135833 -79.482778)"] |
|
Major Ion Chemistry Data of WAIS Divide Ice Core Brittle Ice
|
0839066 |
2014-03-19 | Cole-Dai, Jihong |
Major Ion Chemical Analysis of Brittle Ice in the WAIS Divide Ice Core |
The brittle ice section (577-1300 m) of the main WAIS Divide ice core (WDC06A) was analyzed for major ion concentrations with ion chromatography. | ["POINT(-112.1 -79.5)"] |
|
Measurements of Air and Snow Photochemical Species at WAIS Divide, Antarctica
|
0636929 |
2014-03-17 | Bales, Roger |
Atmospheric, Snow and Firn Chemistry Studies for Interpretation of WAIS-Divide Cores |
This data set contains atmospheric mixing ratios of nitric oxide, ozone, hydrogen peroxide, methylhydroperoxide, and concentrations in surface snow and in snow pits of nitrate, nitrite, and hydrogen peroxide at the WAIS Divide deep ice-coring site. | ["POINT(-112.085 -79.467)"] |
|
Late Holocene Methane Concentrations from WAIS Divide and GISP2
|
0944584 0538538 0538578 |
2014-01-31 | Mitchell, Logan E |
Collaborative Research: Constructing an Ultra-high Resolution Atmospheric Methane Record for the Last 140,000 Years from WAIS Divide Core. |
This data set measures methane concentrations in ancient air trapped in the West Antarctic Ice Sheet (WAIS) Divide and Greenland Ice Sheet Project (GISP2) ice cores; presenting two, high-resolution ice core methane records of the past 2500 years, one from each pole. These measurements were used to reconstruct the methane Inter-Polar Difference (IPD) during the late Holocene. Also included are model results of methane emissions that were presented in the manuscript describing this data set. | ["POINT(-112.0865 -79.4676)", "POINT(-38.5 72.6)"] |
|
Major Ion Concentrations in WDC05Q and WDC06A Ice Cores (WAIS Divide)
|
0538553 |
2014-01-08 | Cole-Dai, Jihong |
Major Ion Chemistry of WAIS Divide Ice Core |
This data set contains major ion concentrations from the chemical analysis of two WAIS Divide ice cores (WDC05Q, 0-114 m; WDC06A, 0-129 m). The analytical technique is Mettler-based Continuous Flow Analysis with online Ion Chromatography detection (CFA-IC). Depth resolution is approximately 2 cm per sample or per measurement. | ["POINT(-112 -79.5)"] |
|
Pleistocene East Antarctic Ice Sheet History as Recorded in Sediment Provenance and Chronology of High-elevation TAM Moraines
|
0944475 |
2014-01-01 | Kaplan, Michael |
Collaborative Research: Pleistocene East Antarctic Ice Sheet History as Recorded in Sediment Provenance and Chronology of High-elevation TAM Moraines |
Intellectual Merit: The proposed work will investigate changes in the compositional variation of glacial tills over time across two concentric sequences of Pleistocene moraines located adjacent to the heads of East Antarctic outlet glaciers in the Transantarctic Mountains (TAM). The chronologic framework for this work will be generated from cosmogenic exposure ages of boulders on prominent morainal ridges. The PIs hypothesize that variations in till composition may indicate a change in ice flow direction or a change in the composition of the original source area, while ages of the moraines provide a long-term terrestrial perspective on ice sheet dynamics. Both results are vital for modeling experiments that aim to reconstruct the East Antarctic Ice Sheet and assess its role in the global climate system and its potential impact on global sea level rise. The variation of till compositions through time also allows for a more accurate interpretation of sediment cores from the Ross Sea and the Southern Ocean. Additionally, till exposures at the head of some East Antarctic outlet glaciers have been shown to contain subglacial material derived from East Antarctic bedrock, providing a window through the ice to view East Antarctica's inaccessible bedrock. Till samples will be collected from two well-preserved sequences of moraine crests at Mt. Howe (head of Scott Glacier) and Mt. Achernar (between Beardmore and Nimrod Glaciers). Each size fraction in glacial till provides potentially valuable information, and the PIs will measure the petrography of the clast and sand fractions, quantitative X-ray diffraction on the crushed <2mm fraction, elemental abundance of the silt/clay fraction, and U/Pb of detrital zircons in the sand fraction. Data collection will rely on established methods previously used in this region and the PIs will also explore new methods to assess their efficacy. On the same moraines crests sampled for provenance studies, the PIs will sample for cosmogenic surface exposure analyses to provide a chronologic framework at the sites for provenance changes through time. Broader Impact: The proposed research involves graduate and undergraduate training in a diverse array of laboratory methods. Students and PIs will be make presentations to community and campus groups, as well as conduct interviews with local news outlets. The proposed work also establishes a new, potentially long-term, collaboration between scientists at IUPUI and LDEO and brings a new PI (Kaplan) into the field of Antarctic Earth Sciences. | ["POLYGON((-180 -84.1,-176.97 -84.1,-173.94 -84.1,-170.91 -84.1,-167.88 -84.1,-164.85 -84.1,-161.82 -84.1,-158.79 -84.1,-155.76 -84.1,-152.73 -84.1,-149.7 -84.1,-149.7 -84.43,-149.7 -84.76,-149.7 -85.09,-149.7 -85.42,-149.7 -85.75,-149.7 -86.08,-149.7 -86.41,-149.7 -86.74,-149.7 -87.07,-149.7 -87.4,-152.73 -87.4,-155.76 -87.4,-158.79 -87.4,-161.82 -87.4,-164.85 -87.4,-167.88 -87.4,-170.91 -87.4,-173.94 -87.4,-176.97 -87.4,180 -87.4,178.12 -87.4,176.24 -87.4,174.36 -87.4,172.48 -87.4,170.6 -87.4,168.72 -87.4,166.84 -87.4,164.96 -87.4,163.08 -87.4,161.2 -87.4,161.2 -87.07,161.2 -86.74,161.2 -86.41,161.2 -86.08,161.2 -85.75,161.2 -85.42,161.2 -85.09,161.2 -84.76,161.2 -84.43,161.2 -84.1,163.08 -84.1,164.96 -84.1,166.84 -84.1,168.72 -84.1,170.6 -84.1,172.48 -84.1,174.36 -84.1,176.24 -84.1,178.12 -84.1,-180 -84.1))"] |
|
Abrupt Environmental Change in the Larsen Ice Shelf System (LARISSA) - Marine Ecosystems
|
0732983 |
2014-01-01 | Vernet, Maria |
Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans |
Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach - Marine Ecosystems. A profound transformation in ecosystem structure and function is occurring in coastal waters of the western Weddell Sea, with the collapse of the Larsen B ice shelf. This transformation appears to be yielding a redistribution of energy flow between chemoautotrophic and photosynthetic production, and to be causing the rapid demise of the extraordinary seep ecosystem discovered beneath the ice shelf. This event provides an ideal opportunity to examine fundamental aspects of ecosystem transition associated with climate change. We propose to test the following hypotheses to elucidate the transformations occurring in marine ecosystems as a consequence of the Larsen B collapse: (1) The biogeographic isolation and sub-ice shelf setting of the Larsen B seep has led to novel habitat characteristics, chemoautotrophically dependent taxa and functional adaptations. (2) Benthic communities beneath the former Larsen B ice shelf are fundamentally different from assemblages at similar depths in the Weddell sea-ice zone, and resemble oligotrophic deep-sea communities. Larsen B assemblages are undergoing rapid change. (3) The previously dark, oligotrophic waters of the Larsen B embayment now support a thriving phototrophic community, with production rates and phytoplankton composition similar to other productive areas of the Weddell Sea. To document rapid changes occurring in the Larsen B ecosystem, we will use a remotely operated vehicle, shipboard samplers, and moored sediment traps. We will characterize microbial, macrofaunal and megafaunal components of the seep community; evaluate patterns of surface productivity, export flux, and benthic faunal composition in areas previously covered by the ice shelf, and compare these areas to the open sea-ice zone. These changes will be placed within the geological, glaciological and climatological context that led to ice-shelf retreat, through companion research projects funded in concert with this effort. Together these projects will help predict the likely consequences of ice-shelf collapse to marine ecosystems in other regions of Antarctica vulnerable to climate change. The research features international collaborators from Argentina, Belgium, Canada, Germany, Spain and the United Kingdom. The broader impacts include participation of a science writer; broadcast of science segments by members of the Jim Lehrer News Hour (Public Broadcasting System); material for summer courses in environmental change; mentoring of graduate students and postdoctoral fellows; and showcasing scientific activities and findings to students and public through podcasts. | ["POLYGON((-66 -62,-65.3 -62,-64.6 -62,-63.9 -62,-63.2 -62,-62.5 -62,-61.8 -62,-61.1 -62,-60.4 -62,-59.7 -62,-59 -62,-59 -62.8,-59 -63.6,-59 -64.4,-59 -65.2,-59 -66,-59 -66.8,-59 -67.6,-59 -68.4,-59 -69.2,-59 -70,-59.7 -70,-60.4 -70,-61.1 -70,-61.8 -70,-62.5 -70,-63.2 -70,-63.9 -70,-64.6 -70,-65.3 -70,-66 -70,-66 -69.2,-66 -68.4,-66 -67.6,-66 -66.8,-66 -66,-66 -65.2,-66 -64.4,-66 -63.6,-66 -62.8,-66 -62))"] |
|
Ocean-Ice Interaction in the Amundsen Sea Sector of West Antarctica
|
0732804 |
2014-01-01 | McPhee, Miles G. |
Collaborative Research; IPY: Ocean-Ice Interaction in the Amundsen Sea sector of West Antarctica |
The Office of Polar Programs, Antarctic Integrated and System Science Program has made this award to support an interdisciplinary study of the effects of the ocean on the stability of glacial ice in the most dynamic region the West Antarctic Ice Sheet, namely the Pine Island Glacier in the Amundsen Sea Embayment. The collaborative project builds on the knowledge gained by the highly successful West Antarctic Ice Sheet program and is being jointly sponsored with NASA. Recent observations indicate a significant ice loss, equivalent to 10% of the ongoing increase in sea-level rise, in this region. These changes are largest along the coast and propagate rapidly inland, indicating the critical impact of the ocean on ice sheet stability in the region. While a broad range of remote sensing and ground-based instrumentation is available to characterize changes of the ice surface and internal structure (deformation, ice motion, melt) and the shape of the underlying sediment and rock bed, instrumentation has yet to be successfully deployed for observing boundary layer processes of the ocean cavity which underlies the floating ice shelf and where rapid melting is apparently occurring. Innovative, mini ocean sensors that can be lowered through boreholes in the ice shelf (about 500 m thick) will be developed and deployed to automatically provide ocean profiling information over at least three years. Their data will be transmitted through a conducting cable frozen in the borehole to the surface where it will be further transmitted via satellite to a laboratory in the US. Geophysical and remote sensing methods (seismic, GPS, altimetry, stereo imaging, radar profiling) will be applied to map the geometry of the ice shelf, the shape of the sub ice-shelf cavity, the ice surface geometry and deformations within the glacial ice. To integrate the seismic, glaciological and oceanographic observations, a new 3-dimensional coupled ice-ocean model is being developed which will be the first of its kind. NASA is supporting satellite based research and the deployment of a robotic-camera system to explore the environment in the ocean cavity underlying the ice shelf and NSF is supporting all other aspects of this study. Broader impacts: This project is motivated by the potential societal impacts of rapid sea level rise and should result in critically needed improvements in characterizing and predicting the behavior of coupled ocean-ice systems. It is a contribution to the International Polar Year and was endorsed by the International Council for Science as a component of the 'Multidisciplinary Study of the Amundsen Sea Embayment' proposal #258 of the honeycomb of endorsed IPY activities. The research involves substantial international partnerships with the British Antarctic Survey and the University of Bristol in the UK. The investigators will partner with the previously funded 'Polar Palooza' education and outreach program in addition to undertaking a diverse set of outreach activities of their own. Eight graduate students and one undergraduate as well as one post doc will be integrated into this research project. | ["POINT(166.25 -77.42)"] |
|
Dating and Paleoenvironmental Studies on Ancient Ice in the Dry Valleys, Antarctica
|
0636731 |
2014-01-01 | Bender, Michael |
Collaborative Research: Dating and Paleoenvironmental Studies on Ancient Ice in the Dry Valleys, Antarctica |
This project studies ancient ice buried in the Dry Valleys of Antarctica. The ice, which may approach ten million years in age, will be dated using argon and uranium radioisotope techniques. High-risk work, if successful it will offer the first and perhaps only samples of the Earth's atmosphere from millions of years in the past. These samples could offer critically important tests of paleoclimate records and proxies, as well as a glimpse into the characteristics of a past world much like the predicted future, warmer Earth. The broader impacts are graduate student education, and potentially contributing to society's understanding of global climate change and sea level rise. | ["POLYGON((-180 -72.6,-176.887 -72.6,-173.774 -72.6,-170.661 -72.6,-167.548 -72.6,-164.435 -72.6,-161.322 -72.6,-158.209 -72.6,-155.096 -72.6,-151.983 -72.6,-148.87 -72.6,-148.87 -73.533,-148.87 -74.466,-148.87 -75.399,-148.87 -76.332,-148.87 -77.265,-148.87 -78.198,-148.87 -79.131,-148.87 -80.064,-148.87 -80.997,-148.87 -81.93,-151.983 -81.93,-155.096 -81.93,-158.209 -81.93,-161.322 -81.93,-164.435 -81.93,-167.548 -81.93,-170.661 -81.93,-173.774 -81.93,-176.887 -81.93,180 -81.93,174.335 -81.93,168.67 -81.93,163.005 -81.93,157.34 -81.93,151.675 -81.93,146.01 -81.93,140.345 -81.93,134.68 -81.93,129.015 -81.93,123.35 -81.93,123.35 -80.997,123.35 -80.064,123.35 -79.131,123.35 -78.198,123.35 -77.265,123.35 -76.332,123.35 -75.399,123.35 -74.466,123.35 -73.533,123.35 -72.6,129.015 -72.6,134.68 -72.6,140.345 -72.6,146.01 -72.6,151.675 -72.6,157.34 -72.6,163.005 -72.6,168.67 -72.6,174.335 -72.6,-180 -72.6))"] |
|
Exploring A 2 Million + Year Ice Climate Archive-Allan Hills Blue Ice Area (2MBIA)
|
0838849 |
2014-01-01 | Bender, Michael |
Collaborative Research: Exploring A 2 Million + Year Ice Climate Archive-Allan Hills Blue Ice Area (2MBIA) |
This award supports a project to generate an absolute timescale for the Allan Hills Blue Ice Area (BIA), and then to reconstruct details of past climate changes and greenhouse gas concentrations for certain time periods back to 2.5 Ma. Ice ages will be determined by applying emerging methods for absolute and relative dating of trapped air bubbles (based on Argon-40/Argon-38, delta-18O of O2, and the O2/N2 ratio). To demonstrate the potential of the Allan Hills BIAs as a paleoclimate archive trenches and ice cores will be collected for age intervals corresponding to 110-140 ka, 1 Ma, and 2.5 Ma. During the proposed two field seasons a total of 6x100 m and additional 15 m cores will be combined with trenching. The intellectual merit of the proposed activity is that the results of this work will extend the landmark work of EPICA and other deep ice coring efforts, which give records dating back to 0.8 Ma, and will complement work planned by IPICS to drill a continuous Antarctic ice core extending to 1.5 Ma. The results will help to advance understanding of major climate regimes and transitions that took place between 0-2.5 Ma, including the 40 kyr world and the mid-Pleistocene climate transition. A major long-term scientific goal is to provide a transformative approach to the collection of paleoclimate records by establishing an 'International Climate Park' in the Allan Hills BIA that would enable sampling of large quantities of known age ice as old as 2.5 Ma, by any interested American or foreign investigator. The broader impacts resulting from the proposed activity include training students who are well versed in advanced field, laboratory and numerical modeling methods combining geochemistry, glaciology, and paleoclimatology. We will include material relevant to our proposed research in our ongoing efforts in local education and in our outreach efforts for media. The University of Maine already has cyberinfrastructure, using state of the art web-based technology, which can provide a wide community of scientists with fast access to the results of our research. The work will contribute to the broad array of climate change studies that is informing worldwide understanding of natural and anthropogenic forced climate change, and the options for responding. This award has field work in Antarctica. | ["POLYGON((159.16667 -76.66667,159.19167 -76.66667,159.21667 -76.66667,159.24167 -76.66667,159.26667 -76.66667,159.29167 -76.66667,159.31667 -76.66667,159.34167 -76.66667,159.36667 -76.66667,159.39167 -76.66667,159.41667 -76.66667,159.41667 -76.673336,159.41667 -76.680002,159.41667 -76.686668,159.41667 -76.693334,159.41667 -76.7,159.41667 -76.706666,159.41667 -76.713332,159.41667 -76.719998,159.41667 -76.726664,159.41667 -76.73333,159.39167 -76.73333,159.36667 -76.73333,159.34167 -76.73333,159.31667 -76.73333,159.29167 -76.73333,159.26667 -76.73333,159.24167 -76.73333,159.21667 -76.73333,159.19167 -76.73333,159.16667 -76.73333,159.16667 -76.726664,159.16667 -76.719998,159.16667 -76.713332,159.16667 -76.706666,159.16667 -76.7,159.16667 -76.693334,159.16667 -76.686668,159.16667 -76.680002,159.16667 -76.673336,159.16667 -76.66667))"] |
|
The Biogeochemical Evolution of Dissolved Organic Matter in a Fluvial System on the Cotton Glacier, Antarctica
|
0838970 |
2014-01-01 | Foreman, Christine |
Collaborative Research: The Biogeochemical Evolution of Dissolved Organic Matter in a Fluvial System on the Cotton Glacier, Antarctica |
Dissolved organic matter (DOM) comprises a significant pool of Earth's organic carbon that dwarfs the amount present in living aquatic organisms. The properties and reactivity of DOM are not well defined, and the evolution of autochthonous DOM from its precursor materials in freshwater has not been observed. Recent sampling of a supraglacial stream formed on the Cotton Glacier in the Transantarctic Mountains revealed DOM that more closely resembles an assemblage of recognizable precursor organic compounds, based upon its UV-VIS and fluorescence spectra. It is suggested that the DOM from this water evolved over time to resemble materials present in marine and many inland surface waters. The transient nature of the system i.e., it reforms seasonally, also prevents any accumulation of the refractory DOM present in most surface waters. Thus, the Cotton Glacier provides us with a unique environment to study the formation of DOM from precursor materials. An interdisciplinary team will study the biogeochemistry of this progenitor DOM and how microbes modify it. By focusing on the chemical composition of the DOM as it shifts from precursor material to the more humified fractions, the investigators will relate this transition to bioavailability, enzymatic activity, community composition and microbial growth efficiency. This project will support education at all levels, K-12, high school, undergraduate, graduate and post-doc and will increase participation by under-represented groups in science. Towards these goals, the investigators have established relationships with girls' schools and Native American programs. Additional outreach will be carried out in coordination with PolarTREC, PolarPalooza, and if possible, an Antarctic Artist and Writer. | ["POINT(161.667 -77.117)"] |
|
History of the East Antarctic Ice Sheet since the mid-Miocene: New Evidence from Provenance of Ice-rafted Debris
|
0944489 |
2014-01-01 | Williams, Trevor; Hemming, Sidney R. |
History of the East Antarctic Ice Sheet since the mid-Miocene: New Evidence from Provenance of Ice-rafted Debris |
Intellectual Merit: The PIs propose to study the stability and dynamics of the East Antarctic ice sheet during the Pliocene in the area of the Wilkes and Aurora subglacial basins. Models indicate the ice sheet is most sensitive to warming in these low-lying areas. This study is important as there is very little direct evidence about which parts of the East Antarctic ice sheet became unstable under warm conditions. In a pilot study the PIs have shown that the isotopic geochemical signature of downcore ice-rafted debris (IRD) can be linked to continental source areas indicating which parts of the ice sheet reached the coast and calved IRD-bearing icebergs. Their initial results suggest rapid iceberg discharge from the Wilkes Land and Adelie Land coastal areas at times in the late Miocene and early Pliocene. In this study the PIs will analyze IRD from IODP sediment cores collected on the continental rise off East Antarctica. By analyzing 40Ar/39Ar ages of hornblende IRD grains, U-Pb ages of zircons, and Sm-Nd isotopes of the fine fraction of several IRD-rich layers for each core, they will be able to fingerprint continental source areas that indicate ice extent and dynamics on East Antarctica. The PIs will also carry out detailed studies across a few of these layers to characterize the anatomy of the ice-rafting event and better understand the mechanism of ice destabilization. Broader impacts: The data collected will be important for scientists in a broad variety of fields. The project will involve one undergraduate student and one summer intern at LDEO, and a graduate student at Imperial College London. The project will expose to cutting edge methodologies as well as an international research team. Data from the project will be deposited in the online databases (SedDB) and all results and methods will be made available to the scientific community through publications in peer-reviewed journals and attendance at international conferences | ["POLYGON((-55 -58,-33.2 -58,-11.4 -58,10.4 -58,32.2 -58,54 -58,75.8 -58,97.6 -58,119.4 -58,141.2 -58,163 -58,163 -60,163 -62,163 -64,163 -66,163 -68,163 -70,163 -72,163 -74,163 -76,163 -78,141.2 -78,119.4 -78,97.6 -78,75.8 -78,54 -78,32.2 -78,10.4 -78,-11.4 -78,-33.2 -78,-55 -78,-55 -76,-55 -74,-55 -72,-55 -70,-55 -68,-55 -66,-55 -64,-55 -62,-55 -60,-55 -58))"] |
|
East Antarctic outlet glacier contributions to the Ross Sea from chronology of detrital grains
|
1043619 |
2014-01-01 | Hemming, Sidney R. |
Collaborative Research: East Antarctic outlet glacier contributions to the Ross Sea from chronology of detrital grains |
Intellectual Merit: The PIs proposed a provenance study of glacial deposits in the Ross Embayment that will provide a broad scale geochronologic survey of detrital minerals in till to help characterize bedrock beneath the East Antarctic ice sheet and constrain Antarctica?s glacial history. This project capitalizes on previous investments in field sampling. Analytical tools applied to single mineral grains extracted from existing collections of glacial till will generate ?fingerprints? of East Antarctic outlet glaciers and West Antarctic till to refine paleo-ice flow models for the Ross Embayment during the last glacial maximum, older records from ANDRILL cores, and to assess IRD sources in the Southern Ocean. New provenance tracers will include a suite of geochronological methods that together provide greater insights into the orogenic and erosional history the region. This project will include U/Pb of detrital zircons, (U-Th)/He on a subset of the U/Pb dated zircons, as well as Ar-Ar of detrital hornblende, mica and feldspars. Broader Impacts: This research will train one M.S. student at IUPUI, a Ph.D. student at Columbia, and several undergraduates at both institutions. Graduate students involved in the project will be involved in mentoring undergraduate researchers. Incorporation of research discoveries will be brought into the classroom by providing concrete examples and exercises at the appropriate level. Licht and Columbia graduate student E. Pierce are developing outreach projects with local secondary school teachers to investigate the provenance of glacial materials in their local areas. The research will have broad applicability to many fields. | ["POLYGON((-180 -63.997,-179.7982 -63.997,-179.5964 -63.997,-179.3946 -63.997,-179.1928 -63.997,-178.991 -63.997,-178.7892 -63.997,-178.5874 -63.997,-178.3856 -63.997,-178.1838 -63.997,-177.982 -63.997,-177.982 -66.3324,-177.982 -68.6678,-177.982 -71.0032,-177.982 -73.3386,-177.982 -75.674,-177.982 -78.0094,-177.982 -80.3448,-177.982 -82.6802,-177.982 -85.0156,-177.982 -87.351,-178.1838 -87.351,-178.3856 -87.351,-178.5874 -87.351,-178.7892 -87.351,-178.991 -87.351,-179.1928 -87.351,-179.3946 -87.351,-179.5964 -87.351,-179.7982 -87.351,180 -87.351,172.54273 -87.351,165.08546 -87.351,157.62819 -87.351,150.17092 -87.351,142.71365 -87.351,135.25638 -87.351,127.79911 -87.351,120.34184 -87.351,112.88457 -87.351,105.4273 -87.351,105.4273 -85.0156,105.4273 -82.6802,105.4273 -80.3448,105.4273 -78.0094,105.4273 -75.674,105.4273 -73.3386,105.4273 -71.0032,105.4273 -68.6678,105.4273 -66.3324,105.4273 -63.997,112.88457 -63.997,120.34184 -63.997,127.79911 -63.997,135.25638 -63.997,142.71365 -63.997,150.17092 -63.997,157.62819 -63.997,165.08546 -63.997,172.54273 -63.997,-180 -63.997))"] |
|
Geodynamic Models of Subsidence and Lithospheric Flexure at the ANDRILL Drill Sites: Implications for Cenozoic Tectonics and Ice Sheet History
|
1043700 |
2014-01-01 | Harry, Dennis L. |
Geodynamic Models of Subsidence and Lithospheric Flexure at the ANDRILL Drill Sites: Implications for Cenozoic Tectonics and Ice Sheet History |
Intellectual Merit: This research will place the subsidence history of the southern Victoria Land Basin into a quantitative geodynamic context and will assess the influence of flexure associated with late Neogene volcanic loading of the crust by the Erebus Volcanic Group. This will be done by extending geodynamic models of extension in the West Antarctic Rift System to include extensional hiatuses hypothesized to have occurred during the Late Paleogene and Miocene, and by developing a new geodynamic model of volcanic loading and associated lithosphere flexure. Finite element and finite difference modeling methods will be used. In the first phase of the project, a series of extensional geodynamic models will be developed to examine the effect that proposed extensional hiatuses have on the style of extension, with emphasis placed on developing a process based understanding of the change in rift style from diffuse during the Late Cretaceous to more focused during the Cenozoic. The models will test the hypotheses that extensional hiatuses led to the change in rifting style, and will place constraints on the timing and duration of the hiatuses. The second phase of the project will use the thermal and rheological properties of the previous models to constrain the flexural rigidity of the lithosphere in order to model the flexural response to volcanic loading to test the hypotheses that flexural subsidence contributed to cyclic changes between grounded and floating ice at the ANDRILL AND-1A site, complicating interpretations of the climatic record from this core, and that flexure contributes to the stress orientation at the AND-2B site, which is inconsistent with the expected regional extensional stress orientation. Broader impacts: The project will train an undergraduate student and an M.S. student. Outreach activities include a planned series of talks at regional high schools, junior colleges, and 4-year colleges that have geology programs. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Fate of Drilling Fluids during the South McMurdo Sound Project (SMS) of the Antarctic Geological Drilling Program (ANDRILL)
|
1043740 |
2014-01-01 | Lenczewski, Melissa |
Fate of Drilling Fluids during the South McMurdo Sound Project (SMS) of the Antarctic Geological Drilling Program (ANDRILL) |
The PI proposes to utilize computer models used by hydrogeologists to establish the fate and transport of contamination and determine the extent of drilling fluid contamination in the ANDRILL SMS core. For these models, previously collected logs of lithology, porosity, fracture density, fracture type, fracture orientation, drilling fluid loss, drilling fluid characteristics and temperature will be used as input parameters. In addition, biodegradation and sorption constants for the drilling fluid will be determined and incorporated into the models. Samples of drilling fluids used during coring as well as the return fluids were collected at the drill site using standard microbiological sampling techniques. Fluids will be tested at in situ temperatures under aerobic and anaerobic conditions to determine biodegradation constants. Sorption will be determined between the drilling fluids and core samples using standard isotherm methods. Geochemical and microbial fingerprints of the fluids and the changes during biodegradation will determine the potential impact of the drilling fluids on the isolated microbial communities and the geochemistry within various subsurface lithologic units beneath the southern McMurdo Sound in Antarctica. The results of this study could potentially provide guidelines on developing less detrimental methods for future exploration, if deemed necessary through this research. This proposed project will train a graduate student. The methods developed for analyses of samples in this project will serve as a guide for future studies of similar interest and will improve the understanding of ecological impacts of geologic drilling in Antarctica. The results of this study will be used as a reference for comparison with future studies examining newly developed, and improved, sample collection methods in future exploratory drilling projects in pristine environments. The PI is new to Antarctic research. | ["POLYGON((165 -77.5,165.3 -77.5,165.6 -77.5,165.9 -77.5,166.2 -77.5,166.5 -77.5,166.8 -77.5,167.1 -77.5,167.4 -77.5,167.7 -77.5,168 -77.5,168 -77.6,168 -77.7,168 -77.8,168 -77.9,168 -78,168 -78.1,168 -78.2,168 -78.3,168 -78.4,168 -78.5,167.7 -78.5,167.4 -78.5,167.1 -78.5,166.8 -78.5,166.5 -78.5,166.2 -78.5,165.9 -78.5,165.6 -78.5,165.3 -78.5,165 -78.5,165 -78.4,165 -78.3,165 -78.2,165 -78.1,165 -78,165 -77.9,165 -77.8,165 -77.7,165 -77.6,165 -77.5))"] |
|
Are the Dry Valleys Getting Wetter? A Preliminary Assessment of Wetness Across the McMurdo Dry Valleys Landscape
|
1045215 |
2014-01-01 | Gooseff, Michael N. |
EAGER: Are the Dry Valleys Getting Wetter? A Preliminary Assessment of Wetness Across the McMurdo Dry Valleys Landscape |
Intellectual Merit: Until recently, wetted soils in the Dry Valleys were generally only found adjacent to streams and lakes. Since the warm austral summer of 2002, numerous "wet spots" have been observed far from shorelines on relatively flat valley floor locations and as downslope fingers of flow on valley walls. The source of the water to wet these soils is unclear, as is the spatial and temporal pattern of occurrence from year to year. Their significance is potentially great as enhanced soil moisture may change the thermodynamics, hydrology, and erosion rate of surface soils, and facilitate transport of materials that had previously been stable. These changes to the soil active layer could significantly modify permafrost and ground ice stability within the Dry Valleys. The PIs seek to investigate these changes to address two competing hypotheses: that the source of water to these ?wet spots? is ground ice melt and that the source of this water is snowmelt. The PIs will document the spatiotemporal dynamics of these wet areas using high frequency remote sensing data from QuickBird and WorldView satellites to document the occurrence, dimensions, and growth of wet spots during the 2010-11 and 2011-12 austral summers. They will test their hypotheses by determining whether wet spots recur in the same locations in each season, and they will compare present to past distribution using archived imagery. They will also determine whether spatial snow accumulation patterns and temporal ablation patterns are coincident with wet spot formation. Broader impacts: One graduate student will be trained on this project. Findings will be reported at scientific meetings and published in peer reviewed journals. They will also develop a teaching module on remote sensing applications to hydrology for the Modular Curriculum for Hydrologic Advancement and an innovative prototype project designed to leverage public participation in mapping wet spots and snow patches across the Dry Valleys through the use of social media and mobile computing applications. | ["POLYGON((160 -77.25,160.5 -77.25,161 -77.25,161.5 -77.25,162 -77.25,162.5 -77.25,163 -77.25,163.5 -77.25,164 -77.25,164.5 -77.25,165 -77.25,165 -77.375,165 -77.5,165 -77.625,165 -77.75,165 -77.875,165 -78,165 -78.125,165 -78.25,165 -78.375,165 -78.5,164.5 -78.5,164 -78.5,163.5 -78.5,163 -78.5,162.5 -78.5,162 -78.5,161.5 -78.5,161 -78.5,160.5 -78.5,160 -78.5,160 -78.375,160 -78.25,160 -78.125,160 -78,160 -77.875,160 -77.75,160 -77.625,160 -77.5,160 -77.375,160 -77.25))"] |
|
Validating contrasting terrestrial climate-sensitive Pliocene deposits through high resolution modeling of paleo-environments in the Transantarctic Mountains
|
1354231 |
2014-01-01 | Kowalewski, Douglas |
Validating contrasting terrestrial climate-sensitive Pliocene deposits through high resolution modeling of paleo-environments in the Transantarctic Mountains |
Intellectual Merit: Neogene sediment records recovered by ANDRILL suggest multiple events of open water conditions and elevated sea surface temperatures at times when terrestrial data from the McMurdo Dry Valleys indicate hyper arid, cold, desert conditions. Interpretation of the ANDRILL data suggests the West Antarctic Ice Sheet is highly sensitive to changes in Pliocene sea surface temperatures and this conclusion has been supported by recent Global Circulation Model results for the early to mid Pliocene. The PIs propose to model paleo-ice configurations and warm orbits associated with a WAIS collapse to assess potential climate change in East Antarctica. During such episodes of polar warmth they propose to answer: What is the limit of ablation along the East Antarctic Ice Sheet?; Are relict landforms in the Dry Valleys susceptible to modification from increase in maximum summertime temperatures?; and Is there sufficient increase in minimum wintertime temperatures to sustain a tundra environment in the Dry Valleys? Integration of depositional records and model outputs have the potential to test the performance of numerical models currently under development as part of ANDRILL; reconcile inconsistencies between marine and terrestrial paleoclimate records in high Southern Latitudes; and improve understanding of Antarctic climate and ice volume sensitivity to forcing for both the East Antarctic and West Antarctic Ice Sheets. Broader impacts: Results from this study have the potential to be used widely by the research community. Outreach to local elementary schools from other funded efforts will continue and be extended to homeschooled students. A Post Doc will be supported as part of this award. | ["POLYGON((-160 -70,-156 -70,-152 -70,-148 -70,-144 -70,-140 -70,-136 -70,-132 -70,-128 -70,-124 -70,-120 -70,-120 -71.5,-120 -73,-120 -74.5,-120 -76,-120 -77.5,-120 -79,-120 -80.5,-120 -82,-120 -83.5,-120 -85,-124 -85,-128 -85,-132 -85,-136 -85,-140 -85,-144 -85,-148 -85,-152 -85,-156 -85,-160 -85,-160 -83.5,-160 -82,-160 -80.5,-160 -79,-160 -77.5,-160 -76,-160 -74.5,-160 -73,-160 -71.5,-160 -70))"] |
|
Heard Island Glacier Fluctuations and Climatic Change - 2003/04 Fieldwork
|
None | 2013-12-19 | Truffer, Martin | No project link provided | This data set contains data on the physical flow characteristics, mass balance, sub-glacial topography, and recent fluctuations of the Heard Island glacier. The data were collected for The Antarctic Science Advisory Committee (ASAC) project 2363, a continuation of ASAC project 1158. A full report of the data collected and the work completed are available for download with the data. The data were collected by the Heard Island glaciology team during the 2003-04 Australian Antarctic Division expedition, as well as some data from the previous expedition in November 2000. | ["POLYGON((-73.45 -53.1,-58.745 -53.1,-44.04 -53.1,-29.335 -53.1,-14.63 -53.1,0.075 -53.1,14.78 -53.1,29.485 -53.1,44.19 -53.1,58.895 -53.1,73.6 -53.1,73.6 -53.12,73.6 -53.14,73.6 -53.16,73.6 -53.18,73.6 -53.2,73.6 -53.22,73.6 -53.24,73.6 -53.26,73.6 -53.28,73.6 -53.3,58.895 -53.3,44.19 -53.3,29.485 -53.3,14.78 -53.3,0.075 -53.3,-14.63 -53.3,-29.335 -53.3,-44.04 -53.3,-58.745 -53.3,-73.45 -53.3,-73.45 -53.28,-73.45 -53.26,-73.45 -53.24,-73.45 -53.22,-73.45 -53.2,-73.45 -53.18,-73.45 -53.16,-73.45 -53.14,-73.45 -53.12,-73.45 -53.1))"] |
|
Major Ion Concentrations in 2004 South Pole Ice Core
|
0337933 |
2013-11-19 | Cole-Dai, Jihong |
Collaborative Research: Investigating Atmospheric Chemistry and Dynamics through Oxygen and Sulfur Isotopes in Volcanic Sulfate from South Pole Ice Cores |
A 180 m ice core drilled at South Pole in 2004/2005 was analyzed for concentrations of major ions at a depth resolution of approximately 2 cm. Measured ions are chloride, nitrate, sulfate, sodium, potassium, magnesium and calcium. The bottom of the core has been dated to 1830 years before 2004. | ["POINT(0 -90)"] |
|
Allan Hills Stable Water Isotopes
|
0838843 |
2013-10-24 | Kurbatov, Andrei V.; Spaulding, Nicole; Mayewski, Paul A.; Introne, Douglas |
Collaborative Research: Exploring A 2 Million + Year Ice Climate Archive-Allan Hills Blue Ice Area (2MBIA) |
This data set includes stable water isotope values at 10 m resolution along an approximately 5 km transect through the main icefield of the Allan Hills Blue Ice Area, and at 15 cm within a 225 m core drilled at the midpoint of the transect. | ["POLYGON((159 -75.67,159.025 -75.67,159.05 -75.67,159.075 -75.67,159.1 -75.67,159.125 -75.67,159.15 -75.67,159.175 -75.67,159.2 -75.67,159.225 -75.67,159.25 -75.67,159.25 -75.786,159.25 -75.902,159.25 -76.018,159.25 -76.134,159.25 -76.25,159.25 -76.366,159.25 -76.482,159.25 -76.598,159.25 -76.714,159.25 -76.83,159.225 -76.83,159.2 -76.83,159.175 -76.83,159.15 -76.83,159.125 -76.83,159.1 -76.83,159.075 -76.83,159.05 -76.83,159.025 -76.83,159 -76.83,159 -76.714,159 -76.598,159 -76.482,159 -76.366,159 -76.25,159 -76.134,159 -76.018,159 -75.902,159 -75.786,159 -75.67))"] |
|
Abrupt Change in Atmospheric CO2 During the Last Ice Age
|
0944764 |
2013-08-08 | Brook, Edward J.; Ahn, Jinho |
Atmospheric CO2 and Abrupt Climate Change |
During the last glacial period atmospheric carbon dioxide and temperature in Antarctica varied in a similar fashion on millennial time scales, but previous work indicates that these changes were gradual. In a detailed analysis of one event, we now find that approximately half of the CO2 increase that occurred during the 1500 year cold period between Dansgaard-Oeschger (DO) Events 8 and 9 happened rapidly, over less than two centuries. This rise in CO2 was synchronous with, or slightly later than, a rapid increase of Antarctic temperature inferred from stable isotopes. | ["POINT(-119.83 -80.01)", "POINT(-148.82 -81.66)"] |
|
US International Trans-Antarctic Scientific Expedition (US ITASE) Glaciochemical Data
|
9725057 0837883 |
2013-07-11 | Dixon, Daniel A.; Mayewski, Paul A. |
Science Management for the United States Component of the International Trans-Antarctic Expedition |
This data set contains sub-annually resolved ice core chemistry data from various sites on the Antarctic Ice Sheet during the US International Trans-Antarctic Scientific Expedition (US ITASE) deployments. Researchers conducted experiments approximately every 30 - 300 km looking for clues representing climatic conditions over the past 200-1000+ years. Ice cores obtained for the glaciochemical component of the US ITASE research were analyzed for soluble major ion content and in some cases trace elements. Extreme events, such as volcanic eruptions, provide absolute age horizons within each core that are easily identified in chemical profiles. Our chemical analysis is also useful for quantifying anthropogenic impact, biogeochemical cycling, and for reconstructing past atmospheric circulation patterns. | ["POLYGON((-76.1 -77.68,-53.253 -77.68,-30.406 -77.68,-7.559 -77.68,15.288 -77.68,38.135 -77.68,60.982 -77.68,83.829 -77.68,106.676 -77.68,129.523 -77.68,152.37 -77.68,152.37 -78.912,152.37 -80.144,152.37 -81.376,152.37 -82.608,152.37 -83.84,152.37 -85.072,152.37 -86.304,152.37 -87.536,152.37 -88.768,152.37 -90,129.523 -90,106.676 -90,83.829 -90,60.982 -90,38.135 -90,15.288 -90,-7.559 -90,-30.406 -90,-53.253 -90,-76.1 -90,-76.1 -88.768,-76.1 -87.536,-76.1 -86.304,-76.1 -85.072,-76.1 -83.84,-76.1 -82.608,-76.1 -81.376,-76.1 -80.144,-76.1 -78.912,-76.1 -77.68))"] |
|
Temperature of the West Antarctic Ice Sheet
|
9615420 8519083 |
2013-06-13 | Engelhardt, Hermann |
Basal Conditions of Ice Stream D and Related Borehole Studies of Antarctic Ice Stream Mechanics |
This data set contains temperature-depth profile measurements taken in 22 boreholes drilled on the West Antarctic Ice Sheet, which exhibit two distinctly different thermal states of basal ice: a warm state and a relatively colder state. The data are available in ASCII Text Format (.txt) and Portable Document Format (PDF) via FTP. | ["POLYGON((-148.808333 -81.07364,-147.5100275 -81.07364,-146.211722 -81.07364,-144.9134165 -81.07364,-143.615111 -81.07364,-142.3168055 -81.07364,-141.0185 -81.07364,-139.7201945 -81.07364,-138.421889 -81.07364,-137.1235835 -81.07364,-135.825278 -81.07364,-135.825278 -81.3341927,-135.825278 -81.5947454,-135.825278 -81.8552981,-135.825278 -82.1158508,-135.825278 -82.3764035,-135.825278 -82.6369562,-135.825278 -82.8975089,-135.825278 -83.1580616,-135.825278 -83.4186143,-135.825278 -83.679167,-137.1235835 -83.679167,-138.421889 -83.679167,-139.7201945 -83.679167,-141.0185 -83.679167,-142.3168055 -83.679167,-143.615111 -83.679167,-144.9134165 -83.679167,-146.211722 -83.679167,-147.5100275 -83.679167,-148.808333 -83.679167,-148.808333 -83.4186143,-148.808333 -83.1580616,-148.808333 -82.8975089,-148.808333 -82.6369562,-148.808333 -82.3764035,-148.808333 -82.1158508,-148.808333 -81.8552981,-148.808333 -81.5947454,-148.808333 -81.3341927,-148.808333 -81.07364))"] |
|
Depths to Ice-cemented Soils in High-elevation Quartermain Mountains, Dry Valleys, Antarctica
|
None | 2013-03-18 | Marinova, Margarita M.; McKay, Christopher P. | No project link provided | This data set is comprised of four surveyed valleys focusing on the depth to ground ice in the high-elevation Quartermain Mountains in the Beacon Valley area: University Valley, Farnell Valley, and two unnamed valleys north of University Valley, which we will call Valley North and Valley 2 North. To date it is only in the high-elevation Dry Valleys that the climatic conditions are dry and cold enough that cryotic (always below 0°C) yet dry soil is found over ice-cemented ground (McKay et al. 1998), (Bockheim 2007). The data provide a qualitative and quantitative contribution towards understanding the type and distribution of ground ice in the Quartermain Mountains at a high spatial resolution. The measurements can be used to improve and validate models of ice stability and distribution. This data set contains observations of depth to ice-cemented ground, based on 475 measurements at 147 sites. Note that the measurements represent the thickness of the active layer plus any dry permafrost layer, which is ubiquitous in this region, and not just the thickness of the active layer. | ["POLYGON((160.666667 -77.833333,160.681667 -77.833333,160.696667 -77.833333,160.711667 -77.833333,160.726667 -77.833333,160.741667 -77.833333,160.756667 -77.833333,160.771667 -77.833333,160.786667 -77.833333,160.801667 -77.833333,160.816667 -77.833333,160.816667 -77.8399997,160.816667 -77.8466664,160.816667 -77.8533331,160.816667 -77.8599998,160.816667 -77.8666665,160.816667 -77.8733332,160.816667 -77.8799999,160.816667 -77.8866666,160.816667 -77.8933333,160.816667 -77.9,160.801667 -77.9,160.786667 -77.9,160.771667 -77.9,160.756667 -77.9,160.741667 -77.9,160.726667 -77.9,160.711667 -77.9,160.696667 -77.9,160.681667 -77.9,160.666667 -77.9,160.666667 -77.8933333,160.666667 -77.8866666,160.666667 -77.8799999,160.666667 -77.8733332,160.666667 -77.8666665,160.666667 -77.8599998,160.666667 -77.8533331,160.666667 -77.8466664,160.666667 -77.8399997,160.666667 -77.833333))"] |
|
West Antarctica Ice Core and Climate Model Data
|
0837988 |
2013-03-13 | Steig, Eric J. |
Collaborative Research: Antarctic Climate Reconstruction Utilizing the US ITASE Ice Core Array (2009- 2012) |
This data set includes ice core water isotope data from Antarctic ice cores covering the last 200 to 2000 years. | ["POLYGON((-180 -65,-144 -65,-108 -65,-72 -65,-36 -65,0 -65,36 -65,72 -65,108 -65,144 -65,180 -65,180 -67.5,180 -70,180 -72.5,180 -75,180 -77.5,180 -80,180 -82.5,180 -85,180 -87.5,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87.5,-180 -85,-180 -82.5,-180 -80,-180 -77.5,-180 -75,-180 -72.5,-180 -70,-180 -67.5,-180 -65))"] |
|
Videos of Basal Ice in Boreholes on the Kamb Ice Stream in West Antarctica
|
9615420 |
2013-02-14 | Engelhardt, Hermann |
Basal Conditions of Ice Stream D and Related Borehole Studies of Antarctic Ice Stream Mechanics |
This data set is a collection of video data of basal ice taken in a borehole on the Kamb Ice Stream in West Antarctica. Ice streams are an expression of the inherent instability of the West Antarctic Ice Sheet, and their behavior is a key control on the overall ice-sheet mass balance. Understanding the response of the ice sheet in a warming climate requires a thorough understanding of the internal dynamics of ice streams, in addition to the relevant ice-atmosphere and ice-ocean interactions in the region. The basal environment of the ice streams and of many glaciers is a key scientific interest, including conditions, mainly basal sliding, that lead to fast flow of the ice. The purpose of this data set is to present a review of the full range of original video recordings from the basal ice of the Kamb Ice Stream. Direct observations at the ice-stream bed are a crucial complement to modeling efforts predicting future scenarios in a warming climate. | ["POINT(-136.404633 -82.39955)"] |
|
Thermoregulation in Free-Living Antarctic Seals: The Missing Link in Effective Ecological Modeling
|
1043779 |
2013-01-01 | Mellish, Jo-Ann |
Collaborative Research: THERMOREGULATION IN FREE-LIVING ANTARCTIC SEALS: THE MISSING LINK IN EFFECTIVE ECOLOGICAL MODELING |
Despite being an essential physiological component of homeotherm life in polar regions, little is known about the energetic requirements for thermoregulation in either air or water for high- latitude seals. In a joint field and modeling study, the principal investigators will quantify these costs for the Weddell seal under both ambient air and water conditions. The field research will include innovative heat flux, digestive and locomotor cost telemetry on 40 free-ranging seals combined with assessments of animal health (morphometrics, hematology and clinical chemistry panels), quantity (ultrasound) and quality (tissue biopsy) of blubber insulation, and determination of surface skin temperature patterns (infrared thermography). Field-collected data will be combined with an established individual based computational energetics model to define cost-added thresholds in body condition for different body masses. This study will fill a major knowledge gap by providing data essential to modeling all aspects of pinniped life history, in particular for ice seals. Such parameterization of energetic cost components will be essential for the accurate modeling of responses by pinnipeds to environmental variance, including direct and indirect effects driven by climate change. The study also will provide extensive opportunities in polar field work, animal telemetry, biochemical analyses and computational modeling for up to three undergraduate students and one post-doctoral researcher. Integrated education and outreach efforts will educate the public (K-12 through adult) on the importance of quantifying energetic costs of thermoregulation for marine mammals and the need to understand responses of species to environmental variance. This effort will include a custom-built, interactive hands-on mobile exhibit, and development of content for an Ocean Today kiosk. | ["POLYGON((165.83333 -77.51528,165.923331 -77.51528,166.013332 -77.51528,166.103333 -77.51528,166.193334 -77.51528,166.283335 -77.51528,166.373336 -77.51528,166.463337 -77.51528,166.553338 -77.51528,166.643339 -77.51528,166.73334 -77.51528,166.73334 -77.55153,166.73334 -77.58778,166.73334 -77.62403,166.73334 -77.66028,166.73334 -77.69653,166.73334 -77.73278,166.73334 -77.76903,166.73334 -77.80528,166.73334 -77.84153,166.73334 -77.87778,166.643339 -77.87778,166.553338 -77.87778,166.463337 -77.87778,166.373336 -77.87778,166.283335 -77.87778,166.193334 -77.87778,166.103333 -77.87778,166.013332 -77.87778,165.923331 -77.87778,165.83333 -77.87778,165.83333 -77.84153,165.83333 -77.80528,165.83333 -77.76903,165.83333 -77.73278,165.83333 -77.69653,165.83333 -77.66028,165.83333 -77.62403,165.83333 -77.58778,165.83333 -77.55153,165.83333 -77.51528))"] |
|
The Sea Ice System in Antarctic Summer, Oden Southern Ocean Expedition (OSO 2010-11)
|
0839053 |
2013-01-01 | Ackley, Stephen |
The Sea Ice System in Antarctic Summer, Oden Southern Ocean Expedition (OSO 2010-11) |
Several aspect of the seasonal melting and reformation cycle of Antarctic sea ice appear to be divergent from those occurring in the Arctic. This is most clearly demonstrated by the dramatic diminishing extent and thinning of the Arctic sea ice, to be contrasted to the changes in Antarctic sea-ice extent, which recently (decadaly) shows small increases. Current climate models do not resolve this discrepancy which likely results from both a lack of relevant observational sea-ice data in the Antarctic, along with inadequacies in the physical parameterization of sea-ice properties in climate models. Researchers will take advantage of the cruise track of the I/B Oden during transit through the Antarctic sea-ice zones in the region of the Bellingshausen, Amundsen and Ross (BAR) seas on a cruise to McMurdo Station. Because of its remoteness and inaccessibility, the BAR region is of considerable scientific interest as being one of the last under described and perhaps unexploited marine ecosystems left on the planet. A series of on station and underway observations of sea ice properties will be undertaken, thematically linked to broader questions of summer ice survival and baseline physical properties (e.g. estimates of heat and salt fluxes). In situ spatiotemporal variability of sea-ice cover extent, thickness and snow cover depths will be observed. | ["POLYGON((-180 -67.05,-170.9866 -67.05,-161.9732 -67.05,-152.9598 -67.05,-143.9464 -67.05,-134.933 -67.05,-125.9196 -67.05,-116.9062 -67.05,-107.8928 -67.05,-98.8794 -67.05,-89.866 -67.05,-89.866 -68.1033,-89.866 -69.1566,-89.866 -70.2099,-89.866 -71.2632,-89.866 -72.3165,-89.866 -73.3698,-89.866 -74.4231,-89.866 -75.4764,-89.866 -76.5297,-89.866 -77.583,-98.8794 -77.583,-107.8928 -77.583,-116.9062 -77.583,-125.9196 -77.583,-134.933 -77.583,-143.9464 -77.583,-152.9598 -77.583,-161.9732 -77.583,-170.9866 -77.583,180 -77.583,178.57 -77.583,177.14 -77.583,175.71 -77.583,174.28 -77.583,172.85 -77.583,171.42 -77.583,169.99 -77.583,168.56 -77.583,167.13 -77.583,165.7 -77.583,165.7 -76.5297,165.7 -75.4764,165.7 -74.4231,165.7 -73.3698,165.7 -72.3165,165.7 -71.2632,165.7 -70.2099,165.7 -69.1566,165.7 -68.1033,165.7 -67.05,167.13 -67.05,168.56 -67.05,169.99 -67.05,171.42 -67.05,172.85 -67.05,174.28 -67.05,175.71 -67.05,177.14 -67.05,178.57 -67.05,-180 -67.05))"] |
|
Metabolic Activities and Gene Expression of Marine Psychrophiles in Cold Ice
|
0739783 |
2013-01-01 | Junge, Karen |
Metabolic Activities and Gene Expression of Marine Psychrophiles in Cold Ice |
The mechanisms enabling bacteria to be metabolically active at very low temperatures are of considerable importance to polar microbial ecology, astrobiology, climate and cryopreservation. This research program has two main objectives. The first is to investigate metabolic activities and gene expression of polar marine psychrophilic bacteria when confronted with freezing conditions at temperatures above the eutectic of seawater (<54C) to unveil cold adaptation mechanisms with relevance to wintertime sea-ice ecology. The second objective is to discern if psychrophilic processes of leucine incorporation into proteins, shown to occur to -196C, amount to metabolic activity providing for the survival of cells or are merely biochemical reactions still possible in flash-frozen samples without any effect on survival. We will examine extracellular and intracellular processes of psychrophilic activity above and below the eutectic by (i) determining the temperature range of metabolic activities such as DNA synthesis, carbon utilization, respiration and ATP generation using radioactive tracer technology, including a control at liquid helium temperature (-268.9C), (ii) analyzing gene expression in ice using whole genome and microarray analyses and iii) examining the role of exopolymeric substances (EPS) and ice micro-physics for the observed activity using an in-situ microscopy technique. Results of the proposed research can be expected to aid in the determination of cellular and genetic strategies that allow cells to maintain activity at extremely low temperatures within an icy matrix and/or to resume activity again when more growth-permissive conditions are encountered. The research is an interdisciplinary collaboration involving three different institutions with participants in Oceanography, Genomics, and Geophysical Sciences. The proposed activity will support the beginning professional career of a female researcher and will serve as the basis for several undergraduate student laboratory projects. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] |
|
Abrupt Environmental Change in the Larsen Ice Shelf System (LARISSA) - Cryosphere and Oceans
|
0732655 |
2013-01-01 | Thompson, Lonnie G.; Mosley-Thompson, Ellen |
Collaborative Research in IPY: Abrupt Environmental Change in the Larsen Ice Shelf System, a Multidisciplinary Approach -- Cryosphere and Oceans |
Like no other region on Earth, the northern Antarctic Peninsula represents a spectacular natural laboratory of climate change and provides the opportunity to study the record of past climate and ecological shifts alongside the present-day changes in one of the most rapidly warming regions on Earth. This award supported the cryospheric and oceanographic components of an integrated multi-disciplinary program to address these rapid and fundamental changes now taking place in Antarctic Peninsula (AP). By making use of a marine research platform (the RV NB Palmer and on-board helicopters) and additional logistical support from the Argentine Antarctic program, the project brought together glaciologists, oceanographers, marine geologists and biologists who have worked collaboratively to address fundamental interdisciplinary questions regarding climate change. | ["POLYGON((-63 -60,-62.6 -60,-62.2 -60,-61.8 -60,-61.4 -60,-61 -60,-60.6 -60,-60.2 -60,-59.8 -60,-59.4 -60,-59 -60,-59 -60.5,-59 -61,-59 -61.5,-59 -62,-59 -62.5,-59 -63,-59 -63.5,-59 -64,-59 -64.5,-59 -65,-59.4 -65,-59.8 -65,-60.2 -65,-60.6 -65,-61 -65,-61.4 -65,-61.8 -65,-62.2 -65,-62.6 -65,-63 -65,-63 -64.5,-63 -64,-63 -63.5,-63 -63,-63 -62.5,-63 -62,-63 -61.5,-63 -61,-63 -60.5,-63 -60))"] |
|
The Role of Snow Patches on the Spatial Distribution of Soil Microbial Communities and Biogeochemical Cycling in the Antarctic Dry Valleys
|
0838850 |
2013-01-01 | Gooseff, Michael N. |
Collaborative Research: The Role of Snow Patches on the Spatial Distribution of Soil Microbial Communities and Biogeochemical Cycling in the Antarctic Dry Valleys |
Two models have been proposed to describe controls over microbial biogeography. One model proposes that microbes are ubiquitously distributed across the global environment, and that environmental conditions select for taxa physiologically adapted to local physical conditions. An alternative model predicts that dispersal is the important limitation to the distribution of microorganisms and that spatial heterogeneity of microbial communities is a result of both dispersal and local environmental limitations. According to both models, spatial heterogeneity of microbial communities may be especially pronounced in extreme ecosystems where the environmental selection for organisms with suitable physiology is most strongly manifest. We propose that Antarctic terrestrial environments are ideal places to examine microbial biogeography for 3 reasons: 1) the pristine nature and remoteness of Antarctica minimizes the prevalence of exotic species dispersed through human vectors; 2) the extreme conditions of Antarctic environments provide a strong environmental filter which limits the establishment of non-indigenous taxa; and 3) extreme heterogeneity in the terrestrial environment provides natural gradients of soil conditions (temperature, water and nutrient availability). In the proposed research we will investigate the influence of snow on the composition and spatial distribution of soil microbial communities and linked biogeochemical cycling in the McMurdo Dry Valleys. We will conduct fieldwork at the landscape scale (repeated remote sensing to characterize snow distribution), at the valley and patch scales (quantify snow patch ablation, microbial communities and biogeochemical cycling in subnivian soils). We hypothesize that snow patches play an important role in structuring the spatial distribution of soil microbial communities and their associated ecosystem functioning because of the physical and hydrological influences that snow patches have on the soil environment. The research will contribute to greater public awareness of the importance of polar research to fundamental questions of biology, ecology and hydrology through direct linkages with International Antarctic Institute public outreach activities, including dissemination of web-based learning units on environmental science and microbiology, targeted as resources for secondary and post-secondary educators. Three graduate students, one postdoctoral scholar and multiple undergraduates will participate in the research activities. | ["POLYGON((-163.3 -77.62,-163.202 -77.62,-163.104 -77.62,-163.006 -77.62,-162.908 -77.62,-162.81 -77.62,-162.712 -77.62,-162.614 -77.62,-162.516 -77.62,-162.418 -77.62,-162.32 -77.62,-162.32 -77.631,-162.32 -77.642,-162.32 -77.653,-162.32 -77.664,-162.32 -77.675,-162.32 -77.686,-162.32 -77.697,-162.32 -77.708,-162.32 -77.719,-162.32 -77.73,-162.418 -77.73,-162.516 -77.73,-162.614 -77.73,-162.712 -77.73,-162.81 -77.73,-162.908 -77.73,-163.006 -77.73,-163.104 -77.73,-163.202 -77.73,-163.3 -77.73,-163.3 -77.719,-163.3 -77.708,-163.3 -77.697,-163.3 -77.686,-163.3 -77.675,-163.3 -77.664,-163.3 -77.653,-163.3 -77.642,-163.3 -77.631,-163.3 -77.62))"] |
|
Linkages among Mitochondrial Form, Function and Thermal Tolerance of Antarctic Notothenioid Fishes
|
0741301 |
2013-01-01 | O'Brien, Kristin |
Collaborative Research: Linkages among Mitochondrial Form, Function and Thermal Tolerance of Antarctic Notothenioid Fishes |
Antarctic notothenioid fishes have evolved in the Southern Ocean for 10-14 MY under an unusual set of circumstances. Their characteristics include the complete absence of the circulating oxygen-binding protein, hemoglobin (Hb) within the Channichthyid (Icefish) family of notothenioids. Moreover, some species within the 16 members of this family have also lost the ability to express the oxygen-binding and storage protein, myoglobin (Mb) in cardiac muscle. Our previous work has determined that the loss of Hb and/or Mb is correlated with significant increases in densities of mitochondria within oxidative tissues, and extensive remodeling of these vital organelles. To date, nothing is known about how modifications in mitochondrial architecture of icefishes affect organelle function, or more importantly, how they affect organismal-level physiology. Most critical for Antarctic fishes is that mitochondrial characteristics have been linked to how well ectotherms can withstand increases in temperature. This collaborative research project will address the hypothesis that the unusual mitochondrial architecture of Antarctic Channichthyids has led to changes in function that impact their ability to withstand elevations in temperature. Specifically, the research will (1) determine if the unusual mitochondrial architecture of icefishes affects function and contributes to organismal thermal sensitivity, (2) identify differences in organismal thermal tolerance between red- and white- blooded notothenioids, (3) identify molecular mechanisms regulating changes in mitochondrial structure in icefishes. The results may establish channichthyid icefishes as a sentinel taxon for signaling the impact of global warming on the Southern Ocean. Broad impacts of this project will be realized by participation of high school biology teachers in field work through cooperation with the ARMADA project at the University of Rhode Island, as well as graduate education. | ["POLYGON((-64.45 -63.29,-64.249 -63.29,-64.048 -63.29,-63.847 -63.29,-63.646 -63.29,-63.445 -63.29,-63.244 -63.29,-63.043 -63.29,-62.842 -63.29,-62.641 -63.29,-62.44 -63.29,-62.44 -63.371,-62.44 -63.452,-62.44 -63.533,-62.44 -63.614,-62.44 -63.695,-62.44 -63.776,-62.44 -63.857,-62.44 -63.938,-62.44 -64.019,-62.44 -64.1,-62.641 -64.1,-62.842 -64.1,-63.043 -64.1,-63.244 -64.1,-63.445 -64.1,-63.646 -64.1,-63.847 -64.1,-64.048 -64.1,-64.249 -64.1,-64.45 -64.1,-64.45 -64.019,-64.45 -63.938,-64.45 -63.857,-64.45 -63.776,-64.45 -63.695,-64.45 -63.614,-64.45 -63.533,-64.45 -63.452,-64.45 -63.371,-64.45 -63.29))"] |
|
Geochemistry and Microbiology of the Extreme Aquatic Environment in Lake Vida, East Antarctica
|
0739698 0739681 |
2013-01-01 | Murray, Alison |
Collaborative Research: Geochemistry and Microbiology of the Extreme Aquatic Environment in Lake Vida, East Antarctica |
Lake Vida is the largest lake of the McMurdo Dry Valleys, with an approximately 20 m ice cover overlaying a brine of unknown depth with at least 7 times seawater salinity and temperatures below -10 degrees C year-round. Samples of brine collected from ice above the main water body contain 1) the highest nitrous oxide levels of any natural water body on Earth, 2) unusual geochemistry including anomalously high ammonia and iron concentrations, 3) high microbial counts with an unusual proportion (99%) of ultramicrobacteria. The microbial community is unique even compared to other Dry Valley Lakes. The research proposes to enter, for the first time the main brine body below the thick ice of Lake Vida and perform in situ measurements, collect samples of the brine column, and collect sediment cores from the lake bottom for detailed geochemical and microbiological analyses. The results will allow the characterization of present and past life in the lake, assessment of modern and past sedimentary processes, and determination of the lake's history. The research will be conducted by a multidisciplinary team that will uncover the biogeochemical processes associated with a non-photosynthetic microbial community isolated for a significant period of time. This research will address diversity, adaptive mechanisms and evolutionary processes in the context of the physical evolution of the environment of Lake Vida. Results will be widely disseminated through publications, presentations at national and international meetings, through the Subglacial Antarctic Lake Exploration (SALE) web site and the McMurdo LTER web site. The research will support three graduate students and three undergraduate research assistants. The results will be incorporated into a new undergraduate biogeosciences course at the University of Illinois at Chicago which has an extremely diverse student body, dominated by minorities. | ["POINT(161.931 -77.3885)"] |
|
Biogeochemistry of Cyanobactrial Mats and Hyporheic Zone Microbes in McMurdo Dry Valley Glacial Meltwater Streams
|
0739648 |
2013-01-01 | Cary, S. Craig |
Collaborative Research: Biogeochemistry of Cyanobactrial Mats and Hyporheic Zone Microbes in McMurdo Dry Valley Glacial Meltwater Streams |
The glacial streams of the McMurdo Dry Valleys have extensive cyanobacterial mats that are a probable source of fixed C and N to the Valleys. The research will examine the interplay between the microbial mats in the ephemeral glacial streams and the microbiota of the hyporheic soils (wetted soil zone) underlying and adjacent to those mats. It is hypothesized that the mats are important sources of organic carbon and fixed nitrogen for the soil communities of the hyporheic zone, and release dissolved organic carbon (DOC) and nitrogen (DON) that serves the entire Dry Valley ecosystem. Field efforts will entail both observational and experimental components. Direct comparisons will be made between the mats and microbial populations underlying naturally rehydrated and desiccated mat areas, and between mat areas in the melt streams of the Adams and Miers Glaciers in Miers Valley. Both physiological and phylogenetic indices of the soil microbiota will be examined. Observations will include estimates of rates of mat carbon and nitrogen fixation, soil respiration and leucine and thymidine uptake (as measures of protein & DNA synthesis, respectively) by soil bacteria, bacterial densities and their molecular ecology. Experimental manipulations will include experimental re-wetting of soils and observations of the time course of response of the microbial community. The research will integrate modern molecular genetic approaches (ARISA-DNA fingerprinting and ultra deep 16S rDNA microbial phylogenetic analysis) with geochemistry to study the diversity, ecology, and function of microbial communities that thrive in these extreme environments. The broader impacts of the project include research and educational opportunities for graduate students and a postdoctoral associate. The P.I.s will involve undergraduates as work-study students and in REU programs, and will participate in educational and outreach programs. | ["POINT(163 -77.5)"] |
|
Siple Dome A (SDMA) Grain Orientation 640 - 790 Meters
|
0738975 |
2012-11-26 | Baker, Ian; Obbard, Rachel; Sieg, Katherine |
Advanced Microstructural Characterization of Polar Ice Cores |
This data set characterizes the microstructure in ice cores, in particular the microstructural locations of impurities, grain orientations, and strain gradients. The fabric of polycrystalline ice is typically described using only the c-axis orientation, but this is insufficient for a full description of grain orientations in this hexagonal material. Thus, both the a-axis and c-axis are used in this data set showing pole figures for five depths of the Siple Dome (SDMA) core between 640 m and 790 m and misorientation angle distribution for the same grains. | ["POINT(-148.82 -81.66)"] |
|
Ice Core Chemistry from the Norwegian-U.S. Scientific Traverse of East Antarctica, IPY 2007-2009
|
0538416 |
2012-08-08 | McConnell, Joseph |
Collaborative Research: Norwegian-United States IPY Scientific Traverse: Climate Variability and Glaciology in East Antarctica |
This data set consists of sodium (Na) and magnesium (Mg) concentrations versus depth in seven ice cores that were obtained by the Norwegian-U.S. Scientific Traverse of East Antarctica during the International Polar Year (IPY) 2007-2009. Additional glaciochemical analyses and a final depth-age scale will be added as these data become available. Data are available via FTP. | ["POLYGON((-54.9 -73.7,-49.57 -73.7,-44.24 -73.7,-38.91 -73.7,-33.58 -73.7,-28.25 -73.7,-22.92 -73.7,-17.59 -73.7,-12.26 -73.7,-6.93 -73.7,-1.6 -73.7,-1.6 -74.61,-1.6 -75.52,-1.6 -76.43,-1.6 -77.34,-1.6 -78.25,-1.6 -79.16,-1.6 -80.07,-1.6 -80.98,-1.6 -81.89,-1.6 -82.8,-6.93 -82.8,-12.26 -82.8,-17.59 -82.8,-22.92 -82.8,-28.25 -82.8,-33.58 -82.8,-38.91 -82.8,-44.24 -82.8,-49.57 -82.8,-54.9 -82.8,-54.9 -81.89,-54.9 -80.98,-54.9 -80.07,-54.9 -79.16,-54.9 -78.25,-54.9 -77.34,-54.9 -76.43,-54.9 -75.52,-54.9 -74.61,-54.9 -73.7))"] |
|
Light Absorption Coefficients for Soluble Species in Snow, Dome C, Antarctica
|
0230288 |
2012-06-26 | Anastasio, Cort; Robles, Tony |
Laboratory Studies of Photochemistry in Antarctic Snow and Ice |
This data set contains light absorption coefficients for soluble chromophores (light-absorbing chemicals) and concentrations of hydrogen peroxide (HOOH) and nitrate (NO3-) in ten snow samples that were collected in 2003 at Dome C, Antarctica. Data are available via FTP. | ["POINT(-123.3 -75.1)"] |
|
Coastal and Terminus History of the Eastern Amundsen Sea Embayment, West Antarctica, 1972 - 2011
|
0739654 |
2012-05-30 | Macgregor, Joseph A.; Catania, Ginny; Markowski, Michael; Andrews, Alan G. |
Collaborative Research: Ice-flow history of the Thwaites Glacier, West Antarctica |
This data set provides a coastline history of the eastern Amundsen Sea Embayment and terminus histories of its outlet glaciers derived from those coastlines. These outlet glaciers include Smith, Haynes, Thwaites, and Pine Island Glaciers. The coastlines were derived from detailed tracing of Landsat imagery between late 1972 and late 2011 (at a scale of 1:50,000). The data set also uses some additional data from other sources. The terminus histories are calculated as the intersections between these coastlines and 1996 flowlines. Data are available via FTP in ESRI shapefile and comma separated value (.csv) formats. | ["POLYGON((-110 -74,-109 -74,-108 -74,-107 -74,-106 -74,-105 -74,-104 -74,-103 -74,-102 -74,-101 -74,-100 -74,-100 -74.2,-100 -74.4,-100 -74.6,-100 -74.8,-100 -75,-100 -75.2,-100 -75.4,-100 -75.6,-100 -75.8,-100 -76,-101 -76,-102 -76,-103 -76,-104 -76,-105 -76,-106 -76,-107 -76,-108 -76,-109 -76,-110 -76,-110 -75.8,-110 -75.6,-110 -75.4,-110 -75.2,-110 -75,-110 -74.8,-110 -74.6,-110 -74.4,-110 -74.2,-110 -74))"] |
|
Subglacial water flow paths under Thwaites Glacier, West Antarctica
|
0636724 |
2012-05-21 | Carter, Sasha P.; Young, Duncan A.; Blankenship, Donald D. |
Collaborative Research: Synthesis of Thwaites Glacier Dynamics: Diagnostic and Prognostic Sensitivity Studies of a West Antarctic Outlet System |
This data set contains subglacial water flow paths beneath Thwaites Glacier, West Antarctica, interpreted from ice thickness and bed elevation measurements collected between 7 December 2004 and 31 January 2005 by the Airborne Geophysical Survey of the Amundsen Embayment (AGASEA) expedition. Data consist of an ASCII text file with geographical coordinates, hydraulic head, and bed and surface elevations, and a corresponding .pdf map. Data are available via FTP. | ["POLYGON((-120 -75,-117 -75,-114 -75,-111 -75,-108 -75,-105 -75,-102 -75,-99 -75,-96 -75,-93 -75,-90 -75,-90 -75.5,-90 -76,-90 -76.5,-90 -77,-90 -77.5,-90 -78,-90 -78.5,-90 -79,-90 -79.5,-90 -80,-93 -80,-96 -80,-99 -80,-102 -80,-105 -80,-108 -80,-111 -80,-114 -80,-117 -80,-120 -80,-120 -79.5,-120 -79,-120 -78.5,-120 -78,-120 -77.5,-120 -77,-120 -76.5,-120 -76,-120 -75.5,-120 -75))"] |
|
AGASEA Ice Thickness Profile Data from the Amundsen Sea Embayment, Antarctica
|
0636724 |
2012-05-03 | Blankenship, Donald D.; Young, Duncan A.; Holt, John W.; Kempf, Scott D. |
Collaborative Research: Synthesis of Thwaites Glacier Dynamics: Diagnostic and Prognostic Sensitivity Studies of a West Antarctic Outlet System |
This data set contains line-based radar-derived ice thickness and bed elevation data, collected as part of the Airborne Geophysical Survey of the Amundsen Embayment (AGASEA) expedition, which took place over Thwaites Glacier in West Antarctica from 2004 to 2005. The data set includes ice thickness, ice sheet bed elevation, and ice sheet surface elevation, derived from ice-penetrating radar and aircraft GPS positions. The data are spaced on a 15 km by 15 km grid over the entire catchment of the glacier, and sampled at approximately 15 meters along track. Most of the radar data used for this dataset has been processed using a 1-D focusing algorithm, to reduce the along track resolution to tens of meters, to improve boundary conditions for ice sheet models. Data are available via FTP in space-delimited ASCII format. | ["POLYGON((-125 -73,-121.5 -73,-118 -73,-114.5 -73,-111 -73,-107.5 -73,-104 -73,-100.5 -73,-97 -73,-93.5 -73,-90 -73,-90 -74,-90 -75,-90 -76,-90 -77,-90 -78,-90 -79,-90 -80,-90 -81,-90 -82,-90 -83,-93.5 -83,-97 -83,-100.5 -83,-104 -83,-107.5 -83,-111 -83,-114.5 -83,-118 -83,-121.5 -83,-125 -83,-125 -82,-125 -81,-125 -80,-125 -79,-125 -78,-125 -77,-125 -76,-125 -75,-125 -74,-125 -73))"] |
|
Antarctic Peninsula 100 m Digital Elevation Model Derived from ASTER GDEM
|
None | 2012-04-30 | Cook, Allison | No project link provided | This data set provides a 100 meter resolution surface topography Digital Elevation Model (DEM) of the Antarctic Peninsula. The DEM is based on Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model (GDEM) data. | ["POLYGON((-70 -63,-68.5 -63,-67 -63,-65.5 -63,-64 -63,-62.5 -63,-61 -63,-59.5 -63,-58 -63,-56.5 -63,-55 -63,-55 -63.7,-55 -64.4,-55 -65.1,-55 -65.8,-55 -66.5,-55 -67.2,-55 -67.9,-55 -68.6,-55 -69.3,-55 -70,-56.5 -70,-58 -70,-59.5 -70,-61 -70,-62.5 -70,-64 -70,-65.5 -70,-67 -70,-68.5 -70,-70 -70,-70 -69.3,-70 -68.6,-70 -67.9,-70 -67.2,-70 -66.5,-70 -65.8,-70 -65.1,-70 -64.4,-70 -63.7,-70 -63))"] |
|
Methane Concentrations from the WAIS Divide Ice Core (WDC06A), 60 to 11,300 ybp
|
0538538 |
2012-04-19 | Sowers, Todd A. |
Collaborative Research: Constructing an Ultra-high Resolution Atmospheric Methane Record for the Last 140,000 Years from WAIS Divide Core. |
This data set contains a high-resolution history of atmospheric methane (CH4) concentrations in parts per billion (ppb) from approximately 60 to 11,300 years before present (ybp), obtained in 2010 from the West Antarctic Ice Sheet (WAIS) Divide Ice Core WDC06A. Gas age is derived from the WDC06A-5 ice age scale. Data are available via FTP as a Microsoft Excel file (.xlsx). | ["POINT(-112.086483 -79.46763)"] |
|
Annual Layers at Siple Dome, Antarctica, from Borehole Optical Stratigraphy
|
0087521 |
2012-04-15 | Hawley, Robert L.; Waddington, Edwin D.; Alley, Richard; Taylor, Kendrick C. |
Borehole Fingerprinting: Vertical Strain, Firn Compaction, and Firn Depth-Age Scales |
Researchers gathered data on annual snow layers at Siple Dome, Antarctica, using borehole optical stratigraphy. This data set contains annual layer depths and firn optical brightness. The brightness log is a record of reflectivity of the firn, and peaks in brightness are interpreted to be fine-grained high-density winter snow, as part of the wind slab depth-hoar couplet. Data are available via FTP in ASCII text (.txt) format | ["POINT(-148.82 -81.66)"] |
|
Atmosphere-Ocean-Ice Interaction in a Coastal Polynya
|
0739464 |
2012-01-01 | Cassano, John; Maslanik, Jim |
Collaborative Research: Atmosphere-Ocean-Ice Interaction in a Coastal Polynya |
Antarctic polynyas are the ice free zones often persisting in continental sea ice. Characterization of the lower atmosphere properties, air-sea surface heat fluxes and corresponding ocean depth profiles of Antarctic polynyas, especially during strong wind events, is needed for a more detailed understanding of the role of polynya in the production of latent-heat type sea ice and the formation, through brine rejection, of dense ocean bottom waters. Broader impacts: A key technological innovation, the use of instrumented uninhabited aircraft systems (UAS), will be employed to enable the persistent and safe observation of the interaction of light and strong katabatic wind fields with the Terra Nova Bay (Victoria Land, Antarctica) polynya waters during late winter and early summer time frames. The use of UAS observational platforms on the continent to date has to date been modest, but demonstration of their versatility and effectiveness in surveying and observing mode is a welcome development. The projects use of UAS platforms by University of Colorado and LDEO (Columbia) researchers is both high risk, and potentially transformative for the systematic data measurement tasks that many Antarctic science applications increasingly require. | ["POLYGON((160 -74.5,161.5 -74.5,163 -74.5,164.5 -74.5,166 -74.5,167.5 -74.5,169 -74.5,170.5 -74.5,172 -74.5,173.5 -74.5,175 -74.5,175 -74.9,175 -75.3,175 -75.7,175 -76.1,175 -76.5,175 -76.9,175 -77.3,175 -77.7,175 -78.1,175 -78.5,173.5 -78.5,172 -78.5,170.5 -78.5,169 -78.5,167.5 -78.5,166 -78.5,164.5 -78.5,163 -78.5,161.5 -78.5,160 -78.5,160 -78.1,160 -77.7,160 -77.3,160 -76.9,160 -76.5,160 -76.1,160 -75.7,160 -75.3,160 -74.9,160 -74.5))"] |
|
GPS Ice Flow Measurements, Allan Hills, Antarctica
|
0229245 0838843 9527571 |
2011-12-20 | Kurbatov, Andrei V.; Spikes, Vandy Blue; Hamilton, Gordon S.; Spaulding, Nicole |
GPS Measurements of Rock and Ice Motions in South Victoria Land |
This data set includes includes high-precision GPS measurements of steel poles within the Allan Hills Main Ice Field, Near Western Ice Field, and extending to the eastern edge of the Middle Western Ice Field, in Antarctica. These data were collected between December 1997 and December 2010. The extended survey period allowed for vertical and horizontal velocities to be calculated with low associated error. Parameters include locations of poles in latitude and longitude, as well as elevation, ice velocity, and accumulation rates. Data are available via FTP as ASCII text files in comma separated value (.csv) format. Raw data are also provided as Trimble raw data, compressed in .zip format, and supplementary information is provided in .csv format and portable document format (.pdf). | ["POLYGON((158.25 -76.66667,158.325 -76.66667,158.4 -76.66667,158.475 -76.66667,158.55 -76.66667,158.625 -76.66667,158.7 -76.66667,158.775 -76.66667,158.85 -76.66667,158.925 -76.66667,159 -76.66667,159 -76.683336,159 -76.700002,159 -76.716668,159 -76.733334,159 -76.75,159 -76.766666,159 -76.783332,159 -76.799998,159 -76.816664,159 -76.83333,158.925 -76.83333,158.85 -76.83333,158.775 -76.83333,158.7 -76.83333,158.625 -76.83333,158.55 -76.83333,158.475 -76.83333,158.4 -76.83333,158.325 -76.83333,158.25 -76.83333,158.25 -76.816664,158.25 -76.799998,158.25 -76.783332,158.25 -76.766666,158.25 -76.75,158.25 -76.733334,158.25 -76.716668,158.25 -76.700002,158.25 -76.683336,158.25 -76.66667))"] |
|
Alkanes in Firn Air Samples, Antarctica and Greenland
|
0739598 |
2011-11-30 | Aydin, Murat; Saltzman, Eric |
Collaborative Research: Methane Isotopes, Hydrocarbons, and other Trace Gases in South Pole Firn Air |
This data set contains ethane, propane, and n-butane measurements in firn air from the South Pole and the West Antarctic Ice Sheet (WAIS) Divide in Antarctica, and from Summit, Greenland. The WAIS Divide and South Pole samples were collected in December to January of of 2005/06 and 2008/09, respectively. The Summit firn was sampled in the summer of 2006. Analyses were conducted on a gas chromatography - mass spectrometry (GC-MS) system at the University of California, Irvine. Measurements and the associated uncertainties are reported as dry air molar mixing ratios in part per trillion (ppt). The reported measurements for each sampling depth represent a mean of multiple measurements on more than one flask in most cases. Data are available via FTP in Microsoft Excel (.xls) format. | ["POINT(112.09 -79.47)", "POINT(-38.3833 72.5833)", "POINT(0 -90)"] |
|
WAIS Divide Snowpit Chemical and Isotope Measurements, Antarctica
|
0636740 |
2011-11-15 | Kreutz, Karl; Koffman, Bess |
Collaborative Research: Microparticle/tephra analysis of the WAIS Divide ice core |
This dataset includes major ion, trace element, microparticle and oxygen isotope (δ18O) data for a snowpit dug and sampled in December 2008 near the West Antarctic Ice Sheet (WAIS) Divide ice core site. The pit was dug approximately 4 km upwind from the drilling arch in the clean air sector of camp. Sampling was done using trace element clean techniques and all depths are in water equivalents. Data are available via FTP in ASCII text (.txt) format. | ["POINT(-112.3 -79.433333)"] |
|
Microparticle, Conductivity, and Density Measurements from the WAIS Divide Deep Ice Core, Antarctica
|
0636740 |
2011-10-01 | Kreutz, Karl; Hamilton, Gordon S.; Breton, Daniel; Koffman, Bess |
Collaborative Research: Microparticle/tephra analysis of the WAIS Divide ice core |
This data set includes microparticle concentration, electrical conductivity, and density measurements from the West Antarctic Ice Sheet (WAIS) Divide deep ice core, WDC06A. Microparticle concentration data are reported as total particles per ml of meltwater. Concentration was measured using a laser detector and the University of Maine WAIS Melt Monitor system. Conductivity is measured in micro-Siemens per cm (uS/cm). Density data were collected on 3 by 3 by 100 cm sticks from the WDC06A core, using the Maine Automated Density Gauge Experiment (MADGE). Density data span 0 to 160 m in depth, while the particle and conductivity measurements span the upper 577 m of the core. Data are available via FTP in ASCII text format (.txt). | ["POINT(112.088333 -79.482778)", "POINT(-112.088333 -79.482778)"] |
|
GPS-Measured Ice Velocities and Strain Data from the Ross and Amundsen Sea Ice Flow Divide, West Antarctica
|
0440847 |
2011-09-01 | Matsuoka, Kenichi; Power, Donovan; Rasmussen, Al |
Detection of Crystal Orientation Fabrics near the Ross/Amundsen Sea Ice-flow Divide and at the Siple Dome Ice Core Site using Polarimetric Radar Methods |
This data set includes ice flow velocities and strain configurations, from GPS measurements on the West Antarctic Ice Sheet (WAIS) Divide. Ninety markers installed in the firn were measured during two consecutive field seasons running from 2005-2006 and 2006-2007. The markers were located in 150 by 60 km area, with smaller clusters of five markers located within about 10 km of each other. Consecutive GPS measurements were used to derive velocity for each marker. Strain configurations were estimated by differentiating a linear fit of the data at each marker cluster. Data are available via FTP as ASCII text (.txt ) files in comma separated value format. | ["POLYGON((-115.457 -78.7489,-114.8241 -78.7489,-114.1912 -78.7489,-113.5583 -78.7489,-112.9254 -78.7489,-112.2925 -78.7489,-111.6596 -78.7489,-111.0267 -78.7489,-110.3938 -78.7489,-109.7609 -78.7489,-109.128 -78.7489,-109.128 -78.83802,-109.128 -78.92714,-109.128 -79.01626,-109.128 -79.10538,-109.128 -79.1945,-109.128 -79.28362,-109.128 -79.37274,-109.128 -79.46186,-109.128 -79.55098,-109.128 -79.6401,-109.7609 -79.6401,-110.3938 -79.6401,-111.0267 -79.6401,-111.6596 -79.6401,-112.2925 -79.6401,-112.9254 -79.6401,-113.5583 -79.6401,-114.1912 -79.6401,-114.8241 -79.6401,-115.457 -79.6401,-115.457 -79.55098,-115.457 -79.46186,-115.457 -79.37274,-115.457 -79.28362,-115.457 -79.1945,-115.457 -79.10538,-115.457 -79.01626,-115.457 -78.92714,-115.457 -78.83802,-115.457 -78.7489))"] |
|
Polarimetric Radar Data from the Ross and Amundsen Sea Ice Flow Divide, West Antarctica
|
0440847 |
2011-08-30 | Matsuoka, Kenichi; Power, Donovan; Fujita, Shuji; Raymond, Charles |
Detection of Crystal Orientation Fabrics near the Ross/Amundsen Sea Ice-flow Divide and at the Siple Dome Ice Core Site using Polarimetric Radar Methods |
This dataset contains ground-based, co-polarized radar data collected using pulse-modulated 60 MHz and 179 MHz radar at 19 sites around a deep ice coring site near the Ross and Amundsen flow divide of West Antarctic Ice Sheet (WAIS Divide). At each site, the radar data were collected at 12 orientations of the radar polarization plane for three radar pulse widths: 250 nsec, 500 nsec, and 1000 nsec. Useful signals were received from depths roughly between 200 m and 2000 m. Ice flow velocities and strain configurations were measured at most of these radar survey sites, and these ice motion data are also provided at NSIDC (GPS-Measured Ice Velocities and Strain Data from the Ross and Amundsen Sea Ice Flow Divide, West Antarctica). Data are available via FTP in MATLAB (.mat) format. | ["POLYGON((-115.457 -78.7489,-114.8241 -78.7489,-114.1912 -78.7489,-113.5583 -78.7489,-112.9254 -78.7489,-112.2925 -78.7489,-111.6596 -78.7489,-111.0267 -78.7489,-110.3938 -78.7489,-109.7609 -78.7489,-109.128 -78.7489,-109.128 -78.83802,-109.128 -78.92714,-109.128 -79.01626,-109.128 -79.10538,-109.128 -79.1945,-109.128 -79.28362,-109.128 -79.37274,-109.128 -79.46186,-109.128 -79.55098,-109.128 -79.6401,-109.7609 -79.6401,-110.3938 -79.6401,-111.0267 -79.6401,-111.6596 -79.6401,-112.2925 -79.6401,-112.9254 -79.6401,-113.5583 -79.6401,-114.1912 -79.6401,-114.8241 -79.6401,-115.457 -79.6401,-115.457 -79.55098,-115.457 -79.46186,-115.457 -79.37274,-115.457 -79.28362,-115.457 -79.1945,-115.457 -79.10538,-115.457 -79.01626,-115.457 -78.92714,-115.457 -78.83802,-115.457 -78.7489))"] |
|
Modeled Radar Attenuation Rate Profile at the Vostok 5G Ice Core Site, Antarctica
|
0538674 |
2011-08-15 | Macgregor, Joseph A.; Matsuoka, Kenichi; Studinger, Michael S. |
Collaborative Research: Deciphering the Deep Ice and the Ice-water Interface over Lake Vostok Using Existing Radar Data |
This data set provides a modeled radar attenuation rate profile, showing the predicted contributions from pure ice and impurities to radar attenuation at the Vostok 5G ice core site in Antarctica, as well as the total attenuation rate and its formal uncertainty. The model data are based on borehole temperature logs, concentrations of major soluble ions measured from melted ice core samples, and information about the electrical conductivity of ice. Attenuation rates and their spatial variability are important constraints for radar studies of ice sheets. Parameters include depth, total attenuation rate, and attenuation rate contribution from pure ice, acidity, and salinity. Data are available via FTP as a text file (.txt) with columns in comma separated value format. | ["POINT(73.17 -78.47)"] |
|
Millennially Averaged Accumulation Rates for Lake Vostok
|
0538674 |
2011-08-01 | Macgregor, Joseph A.; Matsuoka, Kenichi; Studinger, Michael S.; Waddington, Edwin D.; Winebrenner, Dale |
Collaborative Research: Deciphering the Deep Ice and the Ice-water Interface over Lake Vostok Using Existing Radar Data |
This data set consists of inferred accumulation rates from three radar layers (26, 35 and 41 thousand years old) in the Vostok Subglacial Lake region. Accumulation rates were inferred using Local-Layer Approximation (LLA), which assumes that the strain-rate history of a particle traveling through the ice sheet can be approximated by the vertical strain-rate profile at the current position of the particle, which the researchers assume to be uniform. Parameters include location, in latitude and longitude, polar stereographic coordinates, and local grid X and Y coordinates, along with layer age, in thousands of years (ka), and inferred accumulation rate (cm/a). The data cover a 150 by 350 km area. Data are available via FTP, as a text file (.txt) with columns in comma separated value format. | ["POLYGON((68.4 -75.7,69.61 -75.7,70.82 -75.7,72.03 -75.7,73.24 -75.7,74.45 -75.7,75.66 -75.7,76.87 -75.7,78.08 -75.7,79.29 -75.7,80.5 -75.7,80.5 -76.04,80.5 -76.38,80.5 -76.72,80.5 -77.06,80.5 -77.4,80.5 -77.74,80.5 -78.08,80.5 -78.42,80.5 -78.76,80.5 -79.1,79.29 -79.1,78.08 -79.1,76.87 -79.1,75.66 -79.1,74.45 -79.1,73.24 -79.1,72.03 -79.1,70.82 -79.1,69.61 -79.1,68.4 -79.1,68.4 -78.76,68.4 -78.42,68.4 -78.08,68.4 -77.74,68.4 -77.4,68.4 -77.06,68.4 -76.72,68.4 -76.38,68.4 -76.04,68.4 -75.7))"] |
|
MOA-derived Structural Feature Map of the Ronne Ice Shelf
|
0125754 0440670 |
2011-07-15 | Hulbe, Christina; Ledoux, Christine |
Collaborative Research: Using Fracture Patterns and Ice Thickness to Study the History and Dynamics of Grounding Line Migration and Shutdown of Kamb and Whillans Ice Streams |
This data set provides a structural feature map of the Ronne Ice Shelf in Antarctica (also known as the Filchner-Ronne Ice Shelf). The map was developed as part of a project to study fracture propagation in the Ronne Ice Shelf, with special focus on the Evans Ice Stream. Features were digitized from the MODIS Mosaic of Antartica (MOA), a composite of individual Moderate Resolution Imaging Spectradiometer (MODIS) images taken between 20 November 2003 and 29 February 2004, with an effective resolution of 125 m. The data set includes estimates of the shelf boundary, including ice stream grounding zones, outlets of glaciers feeding the shelf, extents of islands and ice rises, and the location of the shelf front, and features observed within the shelf, including suture zones between ice streams, streaklines, fractures (crevasses and rifts), and fold-like features. Individual features can be extracted as a group of points and grouping is used to facilitate identification and plotting. Data files are available via FTP in ASCII text (.txt) format. One image file, in Portable Document Format (.pdf), shows the data included in the dataset, plotted using MATLAB. The data set also provides a MATLAB script which can be used to plot the data. | ["POLYGON((-86.557 -74.355,-80.5124 -74.355,-74.4678 -74.355,-68.4232 -74.355,-62.3786 -74.355,-56.334 -74.355,-50.2894 -74.355,-44.2448 -74.355,-38.2002 -74.355,-32.1556 -74.355,-26.111 -74.355,-26.111 -75.3874,-26.111 -76.4198,-26.111 -77.4522,-26.111 -78.4846,-26.111 -79.517,-26.111 -80.5494,-26.111 -81.5818,-26.111 -82.6142,-26.111 -83.6466,-26.111 -84.679,-32.1556 -84.679,-38.2002 -84.679,-44.2448 -84.679,-50.2894 -84.679,-56.334 -84.679,-62.3786 -84.679,-68.4232 -84.679,-74.4678 -84.679,-80.5124 -84.679,-86.557 -84.679,-86.557 -83.6466,-86.557 -82.6142,-86.557 -81.5818,-86.557 -80.5494,-86.557 -79.517,-86.557 -78.4846,-86.557 -77.4522,-86.557 -76.4198,-86.557 -75.3874,-86.557 -74.355))"] |
|
Grounding Line Strain Grid Surveys, Kamb Ice Stream, Antarctica
|
0538015 |
2011-07-01 | Hulbe, Christina |
Collaborative Research: Grounding Line Forensics: The History of Grounding Line Retreat in the Kamb Ice Stream Outlet Region |
This data set provides the results from a strain grid survey deployed across the Kamb Ice Stream grounding line on the West Antarctic Ice Sheet. The grid was deployed in 2006 and resurveyed in 2007 using a Global Positioning System (GPS). Parameters measured include latitude, longitude, and height of each survey mark in the strain grid, as well as northing, easting, elevations, and displacement of each point during the year between surveys. Data are available via FTP in Microsoft Excel (.xls) format. | ["POLYGON((154.71 -82.78,154.79 -82.78,154.87 -82.78,154.95 -82.78,155.03 -82.78,155.11 -82.78,155.19 -82.78,155.27 -82.78,155.35 -82.78,155.43 -82.78,155.51 -82.78,155.51 -82.788,155.51 -82.796,155.51 -82.804,155.51 -82.812,155.51 -82.82,155.51 -82.828,155.51 -82.836,155.51 -82.844,155.51 -82.852,155.51 -82.86,155.43 -82.86,155.35 -82.86,155.27 -82.86,155.19 -82.86,155.11 -82.86,155.03 -82.86,154.95 -82.86,154.87 -82.86,154.79 -82.86,154.71 -82.86,154.71 -82.852,154.71 -82.844,154.71 -82.836,154.71 -82.828,154.71 -82.82,154.71 -82.812,154.71 -82.804,154.71 -82.796,154.71 -82.788,154.71 -82.78))"] |
|
Methane Concentration and Chronology from the WAIS Divide Ice Core (WDC05A)
|
0538538 0538427 0739780 0520523 0538578 |
2011-05-27 | McConnell, Joseph; Brook, Edward J.; Mitchell, Logan E; Sowers, Todd A.; Taylor, Kendrick C. |
Collaborative Research: Gases in Firn Air and Shallow Ice at the Proposed WAIS Divide Drilling Site |
This data set provides a high-precision and high-resolution record of atmospheric methane from the West Antarctic Ice Sheet (WAIS) Divide ice core WDC05A, spanning the years 1000 to 1800 C.E. The data include methane (CH4) concentration measurements and ice age chronology. Methane concentration data include mean sample depth, gas age, mean concentration, and concentrations from individual measurements, at a temporal resolution of approximately nine years. Ice chronology data include depth and ice age. Data are available via FTP, in Microsoft Excel (.xlsx) format. | ["POINT(112.09 -79.47)"] |
|
High-resolution Image-derived Grounding and Hydrostatic Lines for the Antarctic Ice Sheet
|
None | 2011-02-20 | Bindschadler, Robert; Choi, Hyeungu | No project link provided | This data set provides grounding line and hydrostatic line locations for the Antarctic coastline and islands around Antarctica. The data are derived using customized software to combine data from Landsat-7 imagery and Ice, Cloud, and land Elevation Satellite (ICESat) laser altimetry, which were primarily collected between 1999 to 2003. The data set also includes elevations along each line, selected from six candidate digital elevation models. The data were developed as part of the Antarctic Surface Accumulation and Ice Discharge (ASAID) project. Data are available via FTP, provided in both ASCII text (.txt) and shapefile (.shp, .dbf, .shx) formats. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -62,180 -64,180 -66,180 -68,180 -70,180 -72,180 -74,180 -76,180 -78,180 -80,144 -80,108 -80,72 -80,36 -80,0 -80,-36 -80,-72 -80,-108 -80,-144 -80,-180 -80,-180 -78,-180 -76,-180 -74,-180 -72,-180 -70,-180 -68,-180 -66,-180 -64,-180 -62,-180 -60))"] |
|
Climate, Drift, and Image Data from Antarctic Icebergs A22A and UK211, 2006-2007
|
0540915 |
2011-01-31 | Scambos, Ted; Bohlander, Jennifer; Bauer, Rob; Yermolin, Yevgeny; Thom, Jonathan |
Investigating Iceberg Evolution During Drift and Break-Up: A Proxy for Climate-Related Changes in Antarctic Ice Shelves |
This data set includes a variety of station data from two Antarctic icebergs. In 2006, researchers installed specialized weather stations called Automated Meteorological Ice Geophysical Observing Stations (AMIGOS) on two icebergs, A22A and UK211 (nicknamed Amigosberg), near Marambio Station in Antarctica.The AMIGOS stations were outfitted with Global Positioning System (GPS) sensors, cameras, and an electronic thermometer. They collected data from their installation in March 2006 until the icebergs crumbled into the ocean, in 2006 (Amigosberg) and 2007 (A22A). Available data include GPS, temperature and ablation measurements, and photographs of the station base and of flag lines extending out to the edges of the icebergs. Snow pit data from iceberg A22A is also included. This data set was collected as part of a National Science Foundation Office of Polar Programs Special Grant for Exploratory Research, to explore the possibility of using drfting icebergs to investigate ice shelf evolution caused by climate change. The expedition, nicknamed IceTrek, was conducted jointly with Argentine scientists. The data are available via FTP in ASCII text (.txt) and Joint Photographic Experts Group (.jpg) formats. | ["POLYGON((-60 -47,-55.5 -47,-51 -47,-46.5 -47,-42 -47,-37.5 -47,-33 -47,-28.5 -47,-24 -47,-19.5 -47,-15 -47,-15 -50.3,-15 -53.6,-15 -56.9,-15 -60.2,-15 -63.5,-15 -66.8,-15 -70.1,-15 -73.4,-15 -76.7,-15 -80,-19.5 -80,-24 -80,-28.5 -80,-33 -80,-37.5 -80,-42 -80,-46.5 -80,-51 -80,-55.5 -80,-60 -80,-60 -76.7,-60 -73.4,-60 -70.1,-60 -66.8,-60 -63.5,-60 -60.2,-60 -56.9,-60 -53.6,-60 -50.3,-60 -47))"] |
|
Controls on Climate-Active Gases by Amundsen Sea Ice Biota
|
0836061 |
2011-01-01 | Dennett, Mark |
Collaborative Research: Controls on climate-active gases by Amundsen Sea ice biota |
Convincing evidence now confirms that polar regions are changing rapidly in response to human activities. Changes in sea ice extent and thickness will have profound implications for productivity, food webs and carbon fluxes at high latitudes, since sea ice biota are a significant source of biogenic matter for the ecosystem. While sea ice is often thought to be a barrier to gas exchange between the ocean and the atmosphere, it more likely functions as a source or sink for climate-active gases such as carbon dioxide and ozone-depleting organohalogens, due in part to activities of microbes embedded in the sea ice matrix. This project brings together experienced US and Swedish investigators to examine the controls by sea-ice biota on the production and degradation of key climate-active gases in the Pacific sector of the Southern Ocean. We hypothesize that 1) the physical properties of the sea-ice environment will determine the community structure and activities of the sea ice biota; 2) the productivity, biomass, physiological state and species composition of ice algae will determine the production of specific classes of organic carbon, including organohalogens; 3) heterotrophic co-metabolism within the ice will break down these compounds to some extent, depending on the microbial community structure and productivity, and 4) the sea ice to atmosphere fluxes of CO2 and organohalogens will be inversely related. This project will build close scientific collaborations between US and Swedish researchers and also train young scientists, including members of underrepresented groups. Dissemination of results will include the scientific literature, and public outreach venues including interactions with a PolarTrec teacher. | ["POLYGON((-170 -69,-163 -69,-156 -69,-149 -69,-142 -69,-135 -69,-128 -69,-121 -69,-114 -69,-107 -69,-100 -69,-100 -70,-100 -71,-100 -72,-100 -73,-100 -74,-100 -75,-100 -76,-100 -77,-100 -78,-100 -79,-107 -79,-114 -79,-121 -79,-128 -79,-135 -79,-142 -79,-149 -79,-156 -79,-163 -79,-170 -79,-170 -78,-170 -77,-170 -76,-170 -75,-170 -74,-170 -73,-170 -72,-170 -71,-170 -70,-170 -69))"] |
|
Free Drifting Icebergs as Proliferation Sites of Iron Enrichment, Organic Carbon Production and Export in the Southern Ocean
|
0636319 |
2011-01-01 | Shaw, Tim; Twining, Benjamin |
Collaborative Research: Free Drifting Icebergs as Proliferation Sites of Iron Enrichment, Organic Carbon Production and Export in the Southern Ocean |
Atmospheric warming has been associated with retreating glaciers, disintegrating ice shelves, and the increasing prevalence of icebergs in the Southern Ocean over the last decade. Our preliminary study of two icebergs in the NW Weddell Sea, an area of high iceberg concentration, showed significant delivery of terrestrial material accompanied by significant enhancement of phytoplankton and zooplankton/micronekton abundance, and primary production surrounding the icebergs. We hypothesize that nutrient enrichment by free-drifting icebergs will increase primary production and sedimentation of organic carbon, thus increasing the draw-down and sequestration of CO2 in the Southern Ocean and impacting the global carbon cycle. Our research addresses the following questions:1) What is the relationship between the physical dynamics of free-drifting icebergs and the Fe and nutrient distributions of the surrounding water column? 2) What is the relationship between Fe and nutrient distributions associated with free-drifting icebergs and the organic carbon dynamics of the ice-attached and surrounding pelagic communities (microbes, zooplankton, micronekton)? 3) What is impact on the export flux of particulate organic carbon from the mixed layer? An interdisciplinary approach is proposed to examine iceberg structure and dynamics, biogeochemical processes, and carbon cycling that includes measurement of trace element, nutrient and radionuclide distributions; organic carbon dynamics mediated by microbial, ice-attached and zooplankton communities; and particulate organic carbon export fluxes. Results from this project will further our understanding of the relationship between climate change and carbon sequestration in the Southern Ocean. Our findings will be incorporated into the Antarctic Research division of the Ocean Exploration Center (OEC) as part of the SIOExplorer: Digital Library Project. The OEC allows users to access content, which is classified to one of four levels: entry (grade K-6), student (grade 6-12), college, and research. Graduate students, undergraduates, teachers, and volunteers are important participants in the proposed field and laboratory work. For the K-12 level, a professional writer of children's books will participate in cruises to produce an account of the expedition and a daily interactive website. | ["POLYGON((-51.9201 -57.5061,-50.99447 -57.5061,-50.06884 -57.5061,-49.14321 -57.5061,-48.21758 -57.5061,-47.29195 -57.5061,-46.36632 -57.5061,-45.44069 -57.5061,-44.51506 -57.5061,-43.58943 -57.5061,-42.6638 -57.5061,-42.6638 -58.03449,-42.6638 -58.56288,-42.6638 -59.09127,-42.6638 -59.61966,-42.6638 -60.14805,-42.6638 -60.67644,-42.6638 -61.20483,-42.6638 -61.73322,-42.6638 -62.26161,-42.6638 -62.79,-43.58943 -62.79,-44.51506 -62.79,-45.44069 -62.79,-46.36632 -62.79,-47.29195 -62.79,-48.21758 -62.79,-49.14321 -62.79,-50.06884 -62.79,-50.99447 -62.79,-51.9201 -62.79,-51.9201 -62.26161,-51.9201 -61.73322,-51.9201 -61.20483,-51.9201 -60.67644,-51.9201 -60.14805,-51.9201 -59.61966,-51.9201 -59.09127,-51.9201 -58.56288,-51.9201 -58.03449,-51.9201 -57.5061))"] |
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Methane Isotopes in South Pole Firn Air, 2008
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0739491 |
2011-01-01 | Sowers, Todd A. |
Collaborative Research: Methane Isotopes, Hydrocarbons, and other Trace Gases in South Pole Firn Air |
This data set contains depth profiles for delta carbon-13 (δ13C) and delta deuterium (δD) of methane (CH<sub>4</sub>) in South Pole firn air. The investigators obtained air samples from two boreholes during December 2008 and January 2009, and subsequently determined isotope ratios at 18 depths. The profiles represent a roughly 100-year history of the isotopic composition of CH<sub>4</sub> at South Pole Station (no depth-age model provided). Data are available via FTP as an ASCII text file (.txt) and a Microsoft Excel file (.xlsx). | ["POLYGON((-180 90,-144 90,-108 90,-72 90,-36 90,0 90,36 90,72 90,108 90,144 90,180 90,180 72,180 54,180 36,180 18,180 0,180 -18,180 -36,180 -54,180 -72,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -72,-180 -54,-180 -36,-180 -18,-180 0,-180 18,-180 36,-180 54,-180 72,-180 90))"] |
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The Dynamic Coupling among Phytoplankton, Ice, Ice Algae and Krill (PIIAK)
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0529666 |
2011-01-01 | Fritsen, Christian |
Collaborative Research: U.S. SO GLOBEC Synthesis and Modeling: Timing is Everything: The Dynamic Coupling among Phytoplankton, Ice, Ice Algae and Krill (PIIAK) |
This collaborative study between the Desert Research Institute, the University of California, Santa Barbara (0529087; Robin Ross), and the University of California, San Diego (0528728; Maria Vernet) will examine the relationship between sea ice extent along the Antarctic Peninsula and |