{"dp_type": "Dataset", "free_text": "Ross Ice Sheet"}
[{"awards": "0124014 Hall, Brenda", "bounds_geometry": ["POLYGON((163.053 -77.599,163.0741 -77.599,163.0952 -77.599,163.1163 -77.599,163.1374 -77.599,163.1585 -77.599,163.1796 -77.599,163.2007 -77.599,163.2218 -77.599,163.24290000000002 -77.599,163.264 -77.599,163.264 -77.60130000000001,163.264 -77.6036,163.264 -77.6059,163.264 -77.6082,163.264 -77.6105,163.264 -77.61280000000001,163.264 -77.6151,163.264 -77.6174,163.264 -77.6197,163.264 -77.622,163.24290000000002 -77.622,163.2218 -77.622,163.2007 -77.622,163.1796 -77.622,163.1585 -77.622,163.1374 -77.622,163.1163 -77.622,163.0952 -77.622,163.0741 -77.622,163.053 -77.622,163.053 -77.6197,163.053 -77.6174,163.053 -77.6151,163.053 -77.61280000000001,163.053 -77.6105,163.053 -77.6082,163.053 -77.6059,163.053 -77.6036,163.053 -77.60130000000001,163.053 -77.599))"], "date_created": "Wed, 09 Jul 2025 00:00:00 GMT", "description": "Physical and chemical properties of sediment cores from Lake Fryxell, Antarctica, provide a means of reconstructing past paleoenvironmental, water-level, and water-source changes over the last 60,000 years. This dataset includes stable isotope (O, C), radiocarbon, U-series, sedimentological, and loss-on-ignition data. The oxygen data relate primarily to water-source changes in the lake basin. Carbon (both stable and radioactive) isotopes are influenced heavily by lake stratification and depth of the photic zone. The data record surface level changes of Lake Fryxell over the past 60,000 years. In addition, the dated sediments constrain the Ross Sea ice sheet to east of (seaward of) the lake through that entire time. Finally, stable oxygen isotopes document water source changes switching from local alpine glacier meltwater to Ross Sea ice sheet meltwater and then back to local glacier meltwater.", "east": 163.264, "geometry": ["POINT(163.1585 -77.6105)"], "keywords": "Antarctica; Cryosphere; Dry Valleys; Lake Fryxell; Paleoclimate; Radiocarbon; Ross Ice Sheet; Ross Sea; Stable Isotopes; U", "locations": "Lake Fryxell; Ross Sea; Ross Ice Sheet; Dry Valleys; Antarctica", "north": -77.599, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Hall, Brenda; Whittaker, Thomas", "project_titles": "Collaborative Research: Millennial-scale fluctuations of Dry Valleys lakes: Implications for regional climate variability and the interhemispheric (a)synchrony of climate change", "projects": [{"proj_uid": "p0010519", "repository": "USAP-DC", "title": "Collaborative Research: Millennial-scale fluctuations of Dry Valleys lakes: Implications for regional climate variability and the interhemispheric (a)synchrony of climate change"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.622, "title": "Lake Fryxell Sediment Core Data", "uid": "601955", "west": 163.053}, {"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": "Antarctica; Ross Ice Sheet; Liv Glacier; Transantarctic Mountains", "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}]
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| Dataset Title/Abstract/Map | NSF Award(s) | Date Created | PIs / Scientists | Project Links | Abstract | Bounds Geometry | Geometry | Selected | Visible |
|---|---|---|---|---|---|---|---|---|---|
|
Lake Fryxell Sediment Core Data
|
0124014 |
2025-07-09 | Hall, Brenda; Whittaker, Thomas |
Collaborative Research: Millennial-scale fluctuations of Dry Valleys lakes: Implications for regional climate variability and the interhemispheric (a)synchrony of climate change |
Physical and chemical properties of sediment cores from Lake Fryxell, Antarctica, provide a means of reconstructing past paleoenvironmental, water-level, and water-source changes over the last 60,000 years. This dataset includes stable isotope (O, C), radiocarbon, U-series, sedimentological, and loss-on-ignition data. The oxygen data relate primarily to water-source changes in the lake basin. Carbon (both stable and radioactive) isotopes are influenced heavily by lake stratification and depth of the photic zone. The data record surface level changes of Lake Fryxell over the past 60,000 years. In addition, the dated sediments constrain the Ross Sea ice sheet to east of (seaward of) the lake through that entire time. Finally, stable oxygen isotopes document water source changes switching from local alpine glacier meltwater to Ross Sea ice sheet meltwater and then back to local glacier meltwater. | ["POLYGON((163.053 -77.599,163.0741 -77.599,163.0952 -77.599,163.1163 -77.599,163.1374 -77.599,163.1585 -77.599,163.1796 -77.599,163.2007 -77.599,163.2218 -77.599,163.24290000000002 -77.599,163.264 -77.599,163.264 -77.60130000000001,163.264 -77.6036,163.264 -77.6059,163.264 -77.6082,163.264 -77.6105,163.264 -77.61280000000001,163.264 -77.6151,163.264 -77.6174,163.264 -77.6197,163.264 -77.622,163.24290000000002 -77.622,163.2218 -77.622,163.2007 -77.622,163.1796 -77.622,163.1585 -77.622,163.1374 -77.622,163.1163 -77.622,163.0952 -77.622,163.0741 -77.622,163.053 -77.622,163.053 -77.6197,163.053 -77.6174,163.053 -77.6151,163.053 -77.61280000000001,163.053 -77.6105,163.053 -77.6082,163.053 -77.6059,163.053 -77.6036,163.053 -77.60130000000001,163.053 -77.599))"] | ["POINT(163.1585 -77.6105)"] | false | false |
|
Cosmogenic nuclide data from glacial deposits along the Liv Glacier coast
|
1443346 |
2019-11-21 | Stone, John |
Collaborative Research: High-resolution Reconstruction of Holocene Deglaciation in the Southern Ross Embayment |
This data set contains measurements of cosmic-ray-produced Be-10 in quartz from glacial erratics and bedrock at sites along and adjacent to Liv Glacier and Amundsen Glacier in the southern Transantarctic Mountains. Samples were collected during the 2016-17 and 2017-18 field seasons working from remote camps along the coast. Locations were determined by hand-held GPS. Elevations are based on barometric altimetry corrected for daily drift and referenced to precise (geodetic) GPS benchmarks established over a range of altitudes at each site. Horizon geometry and the resulting topographic shielding of the cosmic ray flux was determined from vertically-oriented full-sky (fisheye) photographs at each sample location. Samples were processed at the University of Washington Cosmogenic Nuclide Laboratory using established procedures for mineral separation, dissolution, beryllium extraction and purification, described at http://depts.washington.edu/cosmolab/chem.shtml. Beryllium isotope ratios were measured at the Lawrence Livermore Center for Accelerator Mass Spectrometry (LLNL-CAMS) relative to the KNSTD-Be-01-5-4 standard, assuming a standard Be-10/Be-9 ratio of 2.851E-12 (07KNSTD normalization). Data are reported as input for the online CRONUS cosmogenic nuclide calculator (V3, current at the time of submission in November 2019). Exposure ages can be obtained by entering the data into the CRONUS calculator, at: http://hess.ess.washington.edu/math/v3/v3_age_in.html . Data for each sample consists of two lines of input parameters, as follows: {Sample_name, Latitude (DD), Longitude (DD), Altitude (m asl), Scaling_function, Thickness (cm), Density (g/cm^3), Horizon_correction, Erosion_rate (cm/yr), Year_sampled} {Sample_name, Nuclide (in this case Be-10), Target_mineral (quartz), Be-10_concentration (atom/g), Error_Be-10_concentration (atom/g), Normalization} Further information about the V3 input format is given at: http://hess.ess.washington.edu/math/docs/v3/v3_input_explained.html | ["POLYGON((-174 -84.5,-172.4 -84.5,-170.8 -84.5,-169.2 -84.5,-167.6 -84.5,-166 -84.5,-164.4 -84.5,-162.8 -84.5,-161.2 -84.5,-159.6 -84.5,-158 -84.5,-158 -84.63,-158 -84.76,-158 -84.89,-158 -85.02,-158 -85.15,-158 -85.28,-158 -85.41,-158 -85.54,-158 -85.67,-158 -85.8,-159.6 -85.8,-161.2 -85.8,-162.8 -85.8,-164.4 -85.8,-166 -85.8,-167.6 -85.8,-169.2 -85.8,-170.8 -85.8,-172.4 -85.8,-174 -85.8,-174 -85.67,-174 -85.54,-174 -85.41,-174 -85.28,-174 -85.15,-174 -85.02,-174 -84.89,-174 -84.76,-174 -84.63,-174 -84.5))"] | ["POINT(-166 -85.15)"] | false | false |
