The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea
Marine geological data show that the West Antarctic Ice Sheet (WAIS) advanced to the eastern Ross Sea shelf edge during the Last Glacial Maximum (LGM) and eventually retreated ~1000 km to the current grounding-line position on the inner shelf. During the early deglacial, the WAIS deposited a volumin...
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ftpubmed:oai:pubmedcentral.nih.gov:5430838 2023-05-15T14:01:20+02:00 The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea Bart, Philip J. Krogmeier, Benjamin J. Bart, Manon P. Tulaczyk, Slawek 2017-04-28 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5430838/ http://www.ncbi.nlm.nih.gov/pubmed/28455508 https://doi.org/10.1038/s41598-017-01329-8 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5430838/ http://www.ncbi.nlm.nih.gov/pubmed/28455508 http://dx.doi.org/10.1038/s41598-017-01329-8 © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Article Text 2017 ftpubmed https://doi.org/10.1038/s41598-017-01329-8 2017-05-21T00:22:38Z Marine geological data show that the West Antarctic Ice Sheet (WAIS) advanced to the eastern Ross Sea shelf edge during the Last Glacial Maximum (LGM) and eventually retreated ~1000 km to the current grounding-line position on the inner shelf. During the early deglacial, the WAIS deposited a voluminous stack of overlapping grounding zone wedges (GZWs) on the outer shelf of the Whales Deep Basin. The large sediment volume of the GZW cluster suggests that the grounding-line position of the paleo-Bindschadler Ice Stream was relatively stationary for a significant time interval. We used an upper bound estimate of paleo-sediment flux to investigate the lower bound duration over which the ice stream would have deposited sediment to account for the GZW volume. Our calculations show that the cluster represents more than three millennia of ice-stream sedimentation. This long duration grounding was probably facilitated by rapid GZW growth. The subsequent punctuated large-distance (~200 km) grounding-line retreat may have been a highly non-linear ice sheet response to relatively continuous external forcing such as gradual climate warming or sea-level rise. These findings indicate that reliable predictions of future WAIS retreat may require incorporation of realistic calculations of sediment erosion, transport and deposition. Text Antarc* Antarctic Bindschadler Ice Stream Ice Sheet Ross Sea PubMed Central (PMC) Antarctic Bindschadler Ice Stream ENVELOPE(-142.000,-142.000,-81.000,-81.000) Ross Sea West Antarctic Ice Sheet Scientific Reports 7 1 |
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Article Bart, Philip J. Krogmeier, Benjamin J. Bart, Manon P. Tulaczyk, Slawek The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea |
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description |
Marine geological data show that the West Antarctic Ice Sheet (WAIS) advanced to the eastern Ross Sea shelf edge during the Last Glacial Maximum (LGM) and eventually retreated ~1000 km to the current grounding-line position on the inner shelf. During the early deglacial, the WAIS deposited a voluminous stack of overlapping grounding zone wedges (GZWs) on the outer shelf of the Whales Deep Basin. The large sediment volume of the GZW cluster suggests that the grounding-line position of the paleo-Bindschadler Ice Stream was relatively stationary for a significant time interval. We used an upper bound estimate of paleo-sediment flux to investigate the lower bound duration over which the ice stream would have deposited sediment to account for the GZW volume. Our calculations show that the cluster represents more than three millennia of ice-stream sedimentation. This long duration grounding was probably facilitated by rapid GZW growth. The subsequent punctuated large-distance (~200 km) grounding-line retreat may have been a highly non-linear ice sheet response to relatively continuous external forcing such as gradual climate warming or sea-level rise. These findings indicate that reliable predictions of future WAIS retreat may require incorporation of realistic calculations of sediment erosion, transport and deposition. |
format |
Text |
author |
Bart, Philip J. Krogmeier, Benjamin J. Bart, Manon P. Tulaczyk, Slawek |
author_facet |
Bart, Philip J. Krogmeier, Benjamin J. Bart, Manon P. Tulaczyk, Slawek |
author_sort |
Bart, Philip J. |
title |
The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea |
title_short |
The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea |
title_full |
The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea |
title_fullStr |
The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea |
title_full_unstemmed |
The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea |
title_sort |
paradox of a long grounding during west antarctic ice sheet retreat in ross sea |
publisher |
Nature Publishing Group UK |
publishDate |
2017 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5430838/ http://www.ncbi.nlm.nih.gov/pubmed/28455508 https://doi.org/10.1038/s41598-017-01329-8 |
long_lat |
ENVELOPE(-142.000,-142.000,-81.000,-81.000) |
geographic |
Antarctic Bindschadler Ice Stream Ross Sea West Antarctic Ice Sheet |
geographic_facet |
Antarctic Bindschadler Ice Stream Ross Sea West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Bindschadler Ice Stream Ice Sheet Ross Sea |
genre_facet |
Antarc* Antarctic Bindschadler Ice Stream Ice Sheet Ross Sea |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5430838/ http://www.ncbi.nlm.nih.gov/pubmed/28455508 http://dx.doi.org/10.1038/s41598-017-01329-8 |
op_rights |
© The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41598-017-01329-8 |
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