Glacial History of the Amundsen Sea Shelf
This award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports a marine geological investigation of the Amundsen Sea region toward a better understanding of the deglaciation history of the West Antarctic Ice Sheet (WAIS). The WAIS may be inherently uns...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:orsp_reports-1108 2023-05-15T13:23:27+02:00 Glacial History of the Amundsen Sea Shelf Kellogg, Thomas B. Belknap, Daniel Kellogg, Davida Hughes, Terence 2005-07-28T07:00:00Z application/pdf https://digitalcommons.library.umaine.edu/orsp_reports/98 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1108&context=orsp_reports unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/orsp_reports/98 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1108&context=orsp_reports This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). University of Maine Office of Research Administration: Grant Reports Climate Change Climatology Sediment Sampling Climate Environmental Studies Glaciology text 2005 ftmaineuniv 2023-03-12T19:15:10Z This award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports a marine geological investigation of the Amundsen Sea region toward a better understanding of the deglaciation history of the West Antarctic Ice Sheet (WAIS). The WAIS may be inherently unstable because it is the last marine-based ice sheet in the world. Unlike other embayments in West Antarctica, major ice streams draining into the Amundsen Sea from the interior of the WAIS lack buttressing ice shelves. Mass balance data for the distal portions of these ice streams (Pine Island and Thwaites glaciers) appear to be in balance or may be becoming negative. Because both ice streams have beds that slope downward toward the center of the ice sheet, grounding-line recession resulting from either continued thinning or sea-level rise could trigger irreversible grounding-line retreat, leading to ice-sheet disintegration and consequent global sea-level rise. The limited marine geological and geophysical data available from the Amundsen Sea suggest that grounded ice or an ice shelf occupied the inner Amundsen Sea embayment until perhaps as recently as 1000 to 2000 years ago, and this ice may have retreated rapidly in historic time.This project, a study of the marine geology and geophysics of the Amundsen Sea continental shelf from 100 degrees W to 130 degrees W, is designed to address the Amundsen Sea part of WAIS Science Plan Priority Goal H2: "What is the deglaciation history in the eastern Ross, the Bellingshausen and Amundsen Seas?" This project will examine bathymetric data of the Amundsen Sea continental shelf to determine the positions of former ice-steam channels, and to aid in choosing sites for sediment coring. Single-channel seismic reflection studies will be conducted in order to determine sediment-thickness patterns, to aid in choice of coring sites, and to locate and identify morphologic features indicative of former grounded ice (e.g., moraines, scours, flutes, striations, till wedges and deltas, ... Text Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Pine Island West Antarctica The University of Maine: DigitalCommons@UMaine Antarctic The Antarctic West Antarctica Amundsen Sea West Antarctic Ice Sheet |
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Open Polar |
collection |
The University of Maine: DigitalCommons@UMaine |
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ftmaineuniv |
language |
unknown |
topic |
Climate Change Climatology Sediment Sampling Climate Environmental Studies Glaciology |
spellingShingle |
Climate Change Climatology Sediment Sampling Climate Environmental Studies Glaciology Kellogg, Thomas B. Belknap, Daniel Kellogg, Davida Hughes, Terence Glacial History of the Amundsen Sea Shelf |
topic_facet |
Climate Change Climatology Sediment Sampling Climate Environmental Studies Glaciology |
description |
This award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports a marine geological investigation of the Amundsen Sea region toward a better understanding of the deglaciation history of the West Antarctic Ice Sheet (WAIS). The WAIS may be inherently unstable because it is the last marine-based ice sheet in the world. Unlike other embayments in West Antarctica, major ice streams draining into the Amundsen Sea from the interior of the WAIS lack buttressing ice shelves. Mass balance data for the distal portions of these ice streams (Pine Island and Thwaites glaciers) appear to be in balance or may be becoming negative. Because both ice streams have beds that slope downward toward the center of the ice sheet, grounding-line recession resulting from either continued thinning or sea-level rise could trigger irreversible grounding-line retreat, leading to ice-sheet disintegration and consequent global sea-level rise. The limited marine geological and geophysical data available from the Amundsen Sea suggest that grounded ice or an ice shelf occupied the inner Amundsen Sea embayment until perhaps as recently as 1000 to 2000 years ago, and this ice may have retreated rapidly in historic time.This project, a study of the marine geology and geophysics of the Amundsen Sea continental shelf from 100 degrees W to 130 degrees W, is designed to address the Amundsen Sea part of WAIS Science Plan Priority Goal H2: "What is the deglaciation history in the eastern Ross, the Bellingshausen and Amundsen Seas?" This project will examine bathymetric data of the Amundsen Sea continental shelf to determine the positions of former ice-steam channels, and to aid in choosing sites for sediment coring. Single-channel seismic reflection studies will be conducted in order to determine sediment-thickness patterns, to aid in choice of coring sites, and to locate and identify morphologic features indicative of former grounded ice (e.g., moraines, scours, flutes, striations, till wedges and deltas, ... |
format |
Text |
author |
Kellogg, Thomas B. Belknap, Daniel Kellogg, Davida Hughes, Terence |
author_facet |
Kellogg, Thomas B. Belknap, Daniel Kellogg, Davida Hughes, Terence |
author_sort |
Kellogg, Thomas B. |
title |
Glacial History of the Amundsen Sea Shelf |
title_short |
Glacial History of the Amundsen Sea Shelf |
title_full |
Glacial History of the Amundsen Sea Shelf |
title_fullStr |
Glacial History of the Amundsen Sea Shelf |
title_full_unstemmed |
Glacial History of the Amundsen Sea Shelf |
title_sort |
glacial history of the amundsen sea shelf |
publisher |
DigitalCommons@UMaine |
publishDate |
2005 |
url |
https://digitalcommons.library.umaine.edu/orsp_reports/98 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1108&context=orsp_reports |
geographic |
Antarctic The Antarctic West Antarctica Amundsen Sea West Antarctic Ice Sheet |
geographic_facet |
Antarctic The Antarctic West Antarctica Amundsen Sea West Antarctic Ice Sheet |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Pine Island West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Pine Island West Antarctica |
op_source |
University of Maine Office of Research Administration: Grant Reports |
op_relation |
https://digitalcommons.library.umaine.edu/orsp_reports/98 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1108&context=orsp_reports |
op_rights |
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). |
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