USAP-DC

{"dp_type": "Dataset", "free_text": "Transantarctic Mountains"}

[{"awards": "2042495 Blackburn, Terrence", "bounds_geometry": ["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))"], "date_created": "Wed, 05 Mar 2025 00:00:00 GMT", "description": "This dataset contains U-series, d18O, d13C and 87Sr/86Sr data from 25 subglacial calcite precipitates from locations around the Antarctic ice sheet, primarily outlet glaciers near the ice sheet margins and nunataks in the Transantarctic mountains. Lat-lon data for each sample is given as well.", "east": 180.0, "geometry": ["POINT(0 -89.999)"], "keywords": "Antarctica; Cryosphere", "locations": "Antarctica", "north": -60.0, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Gagliardi, Jessica", "project_titles": "Collaborative Research: Reconstructing East Antarctica\u2019s Past Response to Climate using Subglacial Precipitates", "projects": [{"proj_uid": "p0010192", "repository": "USAP-DC", "title": "Collaborative Research: Reconstructing East Antarctica\u2019s Past Response to Climate using Subglacial Precipitates"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Subglacial precipitates record Antarctic ice sheet response to Southern Ocean warming ", "uid": "601911", "west": -180.0}, {"awards": "1914698 Hansen, Samantha", "bounds_geometry": ["POLYGON((90 -65,99 -65,108 -65,117 -65,126 -65,135 -65,144 -65,153 -65,162 -65,171 -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 -90,171 -90,162 -90,153 -90,144 -90,135 -90,126 -90,117 -90,108 -90,99 -90,90 -90,90 -87.5,90 -85,90 -82.5,90 -80,90 -77.5,90 -75,90 -72.5,90 -70,90 -67.5,90 -65))"], "date_created": "Wed, 24 Jan 2024 00:00:00 GMT", "description": "Recent investigations in polar environments have examined solid-Earth-ice-sheet feedbacks and have emphasized that glacial isostatic adjustment, tectonic, and geothermal forcings exert first-order control on the physical conditions at and below the ice-bed interface and must be taken into account when evaluating ice-sheet evolution. However, the solid-Earth structure beneath much of Antarctica is still poorly constrained given the sparse distribution of seismic stations across the continent and the generally low seismicity rate. One region of particular interest is the Wilkes Subglacial Basin (WSB) in East Antarctica. During the mid-Pliocene warm period, the WSB may have contributed 3-4 m to the estimated 20 m rise in sea-level, indicating that this region could also play an important role in future warming scenarios. However, the WSB may have experienced notable bedrock uplift since the Pliocene; therefore, past geologic inferences of instability may not serve as a simple analogue for the future.\r\n\r\nUsing records of ambient seismic noise recorded by both temporary and long-term seismic networks, along with a full-waveform tomographic inversion technique, we have developed improved images of the lithospheric structure beneath East Antarctica, including the WSB. Empirical Green\u2019s Functions with periods between 40 and 340 s have been extracted using a frequency-time normalization technique, and a finite-difference approach with a spherical grid has been employed to numerically model synthetic seismograms. Associated sensitivity kernels have also been constructed using a scattering integral method. Our results suggest the WSB is underlain by slow seismic velocities, with faster seismic structure beneath the adjacent Transantarctic Mountains and the Belgica Subglacial Highlands. This may indicate that the WSB is associated with a region of thinner lithosphere, possibly associated with prior continental rifting. The seismic heterogeneity highlighted in our model could have significant implications for understanding the geodynamic origin of WSB topography and its influence on ice-sheet behavior.\r\n\r\nThe model file and associated plotting scripts are provided.", "east": 180.0, "geometry": ["POINT(135 -77.5)"], "keywords": "Ambient Noise; Antarctica; East Antarctica; Geoscientificinformation; Seismic Tomography; Seismology", "locations": "Antarctica; East Antarctica", "north": -65.0, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Hansen, Samantha; Emry, Erica", "project_titles": "Collaborative Research: Resolving earth structure influence on ice-sheet stability in the Wilkes\r\nSubglacial Basin (RESISSt)", "projects": [{"proj_uid": "p0010204", "repository": "USAP-DC", "title": "Collaborative Research: Resolving earth structure influence on ice-sheet stability in the Wilkes\r\nSubglacial Basin (RESISSt)"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Full Waveform Ambient Noise Tomography for East Antarctica", "uid": "601763", "west": 90.0}, {"awards": "1445205 Putkonen, Jaakko", "bounds_geometry": ["POLYGON((157.45 -83.14,157.45299999999997 -83.14,157.456 -83.14,157.459 -83.14,157.462 -83.14,157.46499999999997 -83.14,157.468 -83.14,157.471 -83.14,157.474 -83.14,157.47699999999998 -83.14,157.48 -83.14,157.48 -83.141,157.48 -83.142,157.48 -83.143,157.48 -83.144,157.48 -83.14500000000001,157.48 -83.146,157.48 -83.147,157.48 -83.14800000000001,157.48 -83.149,157.48 -83.15,157.47699999999998 -83.15,157.474 -83.15,157.471 -83.15,157.468 -83.15,157.46499999999997 -83.15,157.462 -83.15,157.459 -83.15,157.456 -83.15,157.45299999999997 -83.15,157.45 -83.15,157.45 -83.149,157.45 -83.14800000000001,157.45 -83.147,157.45 -83.146,157.45 -83.14500000000001,157.45 -83.144,157.45 -83.143,157.45 -83.142,157.45 -83.141,157.45 -83.14))"], "date_created": "Thu, 09 Feb 2023 00:00:00 GMT", "description": "These data include the measurements and analyses done on a ~10 meter long ice cores drilled in Ong Valley buried ice site. Further descriptions can be found in the related paper listed below.", "east": 157.48, "geometry": ["POINT(157.46499999999997 -83.14500000000001)"], "keywords": "Antarctica; Buried Ice; Cosmogenic Isotopes; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Ice Core Records; Old Ice; Ong Valley", "locations": "Antarctica; Ong Valley", "north": -83.14, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Putkonen, Jaakko; Bergelin, Marie", "project_titles": "Collaborative Research: Long Term Sublimation/Preservation of Two Separate, Buried Glacier Ice Masses, Ong Valley, Southern Transantarctic Mountains", "projects": [{"proj_uid": "p0010231", "repository": "USAP-DC", "title": "Collaborative Research: Long Term Sublimation/Preservation of Two Separate, Buried Glacier Ice Masses, Ong Valley, Southern Transantarctic Mountains"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -83.15, "title": "Old Ice, Ong Valley, Transantarctic Mountains", "uid": "601665", "west": 157.45}, {"awards": "0733025 Blankenship, Donald", "bounds_geometry": ["POLYGON((153 -79,153.9 -79,154.8 -79,155.7 -79,156.6 -79,157.5 -79,158.4 -79,159.3 -79,160.2 -79,161.1 -79,162 -79,162 -79.14,162 -79.28,162 -79.42,162 -79.56,162 -79.7,162 -79.84,162 -79.98,162 -80.12,162 -80.26,162 -80.4,161.1 -80.4,160.2 -80.4,159.3 -80.4,158.4 -80.4,157.5 -80.4,156.6 -80.4,155.7 -80.4,154.8 -80.4,153.9 -80.4,153 -80.4,153 -80.26,153 -80.12,153 -79.98,153 -79.84,153 -79.7,153 -79.56,153 -79.42,153 -79.28,153 -79.14,153 -79))"], "date_created": "Fri, 02 Sep 2022 00:00:00 GMT", "description": "HiCARS data collected over Darwin and Hatherton Glaciers during ICECAP Test Flight ICP1/F05", "east": 162.0, "geometry": ["POINT(157.5 -79.7)"], "keywords": "Airborne Radar; Antarctica; Basler; Darwin Glacier; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Hatherton Glacier; Hicars; ICECAP; Ice Penetrating Radar; Ice Thickness; Transantarctic Mountains", "locations": "Darwin Glacier; Transantarctic Mountains; Hatherton Glacier; Antarctica", "north": -79.0, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Gillespie, Mette; Blankenship, Donald D.; Young, Duncan A.; Siegert, Martin; Holt, John W.; Greenbaum, Jamin; Schroeder, Dustin", "project_titles": "IPY Research: Investigating the Cryospheric Evolution of the Central Antarctic Plate (ICECAP)", "projects": [{"proj_uid": "p0000719", "repository": "USAP-DC", "title": "IPY Research: Investigating the Cryospheric Evolution of the Central Antarctic Plate (ICECAP)"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -80.4, "title": "ICECAP ice thickness data over the Darwin and Hatherton Glaciers, Transantarctic Mountains, Antarctica", "uid": "601605", "west": 153.0}, {"awards": "9319379 Blankenship, Donald", "bounds_geometry": ["POLYGON((150 -81.9,152.1 -81.9,154.2 -81.9,156.3 -81.9,158.4 -81.9,160.5 -81.9,162.6 -81.9,164.7 -81.9,166.8 -81.9,168.9 -81.9,171 -81.9,171 -82.06,171 -82.22,171 -82.38000000000001,171 -82.54,171 -82.7,171 -82.86,171 -83.02,171 -83.18,171 -83.34,171 -83.5,168.9 -83.5,166.8 -83.5,164.7 -83.5,162.6 -83.5,160.5 -83.5,158.4 -83.5,156.3 -83.5,154.2 -83.5,152.1 -83.5,150 -83.5,150 -83.34,150 -83.18,150 -83.02,150 -82.86,150 -82.7,150 -82.54,150 -82.38000000000001,150 -82.22,150 -82.06,150 -81.9))"], "date_created": "Thu, 01 Sep 2022 00:00:00 GMT", "description": "The RGB survey is a single line flown up Robb Glacier. Laser altimetry, ice-penetrating radar, gravity and magnetic field intensity data were collected. This work was funded by NSF-OPP 9319379 with the project title: Collaborative Research: Contrasting Architecture and Dynamics of the Transantarctic Mountains (Pensacola-Pole Transect). Principal Investigators were D.D. Blankenship, University of Texas Institute for Geophysics, and R.E. Bell and W.R. Buck, Lamont-Doherty Earth Observatory.", "east": 171.0, "geometry": ["POINT(160.5 -82.7)"], "keywords": "Airborne Radar; Antarctica; Bed Elevation; Geophysics; Glaciers/ice Sheet; Glaciers/Ice Sheet; Ice Surface Elevation; Ice Thickness; Robb Glacier; Transantarctic Mountains", "locations": "Antarctica; Robb Glacier; Transantarctic Mountains", "north": -81.9, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Blankenship, Donald D.; Bell, Robin; Buck, W. Roger; Young, Duncan A.", "project_titles": "Continuation of Activities for the Support Office for Aerogeophysical Research (SOAR)", "projects": [{"proj_uid": "p0000125", "repository": "USAP-DC", "title": "Continuation of Activities for the Support Office for Aerogeophysical Research (SOAR)"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -83.5, "title": "RBG - Robb Glacier Survey", "uid": "601604", "west": 150.0}, {"awards": "9319379 Blankenship, Donald", "bounds_geometry": ["POLYGON((-180 -75,-172 -75,-164 -75,-156 -75,-148 -75,-140 -75,-132 -75,-124 -75,-116 -75,-108 -75,-100 -75,-100 -76.5,-100 -78,-100 -79.5,-100 -81,-100 -82.5,-100 -84,-100 -85.5,-100 -87,-100 -88.5,-100 -90,-108 -90,-116 -90,-124 -90,-132 -90,-140 -90,-148 -90,-156 -90,-164 -90,-172 -90,180 -90,172 -90,164 -90,156 -90,148 -90,140 -90,132 -90,124 -90,116 -90,108 -90,100 -90,100 -88.5,100 -87,100 -85.5,100 -84,100 -82.5,100 -81,100 -79.5,100 -78,100 -76.5,100 -75,108 -75,116 -75,124 -75,132 -75,140 -75,148 -75,156 -75,164 -75,172 -75,-180 -75))"], "date_created": "Sun, 24 Jul 2022 00:00:00 GMT", "description": "These data represent the 1-km decimated version of the SOAR ice thickness data provided to the Bedmap2 project, collected as part of various projects between 1991 and 2001. It encompasses the Corridor Aerogeophysics of the South East Ross Zone (CASERTZ) surveys of the Byrd Subglacial Basin (BSB), Bindschadler Ice Stream (WAZ/TKD), and the upstream catchments of Kamb Ice Steam and Willians Ice Stream (IRE); targeted West Antarctic glaciology projects (IPB/WAZ/DVD/STI/LIV); corridors across the Transantarctic Mountains to South Pole (PPT) and Dome C (WLK); and a version of the Lake Vostok dataset (LVS). Data were collected as stacked log detected traces by the SOAR TUD IV system with an attached digitizer. The digitizer was significantly updated in 1997 (RTZ6). Data interpretation approaches can be found in Blankenship et al., 2001.\r\n\r\nData is in ASCII format. Transects are separated by GMT style segment headers with the transect name.\r\nColumns are:\r\n1. Year\r\n2. Day of Year\r\n3. Seconds of Day\r\n4. Longitude (degrees, WGS-84)\r\n5. Latitude (degrees, WGS-84)\r\n6. Easting (meters, EPSG 3031; Polar Stereographic with true scale at 71\u02daS)\r\n7. Northing (meters, EPSG 3031; Polar Stereographic with true scale at 71\u02daS)\r\n8. Surface Elevation (meters, WGS-84) - derived where possible from laser data\r\n9. Ice thickness (meters, using a speed of light in air of 299705000 m/s and a refractive index of 1.78; no firn correction)\r\n10. Bed Elevation (meters, WGS-84) - column 8 minus column 9\r\n11. The transect name formatted by Project/Set/Transect\r\n", "east": 100.0, "geometry": ["POINT(-180 -82.5)"], "keywords": "Antarctica; Ice Penetrating Radar; Ice Thickness; SOAR", "locations": "Antarctica; Antarctica", "north": -75.0, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Blankenship, Donald D.; Young, Duncan A.; Kempf, Scott D.", "project_titles": null, "projects": null, "repositories": null, "science_programs": null, "south": -90.0, "title": "Support Office for Airborne Research 1 km sampled ice thickness data", "uid": "601588", "west": -100.0}, {"awards": "1543367 Shubin, Neil", "bounds_geometry": ["POLYGON((158.3 -78.43,158.359 -78.43,158.418 -78.43,158.477 -78.43,158.536 -78.43,158.595 -78.43,158.654 -78.43,158.713 -78.43,158.772 -78.43,158.831 -78.43,158.89 -78.43,158.89 -78.44200000000001,158.89 -78.45400000000001,158.89 -78.46600000000001,158.89 -78.47800000000001,158.89 -78.49000000000001,158.89 -78.502,158.89 -78.514,158.89 -78.526,158.89 -78.538,158.89 -78.55,158.831 -78.55,158.772 -78.55,158.713 -78.55,158.654 -78.55,158.595 -78.55,158.536 -78.55,158.477 -78.55,158.418 -78.55,158.359 -78.55,158.3 -78.55,158.3 -78.538,158.3 -78.526,158.3 -78.514,158.3 -78.502,158.3 -78.49000000000001,158.3 -78.47800000000001,158.3 -78.46600000000001,158.3 -78.45400000000001,158.3 -78.44200000000001,158.3 -78.43))"], "date_created": "Fri, 24 Jun 2022 00:00:00 GMT", "description": "List of locations and identified fossils from the Aztec Siltstone (Mid-Late Devonian) in the Transantarctic Mountains (2018-2019 field season).", "east": 158.89, "geometry": ["POINT(158.595 -78.49000000000001)"], "keywords": "Acanthodii; Antarctica; Chondrichthyes; Early Vertebrates; Osteolepiformes; Paleontology; Placodermi; Transantarctic Mountains; Vertebrate Evolution", "locations": "Antarctica; Transantarctic Mountains", "north": -78.43, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Daeschler, Ted", "project_titles": "Middle-Late Devonian Vertebrates of Antarctica", "projects": [{"proj_uid": "p0010340", "repository": "USAP-DC", "title": "Middle-Late Devonian Vertebrates of Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.55, "title": "Vertebrate Fossils from the Aztec Siltstone (Mid-Late Devonian) 2 (2018-2019)", "uid": "601584", "west": 158.3}, {"awards": "1543367 Shubin, Neil", "bounds_geometry": ["POLYGON((160.24 -77.53,160.286 -77.53,160.332 -77.53,160.37800000000001 -77.53,160.424 -77.53,160.47 -77.53,160.516 -77.53,160.56199999999998 -77.53,160.608 -77.53,160.654 -77.53,160.7 -77.53,160.7 -77.557,160.7 -77.584,160.7 -77.611,160.7 -77.638,160.7 -77.66499999999999,160.7 -77.692,160.7 -77.719,160.7 -77.746,160.7 -77.773,160.7 -77.8,160.654 -77.8,160.608 -77.8,160.56199999999998 -77.8,160.516 -77.8,160.47 -77.8,160.424 -77.8,160.37800000000001 -77.8,160.332 -77.8,160.286 -77.8,160.24 -77.8,160.24 -77.773,160.24 -77.746,160.24 -77.719,160.24 -77.692,160.24 -77.66499999999999,160.24 -77.638,160.24 -77.611,160.24 -77.584,160.24 -77.557,160.24 -77.53))"], "date_created": "Fri, 17 Jun 2022 00:00:00 GMT", "description": "List of locations and identified fossils from the Aztec Siltstone (Mid-Late Devonian) in the Transantarcitc Mountains", "east": 160.7, "geometry": ["POINT(160.47 -77.66499999999999)"], "keywords": "Acanthodii; Antarctica; Chondrichthyes; Early Vertebrates; Osteolepiformes; Paleontology; Placodermi; Transantarctic Mountains; Vertebrate Evolution", "locations": "Antarctica; Transantarctic Mountains", "north": -77.53, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Daeschler, Ted", "project_titles": "Middle-Late Devonian Vertebrates of Antarctica", "projects": [{"proj_uid": "p0010340", "repository": "USAP-DC", "title": "Middle-Late Devonian Vertebrates of Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.8, "title": "Vertebrate Fossils from the Aztec Siltstone (Mid-Late Devonian)", "uid": "601580", "west": 160.24}, {"awards": "1443556 Thomson, Stuart", "bounds_geometry": ["POLYGON((-180 -83.5,-178 -83.5,-176 -83.5,-174 -83.5,-172 -83.5,-170 -83.5,-168 -83.5,-166 -83.5,-164 -83.5,-162 -83.5,-160 -83.5,-160 -83.75,-160 -84,-160 -84.25,-160 -84.5,-160 -84.75,-160 -85,-160 -85.25,-160 -85.5,-160 -85.75,-160 -86,-162 -86,-164 -86,-166 -86,-168 -86,-170 -86,-172 -86,-174 -86,-176 -86,-178 -86,180 -86,179 -86,178 -86,177 -86,176 -86,175 -86,174 -86,173 -86,172 -86,171 -86,170 -86,170 -85.75,170 -85.5,170 -85.25,170 -85,170 -84.75,170 -84.5,170 -84.25,170 -84,170 -83.75,170 -83.5,171 -83.5,172 -83.5,173 -83.5,174 -83.5,175 -83.5,176 -83.5,177 -83.5,178 -83.5,179 -83.5,-180 -83.5))"], "date_created": "Tue, 13 Jul 2021 00:00:00 GMT", "description": "List of supplementary tables from publication\r\nHe, J., Thomson, S.N., Reiners, P.W., Hemming, S.R., and Licht, K.J., 2021, Rapid erosion of the central Transantarctic Mountains at the Eocene-Oligocene transition: Evidence from skewed (U-Th)/He date distributions near Beardmore Glacier: Earth and Planetary Science Letters, v. 567, p. 117009, doi:10.1016/j.epsl.2021.117009.\r\n\r\nSupp. Table 1 U-Th/He data\r\nSupp. Table 2 Trace and REE data\r\nSupp. Table 3 Compilation with elevation-weighted resampling\r\nSupp. Table 4 Summary statistics and sampling distribution of large-n samples and compilations.\r\nSupp. Table 5 Perpendicular distance of BAR and CMK sample to Kukri Peneplain\r\nSupp. Table 6 Compilation of apatite He data from east Antarctica used in Fig. 1\r\n", "east": -160.0, "geometry": ["POINT(-175 -84.75)"], "keywords": "Antarctica; Beardmore Glacier; Erosion; Landscape Evolution; Shackleton Glacier; Transantarctic Mountains; (U-Th)/He", "locations": "Antarctica; Transantarctic Mountains; Beardmore Glacier; Shackleton Glacier", "north": -83.5, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Thomson, Stuart; He, John; Reiners, Peter; Hemming, Sidney R.; Licht, Kathy", "project_titles": "Collaborative Research: East Antarctic Glacial Landscape Evolution (EAGLE): A Study using Combined Thermochronology, Geochronology and Provenance Analysis", "projects": [{"proj_uid": "p0010188", "repository": "USAP-DC", "title": "Collaborative Research: East Antarctic Glacial Landscape Evolution (EAGLE): A Study using Combined Thermochronology, Geochronology and Provenance Analysis"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -86.0, "title": "Apatite (U-Th)/He and TREE Data Central Transantarctic Mountains", "uid": "601462", "west": 170.0}, {"awards": "0440670 Hulbe, Christina", "bounds_geometry": ["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 -86,177.5 -86,175 -86,172.5 -86,170 -86,167.5 -86,165 -86,162.5 -86,160 -86,157.5 -86,155 -86,155 -85.1,155 -84.2,155 -83.3,155 -82.4,155 -81.5,155 -80.6,155 -79.7,155 -78.8,155 -77.9,155 -77,157.5 -77,160 -77,162.5 -77,165 -77,167.5 -77,170 -77,172.5 -77,175 -77,177.5 -77,-180 -77))"], "date_created": "Fri, 19 Feb 2021 00:00:00 GMT", "description": "The surface of the Ross Ice Shelf (RIS) is textured by flow stripes, crevasses and other fea- tures related to ice flow and deformation. Here, moderate resolution optical satellite images are used to map and classify regions of the RIS characterized by different surface textures. Because the textures arise from ice deformation, the map is used to identify structural provinces with common deformation history. We classify four province types: regions associated with large outlet glaciers, shear zones, exten- sion downstream of obstacles and suture zones between provinces with different upstream sources. Adjacent provinces with contrasting histories are in some locations deforming at different rates, suggest- ing that our province map is also an ice fabric map. Structural provinces have more complicated shapes in the part of the ice shelf fed by West Antarctic ice streams than in the part fed by outlet glaciers from the Transantarctic Mountains. The map may be used to infer past variations in stress conditions and flow events that cannot be inferred from flow traces alone.", "east": 155.0, "geometry": ["POINT(-177.5 -81.5)"], "keywords": "Antarctica", "locations": "Antarctica", "north": -77.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Hulbe, Christina; Ledoux, Christine; Forbes, Martin", "project_titles": "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", "projects": [{"proj_uid": "p0000096", "repository": "USAP-DC", "title": "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"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -86.0, "title": "MOA-derived Structural Feature Map of the Ross Ice Shelf", "uid": "601432", "west": -150.0}, {"awards": "1341631 Lyons, W. Berry; 1341736 Adams, Byron", "bounds_geometry": ["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))"], "date_created": "Sun, 03 Jan 2021 00:00:00 GMT", "description": "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. ", "east": -174.1338, "geometry": ["POINT(-175.77185 -84.977)"], "keywords": "Antarctica; Be-10; Beryllium-10; Cosmogenic Radionuclides; Geochemistry; Geomorphology; Shackleton Glacier; Surface Exposure Dates", "locations": "Antarctica; Shackleton Glacier", "north": -84.4661, "nsf_funding_programs": "Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems", "persons": "Diaz, Melisa A.", "project_titles": "Collaborative Research: The Role of Glacial History on the Structure and Functioning of Ecological Communities in the Shackleton Glacier Region of the Transantarctic Mountains", "projects": [{"proj_uid": "p0010140", "repository": "USAP-DC", "title": "Collaborative Research: The Role of Glacial History on the Structure and Functioning of Ecological Communities in the Shackleton Glacier Region of the Transantarctic Mountains"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -85.4879, "title": "Meteoric 10Be data of soils from the Shackleton Glacier region", "uid": "601421", "west": -177.4099}, {"awards": "1341736 Adams, Byron; 1341631 Lyons, W. Berry", "bounds_geometry": ["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))"], "date_created": "Sat, 02 Jan 2021 00:00:00 GMT", "description": "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. ). \u03b415N-NO3 values ranged from -47.8 to 20.4\u2030 and, while all \u039417O-NO3 values are positive, they ranged from 15.7 to 45.9\u2030. \u03b434S-SO4 and \u03b418O-SO4 values ranged from 12.5 and 17.9\u2030 and -14.5 to -7.1\u2030, respectively. Total inorganic carbon isotopes ((bi)carbonate) in bulk soil samples ranged from 0.2 to 8.5\u2030 for \u03b413C and -38.8 to -9.6\u2030 for \u03b418O.", "east": -174.1338, "geometry": ["POINT(-175.76225 -84.976275)"], "keywords": "Antarctica; Geochemistry; Nitrate; Shackleton Glacier; Stable Isotopes; Sulfate; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains; Shackleton Glacier", "north": -84.46466667, "nsf_funding_programs": "Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems", "persons": "Diaz, Melisa A.; Lyons, W. Berry; Gardner, Christopher B.", "project_titles": "Collaborative Research: The Role of Glacial History on the Structure and Functioning of Ecological Communities in the Shackleton Glacier Region of the Transantarctic Mountains", "projects": [{"proj_uid": "p0010140", "repository": "USAP-DC", "title": "Collaborative Research: The Role of Glacial History on the Structure and Functioning of Ecological Communities in the Shackleton Glacier Region of the Transantarctic Mountains"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -85.48788333, "title": "Shackleton Glacier region water-soluble salt isotopes", "uid": "601419", "west": -177.3907}, {"awards": "1341736 Adams, Byron; 1341631 Lyons, W. Berry", "bounds_geometry": ["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))"], "date_created": "Sat, 02 Jan 2021 00:00:00 GMT", "description": "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 \u00b5m 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.", "east": -174.0885, "geometry": ["POINT(-175.7549 -84.9778)"], "keywords": "Antarctica; Geochemistry; Shackleton Glacier", "locations": "Antarctica; Shackleton Glacier", "north": -84.4647, "nsf_funding_programs": "Antarctic Organisms and Ecosystems; Antarctic Organisms and Ecosystems", "persons": "Diaz, Melisa A.; Lyons, W. Berry; Gardner, Christopher B.", "project_titles": "Collaborative Research: The Role of Glacial History on the Structure and Functioning of Ecological Communities in the Shackleton Glacier Region of the Transantarctic Mountains", "projects": [{"proj_uid": "p0010140", "repository": "USAP-DC", "title": "Collaborative Research: The Role of Glacial History on the Structure and Functioning of Ecological Communities in the Shackleton Glacier Region of the Transantarctic Mountains"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -85.4909, "title": "Shackleton Glacier region soil water-soluble geochemical data", "uid": "601418", "west": -177.4213}, {"awards": "1443213 Kaplan, Michael", "bounds_geometry": null, "date_created": "Wed, 30 Sep 2020 00:00:00 GMT", "description": "Input and other information for 3He surface exposure data", "east": null, "geometry": null, "keywords": "Antarctica; Transantarctic Mountains", "locations": "Transantarctic Mountains; Antarctica", "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Kaplan, Michael; Winckler, Gisela; Schaefer, Joerg", "project_titles": "Collaborative Research: Multidisciplinary Analysis of Antarctic Blue Ice Moraine Formation and their Potential as Climate Archives over Multiple Glacial Cycles", "projects": [{"proj_uid": "p0010131", "repository": "USAP-DC", "title": "Collaborative Research: Multidisciplinary Analysis of Antarctic Blue Ice Moraine Formation and their Potential as Climate Archives over Multiple Glacial Cycles"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "3He input data", "uid": "601376", "west": null}, {"awards": "1443213 Kaplan, Michael", "bounds_geometry": ["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))"], "date_created": "Wed, 30 Sep 2020 00:00:00 GMT", "description": "Sample metadata or information for cosmogenic-nuclide exposure data from the Mt. Achernar area.", "east": -149.7, "geometry": ["POINT(-174.25 -85.75)"], "keywords": "Antarctica; Cosmogenic Dating; Transantarctic Mountains", "locations": "Transantarctic Mountains; Antarctica", "north": -84.1, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Kaplan, Michael; Schaefer, Joerg; Winckler, Gisela", "project_titles": "Collaborative Research: Multidisciplinary Analysis of Antarctic Blue Ice Moraine Formation and their Potential as Climate Archives over Multiple Glacial Cycles", "projects": [{"proj_uid": "p0010131", "repository": "USAP-DC", "title": "Collaborative Research: Multidisciplinary Analysis of Antarctic Blue Ice Moraine Formation and their Potential as Climate Archives over Multiple Glacial Cycles"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -87.4, "title": "10Be and 26Al cosmogenic nuclide surface exposure data", "uid": "601375", "west": 161.2}, {"awards": "1443576 Panter, Kurt", "bounds_geometry": ["POLYGON((-154.1 -86.9,-154.03 -86.9,-153.96 -86.9,-153.89 -86.9,-153.82 -86.9,-153.75 -86.9,-153.68 -86.9,-153.61 -86.9,-153.54 -86.9,-153.47 -86.9,-153.4 -86.9,-153.4 -86.92,-153.4 -86.94,-153.4 -86.96,-153.4 -86.98,-153.4 -87,-153.4 -87.02,-153.4 -87.04,-153.4 -87.06,-153.4 -87.08,-153.4 -87.1,-153.47 -87.1,-153.54 -87.1,-153.61 -87.1,-153.68 -87.1,-153.75 -87.1,-153.82 -87.1,-153.89 -87.1,-153.96 -87.1,-154.03 -87.1,-154.1 -87.1,-154.1 -87.08,-154.1 -87.06,-154.1 -87.04,-154.1 -87.02,-154.1 -87,-154.1 -86.98,-154.1 -86.96,-154.1 -86.94,-154.1 -86.92,-154.1 -86.9))"], "date_created": "Fri, 05 Jun 2020 00:00:00 GMT", "description": "Mt. Early and Sheridan Bluff (87\u00b0S) are the above ice expression of Earth\u2019s southernmost volcanic field that lies approximately 300 km from the South Pole. The dataset supplies the locations and lithological descriptions of the units that the samples were collected from for dating and petrological study. Fundamental compositional information on the mafic volcanic rock samples include whole rock MgO concentrations (wt.%), the forsterite content of olivine and the oxygen isotopic composition of olivine. The dataset also provides a record of what samples have been analyzed for major and trace elements by XRF and ICP-MS, mineral chemistry by EMPA, radiogenic isotopes of Sr, Nd and Pb on whole rock powders by ICP-MS and dating by 40Ar/39Ar method.", "east": -153.4, "geometry": ["POINT(-153.75 -87)"], "keywords": "Antarctica; Chemistry:rock; Chemistry:Rock; Geochronology; Glacial Volcanism; Magma Differentiation; Major Elements; Mantle Melting; Solid Earth; Trace Elements; Transantarctic Mountains", "locations": "Transantarctic Mountains; Antarctica", "north": -86.9, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Panter, Kurt", "project_titles": "Investigating Early Miocene Sub-ice Volcanoes in Antarctica for Improved Modeling and understanding of a Large Magmatic Province", "projects": [{"proj_uid": "p0010105", "repository": "USAP-DC", "title": "Investigating Early Miocene Sub-ice Volcanoes in Antarctica for Improved Modeling and understanding of a Large Magmatic Province"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -87.1, "title": "Volcanological and Petrological measurements on Mt. Early and Sheridan Bluff volcanoes, upper Scott Glacier, Antarctica ", "uid": "601331", "west": -154.1}, {"awards": "9615704 Bell, Robin", "bounds_geometry": ["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))"], "date_created": "Fri, 24 Apr 2020 00:00:00 GMT", "description": "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.", "east": 175.0, "geometry": ["POINT(145 -76)"], "keywords": "Aerogeophysics; Airborne Gravity; Airplane; Antarctica; Free Air Gravity; Glaciers/ice Sheet; Glaciers/Ice Sheet; Gravimeter; Gravity; Gravity Data; Potential Field; Solid Earth; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": -74.0, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Bell, Robin", "project_titles": "Contrasting Architecture and Dynamics of the Transantarctic Mountains", "projects": [{"proj_uid": "p0010095", "repository": "USAP-DC", "title": "Contrasting Architecture and Dynamics of the Transantarctic Mountains"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.0, "title": "SOAR-WLK Airborne gravity data", "uid": "601293", "west": 115.0}, {"awards": "9615704 Bell, Robin", "bounds_geometry": ["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))"], "date_created": "Fri, 24 Apr 2020 00:00:00 GMT", "description": "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.", "east": -140.0, "geometry": ["POINT(-162.5 -87)"], "keywords": "Aerogeophysics; Airborne Gravity; Airplane; Antarctica; Free Air Gravity; Glaciers/ice Sheet; Glaciers/Ice Sheet; Gravimeter; Gravity; Gravity Data; Potential Field; Solid Earth; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": -84.0, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Bell, Robin", "project_titles": "Contrasting Architecture and Dynamics of the Transantarctic Mountains", "projects": [{"proj_uid": "p0010095", "repository": "USAP-DC", "title": "Contrasting Architecture and Dynamics of the Transantarctic Mountains"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "SOAR-PPT Airborne gravity data", "uid": "601292", "west": 175.0}, {"awards": "1443346 Stone, John", "bounds_geometry": ["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))"], "date_created": "Thu, 21 Nov 2019 00:00:00 GMT", "description": "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 .\r\nData for each sample consists of two lines of input parameters, as follows:\t\t\t\t\t\t\t\t\t\r\n{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}\r\n{Sample_name, Nuclide (in this case Be-10), Target_mineral (quartz), Be-10_concentration (atom/g), Error_Be-10_concentration (atom/g), Normalization}\r\nFurther information about the V3 input format is given at:\r\nhttp://hess.ess.washington.edu/math/docs/v3/v3_input_explained.html", "east": -158.0, "geometry": ["POINT(-166 -85.15)"], "keywords": "Antarctica; Be-10; Beryllium-10; Cosmogenic; Cosmogenic Dating; Cosmogenic Radionuclides; Deglaciation; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Liv Glacier; Rocks; Ross Ice Sheet; Surface Exposure Dates; Transantarctic Mountains", "locations": "Liv Glacier; Transantarctic Mountains; Ross Ice Sheet; Antarctica", "north": -84.5, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Stone, John", "project_titles": "Collaborative Research: High-resolution Reconstruction of Holocene Deglaciation in the Southern Ross Embayment", "projects": [{"proj_uid": "p0010053", "repository": "USAP-DC", "title": "Collaborative Research: High-resolution Reconstruction of Holocene Deglaciation in the Southern Ross Embayment"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -85.8, "title": "Cosmogenic nuclide data from glacial deposits along the Liv Glacier coast", "uid": "601226", "west": -174.0}, {"awards": "1443248 Hall, Brenda", "bounds_geometry": ["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))"], "date_created": "Thu, 05 Sep 2019 00:00:00 GMT", "description": "", "east": -150.0, "geometry": ["POINT(-160 -84.8)"], "keywords": "Antarctica; Carbon; Glaciology; Holocene; Radiocarbon; Ross Embayment; Ross Sea; Transantarctic Mountains", "locations": "Transantarctic Mountains; Ross Embayment; Ross Sea; Antarctica", "north": -84.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Hall, Brenda", "project_titles": "Collaborative Research: High-resolution Reconstruction of Holocene Deglaciation in the Southern Ross Embayment", "projects": [{"proj_uid": "p0010053", "repository": "USAP-DC", "title": "Collaborative Research: High-resolution Reconstruction of Holocene Deglaciation in the Southern Ross Embayment"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -85.6, "title": "Liv and Amundsen Glacier Radiocarbon Data", "uid": "601208", "west": -170.0}, {"awards": "1148982 Hansen, Samantha", "bounds_geometry": ["POLYGON((150 -72,152 -72,154 -72,156 -72,158 -72,160 -72,162 -72,164 -72,166 -72,168 -72,170 -72,170 -72.3,170 -72.6,170 -72.9,170 -73.2,170 -73.5,170 -73.8,170 -74.1,170 -74.4,170 -74.7,170 -75,168 -75,166 -75,164 -75,162 -75,160 -75,158 -75,156 -75,154 -75,152 -75,150 -75,150 -74.7,150 -74.4,150 -74.1,150 -73.8,150 -73.5,150 -73.2,150 -72.9,150 -72.6,150 -72.3,150 -72))"], "date_created": "Wed, 31 Jul 2019 00:00:00 GMT", "description": "The Transantarctic Mountains (TAMs) are the largest non-collisional mountain range on Earth. Their origin, as well as the origin of the Wilkes Subglacial Basin (WSB) along the inland side of the TAMs, have been widely debated, and a key constraint to distinguish between competing models is the underlying crustal structure. Previous investigations have examined this structure but have primarily focused on a small region of the central TAMs near Ross Island, providing little along-strike constraint. In this study, we use data from the new Transantarctic Mountains Northern Network and from five stations operated by the Korea Polar Research Institute to investigate the crustal structure beneath a previously unexplored portion of the TAMs. Using S-wave receiver functions and Rayleigh wave phase velocities, crustal thickness and average crustal shear velocity (\uf8e5Vs) are resolved within \u00b14 km and \u00b10.1 km/s, respectively. The crust thickens from ~20 km near the Ross Sea coast to ~46 km beneath the northern TAMs, which is somewhat thicker than that imaged in previous studies beneath the central TAMs. The crust thins to ~41 km beneath the WSB.\uf8e5Vs ranges from ~3.1-3.9 km/s, with slower velocities near the coast. Our findings are consistent with a flexural origin for the TAMs and WSB, where these features result from broad flexure of the East Antarctic lithosphere and uplift along its western edge due to thermal conduction from hotter mantle beneath West Antarctica. Locally thicker crust may explain the ~1 km of additional topography in the northern TAMs compared to the central TAMs.", "east": 170.0, "geometry": ["POINT(160 -73.5)"], "keywords": "Antarctica; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": -72.0, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Hansen, Samantha", "project_titles": "CAREER: Deciphering the Tectonic History of the Transantarctic Mountains and the Wilkes Subglacial Basin", "projects": [{"proj_uid": "p0000300", "repository": "USAP-DC", "title": "CAREER: Deciphering the Tectonic History of the Transantarctic Mountains and the Wilkes Subglacial Basin"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -75.0, "title": "Crustal Structure beneath the Northern Transantarctic Mountains and Wilkes Subglacial Basin: Implications for Tectonic Origins", "uid": "601194", "west": 150.0}, {"awards": "1758224 Salvatore, Mark", "bounds_geometry": ["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))"], "date_created": "Fri, 15 Mar 2019 00:00:00 GMT", "description": "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 \u0027ground truthing\u0027 of orbital multispectral data.", "east": -150.0, "geometry": ["POINT(180 -85.5)"], "keywords": "Antarctica; Glaciers/ice Sheet; Glaciers/Ice Sheet; Remote Sensing; Rocks; Solid Earth; Spectroscopy; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": -83.0, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Salvatore, Mark", "project_titles": "EAGER: Surface Variability and Spectral Analyses of the Central Transantarctic Mountains, Antarctica", "projects": [{"proj_uid": "p0010020", "repository": "USAP-DC", "title": "EAGER: Surface Variability and Spectral Analyses of the Central Transantarctic Mountains, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -88.0, "title": "Laboratory Hyperspectral Reflectance Data of Central Transantarctic Mountain Rocks and Sediments", "uid": "601163", "west": 150.0}, {"awards": "1341612 Bowser, Samuel", "bounds_geometry": ["POINT(163.5117 -77.57623)"], "date_created": "Wed, 28 Nov 2018 00:00:00 GMT", "description": "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.", "east": 163.5117, "geometry": ["POINT(163.5117 -77.57623)"], "keywords": "Antarctica; Biota; Foraminifera; Heavy Metal Toxicity; Scanning Electron Microscop; Scanning Electron Microscope (SEM) Images; Scanning Electron Microscopy; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": -77.57623, "nsf_funding_programs": "Antarctic Organisms and Ecosystems", "persons": "Bowser, Samuel; Andreas, Amanda", "project_titles": "Assembling and Mining the Genomes of Giant Antarctic Foraminifera", "projects": [{"proj_uid": "p0000004", "repository": "USAP-DC", "title": "Assembling and Mining the Genomes of Giant Antarctic Foraminifera"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.57623, "title": "Scanning electron micrographs: Influence of heavy metal (Pb, Cd) exposure on shell morphogenesis in Astrammina rara, a giant agglutinated Antarctic foraminiferan protist.", "uid": "601138", "west": 163.5117}, {"awards": "1443263 Higgins, John; 1443306 Mayewski, Paul", "bounds_geometry": ["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))"], "date_created": "Wed, 17 Oct 2018 00:00:00 GMT", "description": "Stable water isotope data for the surface ice samples (listed as point numbers \u00ad 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\r\narea(76.73165 to 76.73348 S,\u00a0159.35343 to 159.42112 E).", "east": 159.42112, "geometry": ["POINT(159.387275 -76.732565)"], "keywords": "Allan Hills; Allan Hills Project; Antarctica; Blue Ice; Chemistry:ice; Chemistry:Ice; Delta 18O; Delta Deuterium; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Ice Core Gas Records; Ice Core Records; Oxygen; Snow/ice; Snow/Ice; Stable Water Isotopes; Transantarctic Mountains", "locations": "Antarctica; Allan Hills; Transantarctic Mountains", "north": -76.73165, "nsf_funding_programs": "Antarctic Glaciology; Antarctic Glaciology", "persons": "Kurbatov, Andrei V.; Mayewski, Paul A.; Introne, Douglas; Yan, Yuzhen", "project_titles": "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", "projects": [{"proj_uid": "p0000760", "repository": "USAP-DC", "title": "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"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Allan Hills", "south": -76.73348, "title": "Stable water isotope data for the surface samples collected at the Allan Hills Blue ice area", "uid": "601130", "west": 159.35343}, {"awards": "1443306 Mayewski, Paul; 1443263 Higgins, John", "bounds_geometry": ["POINT(159.35507 -76.73286)"], "date_created": "Wed, 17 Oct 2018 00:00:00 GMT", "description": "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 \r\nstable 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.", "east": 159.35507, "geometry": ["POINT(159.35507 -76.73286)"], "keywords": "Allan Hills; Allan Hills Project; Antarctica; Blue Ice; Delta 18O; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Ice Core; Ice Core Chemistry; Ice Core Records; Isotope Data; Oxygen; Snow/ice; Snow/Ice; Stable Water Isotopes; Transantarctic Mountains", "locations": "Allan Hills; Antarctica; Transantarctic Mountains", "north": -76.73286, "nsf_funding_programs": "Antarctic Glaciology; Antarctic Glaciology", "persons": "Kurbatov, Andrei V.; Mayewski, Paul A.; Introne, Douglas; Yan, Yuzhen", "project_titles": "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", "projects": [{"proj_uid": "p0000760", "repository": "USAP-DC", "title": "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"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Allan Hills", "south": -76.73286, "title": "Stable water isotope data for the AH-1502 ice core drilled at the Allan Hills Blue ice area", "uid": "601129", "west": 159.35507}, {"awards": "1341500 Ryberg, Patricia", "bounds_geometry": null, "date_created": "Tue, 07 Nov 2017 00:00:00 GMT", "description": "Images of Late Permian glossopterid reproductive structures from Allan Hills in the Beardmore Glacier Region of Antarctica.", "east": null, "geometry": null, "keywords": "Antarctica; Biota; Fossil; Sample/collection Description; Sample/Collection Description; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": null, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Ryberg, Patricia", "project_titles": "RUI: Antarctic Paleobotany: Permian Floral Characteristics in a Sedimentary Setting", "projects": [{"proj_uid": "p0010134", "repository": "USAP-DC", "title": "RUI: Antarctic Paleobotany: Permian Floral Characteristics in a Sedimentary Setting"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "Images of Fossil Plants of Antarctica", "uid": "601066", "west": null}, {"awards": "1246170 Hall, Brenda", "bounds_geometry": ["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))"], "date_created": "Mon, 23 Oct 2017 00:00:00 GMT", "description": "Hatherton Glacier Radiocarbon Data", "east": 156.8, "geometry": ["POINT(156.1 -79.9)"], "keywords": "Antarctica; Geochronology; Hatherton Glacier; Radiocarbon; Sample/collection Description; Sample/Collection Description; Transantarctic Mountains", "locations": "Transantarctic Mountains; Hatherton Glacier; Antarctica", "north": -79.8, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Hall, Brenda", "project_titles": "Collaborative Research: Assessing the Antarctic Contribution to Sea-level Changes during the Last Deglaciation: Constraints from Darwin Glacier", "projects": [{"proj_uid": "p0000304", "repository": "USAP-DC", "title": "Collaborative Research: Assessing the Antarctic Contribution to Sea-level Changes during the Last Deglaciation: Constraints from Darwin Glacier"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -80.0, "title": "Hatherton Glacier Radiocarbon Data", "uid": "601063", "west": 155.4}, {"awards": "0839031 Severinghaus, Jeffrey", "bounds_geometry": ["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))"], "date_created": "Fri, 16 Jun 2017 00:00:00 GMT", "description": "Taylor Glacier Gas Isotope Data", "east": 162.14059, "geometry": ["POINT(161.77742 -77.79978)"], "keywords": "Antarctica; Chemistry:ice; Chemistry:Ice; Geochemistry; Glaciology; Ice Core Records; Isotope; Solid Earth; Taylor Glacier; Transantarctic Mountains", "locations": "Antarctica; Taylor Glacier; Transantarctic Mountains", "north": -77.73489, "nsf_funding_programs": null, "persons": "Severinghaus, Jeffrey P.", "project_titles": "Collaborative Research: A \"Horizontal Ice Core\" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica", "projects": [{"proj_uid": "p0000099", "repository": "USAP-DC", "title": "Collaborative Research: A \"Horizontal Ice Core\" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.86467, "title": "Taylor Glacier Gas Isotope Data", "uid": "601033", "west": 161.41425}, {"awards": "1245659 Petrenko, Vasilii", "bounds_geometry": ["POINT(161.71353 -77.75855)"], "date_created": "Wed, 24 May 2017 00:00:00 GMT", "description": "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.", "east": 161.71353, "geometry": ["POINT(161.71353 -77.75855)"], "keywords": "Antarctica; Chemistry:rock; Chemistry:Rock; Critical Zone; Geochemistry; Methane; Paleoclimate; Sample/collection Description; Sample/Collection Description; Solid Earth; Taylor Glacier; Transantarctic Mountains; Younger Dryas", "locations": "Antarctica; Taylor Glacier; Transantarctic Mountains", "north": -77.75855, "nsf_funding_programs": null, "persons": "Petrenko, Vasilii; Severinghaus, Jeffrey P.", "project_titles": "Collaborative Research: A \"Horizontal Ice Core\" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica", "projects": [{"proj_uid": "p0000099", "repository": "USAP-DC", "title": "Collaborative Research: A \"Horizontal Ice Core\" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.75855, "title": "Measurements of 14C-methane for the Younger Dryas - Preboreal Transition from Taylor Glacier, Antarctica", "uid": "601029", "west": 161.71353}, {"awards": "1148982 Hansen, Samantha", "bounds_geometry": ["POLYGON((153.327 -73.032547,154.5063012 -73.032547,155.6856024 -73.032547,156.8649036 -73.032547,158.0442048 -73.032547,159.223506 -73.032547,160.4028072 -73.032547,161.5821084 -73.032547,162.7614096 -73.032547,163.9407108 -73.032547,165.120012 -73.032547,165.120012 -73.3530275,165.120012 -73.673508,165.120012 -73.9939885,165.120012 -74.314469,165.120012 -74.6349495,165.120012 -74.95543,165.120012 -75.2759105,165.120012 -75.596391,165.120012 -75.9168715,165.120012 -76.237352,163.9407108 -76.237352,162.7614096 -76.237352,161.5821084 -76.237352,160.4028072 -76.237352,159.223506 -76.237352,158.0442048 -76.237352,156.8649036 -76.237352,155.6856024 -76.237352,154.5063012 -76.237352,153.327 -76.237352,153.327 -75.9168715,153.327 -75.596391,153.327 -75.2759105,153.327 -74.95543,153.327 -74.6349495,153.327 -74.314469,153.327 -73.9939885,153.327 -73.673508,153.327 -73.3530275,153.327 -73.032547))"], "date_created": "Thu, 20 Apr 2017 00:00:00 GMT", "description": "Using data from the Transantarctic Mountains (TAMs) Northern Network, shear-wave splitting analysis has been employed to constrain azimuthal anisotropy beneath a portion of the northern TAMs. Splitting measurements were made for PKS, SKS, and SKKS phases with the eigenvalue method in SplitLab. The results show two distinct geographic regions of anisotropy: one behind the TAMs front and the other along the Ross Sea coastline. The anisotropic structure behind the TAMs front is best attributed to relict fabric associated with past tectonic episodes. Along the coastline, the anisotropy is interpreted to reflect mantle flow associated with rift-related decompression melting and Cenozoic extension.", "east": 165.120012, "geometry": ["POINT(159.223506 -74.6349495)"], "keywords": "Antarctica; Geology/Geophysics - Other; GPS; Sample/collection Description; Sample/Collection Description; Seismology; Shearwave Spitting; Solid Earth; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": -73.032547, "nsf_funding_programs": null, "persons": "Hansen, Samantha", "project_titles": "CAREER: Deciphering the Tectonic History of the Transantarctic Mountains and the Wilkes Subglacial Basin", "projects": [{"proj_uid": "p0000300", "repository": "USAP-DC", "title": "CAREER: Deciphering the Tectonic History of the Transantarctic Mountains and the Wilkes Subglacial Basin"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -76.237352, "title": "Shear Wave Splitting Analysis and Seismic Anisotropy beneath the Northern Transantarctic Mountains", "uid": "601019", "west": 153.327}, {"awards": "1148982 Hansen, Samantha", "bounds_geometry": ["POLYGON((153.327 -73.032547,154.5063012 -73.032547,155.6856024 -73.032547,156.8649036 -73.032547,158.0442048 -73.032547,159.223506 -73.032547,160.4028072 -73.032547,161.5821084 -73.032547,162.7614096 -73.032547,163.9407108 -73.032547,165.120012 -73.032547,165.120012 -73.3530275,165.120012 -73.673508,165.120012 -73.9939885,165.120012 -74.314469,165.120012 -74.6349495,165.120012 -74.95543,165.120012 -75.2759105,165.120012 -75.596391,165.120012 -75.9168715,165.120012 -76.237352,163.9407108 -76.237352,162.7614096 -76.237352,161.5821084 -76.237352,160.4028072 -76.237352,159.223506 -76.237352,158.0442048 -76.237352,156.8649036 -76.237352,155.6856024 -76.237352,154.5063012 -76.237352,153.327 -76.237352,153.327 -75.9168715,153.327 -75.596391,153.327 -75.2759105,153.327 -74.95543,153.327 -74.6349495,153.327 -74.314469,153.327 -73.9939885,153.327 -73.673508,153.327 -73.3530275,153.327 -73.032547))"], "date_created": "Thu, 20 Apr 2017 00:00:00 GMT", "description": "Using data from the Transantarctic Mountains (TAMs) Northern Network, the shear wave velocity structure beneath the northern TAMs was investigated with surface wave tomography. Rayleigh wave phase velocities were calculated using a two-plane wave approximation and were then inverted for shear velocity structure. The resulting model shows a low velocity zone (~4.24 km/s) at ~160 km depth offshore and adjacent to Mt. Melbourne that extends inland and vertically upwards to ~100 km depth beneath the northern TAMs and Victoria Land. Another low velocity zone (~4.16-4.24 km/s) is also seen at ~150 km depth beneath Ross Island, and relatively slow velocities (~4.24-4.32 km/s) along the Terror Rift connect the two low velocity zones. This structure has been interpreted to reflect rift-related decompression melting along the TAMs front, which would provide thermal buoyancy to uplift the mountain range.", "east": 165.120012, "geometry": ["POINT(159.223506 -74.6349495)"], "keywords": "Antarctica; Geology/Geophysics - Other; Model; Seismology; Solid Earth; Tomography; Transantarctic Mountains", "locations": "Transantarctic Mountains; Antarctica", "north": -73.032547, "nsf_funding_programs": null, "persons": "Hansen, Samantha", "project_titles": "CAREER: Deciphering the Tectonic History of the Transantarctic Mountains and the Wilkes Subglacial Basin", "projects": [{"proj_uid": "p0000300", "repository": "USAP-DC", "title": "CAREER: Deciphering the Tectonic History of the Transantarctic Mountains and the Wilkes Subglacial Basin"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -76.237352, "title": "Upper Mantle Shear Wave Velocity Structure beneath the Northern Transantarctic Mountains", "uid": "601018", "west": 153.327}, {"awards": "1148982 Hansen, Samantha", "bounds_geometry": ["POLYGON((153.327 -73.032547,154.5063012 -73.032547,155.6856024 -73.032547,156.8649036 -73.032547,158.0442048 -73.032547,159.223506 -73.032547,160.4028072 -73.032547,161.5821084 -73.032547,162.7614096 -73.032547,163.9407108 -73.032547,165.120012 -73.032547,165.120012 -73.3530275,165.120012 -73.673508,165.120012 -73.9939885,165.120012 -74.314469,165.120012 -74.6349495,165.120012 -74.95543,165.120012 -75.2759105,165.120012 -75.596391,165.120012 -75.9168715,165.120012 -76.237352,163.9407108 -76.237352,162.7614096 -76.237352,161.5821084 -76.237352,160.4028072 -76.237352,159.223506 -76.237352,158.0442048 -76.237352,156.8649036 -76.237352,155.6856024 -76.237352,154.5063012 -76.237352,153.327 -76.237352,153.327 -75.9168715,153.327 -75.596391,153.327 -75.2759105,153.327 -74.95543,153.327 -74.6349495,153.327 -74.314469,153.327 -73.9939885,153.327 -73.673508,153.327 -73.3530275,153.327 -73.032547))"], "date_created": "Thu, 06 Apr 2017 00:00:00 GMT", "description": "Stretching ~3,500 km across Antarctica, with peak elevations up to 4,500 m, the Transantarctic Mountains (TAMs) are the largest non-compressional mountain range on Earth and represent a tectonic boundary between the East Antarctica (EA) craton and the West Antarctic Rift System. The origin and uplift mechanism associated with the TAMs is controversial, and multiple models have been proposed. Seismic investigations of the TAMs\u0027 subsurface structure can provide key constraints to help evaluate these models, but previous studies have been primarily focused only on the central TAMs near Ross Island. Using data from the new 15-station Transantarctic Mountain Northern Network as well as data from several smaller networks, this study investigates the upper mantle velocity structure beneath a previously unexplored portion of the northern TAMs through regional body wave tomography. Relative travel-times were calculated for 11,182 P-wave and 8,285 S-wave arrivals from 790 and 581 Mw \u2265 5.5 events, respectively, using multi-channel cross correlation, and these data were then inverted for models of the upper mantle seismic structure. Resulting P- and S-wave tomography images reveal two focused low velocity anomalies beneath Ross Island (RI; \u03b4VP \u2248 -2.0%; \u03b4VS \u2248 -1.5% to -4.0%) and Terra Nova Bay (TNB; \u03b4VP \u2248 -1.5% to -2.0%; \u03b4VS \u2248 -1.0% to -4.0%) that extend to depths of ~200 and ~150 km, respectively. The RI and TNB slow anomalies also extend ~50-100 km laterally beneath the TAMs front and sharply abut fast velocities beneath the EA craton (\u03b4VP \u2248 0.5% to 2%; \u03b4VS \u2248 1.5% to 4.0%). A low velocity region (\u03b4VP \u2248 -1.5%), centered at ~150 km depth beneath the Terror Rift (TR) and primarily constrained within the Victoria Land Basin, connects the RI and TNB anomalies. The focused low velocities are interpreted as regions of partial melt and buoyancy-driven upwelling, connected by a broad region of slow (presumably warm) upper mantle associated with Cenozoic extension along the TR. Dynamic topography estimates based on the imaged S-wave velocity perturbations are consistent with observed surface topography in the central and northern TAMs, thereby providing support for uplift models that advocate for thermal loading and a flexural origin for the mountain range.", "east": 165.120012, "geometry": ["POINT(159.223506 -74.6349495)"], "keywords": "Antarctica; Geology/Geophysics - Other; Model; Seismology; Solid Earth; Tomography; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": -73.032547, "nsf_funding_programs": null, "persons": "Hansen, Samantha", "project_titles": "CAREER: Deciphering the Tectonic History of the Transantarctic Mountains and the Wilkes Subglacial Basin", "projects": [{"proj_uid": "p0000300", "repository": "USAP-DC", "title": "CAREER: Deciphering the Tectonic History of the Transantarctic Mountains and the Wilkes Subglacial Basin"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -76.237352, "title": "Upper Mantle Seismic Structure beneath the Northern Transantarctic Mountains from Regional P- and S-wave Tomography", "uid": "601017", "west": 153.327}, {"awards": "1246379 Smith, Nathan", "bounds_geometry": ["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))"], "date_created": "Wed, 29 Mar 2017 00:00:00 GMT", "description": "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).", "east": 166.0, "geometry": ["POINT(163 -86)"], "keywords": "Antarctica; Beardmore Glacier; Biota; Fossil; Sample/collection Description; Sample/Collection Description; Solid Earth; Transantarctic Mountains", "locations": "Beardmore Glacier; Transantarctic Mountains; Antarctica", "north": -85.0, "nsf_funding_programs": null, "persons": "Smith, Nathan", "project_titles": "Collaborative Research: Continued Research on the Jurassic Vertebrate Fauna from the Beardmore Glacier Region of Antarctica", "projects": [{"proj_uid": "p0000083", "repository": "USAP-DC", "title": "Collaborative Research: Continued Research on the Jurassic Vertebrate Fauna from the Beardmore Glacier Region of Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -87.0, "title": "Vertebrate fossils from the Hanson Formation at Mt. Kirkpatrick, in the Beardmore Glacier region of Antarctica", "uid": "601016", "west": 160.0}, {"awards": "0947821 Ashworth, Allan", "bounds_geometry": ["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))"], "date_created": "Tue, 17 Jan 2017 00:00:00 GMT", "description": null, "east": 166.66396, "geometry": ["POINT(166.625945 -85.11986)"], "keywords": "Antarctica; Beardmore Glacier; Biota; Fossil; GPS; Oliver Bluffs; Paleoclimate; Sample/collection Description; Sample/Collection Description; Seeds; Solid Earth; Transantarctic Mountains", "locations": "Antarctica; Beardmore Glacier; Oliver Bluffs; Transantarctic Mountains", "north": -85.11733, "nsf_funding_programs": null, "persons": "Ashworth, Allan", "project_titles": "Neogene Paleoecology of the Beardmore Glacier Region", "projects": [{"proj_uid": "p0000424", "repository": "USAP-DC", "title": "Neogene Paleoecology of the Beardmore Glacier Region"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -85.12239, "title": "Neogene Paleoecology of the Beardmore Glacier Region", "uid": "600387", "west": 166.58793}, {"awards": "1043554 Willenbring, Jane", "bounds_geometry": ["POINT(161.5 -77.5)"], "date_created": "Wed, 09 Nov 2016 00:00:00 GMT", "description": "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.\nThis 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.", "east": 161.5, "geometry": ["POINT(161.5 -77.5)"], "keywords": "Antarctica; Chemistry:rock; Chemistry:Rock; Cosmogenic Radionuclides; Geochronology; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Isotope; Sample/collection Description; Sample/Collection Description; Transantarctic Mountains", "locations": "Transantarctic Mountains; Antarctica", "north": -77.5, "nsf_funding_programs": null, "persons": "Willenbring, Jane", "project_titles": "Collaborative Research: Activation of high-elevation alluvial fans in the Transantarctic Mountains - a proxy for Plio-Pleistocene warmth along East Antarctic ice margins", "projects": [{"proj_uid": "p0000429", "repository": "USAP-DC", "title": "Collaborative Research: Activation of high-elevation alluvial fans in the Transantarctic Mountains - a proxy for Plio-Pleistocene warmth along East Antarctic ice margins"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.5, "title": "Activation of high-elevation alluvial fans in the Transantarctic Mountains - a proxy for Plio-Pleistocene warmth along East Antarctic ice margins", "uid": "600379", "west": 161.5}, {"awards": "0839031 Severinghaus, Jeffrey", "bounds_geometry": ["POINT(161.71965 -77.76165)"], "date_created": "Fri, 01 Jan 2016 00:00:00 GMT", "description": "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 \u0027clathrate hypothesis\u0027 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 (\u003e1 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 \u0027horizontal ice core\u0027 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.", "east": 161.71965, "geometry": ["POINT(161.71965 -77.76165)"], "keywords": "Antarctica; Cosmogenic; Geochemistry; Ice Core Records; Paleoclimate; Radiocarbon; Taylor Glacier; Transantarctic Mountains", "locations": "Taylor Glacier; Transantarctic Mountains; Antarctica", "north": -77.76165, "nsf_funding_programs": null, "persons": "Severinghaus, Jeffrey P.", "project_titles": "Collaborative Research: A \"Horizontal Ice Core\" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica", "projects": [{"proj_uid": "p0000099", "repository": "USAP-DC", "title": "Collaborative Research: A \"Horizontal Ice Core\" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.76165, "title": "Measurements of in situ cosmogenic 14C from Taylor Glacier, Antarctica", "uid": "600165", "west": 161.71965}, {"awards": "1245821 Brook, Edward J.", "bounds_geometry": ["POINT(162.167 -77.733)"], "date_created": "Fri, 01 Jan 2016 00:00:00 GMT", "description": "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.", "east": 162.167, "geometry": ["POINT(162.167 -77.733)"], "keywords": "Antarctica; Atmosphere; Geochemistry; Ice Core Records; Isotope; Paleoclimate; Taylor Glacier; Transantarctic Mountains", "locations": "Transantarctic Mountains; Antarctica; Taylor Glacier", "north": -77.733, "nsf_funding_programs": null, "persons": "Brook, Edward J.", "project_titles": "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", "projects": [{"proj_uid": "p0000283", "repository": "USAP-DC", "title": "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"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.733, "title": "The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive", "uid": "600163", "west": 162.167}, {"awards": "0944282 Hasiotis, Stephen", "bounds_geometry": ["POINT(175 -86)"], "date_created": "Fri, 01 Jan 2016 00:00:00 GMT", "description": "This proposal will study the diversity, abundance, and tiering patterns of ichnofossils in continental and marine deposits of the Beacon Supergroup in the Beardmore Glacier Area (BGA). The PIs will focus on continental strata that contain a variety of ichnofossils and paleosols. Ichnofossils will be evaluated for their architectural and surficial morphologies, and will be compared to modern and ancient traces to interpret the tracemaker behavior and paleoenvironmental setting. Distribution of ichnofossils within these units may indicate the effect of lateral variability of pedogenesis, the magnitude and frequency of depositional events, and the amount of moisture within the sediment, as well as the effects of climate change. The paleoclimatic significance of ichnofossils will be determined by comparing the burrow size, occurrence, tiering, and pedogenic significance of ichnofossils in measured sections of stratigraphic units deposited during global warming and cooling episodes. Comparisons will be made between BGA formations to stratigraphically equivalent rocks deposited at low paleolatitudes with previously determined paleoclimatic settings. The objectives of this project are to address two major questions: what differences existed in ichnodiversity, abundance, and tiering in marine and continental deposits between high- and low-paleolatitudes, and was there a dearth of habitat usage in continental deposits during the late Paleozoic and Mesozoic, particularly in fluvial and lacustrine environments compared to the habitat usage in the marine realm at that time?\nThis study will enhance the ability to interpret paleoenvironments to the subenvironmental scale, understand the evolution of soil biota and ecosystems at high paleolatitudes, determine the role of organisms in soil formation at high paleolatitudes, explore the effects of climate change on the body size and diversity of organisms in the soil communities, and develop new tools to interpret paleoclimate in high latitudes. There is a strong education component associated with this proposal.", "east": 175.0, "geometry": ["POINT(175 -86)"], "keywords": "Antarctica; Beardmore Glacier; Biota; Fossil; Paleoclimate; Sample/collection Description; Sample/Collection Description; Solid Earth; Transantarctic Mountains", "locations": "Transantarctic Mountains; Beardmore Glacier; Antarctica", "north": -86.0, "nsf_funding_programs": null, "persons": "Hasiotis, Stephen", "project_titles": "Paleoenvironmental and Paleoclimatic Analysis of the Beacon Supergroup, Beardmore Glacier Area, Central Transantarctic Mountains, Antarctica", "projects": [{"proj_uid": "p0000423", "repository": "USAP-DC", "title": "Paleoenvironmental and Paleoclimatic Analysis of the Beacon Supergroup, Beardmore Glacier Area, Central Transantarctic Mountains, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -86.0, "title": "Paleoenvironmental and Paleoclimatic Analysis of the Beacon Supergroup, Beardmore Glacier Area, Central Transantarctic Mountains, Antarctica", "uid": "600156", "west": 175.0}, {"awards": "1146399 Sidor, Christian", "bounds_geometry": ["POLYGON((162.41 -84.27,163.409 -84.27,164.408 -84.27,165.407 -84.27,166.406 -84.27,167.405 -84.27,168.404 -84.27,169.403 -84.27,170.402 -84.27,171.401 -84.27,172.4 -84.27,172.4 -84.353,172.4 -84.436,172.4 -84.519,172.4 -84.602,172.4 -84.685,172.4 -84.768,172.4 -84.851,172.4 -84.934,172.4 -85.017,172.4 -85.1,171.401 -85.1,170.402 -85.1,169.403 -85.1,168.404 -85.1,167.405 -85.1,166.406 -85.1,165.407 -85.1,164.408 -85.1,163.409 -85.1,162.41 -85.1,162.41 -85.017,162.41 -84.934,162.41 -84.851,162.41 -84.768,162.41 -84.685,162.41 -84.602,162.41 -84.519,162.41 -84.436,162.41 -84.353,162.41 -84.27))"], "date_created": "Thu, 01 Jan 2015 00:00:00 GMT", "description": "The PI requests support for preparation of a large collection of vertebrate fossils recently recovered from the Central Transantarctic Mountains (CTAM) of Antarctica. These fossils will be used to place early Mesozoic Antarctic dinosaurs and other vertebrates into a global evolutionary, biogeographic, and faunal context; assess the degree of endemism in Triassic vertebrate faunas of Antarctica; constrain temporal relationships of the Triassic Antarctic vertebrate faunas; and refine the stratigraphic context for the Triassic Antarctic vertebrate assemblages to establish a paleoenvironmental framework. The lower and middle Triassic fossils offer a rare window on life in terrestrial environments at high-latitudes immediately after the Permian mass extinction.\n\nThe PI will use their fossils to educate the public about the geologic, climatic, and biologic history of Antarctica by visiting local schools. They will create and publish at least two new videos to the Burke Museum blog that relate the graduate student\u0027s experience of fieldwork in Antarctica. They will also update the Antarctica section on the UWBM \u0027Explore Your World\u0027 website with images and findings from their field season.\n", "east": 172.4, "geometry": ["POINT(167.405 -84.685)"], "keywords": "Antarctica; Biota; Fossil; Paleoclimate; Sample/collection Description; Sample/Collection Description; Solid Earth; Transantarctic Mountains; Triassic", "locations": "Antarctica; Transantarctic Mountains", "north": -84.27, "nsf_funding_programs": null, "persons": "Sidor, Christian", "project_titles": "Preparation of Vertebrate Fossils from the Triassic of Antarctica", "projects": [{"proj_uid": "p0000418", "repository": "USAP-DC", "title": "Preparation of Vertebrate Fossils from the Triassic of Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -85.1, "title": "Preparation of Vertebrate Fossils from the Triassic of Antarctica", "uid": "600144", "west": 162.41}, {"awards": "1354231 Kowalewski, Douglas", "bounds_geometry": ["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))"], "date_created": "Wed, 01 Jan 2014 00:00:00 GMT", "description": "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.\n", "east": -120.0, "geometry": ["POINT(-140 -77.5)"], "keywords": "Antarctica; Atmosphere; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Model Data; Paleoclimate; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": -70.0, "nsf_funding_programs": null, "persons": "Kowalewski, Douglas", "project_titles": "Validating contrasting terrestrial climate-sensitive Pliocene deposits through high resolution modeling of paleo-environments in the Transantarctic Mountains", "projects": [{"proj_uid": "p0000463", "repository": "USAP-DC", "title": "Validating contrasting terrestrial climate-sensitive Pliocene deposits through high resolution modeling of paleo-environments in the Transantarctic Mountains"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -85.0, "title": "Validating contrasting terrestrial climate-sensitive Pliocene deposits through high resolution modeling of paleo-environments in the Transantarctic Mountains", "uid": "600140", "west": -160.0}, {"awards": "1244253 Hammer, William", "bounds_geometry": ["POLYGON((-165 -85,-164.5 -85,-164 -85,-163.5 -85,-163 -85,-162.5 -85,-162 -85,-161.5 -85,-161 -85,-160.5 -85,-160 -85,-160 -85.2,-160 -85.4,-160 -85.6,-160 -85.8,-160 -86,-160 -86.2,-160 -86.4,-160 -86.6,-160 -86.8,-160 -87,-160.5 -87,-161 -87,-161.5 -87,-162 -87,-162.5 -87,-163 -87,-163.5 -87,-164 -87,-164.5 -87,-165 -87,-165 -86.8,-165 -86.6,-165 -86.4,-165 -86.2,-165 -86,-165 -85.8,-165 -85.6,-165 -85.4,-165 -85.2,-165 -85))"], "date_created": "Wed, 01 Jan 2014 00:00:00 GMT", "description": "This proposal requests support for research on Early Jurassic vertebrate fauna of the Beardmore Glacier region of Antarctica. The project will support 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 will generate 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 will be 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.\n\nThe 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. The PIs will develop a traveling exhibit on Antarctic Mesozoic paleontology that they estimate will be seen by 2.5 million people over the five-year tour.\n", "east": -160.0, "geometry": ["POINT(-162.5 -86)"], "keywords": "Antarctica; Beardmore Glacier; Biota; Dinosaurs; Fossil; Transantarctic Mountains", "locations": "Beardmore Glacier; Transantarctic Mountains; Antarctica", "north": -85.0, "nsf_funding_programs": null, "persons": "Hammer, William R.", "project_titles": "Collaborative Research: Continued Research on the Jurassic Vertebrate Fauna from the Beardmore Glacier Region of Antarctica", "projects": [{"proj_uid": "p0000083", "repository": "USAP-DC", "title": "Collaborative Research: Continued Research on the Jurassic Vertebrate Fauna from the Beardmore Glacier Region of Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -87.0, "title": "Continued Research on the Jurassic Vertebrate Fauna from the Beardmore Glacier Region of Antarctica", "uid": "600173", "west": -165.0}, {"awards": "1043700 Harry, Dennis", "bounds_geometry": ["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))"], "date_created": "Wed, 01 Jan 2014 00:00:00 GMT", "description": "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.\n", "east": 180.0, "geometry": ["POINT(0 -89.999)"], "keywords": "Andrill; Antarctica; Continental Rift; Geology/Geophysics - Other; Lithosphere; Model; Ross Sea; Solid Earth; Tectonic; Transantarctic Mountains", "locations": "Antarctica; Ross Sea; Transantarctic Mountains", "north": -60.0, "nsf_funding_programs": null, "persons": "Harry, Dennis L.", "project_titles": "Geodynamic Models of Subsidence and Lithospheric Flexure at the ANDRILL Drill Sites: Implications for Cenozoic Tectonics and Ice Sheet History", "projects": [{"proj_uid": "p0000467", "repository": "USAP-DC", "title": "Geodynamic Models of Subsidence and Lithospheric Flexure at the ANDRILL Drill Sites: Implications for Cenozoic Tectonics and Ice Sheet History"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "ANDRILL", "south": -90.0, "title": "Geodynamic Models of Subsidence and Lithospheric Flexure at the ANDRILL Drill Sites: Implications for Cenozoic Tectonics and Ice Sheet History", "uid": "600128", "west": -180.0}, {"awards": "0944475 Kaplan, Michael", "bounds_geometry": ["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))"], "date_created": "Wed, 01 Jan 2014 00:00:00 GMT", "description": "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\u0027s 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 \u003c2mm 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.\nBroader 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.", "east": -149.7, "geometry": ["POINT(-174.25 -85.75)"], "keywords": "Antarctica; Cosmogenic Dating; Sample/collection Description; Sample/Collection Description; Solid Earth; Transantarctic Mountains", "locations": "Transantarctic Mountains; Antarctica", "north": -84.1, "nsf_funding_programs": null, "persons": "Kaplan, Michael", "project_titles": "Collaborative Research: Pleistocene East Antarctic Ice Sheet History as Recorded in Sediment Provenance and Chronology of High-elevation TAM Moraines", "projects": [{"proj_uid": "p0000459", "repository": "USAP-DC", "title": "Collaborative Research: Pleistocene East Antarctic Ice Sheet History as Recorded in Sediment Provenance and Chronology of High-elevation TAM Moraines"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -87.4, "title": "Pleistocene East Antarctic Ice Sheet History as Recorded in Sediment Provenance and Chronology of High-elevation TAM Moraines", "uid": "600115", "west": 161.2}, {"awards": "0838970 Foreman, Christine", "bounds_geometry": ["POINT(161.667 -77.117)"], "date_created": "Wed, 01 Jan 2014 00:00:00 GMT", "description": "Dissolved organic matter (DOM) comprises a significant pool of Earth\u0027s 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\u0027 schools and Native American programs. Additional outreach will be carried out in coordination with PolarTREC, PolarPalooza, and if possible, an Antarctic Artist and Writer.\n", "east": 161.667, "geometry": ["POINT(161.667 -77.117)"], "keywords": "Antarctica; Biota; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Microbiology", "locations": "Antarctica", "north": -77.117, "nsf_funding_programs": null, "persons": "Foreman, Christine", "project_titles": "Collaborative Research: The Biogeochemical Evolution of Dissolved Organic Matter in a Fluvial System on the Cotton Glacier, Antarctica", "projects": [{"proj_uid": "p0000458", "repository": "USAP-DC", "title": "Collaborative Research: The Biogeochemical Evolution of Dissolved Organic Matter in a Fluvial System on the Cotton Glacier, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.117, "title": "The Biogeochemical Evolution of Dissolved Organic Matter in a Fluvial System on the Cotton Glacier, Antarctica", "uid": "600104", "west": 161.667}, {"awards": "1039365 Rimmer, Susan", "bounds_geometry": null, "date_created": "Tue, 01 Jan 2013 00:00:00 GMT", "description": "This project studies the Permian-Triassic extinction event as recorded in sedimentary rocks from the Transantarctic Mountains of Antarctica. Two hundred and fifty million years ago most life on Earth was wiped out in a geologic instant. The cause is a subject of great debate. Researchers have identified a unique stratigraphic section near Shackleton glacier laid down during the extinction event. Organic matter from these deposits will be analyzed by density gradient centrifugation (DGC), which will offer detailed information on the carbon isotope composition. The age of these layers will be precisely dated by U/Pb-zircon-dating of intercalated volcanics. Combined, these results will offer detailed constraints on the timing and duration of carbon isotope excursions during the extinction, and offer insight into the coupling of marine and terrestrial carbon cycles. The broader impacts of this project include graduate and undergraduate student research, K12 outreach and teacher involvement, and societal relevance of the results, since the P/T extinction may have been caused by phenomena such as methane release, which could accompany global warming.\n", "east": null, "geometry": null, "keywords": "Antarctica; Chemistry:rock; Chemistry:Rock; Geochemistry; Solid Earth; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": null, "nsf_funding_programs": null, "persons": "Rimmer, Susan", "project_titles": "Collaborative Research: The Permian -Triassic Transition in Antarctica: Evaluating the Rates and Variability of Carbon Isotope Fluctuatios in Terrestrial Organic Matter", "projects": [{"proj_uid": "p0000507", "repository": "USAP-DC", "title": "Collaborative Research: The Permian -Triassic Transition in Antarctica: Evaluating the Rates and Variability of Carbon Isotope Fluctuatios in Terrestrial Organic Matter"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "The Permian-Triassic Transition in Antarctica: Evaluating the Rates and Variability of Carbon Isotope Fluctuations in Terrestrial Organic Matter", "uid": "600121", "west": null}, {"awards": "0838914 Wannamaker, Philip", "bounds_geometry": ["POLYGON((141.01732 -82.13,144.910279 -82.13,148.803238 -82.13,152.696197 -82.13,156.589156 -82.13,160.482115 -82.13,164.375074 -82.13,168.268033 -82.13,172.160992 -82.13,176.053951 -82.13,179.94691 -82.13,179.94691 -82.351835,179.94691 -82.57367,179.94691 -82.795505,179.94691 -83.01734,179.94691 -83.239175,179.94691 -83.46101,179.94691 -83.682845,179.94691 -83.90468,179.94691 -84.126515,179.94691 -84.34835,176.053951 -84.34835,172.160992 -84.34835,168.268033 -84.34835,164.375074 -84.34835,160.482115 -84.34835,156.589156 -84.34835,152.696197 -84.34835,148.803238 -84.34835,144.910279 -84.34835,141.01732 -84.34835,141.01732 -84.126515,141.01732 -83.90468,141.01732 -83.682845,141.01732 -83.46101,141.01732 -83.239175,141.01732 -83.01734,141.01732 -82.795505,141.01732 -82.57367,141.01732 -82.351835,141.01732 -82.13))"], "date_created": "Sun, 01 Jan 2012 00:00:00 GMT", "description": "The investigators will examine competing hypotheses for the mechanism of extension and creation of the Transantarctic Mountains, and evolution of the thermal regimes of rifted West Antarctica and stable East Antarctica using magnetotelluric (MT) profiles. Surrounded almost entirely by ocean ridges, Antarctica is a special tectonic situation because of the need to make accommodation space for rifting in the Transantarctic region. In the MT method, temporal variations in the Earth\u0027s natural electromagnetic field are used as source fields to probe the electrical resistivity structure in the depth range of 1 to 200 km, or more. Geophysical methods, such as MT, are appropriate in Antarctica because of the predominance of thick ice cover over most of the Continent and the difficult operating environment. The proposed effort will consist of approximately 50 sites over a distance approaching 500 km with a 10 km average spacing, oriented normal to the Transantarctic Mountains (TAM), in the Beardmore glacier area. High quality MT soundings will be collected over thick ice sheets using a custom electrode preamp design, updated from previous Antarctic projects. Data acquisition will take place over two field seasons. The primary goals are three-fold: to establish the location of the deeper tectonic transition between East and West Antarctica that may be offset from the physiographic transition at the surface, using deep resistivity structure distinguish between modes of extensional upwelling and magmatism that may be vertically non-uniform, depth and magnitude of quasi-layered deep crustal low resistivity, particularly below West Antarctica, will be used to estimate crustal heat flux into the ice sheet base.\n", "east": 179.94691, "geometry": ["POINT(160.482115 -83.239175)"], "keywords": "Antarctica; Magnetotelluric; Potential Field; Solid Earth; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": -82.13, "nsf_funding_programs": null, "persons": "Wannamaker, Philip", "project_titles": "Rift Mechanisms and Thermal Regime of the Lithosphere across Beardmore Glacier Region, Central Transantarctic Mountains, from Magnetotelluric Measurements", "projects": [{"proj_uid": "p0000247", "repository": "USAP-DC", "title": "Rift Mechanisms and Thermal Regime of the Lithosphere across Beardmore Glacier Region, Central Transantarctic Mountains, from Magnetotelluric Measurements"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -84.34835, "title": "Rift Mechanisms and Thermal Regime of the Lithosphere across Beardmore Glacier Region, Central Transantarctic Mountains, from Magnetotelluric Measurements", "uid": "600102", "west": 141.01732}, {"awards": "0739781 Blythe, Ann", "bounds_geometry": ["POLYGON((155.77667 -79.793335,156.208836 -79.793335,156.641002 -79.793335,157.073168 -79.793335,157.505334 -79.793335,157.9375 -79.793335,158.369666 -79.793335,158.801832 -79.793335,159.233998 -79.793335,159.666164 -79.793335,160.09833 -79.793335,160.09833 -79.8578345,160.09833 -79.922334,160.09833 -79.9868335,160.09833 -80.051333,160.09833 -80.1158325,160.09833 -80.180332,160.09833 -80.2448315,160.09833 -80.309331,160.09833 -80.3738305,160.09833 -80.43833,159.666164 -80.43833,159.233998 -80.43833,158.801832 -80.43833,158.369666 -80.43833,157.9375 -80.43833,157.505334 -80.43833,157.073168 -80.43833,156.641002 -80.43833,156.208836 -80.43833,155.77667 -80.43833,155.77667 -80.3738305,155.77667 -80.309331,155.77667 -80.2448315,155.77667 -80.180332,155.77667 -80.1158325,155.77667 -80.051333,155.77667 -79.9868335,155.77667 -79.922334,155.77667 -79.8578345,155.77667 -79.793335))"], "date_created": "Sun, 01 Jan 2012 00:00:00 GMT", "description": "This project studies formation of the TransAntarctic Mountains (TAM) through numerical modeling based on cooling histories of apatite mineral grains. The TAM are the highest and longest rift-related mountain range in the world. Various models for their uplift have been proposed, the most provocative of which is that they are not uplifted, but instead are the eroded remnant of a plateau. This project evaluates that hypothesis by collecting apatites from around Byrd Glacier for fission track thermochronology. Results will be combined with a kinematic and thermal model to determine the TAM\u0027s structural evolution. The plateau model, if correct, implies that the Byrd Glacier originated not as a glacier-carved valley through the TAM, but as a river system flowing in the opposite direction. Given that the Byrd Glacier is a key drainage for the East Antarctic ice sheet, this result has important implications for ice sheet models and interpretation of both regional geology and sediment records. The main broader impacts are undergraduate research and a new collaboration between a primarily undergraduate and a research institution. Students will be involved in the field program, sample analyses, and numerical modeling.", "east": 160.09833, "geometry": ["POINT(157.9375 -80.1158325)"], "keywords": "Antarctica; Fission Track Thermochronology; Geochemistry; Solid Earth; Transantarctic Mountains", "locations": "Antarctica; Transantarctic Mountains", "north": -79.793335, "nsf_funding_programs": null, "persons": "Blythe, Ann Elizabeth; Huerta, Audrey D.", "project_titles": "Collaborative Research: Thermochronologic and modelling test for a Mesozoic West Antarctic Plateau", "projects": [{"proj_uid": "p0000677", "repository": "USAP-DC", "title": "Collaborative Research: Thermochronologic and modelling test for a Mesozoic West Antarctic Plateau"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -80.43833, "title": "Thermochronologic and modelling test for a Mesozoic West Antarctic Plateau", "uid": "600082", "west": 155.77667}, {"awards": "0739693 Ashworth, Allan", "bounds_geometry": ["POLYGON((160 -77,160.2 -77,160.4 -77,160.6 -77,160.8 -77,161 -77,161.2 -77,161.4 -77,161.6 -77,161.8 -77,162 -77,162 -77.1,162 -77.2,162 -77.3,162 -77.4,162 -77.5,162 -77.6,162 -77.7,162 -77.8,162 -77.9,162 -78,161.8 -78,161.6 -78,161.4 -78,161.2 -78,161 -78,160.8 -78,160.6 -78,160.4 -78,160.2 -78,160 -78,160 -77.9,160 -77.8,160 -77.7,160 -77.6,160 -77.5,160 -77.4,160 -77.3,160 -77.2,160 -77.1,160 -77))"], "date_created": "Thu, 01 Jan 2009 00:00:00 GMT", "description": "This project studies the last vestiges of life in Antarctica from exceptionally well-preserved fossils of tundra life--mosses, diatoms, ostracods, Nothofagus leaves, wood, and insect remains recently discovered in ancient lake sediments from the McMurdo Dry Valleys. The area will be studied by an interdisciplinary team to elucidate information about climate and biogeography. These deposits offer unique and direct information about the characteristics of Antarctica during a key period in its history, the time when it was freezing. This information is critical for correlation with indirect proxies, such as though obtained from drill cores, for climate and state of the ice sheet. The results will also help understand the origin and migration of similar organisms found in South America, India and Australia. In terms of broader impacts, this project supports an early career researcher, undergraduate and graduate student research, various forms of outreach to K12 students, and extensive international collaboration. The work also has societal relevance in that the outcomes will offer direct constraints on Antarctica\u0027s ice sheet during a time with atmospheric CO2 contents similar to those of the earth in the coming centuries, and thus may help predictive models of sea level rise.", "east": 162.0, "geometry": ["POINT(161 -77.5)"], "keywords": "Antarctica; Geochronology; Geology/Geophysics - Other; GPS; Solid Earth", "locations": "Antarctica", "north": -77.0, "nsf_funding_programs": null, "persons": "Ashworth, Allan; Lewis, Adam", "project_titles": "Collaborative Research: Integrating Geomorphological and Paleoecological Studies to Reconstruct Neogene Environments of the Transantarctic Mountains", "projects": [{"proj_uid": "p0000188", "repository": "USAP-DC", "title": "Collaborative Research: Integrating Geomorphological and Paleoecological Studies to Reconstruct Neogene Environments of the Transantarctic Mountains"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.0, "title": "Integrating Geomorphological and Paleoecological Studies to Reconstruct Neogene Environments of the Transantarctic Mountains", "uid": "600081", "west": 160.0}, {"awards": "8411018 Frisic, David; 8613786 Mayewski, Paul", "bounds_geometry": ["POINT(162.5 -77.61667)"], "date_created": "Thu, 26 Aug 2004 00:00:00 GMT", "description": "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.", "east": 162.5, "geometry": ["POINT(162.5 -77.61667)"], "keywords": "Antarctica; Chemistry:ice; Chemistry:Ice; Geochemistry; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Ice Core Records; Newall Glacier; Paleoclimate; Physical Properties; Snow/ice; Snow/Ice; Statigraphy", "locations": "Newall Glacier; Antarctica", "north": -77.61667, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Welch, Kathy A.; Mayewski, Paul A.", "project_titles": "Characterization of Climatic Events for the Last 2 x 103y through the Retrieval of Ice Cores from the Transantarctic Mountains, Antarctica", "projects": [{"proj_uid": "p0000169", "repository": "USAP-DC", "title": "Characterization of Climatic Events for the Last 2 x 103y through the Retrieval of Ice Cores from the Transantarctic Mountains, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.61667, "title": "Newall Glacier Ice Core and Snow Pit Beta Profiles, Chemistry, and Stratigraphy", "uid": "609249", "west": 162.5}, {"awards": "8411018 Frisic, David; 8613786 Mayewski, Paul", "bounds_geometry": ["POINT(166.16667 -85.25)"], "date_created": "Thu, 26 Aug 2004 00:00:00 GMT", "description": "This data set includes beta profiles, chemistry, and density data obtained from Dominion Range ice cores. The Dominion Range is on the East Antarctic Ice Sheet. The chemistry data consists of the composition of oxygen-isotopes and trapped gasses. Other information includes ice thickness, mean annual net accumulation, and crystal size. The core samples were collected in the austral summer of 1984-85. \n", "east": 166.16667, "geometry": ["POINT(166.16667 -85.25)"], "keywords": "Antarctica; Beta Profiles; Chemistry:ice; Chemistry:Ice; Density; Dominion Range; Geochemistry; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Ice Core Records; Paleoclimate; Physical Properties", "locations": "Antarctica; Dominion Range", "north": -85.25, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Sowers, Todd A.; Saltzman, Eric; Watson, M. Scott; Grootes, Pieter; Mayewski, Paul A.; Meese, Deb; Gow, Tony", "project_titles": "Characterization of Climatic Events for the Last 2 x 103y through the Retrieval of Ice Cores from the Transantarctic Mountains, Antarctica", "projects": [{"proj_uid": "p0000169", "repository": "USAP-DC", "title": "Characterization of Climatic Events for the Last 2 x 103y through the Retrieval of Ice Cores from the Transantarctic Mountains, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -85.25, "title": "Dominion Range Ice Core Beta Profiles, Chemistry, and Density Data", "uid": "609248", "west": 166.16667}, {"awards": "XXXXXXX Palais, Julie", "bounds_geometry": ["POINT(158 -77)"], "date_created": "Mon, 18 Aug 2003 00:00:00 GMT", "description": "The collection site is Taylor Dome, an ice-accumulation area on the East Antarctic ice sheet. The dome is a ridge about 20 x 80 km, which lies inland of the Transantarctic Mountains. Deep drilling by the Polar Ice Coring Office (PICO) at Taylor Dome reached bedrock at a depth of 554 meters during the 1993-1994 austral summer season.\n\n\u003cp\u003eThis data set includes mesurements of:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eberyllium-10 (betd.txt)\u003c/li\u003e\n\u003cli\u003eoxygen isotopes (hi18o_td.txt and lo18o_td.txt)\u003c/li\u003e\n\u003cli\u003edeuterium isotopes (deld_20cm.txt and deld_td.txt).\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eThese data were produced at the University of Washington from samples obtained in the field and via the University of New Hampshire automatic melting system. For beryllium, deuterium, and 20-cm oxygen isotope data, the st9810 ice age (kyB1950) timescale is used. For 0.5- to 1-m oxygen isotope data, the st9507 is used.\u003c/p\u003e", "east": 158.0, "geometry": ["POINT(158 -77)"], "keywords": "Antarctica; Chemistry:ice; Chemistry:Ice; Geochemistry; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Ice Core Records; Isotope; Paleoclimate; Taylor Dome; Taylor Dome Ice Core", "locations": "Antarctica; Taylor Dome", "north": -77.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Steig, Eric J.; White, James", "project_titles": null, "projects": null, "repositories": null, "science_programs": "Taylor Dome Ice Core", "south": -77.0, "title": "Taylor Dome Ice Core Data", "uid": "609132", "west": 158.0}, {"awards": "XXXXXXX Palais, Julie", "bounds_geometry": ["POINT(162 -77)"], "date_created": "Fri, 01 Jan 1999 00:00:00 GMT", "description": "Snow pit and ice core data from the Newall Glacier (location - 162 30\u0027\nEast, 77 35\u0027 South) were collected during 1987 and 1988. These include\ninformation on chemistry, Beta profiles and stratigraphy. Ice cores\nwere collected during the austral summer of 1988-1989 and contain\ninformation on chemistry, Pb- 210 profiles, density profiles and\ntemperature profiles. Core A was 175 meters long and core B was 150\nmeters long.\n\nThe snow pits were dug and sampled by the Glacier Research Group\n(GRG), using established protocols to prevent contamination. The\nsamples for major ion chemistry remained frozen until melted for\nanalysis in the GRG lab, located at the University of New Hampshire\n(UNH), and all core processing was done by GRG established protocols\nto prevent contamination. Major ions were analyzed using suppressed\nion chromatography.", "east": 162.0, "geometry": ["POINT(162 -77)"], "keywords": "Antarctica; Chemistry:ice; Chemistry:Ice; Geochemistry; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; Ice Core Records; Newall Glacier; Paleoclimate; Snow/ice; Snow/Ice", "locations": "Newall Glacier; Antarctica", "north": -77.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Mayewski, Paul A.; Whitlow, Sallie", "project_titles": "Characterization of Climatic Events for the Last 2 x 103y through the Retrieval of Ice Cores from the Transantarctic Mountains, Antarctica", "projects": [{"proj_uid": "p0000169", "repository": "USAP-DC", "title": "Characterization of Climatic Events for the Last 2 x 103y through the Retrieval of Ice Cores from the Transantarctic Mountains, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.0, "title": "Newall Glacier Snow Pit and Ice Core, 1987 to 1989", "uid": "609088", "west": 162.0}]

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