{"dp_type": "Dataset", "free_text": "Isochron"}
[{"awards": "1043761 Young, Duncan; 0230197 Holt, John; 0636724 Blankenship, Donald; 2127606 Young, Duncan A.", "bounds_geometry": ["POLYGON((-136 -74,-131.9 -74,-127.8 -74,-123.7 -74,-119.6 -74,-115.5 -74,-111.4 -74,-107.30000000000001 -74,-103.2 -74,-99.1 -74,-95 -74,-95 -74.7,-95 -75.4,-95 -76.1,-95 -76.8,-95 -77.5,-95 -78.2,-95 -78.9,-95 -79.6,-95 -80.3,-95 -81,-99.1 -81,-103.2 -81,-107.3 -81,-111.4 -81,-115.5 -81,-119.6 -81,-123.69999999999999 -81,-127.8 -81,-131.9 -81,-136 -81,-136 -80.3,-136 -79.6,-136 -78.9,-136 -78.2,-136 -77.5,-136 -76.8,-136 -76.1,-136 -75.4,-136 -74.7,-136 -74))"], "date_created": "Wed, 15 Mar 2023 00:00:00 GMT", "description": "This file contains internal radar horizon 1 (lm-MERGE-lay9-grg) for West Antarctica, collected during the SOAR/CASERTZ (1991-1996), SOAR/DVD (1999), ATRS (2001), AGASEA (2004-05) and GIMBLE (2013-2014) expeditions. Only data collected in AGASEA is contained in this specific product.\r\nThis data set is linked to PH.D thesis Muldoon, G. 2018 \"West Antarctic Ice Sheet Retreat during the Last Interglacial\"Spatial and temporal distributions of accumulation rates on the catchment of Thwaites Glacier, West Antarctica\", University of Texas at Austin\r\n https://doi.org/10.15781/T23B5WS0D\r\nThe internal radar horizon (IRH) was traced semi-automatically by Gail R. Muldoon using Haliburtons\u0027s Landmark software and picker, in a combination of 2D focused and unfocused data.\r\nDepths were calculated using a 2 way velocity in ice of 84.5 m/microsecond, and no firn correction. \r\n\r\nIsochron age is 4711 (+/- 246 ) years. \r\n\r\nFunding for this dataset as provided by NSF grants and The G. Unger Vetlesen Foundation.", "east": -95.0, "geometry": ["POINT(-115.5 -77.5)"], "keywords": "Antarchitecture; Antarctica; Ice Penetrating Radar; Isochron; Layers; Radar; Radioglaciology; Thwaites Glacier", "locations": "Thwaites Glacier; Antarctica", "north": -74.0, "nsf_funding_programs": "Antarctic Earth Sciences; Antarctic Glaciology; Antarctic Earth Sciences", "persons": "Muldoon, Gail R.; Young, Duncan A.; Jackson, Charles; Blankenship, Donald D.", "project_titles": "Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica (AGASEA); Collaborative Research: Synthesis of Thwaites Glacier Dynamics: Diagnostic and Prognostic Sensitivity Studies of a West Antarctic Outlet System; Geophysical Investigations of Marie Byrd Land Lithospheric Evolution (GIMBLE)", "projects": [{"proj_uid": "p0000174", "repository": "USAP-DC", "title": "Collaborative Research: Synthesis of Thwaites Glacier Dynamics: Diagnostic and Prognostic Sensitivity Studies of a West Antarctic Outlet System"}, {"proj_uid": "p0000435", "repository": "USAP-DC", "title": "Geophysical Investigations of Marie Byrd Land Lithospheric Evolution (GIMBLE)"}, {"proj_uid": "p0000243", "repository": "USAP-DC", "title": "Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica (AGASEA)"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -81.0, "title": "AGASEA 4.7 ka Englacial Isochron over the Thwaites Glacier Catchment", "uid": "601673", "west": -136.0}, {"awards": "0088035 Arcone, Steven; 0196441 Hamilton, Gordon; 0096299 Mayewski, Paul; 0229573 Mayewski, Paul", "bounds_geometry": ["POLYGON((-123.993 -77.6832,-123.6019 -77.6832,-123.2108 -77.6832,-122.8197 -77.6832,-122.4286 -77.6832,-122.0375 -77.6832,-121.6464 -77.6832,-121.2553 -77.6832,-120.8642 -77.6832,-120.4731 -77.6832,-120.082 -77.6832,-120.082 -77.7232,-120.082 -77.7632,-120.082 -77.8032,-120.082 -77.8432,-120.082 -77.8832,-120.082 -77.9232,-120.082 -77.9632,-120.082 -78.0032,-120.082 -78.0432,-120.082 -78.0832,-120.4731 -78.0832,-120.8642 -78.0832,-121.2553 -78.0832,-121.6464 -78.0832,-122.0375 -78.0832,-122.4286 -78.0832,-122.8197 -78.0832,-123.2108 -78.0832,-123.6019 -78.0832,-123.993 -78.0832,-123.993 -78.0432,-123.993 -78.0032,-123.993 -77.9632,-123.993 -77.9232,-123.993 -77.8832,-123.993 -77.8432,-123.993 -77.8032,-123.993 -77.7632,-123.993 -77.7232,-123.993 -77.6832))"], "date_created": "Wed, 06 Apr 2005 00:00:00 GMT", "description": "Snow accumulation rates typically show high variability over short distances. This data set contains accumulation rates derived from ground-penetrating radar (GPR) used to detect isochronal layers in the firn in West Antarctica. These layers were then dated using results from ice core analyses. These data show that accumulation rates along this profile have decreased in recent decades. The radar profile extends between two ice core sites taken along one of the US-ITASE traverse routes.", "east": -120.082, "geometry": ["POINT(-122.0375 -77.8832)"], "keywords": "Antarctica; Glaciers/ice Sheet; Glaciers/Ice Sheet; Glaciology; GPR; ITASE; WAIS", "locations": "WAIS; Antarctica", "north": -77.6832, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Spikes, Vandy Blue; Hamilton, Gordon S.; Mayewski, Paul A.; Arcone, Steven; Kaspari, Susan", "project_titles": "High Resolution Radar Profiling of the Snow and Ice Stratigraphy beneath the ITASE Traverses, West Antarctic Ice Sheet", "projects": [{"proj_uid": "p0000146", "repository": "USAP-DC", "title": "High Resolution Radar Profiling of the Snow and Ice Stratigraphy beneath the ITASE Traverses, West Antarctic Ice Sheet"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "ITASE", "south": -78.0832, "title": "US International Trans-Antarctic Scientific Expedition (US ITASE): GPR Profiles and Accumulation Mapping", "uid": "609269", "west": -123.993}]
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| Dataset Title/Abstract/Map | NSF Award(s) | Date Created | PIs / Scientists | Project Links | Abstract | Bounds Geometry | Geometry | Selected | Visible |
|---|---|---|---|---|---|---|---|---|---|
|
AGASEA 4.7 ka Englacial Isochron over the Thwaites Glacier Catchment
|
1043761 0230197 0636724 2127606 |
2023-03-15 | Muldoon, Gail R.; Young, Duncan A.; Jackson, Charles; Blankenship, Donald D. |
Collaborative Research: Synthesis of Thwaites Glacier Dynamics: Diagnostic and Prognostic Sensitivity Studies of a West Antarctic Outlet System Geophysical Investigations of Marie Byrd Land Lithospheric Evolution (GIMBLE) Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica (AGASEA) |
This file contains internal radar horizon 1 (lm-MERGE-lay9-grg) for West Antarctica, collected during the SOAR/CASERTZ (1991-1996), SOAR/DVD (1999), ATRS (2001), AGASEA (2004-05) and GIMBLE (2013-2014) expeditions. Only data collected in AGASEA is contained in this specific product. This data set is linked to PH.D thesis Muldoon, G. 2018 "West Antarctic Ice Sheet Retreat during the Last Interglacial"Spatial and temporal distributions of accumulation rates on the catchment of Thwaites Glacier, West Antarctica", University of Texas at Austin https://doi.org/10.15781/T23B5WS0D The internal radar horizon (IRH) was traced semi-automatically by Gail R. Muldoon using Haliburtons's Landmark software and picker, in a combination of 2D focused and unfocused data. Depths were calculated using a 2 way velocity in ice of 84.5 m/microsecond, and no firn correction. Isochron age is 4711 (+/- 246 ) years. Funding for this dataset as provided by NSF grants and The G. Unger Vetlesen Foundation. | ["POLYGON((-136 -74,-131.9 -74,-127.8 -74,-123.7 -74,-119.6 -74,-115.5 -74,-111.4 -74,-107.30000000000001 -74,-103.2 -74,-99.1 -74,-95 -74,-95 -74.7,-95 -75.4,-95 -76.1,-95 -76.8,-95 -77.5,-95 -78.2,-95 -78.9,-95 -79.6,-95 -80.3,-95 -81,-99.1 -81,-103.2 -81,-107.3 -81,-111.4 -81,-115.5 -81,-119.6 -81,-123.69999999999999 -81,-127.8 -81,-131.9 -81,-136 -81,-136 -80.3,-136 -79.6,-136 -78.9,-136 -78.2,-136 -77.5,-136 -76.8,-136 -76.1,-136 -75.4,-136 -74.7,-136 -74))"] | ["POINT(-115.5 -77.5)"] | false | false |
|
US International Trans-Antarctic Scientific Expedition (US ITASE): GPR Profiles and Accumulation Mapping
|
0088035 0196441 0096299 0229573 |
2005-04-06 | Spikes, Vandy Blue; Hamilton, Gordon S.; Mayewski, Paul A.; Arcone, Steven; Kaspari, Susan |
High Resolution Radar Profiling of the Snow and Ice Stratigraphy beneath the ITASE Traverses, West Antarctic Ice Sheet |
Snow accumulation rates typically show high variability over short distances. This data set contains accumulation rates derived from ground-penetrating radar (GPR) used to detect isochronal layers in the firn in West Antarctica. These layers were then dated using results from ice core analyses. These data show that accumulation rates along this profile have decreased in recent decades. The radar profile extends between two ice core sites taken along one of the US-ITASE traverse routes. | ["POLYGON((-123.993 -77.6832,-123.6019 -77.6832,-123.2108 -77.6832,-122.8197 -77.6832,-122.4286 -77.6832,-122.0375 -77.6832,-121.6464 -77.6832,-121.2553 -77.6832,-120.8642 -77.6832,-120.4731 -77.6832,-120.082 -77.6832,-120.082 -77.7232,-120.082 -77.7632,-120.082 -77.8032,-120.082 -77.8432,-120.082 -77.8832,-120.082 -77.9232,-120.082 -77.9632,-120.082 -78.0032,-120.082 -78.0432,-120.082 -78.0832,-120.4731 -78.0832,-120.8642 -78.0832,-121.2553 -78.0832,-121.6464 -78.0832,-122.0375 -78.0832,-122.4286 -78.0832,-122.8197 -78.0832,-123.2108 -78.0832,-123.6019 -78.0832,-123.993 -78.0832,-123.993 -78.0432,-123.993 -78.0032,-123.993 -77.9632,-123.993 -77.9232,-123.993 -77.8832,-123.993 -77.8432,-123.993 -77.8032,-123.993 -77.7632,-123.993 -77.7232,-123.993 -77.6832))"] | ["POINT(-122.0375 -77.8832)"] | false | false |
