Reversible ice sheet thinning in the Amundsen Sea Embayment during the Late Holocene
Cosmogenic-nuclide concentrations in subglacial bedrock cores show that the West Antarctic Ice Sheet (WAIS) at a site between Thwaites and Pope Glaciers was at least 35 m thinner than present in the past several thousand years, and subsequently thickened. This is important because of concern that pr...
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ftcopernicus:oai:publications.copernicus.org:tcd106062 2023-05-15T13:23:43+02:00 Reversible ice sheet thinning in the Amundsen Sea Embayment during the Late Holocene Balco, Greg Brown, Nathan Nichols, Keir Venturelli, Ryan A. Adams, Jonathan Braddock, Scott Campbell, Seth Goehring, Brent Johnson, Joanne S. Rood, Dylan H. Wilcken, Klaus Hall, Brenda Woodward, John 2022-09-14 application/pdf https://doi.org/10.5194/tc-2022-172 https://tc.copernicus.org/preprints/tc-2022-172/ eng eng doi:10.5194/tc-2022-172 https://tc.copernicus.org/preprints/tc-2022-172/ eISSN: 1994-0424 Text 2022 ftcopernicus https://doi.org/10.5194/tc-2022-172 2022-09-19T16:22:55Z Cosmogenic-nuclide concentrations in subglacial bedrock cores show that the West Antarctic Ice Sheet (WAIS) at a site between Thwaites and Pope Glaciers was at least 35 m thinner than present in the past several thousand years, and subsequently thickened. This is important because of concern that present thinning and grounding line retreat at these and nearby glaciers in the Amundsen Sea Embayment may be irreversible, potentially leading to decimeter- to meter-scale sea level rise within decades to centuries. A past episode of ice sheet thinning, which took place in a similar although not identical climate, was not irreversible. We propose that the past thinning-thickening cycle was due to a glacioisostatic rebound feedback, similar to that invoked as a possible stabilizing mechanism for current grounding line retreat, in which isostatic uplift caused by early Holocene thinning led to relative sea level fall favoring grounding line advance. Text Amundsen Sea Antarc* Antarctic Ice Sheet Copernicus Publications: E-Journals Amundsen Sea Antarctic West Antarctic Ice Sheet |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Cosmogenic-nuclide concentrations in subglacial bedrock cores show that the West Antarctic Ice Sheet (WAIS) at a site between Thwaites and Pope Glaciers was at least 35 m thinner than present in the past several thousand years, and subsequently thickened. This is important because of concern that present thinning and grounding line retreat at these and nearby glaciers in the Amundsen Sea Embayment may be irreversible, potentially leading to decimeter- to meter-scale sea level rise within decades to centuries. A past episode of ice sheet thinning, which took place in a similar although not identical climate, was not irreversible. We propose that the past thinning-thickening cycle was due to a glacioisostatic rebound feedback, similar to that invoked as a possible stabilizing mechanism for current grounding line retreat, in which isostatic uplift caused by early Holocene thinning led to relative sea level fall favoring grounding line advance. |
format |
Text |
author |
Balco, Greg Brown, Nathan Nichols, Keir Venturelli, Ryan A. Adams, Jonathan Braddock, Scott Campbell, Seth Goehring, Brent Johnson, Joanne S. Rood, Dylan H. Wilcken, Klaus Hall, Brenda Woodward, John |
spellingShingle |
Balco, Greg Brown, Nathan Nichols, Keir Venturelli, Ryan A. Adams, Jonathan Braddock, Scott Campbell, Seth Goehring, Brent Johnson, Joanne S. Rood, Dylan H. Wilcken, Klaus Hall, Brenda Woodward, John Reversible ice sheet thinning in the Amundsen Sea Embayment during the Late Holocene |
author_facet |
Balco, Greg Brown, Nathan Nichols, Keir Venturelli, Ryan A. Adams, Jonathan Braddock, Scott Campbell, Seth Goehring, Brent Johnson, Joanne S. Rood, Dylan H. Wilcken, Klaus Hall, Brenda Woodward, John |
author_sort |
Balco, Greg |
title |
Reversible ice sheet thinning in the Amundsen Sea Embayment during the Late Holocene |
title_short |
Reversible ice sheet thinning in the Amundsen Sea Embayment during the Late Holocene |
title_full |
Reversible ice sheet thinning in the Amundsen Sea Embayment during the Late Holocene |
title_fullStr |
Reversible ice sheet thinning in the Amundsen Sea Embayment during the Late Holocene |
title_full_unstemmed |
Reversible ice sheet thinning in the Amundsen Sea Embayment during the Late Holocene |
title_sort |
reversible ice sheet thinning in the amundsen sea embayment during the late holocene |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-2022-172 https://tc.copernicus.org/preprints/tc-2022-172/ |
geographic |
Amundsen Sea Antarctic West Antarctic Ice Sheet |
geographic_facet |
Amundsen Sea Antarctic West Antarctic Ice Sheet |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2022-172 https://tc.copernicus.org/preprints/tc-2022-172/ |
op_doi |
https://doi.org/10.5194/tc-2022-172 |
_version_ |
1766374363494350848 |