Long-term increase in Antarctic Ice Sheet vulnerability driven by bed topography evolution.
Ice sheet behavior is strongly influenced by the bed topography. However, the effect of the progressive temporal evolution of Antarctica's subglacial landscape on the sensitivity of the Antarctic Ice Sheet (AIS) to climatic and oceanic change has yet to be fully quantified. Here we investigate...
Published in: | Geophysical Research Letters |
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Online Access: | http://dro.dur.ac.uk/31990/ http://dro.dur.ac.uk/31990/1/31990.pdf https://doi.org/10.1029/2020GL090003 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:31990 2023-05-15T13:37:59+02:00 Long-term increase in Antarctic Ice Sheet vulnerability driven by bed topography evolution. Paxman, G.J.G. Gasson, E.G.W. Jamieson, S.S.R. Bentley, M.J. Ferraccioli, F. 2020-10 application/pdf http://dro.dur.ac.uk/31990/ http://dro.dur.ac.uk/31990/1/31990.pdf https://doi.org/10.1029/2020GL090003 unknown John Wiley dro:31990 issn:1944-8007 doi:10.1029/2020GL090003 http://dro.dur.ac.uk/31990/ https://doi.org/10.1029/2020GL090003 http://dro.dur.ac.uk/31990/1/31990.pdf ©2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Geophysical research letters, 2020, Vol.47(20), pp.e2020GL090003 [Peer Reviewed Journal] Article PeerReviewed 2020 ftunivdurham https://doi.org/10.1029/2020GL090003 2020-10-29T23:22:27Z Ice sheet behavior is strongly influenced by the bed topography. However, the effect of the progressive temporal evolution of Antarctica's subglacial landscape on the sensitivity of the Antarctic Ice Sheet (AIS) to climatic and oceanic change has yet to be fully quantified. Here we investigate the evolving sensitivity of the AIS using a series of data‐constrained reconstructions of Antarctic paleotopography since glacial inception at the Eocene‐Oligocene transition. We use a numerical ice sheet model to subject the AIS to schematic climate and ocean warming experiments and find that bed topographic evolution causes a doubling in ice volume loss and equivalent global sea level rise. Glacial erosion is primarily responsible for enhanced ice sheet retreat via the development of increasingly low‐lying and reverse sloping beds over time, particularly within near‐coastal subglacial basins. We conclude that AIS sensitivity to climate and ocean forcing has been substantially amplified by long‐term landscape evolution. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Durham University: Durham Research Online Antarctic The Antarctic Geophysical Research Letters 47 20 |
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Open Polar |
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Durham University: Durham Research Online |
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ftunivdurham |
language |
unknown |
description |
Ice sheet behavior is strongly influenced by the bed topography. However, the effect of the progressive temporal evolution of Antarctica's subglacial landscape on the sensitivity of the Antarctic Ice Sheet (AIS) to climatic and oceanic change has yet to be fully quantified. Here we investigate the evolving sensitivity of the AIS using a series of data‐constrained reconstructions of Antarctic paleotopography since glacial inception at the Eocene‐Oligocene transition. We use a numerical ice sheet model to subject the AIS to schematic climate and ocean warming experiments and find that bed topographic evolution causes a doubling in ice volume loss and equivalent global sea level rise. Glacial erosion is primarily responsible for enhanced ice sheet retreat via the development of increasingly low‐lying and reverse sloping beds over time, particularly within near‐coastal subglacial basins. We conclude that AIS sensitivity to climate and ocean forcing has been substantially amplified by long‐term landscape evolution. |
format |
Article in Journal/Newspaper |
author |
Paxman, G.J.G. Gasson, E.G.W. Jamieson, S.S.R. Bentley, M.J. Ferraccioli, F. |
spellingShingle |
Paxman, G.J.G. Gasson, E.G.W. Jamieson, S.S.R. Bentley, M.J. Ferraccioli, F. Long-term increase in Antarctic Ice Sheet vulnerability driven by bed topography evolution. |
author_facet |
Paxman, G.J.G. Gasson, E.G.W. Jamieson, S.S.R. Bentley, M.J. Ferraccioli, F. |
author_sort |
Paxman, G.J.G. |
title |
Long-term increase in Antarctic Ice Sheet vulnerability driven by bed topography evolution. |
title_short |
Long-term increase in Antarctic Ice Sheet vulnerability driven by bed topography evolution. |
title_full |
Long-term increase in Antarctic Ice Sheet vulnerability driven by bed topography evolution. |
title_fullStr |
Long-term increase in Antarctic Ice Sheet vulnerability driven by bed topography evolution. |
title_full_unstemmed |
Long-term increase in Antarctic Ice Sheet vulnerability driven by bed topography evolution. |
title_sort |
long-term increase in antarctic ice sheet vulnerability driven by bed topography evolution. |
publisher |
John Wiley |
publishDate |
2020 |
url |
http://dro.dur.ac.uk/31990/ http://dro.dur.ac.uk/31990/1/31990.pdf https://doi.org/10.1029/2020GL090003 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Geophysical research letters, 2020, Vol.47(20), pp.e2020GL090003 [Peer Reviewed Journal] |
op_relation |
dro:31990 issn:1944-8007 doi:10.1029/2020GL090003 http://dro.dur.ac.uk/31990/ https://doi.org/10.1029/2020GL090003 http://dro.dur.ac.uk/31990/1/31990.pdf |
op_rights |
©2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2020GL090003 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
20 |
_version_ |
1766100272238559232 |