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74 record(s) found

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Dataset Title/Abstract/Map	NSF Award(s)	Date Created	PIs / Scientists	Project Links	Abstract	Geometry
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))"]
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)"]
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))"]
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)"]
Stable Isotopes of Ice in the Transition and Glacial Sections of the WAIS Divide Deep Ice Core	1043167	2020-04-08	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	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)"]
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)"]
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)"]
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	1142646 1141839 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)"]
Last Interglacial Mean Ocean Temperature	1245659 1245821 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))"]
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 1443424 1443585 1443386	2019-09-24	Emslie, Steve	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))"]
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)"]
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)"]
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)"]
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)"]
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)"]
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)"]
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))"]
Geophysical data from Crary Ice Rise, Ross Sea Embayment	1443552 1443356	2019-05-20	Conway, Howard	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))"]
Taylor Glacier Noble Gases - Younger Dryas	1245659 1245821 0739766 1246148	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))"]
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))"]
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))"]
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))"]
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))"]
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))"]
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)"]
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))"]
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)"]
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))"]
Stable water isotope data for the surface samples collected 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 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)"]
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))"]
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)"]
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))"]
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))"]
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)"]
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))"]
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))"]
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)"]
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)"]
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(-38.3833 72.5833)", "POINT(0 -90)", "POINT(112.09 -79.47)"]
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)"]
Methane Isotopes in South Pole Firn Air, 2008	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))"]
Snow Accumulation and Snow Melt in a Mixed Northern Hardwood-Conifer Forest	0338008	2010-01-01	Wemple, Beverley C.	Collaborative Research: Laboratory Studies of Isotopic Exchange in Snow and Firn	This data set contains snow depth, Snow Water Equivalent (SWE), and forest cover characteristics for sites at the Hubbard Brook Experimental Forest in northern New Hampshire. Measurements were made at 26 sampling sites on 4 March and 1 April 2009.The data were collected as part of a collaborative research project on isotopic exchange in snow. The project aims to develop a quantitative understanding of the processes active in isotopic exchange between snow/firn and water vapor, which is important to Antarctic ice core interpretation. Data are in Microsoft Excel (.xls) format. The data set also includes maps showing site locations in Joint Photography Experts Group (.jpg) format.	["POLYGON((-71.77 43.96,-71.766 43.96,-71.762 43.96,-71.758 43.96,-71.754 43.96,-71.75 43.96,-71.746 43.96,-71.742 43.96,-71.738 43.96,-71.734 43.96,-71.73 43.96,-71.73 43.955,-71.73 43.95,-71.73 43.945,-71.73 43.94,-71.73 43.935,-71.73 43.93,-71.73 43.925,-71.73 43.92,-71.73 43.915,-71.73 43.91,-71.734 43.91,-71.738 43.91,-71.742 43.91,-71.746 43.91,-71.75 43.91,-71.754 43.91,-71.758 43.91,-71.762 43.91,-71.766 43.91,-71.77 43.91,-71.77 43.915,-71.77 43.92,-71.77 43.925,-71.77 43.93,-71.77 43.935,-71.77 43.94,-71.77 43.945,-71.77 43.95,-71.77 43.955,-71.77 43.96))"]
Laboratory Studies of Isotopic Exchange in Snow	0338008	2010-01-01	Neumann, Thomas A.	Collaborative Research: Laboratory Studies of Isotopic Exchange in Snow and Firn	This data set contains sublimation rate data from laboratory studies of snow. Parameters include flow rate, measured sublimation rate, and theoretical maximum sublimation rate. Data were collected in cold rooms at the Cold Regions Research and Engineering Laboratory (CRREL), in Hanover, NH, during 2005 and 2006. The data were collected as part of a collaborative research project. The project aims to develop a quantitative understanding of the processes active in isotopic exchange between snow/firn and water vapor, which is important to Antarctic ice core interpretation. Data are available via FTP in Microsoft Excel (.xls) format.	["POINT(-72 43)"]
Gases in Firn Air and Shallow Ice at the WAIS Drilling Site, Antarctica	0440602	2009-07-30	Saltzman, Eric	Collaborative Research: Gases in Firn Air and Shallow Ice at the Proposed WAIS Divide Drilling Site	This data set contains trace gas measurements of air extracted from ice core samples from the West Antarctic Ice Sheet Divide A core (WAIS-D 05A). The WAIS A core was dry-drilled at the WAIS site during the 2005-2006 Antarctic field season. Data include trace gas species including ethane (C2H6), propane (C3H8), n-butane (n-C4H10), carbonyl sulfide (COS), carbon disulfide (CS2), methyl chloride (CH3Cl), methyl bromide (CH3Br), acetonitrile (CH3CN), and chlorofluorocarbon-12 (CFC-12), for 57 ice core samples. The data are available via FTP in Microsoft Excel (.xls) file format.	["POINT(112.09 -79.47)"]
Ross Ice Shelf Firn Temperature, Antarctica	0229546	2008-12-15	Scambos, Ted; Muto, Atsu; Sergienko, Olga; MacAyeal, Douglas	Collaborative Research of Earth's Largest Icebergs	Since November of 2006, 12 thermistors were planted in the upper 16 meters of the firn on the Ross Ice Shelf near its calving front. Temperature data are collected every 20 minutes and are transmitted via ARGOS satellite relay. Data are intended to provide a view of how firn temperatures change as the ice shelf evolves. Data are available in comma-delimited ASCII format. Data are available via FTP.	["POINT(-178 -78)"]
Iceberg Firn Temperatures, Antarctica	0229546	2008-11-28	Thom, Jonathan; Sergienko, Olga; MacAyeal, Douglas	Collaborative Research of Earth's Largest Icebergs	Since November of 2005, 12 thermistors were planted in the upper 2.5 meters of the firn on iceberg C16, Antarctica. Temperature data are collected every 20 minutes and are transmitted via ARGOS satellite relay. Data are intended to provide a view of how firn temperatures change as an iceberg moves north into warmer climate.	["POINT(168 -78)"]
Snow and Firn Permeability: Characteristics of Snow Megadunes and their Potential Effects on Ice Core Interpretation	0125276	2007-11-01	Albert, Mary R.; Courville, Zoe; Cathles, Mac	Collaborative Research: Characteristics of Snow Megadunes and Their Potential Effect on Ice Core Interpretation	This data set contains firn physical properties measured in two meter snow pits and from deeper, 12- to 30-meter firn cores. The physical properties measured in the snow pits include density, permeability and microstructure (grain size and pore size). The physical properties measured on firn cores include density, permeability, diffusivity and microstructure. Data are available in Microsoft Excel format and ADOBE PDF and are available via FTP.	["POLYGON((124.0218 -80.5304,124.22264 -80.5304,124.42348 -80.5304,124.62432 -80.5304,124.82516 -80.5304,125.026 -80.5304,125.22684 -80.5304,125.42768 -80.5304,125.62852 -80.5304,125.82936 -80.5304,126.0302 -80.5304,126.0302 -80.55538,126.0302 -80.58036,126.0302 -80.60534,126.0302 -80.63032,126.0302 -80.6553,126.0302 -80.68028,126.0302 -80.70526,126.0302 -80.73024,126.0302 -80.75522,126.0302 -80.7802,125.82936 -80.7802,125.62852 -80.7802,125.42768 -80.7802,125.22684 -80.7802,125.026 -80.7802,124.82516 -80.7802,124.62432 -80.7802,124.42348 -80.7802,124.22264 -80.7802,124.0218 -80.7802,124.0218 -80.75522,124.0218 -80.73024,124.0218 -80.70526,124.0218 -80.68028,124.0218 -80.6553,124.0218 -80.63032,124.0218 -80.60534,124.0218 -80.58036,124.0218 -80.55538,124.0218 -80.5304))"]
Carbon-13 Isotopic Composition of Atmospheric Methane in Firn Air, South Pole and Siple Dome, Antarctica	9526556	2007-07-09	Sowers, Todd A.	Constructing Paleoatmospheric Records of the Isotopic Composition of Methane and Nitrous Oxide	This data set includes records of the delta carbon-13 (δ<sup>13</sup>C) of methane (CH<sub>4</sub>) in firn air from the South Pole and trapped in bubbles in a short ice core from Siple Dome, Antarctica. Using two firn air samples, one from January 1995 and the other from January 2001, investigators reconstructed records of the isotopic composition of paleoatmospheric methane covering the last 2 centuries, from 1820 to 2001. Data are in Microsoft Excel and Microsoft Word formats and are available via FTP.	["POINT(-148.3023 -81.403)"]
Atmospheric Nitrate Isotopic Analysis at Amundsen-Scott South Pole Station, A Twenty-Five Year Record	0125761	2006-11-01	Thiemens, Mark H.; Savarino, Joel	South Pole Atmospheric Nitrate Isotopic Analysis (SPANIA)	This data set contains snow pit measurements of oxygen isotopes, <sup>17</sup>O and <sup>18</sup>O, in nitrate and ion concentrations, and surface measurements of oxygen isotopes in nitrate and in nitrate aerosols from the Amundsen-Scott South Pole Station, Antarctica. The 6-meter snow pit provides investigators with a 25-year record of nitrate isotope variations and ion concentrations for a period spanning from 1979 to 2004. Monthly surface snow and weekly aerosol collections yield a year-long record of nitrate isotopic composition starting 01 December 2003 and ending 31 December 2004. Little is known about the past denitrification of the stratosphere in high latitude regions. Such knowledge is important to understanding the chemical state of the ancient atmospheres and evaluating the present climate models. With this research, investigators aim to understand the denitrification of the Antarctic stratosphere and quantify the sources of nitrate aerosols over time. Data are in Microsoft Excel format and are available via FTP.	["POINT(139.2728 -89.9975)"]
AWS Data: Characteristics of Snow Megadunes and Their Potential Effect on Ice Core Interpretation	0125570 0225992	2006-10-05	Fahnestock, Mark; Scambos, Ted; Haran, Terry; Bauer, Rob	Collaborative Research: Characteristics of Snow Megadunes and Their Potential Effect on Ice Core Interpretation	The Antarctic megadune research was conducted during two field seasons, one in November 2002 and the other during the period of December 2003 through January 2004. The megadune field site is located on the East Antarctic Plateau, southeast of Vostok station. The objectives of this multi-facetted research are 1) to determine the physical characteristics of the firn across the dunes including typical climate indicators such as stable isotopes and major chemical species and 2) to install instruments to measure the time variation of near-surface wind and temperature with depth, to test and refine hypotheses for megadune formation. It is important to improve our current understanding of the megadunes because of their extreme nature, their broad extent, and their potential impact on the climate record. Megadunes are a manifestation of an extreme terrestrial climate and may provide insight on the past terrestrial climate or on processes active on other planets. Snow megadunes are undulating variations in accumulation and surface texture with wavelengths of 2 to 5 km and amplitudes up to 5 meters. The features cover 500,000 km<sup>2</sup> of the East Antarctic plateau, occurring in areas of moderate regional slope and low accumulation on the flanks of the ice sheet between 2500 and 3800 meters elevation. Landsat images and aerial photography indicate the dunes consist of alternating surfaces of glaze and rough sastrugi, with gradational boundaries. This pattern is oriented perpendicular to the mean wind direction, as modeled in katabatic wind studies. Glazed surfaces cover the leeward faces and troughs; rough sastrugi cover the windward faces and crests. The megadune pattern is crossed by smooth to eroded wind-parallel longitudinal dunes. Wind-eroded longitudinal dunes form spectacular 1-meter-high sastrugi in nearby areas. This data set contains automated weather station (AWS) data from two sites. The Mac site was oriented on the rough sastrugi-covered windward face and the Zoe site was on the glazed leeward face. The AWSs collected data throughout the year from 16 January 2004 to 17 November 2004. Investigators received data from the two field sites via the ARGOS Satellite System (http://www.argosinc.com/). Data are provided in space-delimited ASCII text format and are available via FTP.	["POLYGON((124.4345 -80.77546,124.443718 -80.77546,124.452936 -80.77546,124.462154 -80.77546,124.471372 -80.77546,124.48059 -80.77546,124.489808 -80.77546,124.499026 -80.77546,124.508244 -80.77546,124.517462 -80.77546,124.52668 -80.77546,124.52668 -80.776922,124.52668 -80.778384,124.52668 -80.779846,124.52668 -80.781308,124.52668 -80.78277,124.52668 -80.784232,124.52668 -80.785694,124.52668 -80.787156,124.52668 -80.788618,124.52668 -80.79008,124.517462 -80.79008,124.508244 -80.79008,124.499026 -80.79008,124.489808 -80.79008,124.48059 -80.79008,124.471372 -80.79008,124.462154 -80.79008,124.452936 -80.79008,124.443718 -80.79008,124.4345 -80.79008,124.4345 -80.788618,124.4345 -80.787156,124.4345 -80.785694,124.4345 -80.784232,124.4345 -80.78277,124.4345 -80.781308,124.4345 -80.779846,124.4345 -80.778384,124.4345 -80.776922,124.4345 -80.77546))"]
Firn Air Inert Gas and Oxygen Observations from Siple Dome, 1996, and the South Pole, 2001	0230452 9725305 0230260	2006-08-17	Severinghaus, Jeffrey P.; Battle, Mark; Bender, Michael	Collaborative Research: Trapped Gas Composition and the Chronology of the Vostok Ice Core	This data set includes gas ratios in polar firn air: O<sub>2</sub>/N<sub>2</sub>, <sup>15</sup>N/<sup>14</sup>N, <sup>40</sup>Ar/N<sub>2</sub>, <sup>40</sup>Ar/<sup>36</sup>Ar, <sup>40</sup>Ar/<sup>38</sup>Ar, <sup>84</sup>Kr/<sup>36</sup>Ar, <sup>132</sup>Xe/<sup>36</sup>Ar, and <sup>22</sup>Ne/<sup>36</sup>Ar. Investigators sampled air from the permeable snowpack (firn) layer at two sites: Siple Dome, Antarctica in 1996 and at the South Pole in 2001. They observed and modeled the processes of gravitational settling, thermal fractionation, and preferential exclusion of small gas molecules from closed air bubbles. The purpose of this study was to understand these physical processes, which affect the composition of bubbles trapped in ice. By measuring these gas ratios in the ancient air preserved in bubbles trapped in ice, researchers can determine past atmospheric composition and local temperature changes along with the relative timing and magnitude of such events. The data file is available in Microsoft Excel format. The research paper is available in PDF. Data and the research paper are available via FTP.	["POINT(0 -90)", "POINT(-148.767 -80.667)"]
GPR and GPS Data: Characteristics of Snow Megadunes and their Potential Effects on Ice Core Interpretation	0125276	2006-06-10	Scambos, Ted; Bauer, Rob	Collaborative Research: Characteristics of Snow Megadunes and Their Potential Effect on Ice Core Interpretation	The Antarctic megadune research was conducted during two field seasons, one in November 2002 and the other in December 2003 through January 2004. The megadune field site is located on the East Antarctic Plateau, southeast of Vostok station. The objectives of this multi-facetted research are to determine the physical characteristics of the firn across the dunes including typical climate indicators such as stable isotopes and major chemical species and to install instruments to measure the time variation of near-surface wind and temperature with depth, to test and refine hypotheses for megadune formation. It is important to improve our current understanding of the megadunes because of their extreme nature, their broad extent, and their potential impact on the climate record. Megadunes are a manifestation of an extreme terrestrial climate and may provide insight on past terrestrial climate or on processes active on other planets. Snow megadunes are undulating variations in accumulation and surface texture with wavelengths of 2 to 5 km and amplitudes up to 5 meters. The features cover 500,000 km<sup>2</sup> of the East Antarctic plateau, occurring in areas of moderate regional slope and low accumulation on the flanks of the ice sheet between 2500 and 3800 meters elevation. Landsat images and aerial photography indicate the dunes consist of alternating surfaces of glaze and rough sastrugi, with gradational boundaries. This pattern is oriented perpendicular to the mean wind direction, as modeled in katabatic wind studies. Glaze surfaces cover the leeward faces and troughs; rough sastrugi cover the windward faces and crests. The megadune pattern is crossed by smooth to eroded wind-parallel longitudinal dunes. Wind-eroded longitudinal dunes form spectacular 1-meter-high sastrugi in nearby areas. This data set contains ground penetrating radar (GPR) data showing surface morphology and internal layering structure along with global positioning system (GPS) data collected within an area of 60 km<sup>2</sup>. GPS data are provided in space-delimited ASCII text Microsoft Excel formats, while GPR data are in JPEG format. Data are available via FTP.	["POLYGON((124.0218 -80.5304,124.22264 -80.5304,124.42348 -80.5304,124.62432 -80.5304,124.82516 -80.5304,125.026 -80.5304,125.22684 -80.5304,125.42768 -80.5304,125.62852 -80.5304,125.82936 -80.5304,126.0302 -80.5304,126.0302 -80.55538,126.0302 -80.58036,126.0302 -80.60534,126.0302 -80.63032,126.0302 -80.6553,126.0302 -80.68028,126.0302 -80.70526,126.0302 -80.73024,126.0302 -80.75522,126.0302 -80.7802,125.82936 -80.7802,125.62852 -80.7802,125.42768 -80.7802,125.22684 -80.7802,125.026 -80.7802,124.82516 -80.7802,124.62432 -80.7802,124.42348 -80.7802,124.22264 -80.7802,124.0218 -80.7802,124.0218 -80.75522,124.0218 -80.73024,124.0218 -80.70526,124.0218 -80.68028,124.0218 -80.6553,124.0218 -80.63032,124.0218 -80.60534,124.0218 -80.58036,124.0218 -80.55538,124.0218 -80.5304))"]
Ross Ice Drainage System (RIDS) Glaciochemical Analysis	9316564	2005-05-09	Mayewski, Paul A.; Kreutz, Karl; Twickler, Mark; Whitlow, Sallie; Meeker, Loren D.	Ross Ice Drainage System (RIDS) Late Holocene Climate Variability	The Ross Ice Drainage System (RIDS) project provides a high-resolution record of atmospheric chemical deposition taken from several ice cores and snow pits located at sites within or immediately adjacent to the Ross Ice Drainage System. Three sites were visited during a 1995 traverse in inland West Antarctica. The traverse was 158 km, trending 26° from Byrd Surface Camp. The core from site A (78°44'S, 116°20'W) is 148 m deep, the core from site B (79°27.66'S, 118°02.68'W) is 60 m deep, and the core from site C (80°00.85'S, 119°33.73'W) is 60 m deep. Glaciochemical analysis focuses on the major ions deposited from the antarctic atmosphere, including Na (sodium), NH4 (ammonium), K (potassium), Mg (magnesium), Ca (calcium), Cl (chloride), NO3 (nitrate), and SO4 (sulfate). Chemical analysis also includes methanesulfonic acid (MSA) and nssSO4 (non-sea salt sulfate). The data are available by FTP in ASCII text format and Excel files.	["POINT(-119.562 -80.014)", "POINT(-116.333 -78.733)", "POINT(-118.045 -79.461)"]
Newall Glacier Ice Core and Snow Pit Beta Profiles, Chemistry, and Stratigraphy	8613786 8411018	2004-08-26	Welch, Kathy A.; Mayewski, Paul A.	Characterization of Climatic Events for the Last 2 x 103y through the Retrieval of Ice Cores from the Transantarctic Mountains, Antarctica	This data set includes beta profiles, chemistry, stratigraphy data, and density and temperature profiles collected from snow pits and two ice cores on the Newall Glacier. Snow pit and ice core data were collected between 1987 and 1989. Ice Core A was 175 meters long and core B was 150 meters long.	[]
South Pole Snow Pit, 1988 and 1989	None	2004-06-24	Mayewski, Paul A.; Whitlow, Sallie	No project link provided	Information from 6-meter snow pits dug close to the South Pole in austral summer 1988-1989 by the Glacier Research Group of the University of New Hampshire (location - 38 km on grid 90 from South Pole station - eastern margin of clean air sector) are available. Major ion chemistry (Na, K, Mg, Ca, Cl, NO3, SO4), oxygen isotopes (I8O), H2O2, and beta from a 6-meter snow pit covering the period 1955 to 1989 are included. Major ion chemistry for a series of surface snow samples were also collected on the traverse to the pit.	["POINT(-180 -90)"]
Central West Antarctic Glaciochemistry from Ice Cores	None	2003-10-16	Reusch, David	No project link provided	Glaciochemical and accumulation rate records developed from four ice cores in central West Antarctica are used to reconstruct former atmospheric circulation patterns in this region for the last 40 years with extended records (150-250 years) at two sites. The sites lie on a 200 km traverse from 82 degrees 22 minutes south, 119 degrees 17 minutes west to 81 degrees 22 minutes south, 107 degrees 17 minutes west, gaining elevation from 950 to 1930 m. The glaciochemical records represent the major ionic species present in Antarctic snow: sodium, potassium, magnesium, calcium, chloride, nitrate, and sulfate.	["POLYGON((-120 -80,-118.5 -80,-117 -80,-115.5 -80,-114 -80,-112.5 -80,-111 -80,-109.5 -80,-108 -80,-106.5 -80,-105 -80,-105 -80.5,-105 -81,-105 -81.5,-105 -82,-105 -82.5,-105 -83,-105 -83.5,-105 -84,-105 -84.5,-105 -85,-106.5 -85,-108 -85,-109.5 -85,-111 -85,-112.5 -85,-114 -85,-115.5 -85,-117 -85,-118.5 -85,-120 -85,-120 -84.5,-120 -84,-120 -83.5,-120 -83,-120 -82.5,-120 -82,-120 -81.5,-120 -81,-120 -80.5,-120 -80))"]
Snow-atmosphere Transfer Function for Reversibly Deposited Chemical Species in West Antarctica	9526572	2002-07-11	McConnell, Joseph; Bales, Roger	Snow-Atmosphere Transfer Function for Reversibly Deposited Chemical Species in West Antarctica	This data set is part of the West Antarctic Ice Sheet Cores (WAISCORES) project, an NSF-funded project to understand the influence of the West Antarctic Ice Sheet on climate and sea level change. WAISCORES researchers acquired and analyzed snow pit and core samples from the Siple Dome, in the Siple Coast region, West Antarctica. This data set includes glaciochemical spatial variability data for six Siple Dome snow pits. Samples involved measuring hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) and formaldehyde (HCHO) in the air, snow, firn, and ice via suppressed ion chromatography. The data can be used to interpret changes in concentrations of these species recorded in ice cores. Data in this collection were obtained during two Antarctic field seasons in 1994 to 1995 and 1996 to 1997. Data are available via FTP in tab-delimited ASCII text (.dat, .txt) file format.	["POINT(-149 -81)"]
WAISCORES Snow Pit Chemistry, Antarctica	9526449	2002-07-11	Kreutz, Karl; Mayewski, Paul A.	Siple Dome Deep Ice Core Glaciochemistry and Regional Survey - A Contribution to the WAIS Initiative	This data set is part of the West Antarctic Ice Sheet cores (WAISCORES) project, an NSF-funded project to understand the influence of the West Antarctic Ice Sheet on climate and sea level change. WAISCORES researchers acquired and analyzed snow pit and core samples from the Siple Dome, in the Siple Coast region, West Antarctica. This data set includes glaciochemical spatial variability data for Siple Dome snow pits B, E, F, G, H, and 1 through 6. Samples were analyzed for soluble ion content via suppressed ion chromatography. Each pit was sampled at 2 cm resolution for ion chemistry using clean procedures, and sampled again at 3 cm resolution for density calculations. Snow pit names and locations correspond to the 1996 to 1997 season shallow core sites. Data in this collection were obtained during two Antarctic field seasons in 1994 to 1995 and 1996 to 1997. Data are available via FTP in space-delimited ASCII text (.dat) file format.	["POLYGON((-149.11 -81.05,-149.05 -81.05,-148.99 -81.05,-148.93 -81.05,-148.87 -81.05,-148.81 -81.05,-148.75 -81.05,-148.69 -81.05,-148.63 -81.05,-148.57 -81.05,-148.51 -81.05,-148.51 -81.11,-148.51 -81.17,-148.51 -81.23,-148.51 -81.29,-148.51 -81.35,-148.51 -81.41,-148.51 -81.47,-148.51 -81.53,-148.51 -81.59,-148.51 -81.65,-148.57 -81.65,-148.63 -81.65,-148.69 -81.65,-148.75 -81.65,-148.81 -81.65,-148.87 -81.65,-148.93 -81.65,-148.99 -81.65,-149.05 -81.65,-149.11 -81.65,-149.11 -81.59,-149.11 -81.53,-149.11 -81.47,-149.11 -81.41,-149.11 -81.35,-149.11 -81.29,-149.11 -81.23,-149.11 -81.17,-149.11 -81.11,-149.11 -81.05))"]
Snow and Firn Temperature and Permeability Measurements from Siple Dome, Antarctica	9526601	2001-12-01	Albert, Mary R.	Near-Surface Processes Affecting Gas Exchange: West Antarctic Ice Sheet	This data set includes measurements of snow and firn temperature and permeability collected between November 1998 and June 1999 at Siple Dome. The physical characteristics of snow determine the nature of air-snow exchange processes, which in turn affect chemical records in ice cores. Thus a better understanding of the physical properties of snow will improve interpretation of ice core records of atmospheric composition. Data are available via ftp in both ASCII and Excel formats.	["POINT(-148 -81)"]
Firn Air Isotope and Temperature Measurements from Siple Dome and South Pole	9725305 9725918	2001-01-01	Severinghaus, Jeffrey P.; Battle, Mark; Grachev, Alexi	Thermal Fractionation of Firn Air and the Ice Core Record of Abrupt Interstadial Climate Change	This data set includes d15N, d18O/2, dO2/N2/4, d40Ar/4, d38/Ar/2, d84Kr/48, and d132Xe/96 values for air drawn from the top 15 to 50 m of firn at the South Pole (summer and winter 1998) and a site at Siple Dome (summers 1996 and 1998). Data also include related firn temperature measurements. The objective of this research was to better understand thermal fractionation processes affecting records of atmospheric history from firn and ice core gases. Recent work (e.g., Severinghaus and Brook, 1999) has exploited trapped air in ice and deep firn as a record of past atmospheric composition and climate change. Interpretation of these paleoclimate archives is complicated by artifacts of thermal diffusion, a process in which heavier gases migrate down temperature gradients toward colder regions in the firn. Seasonal temperature change at the snow surface creates strong temperature gradients in the top few meters of the firn, which cause isotopic fractionation of firn gases. A specific goal of this research is to identify any long-term effects of seasonal temperature fluctuations on firn air isotopic anomalies.	["POINT(-148.767 -81.667)", "POINT(-102 -89.997)"]
Dronning Maud Land, Antarctica, Ice Core, 1991 and 1992	None	1999-01-01	Whitlow, Sallie; Mayewski, Paul A.	No project link provided	Major ion concentration values (Na, Mg, Ca, Cl, NO3, SO4, MSA) were analyzed from a 20-meter ice core drilled in Dronning Maud Land, Antarctica (location - 65 01' East, 75 00' South, elevation - 2,900 m a.s.l.). The core was drilled during the austral summer 1991-1992. Major ion analysis was by ion chromatography. The anions were analyzed on a Dionex AS4A column; the cations on a Dionex CS12 column and MSA on a Dionex AS4 column. All used suppressed chromatography. Using established protocols to prevent contamination, the core was processed into 3-centimeter pieces by the Glacier Research Group at the University of New Hampshire's Climate Change Research Center. The 3-cm pieces were kept frozen until major ion analysis.	["POINT(65 -75)"]
Newall Glacier Snow Pit and Ice Core, 1987 to 1989	None	1999-01-01	Mayewski, Paul A.; Whitlow, Sallie	No project link provided	Snow pit and ice core data from the Newall Glacier (location - 162 30' East, 77 35' South) were collected during 1987 and 1988. These include information on chemistry, Beta profiles and stratigraphy. Ice cores were collected during the austral summer of 1988-1989 and contain information on chemistry, Pb- 210 profiles, density profiles and temperature profiles. Core A was 175 meters long and core B was 150 meters long. The snow pits were dug and sampled by the Glacier Research Group (GRG), using established protocols to prevent contamination. The samples for major ion chemistry remained frozen until melted for analysis in the GRG lab, located at the University of New Hampshire (UNH), and all core processing was done by GRG established protocols to prevent contamination. Major ions were analyzed using suppressed ion chromatography.	["POINT(162 -77)"]
Dominion Range Snow Pit and Ice Core, 1984 and 1985	None	1999-01-01	Mayewski, Paul A.; Whitlow, Sallie	No project link provided	Information from snow pits and an ice core were collected at Dominion Range (location - 166 10' East, 85 15' South, elevation - 2,700m) in 1984-1985. The 6 meter snow pit was dug and sampled in 1984-1985 with a 3 cm sampling interval. Four 1 meter snow pits were dug and sampled in 1984-1985 with a 3 cm sampling interval. One core was drilled during the austral summer 1984-1985 with a depth of 160 meters. Chemistry and density data were collected from the 1 meter pits. Chemistry, beta profile and density data were collected from the 6 meter snow pits. Chemistry (Na NH4, K, Mg, Ca, Cl, NO3, SO4, MSA), particles and a lead-210 profile were collected from the ice core.	["POINT(166 -85)"]

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