The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea

Abstract 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...

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Autores principales:	Philip J. Bart, Benjamin J. Krogmeier, Manon P. Bart, Slawek Tulaczyk
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a7a5e8556c354bb6be21cea377422cdf
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spelling	oai:doaj.org-article:a7a5e8556c354bb6be21cea377422cdf2021-12-02T11:52:32ZThe paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea10.1038/s41598-017-01329-82045-2322https://doaj.org/article/a7a5e8556c354bb6be21cea377422cdf2017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01329-8https://doaj.org/toc/2045-2322Abstract 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.Philip J. BartBenjamin J. KrogmeierManon P. BartSlawek TulaczykNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Philip J. Bart Benjamin J. Krogmeier Manon P. Bart Slawek Tulaczyk The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea
description	Abstract 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	article
author	Philip J. Bart Benjamin J. Krogmeier Manon P. Bart Slawek Tulaczyk
author_facet	Philip J. Bart Benjamin J. Krogmeier Manon P. Bart Slawek Tulaczyk
author_sort	Philip J. Bart
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 Portfolio
publishDate	2017
url	https://doaj.org/article/a7a5e8556c354bb6be21cea377422cdf
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The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea

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