Major ice‐sheet change in the Weddell Sector of West Antarctica over the last 5000 years.
Until recently, little was known about the Weddell Sea sector of the West Antarctic Ice Sheet. In the last 10 years, a variety of expeditions and numerical modelling experiments have improved knowledge of its glaciology, glacial geology, and tectonic setting. Two of the sector's largest ice str...
Published in: | Reviews of Geophysics |
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John Wiley
2019
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Online Access: | http://dro.dur.ac.uk/29277/ http://dro.dur.ac.uk/29277/1/29277.pdf http://dro.dur.ac.uk/29277/2/29277.pdf http://dro.dur.ac.uk/29277/3/29277.pdf https://doi.org/10.1029/2019RG000651 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:29277 2023-05-15T13:48:01+02:00 Major ice‐sheet change in the Weddell Sector of West Antarctica over the last 5000 years. Siegert, Martin J. Kingslake, Jonny Ross, Neil Whitehouse, Pippa L. Woodward, John Jamieson, Stewart S.R. Bentley, Michael J. Winter, Kate Wearing, Martin Hein, Andrew S. Jeofry, Hafeez Sugden, David E. 2019-12-31 application/pdf http://dro.dur.ac.uk/29277/ http://dro.dur.ac.uk/29277/1/29277.pdf http://dro.dur.ac.uk/29277/2/29277.pdf http://dro.dur.ac.uk/29277/3/29277.pdf https://doi.org/10.1029/2019RG000651 unknown John Wiley dro:29277 issn:8755-1209 issn: 1944-9208 doi:10.1029/2019RG000651 http://dro.dur.ac.uk/29277/ https://doi.org/10.1029/2019RG000651 http://dro.dur.ac.uk/29277/1/29277.pdf http://dro.dur.ac.uk/29277/2/29277.pdf http://dro.dur.ac.uk/29277/3/29277.pdf © 2019. 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 Reviews of geophysics, 2019, Vol.57(4), pp.1197-1223 [Peer Reviewed Journal] Article PeerReviewed 2019 ftunivdurham https://doi.org/10.1029/2019RG000651 2020-06-11T22:25:19Z Until recently, little was known about the Weddell Sea sector of the West Antarctic Ice Sheet. In the last 10 years, a variety of expeditions and numerical modelling experiments have improved knowledge of its glaciology, glacial geology, and tectonic setting. Two of the sector's largest ice streams rest on a steep reverse‐sloping bed yet, despite being vulnerable to change, satellite observations show contemporary stability. There is clear evidence for major ice‐sheet reconfiguration in the last few thousand years, however. Knowing precisely how the ice sheet has changed in the past, and when, would allow us to better understand whether it is now at risk. Two competing hypotheses have been established for this glacial history. In one, the ice sheet retreated and thinned progressively from its Last Glacial Maximum position. Retreat stopped at, or very near, the present position in the Late Holocene. Alternatively, in the Late Holocene the ice sheet retreated significantly upstream of the present grounding line, and then advanced to the present location due to glacial isostatic adjustment, and ice‐shelf and ice rise buttressing. Both hypotheses point to data and theory in their support, yet neither has been unequivocally tested or falsified. Here, we review geophysical evidence to determine how each hypothesis has been formed, where there are inconsistencies in the respective glacial histories, how they may be tested or reconciled, and what new evidence is required to reach a common model for the Late Holocene ice sheet history of the Weddell Sea sector of West Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Weddell Sea West Antarctica Durham University: Durham Research Online Antarctic Weddell Weddell Sea West Antarctic Ice Sheet West Antarctica Reviews of Geophysics 57 4 1197 1223 |
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Open Polar |
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Durham University: Durham Research Online |
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ftunivdurham |
language |
unknown |
description |
Until recently, little was known about the Weddell Sea sector of the West Antarctic Ice Sheet. In the last 10 years, a variety of expeditions and numerical modelling experiments have improved knowledge of its glaciology, glacial geology, and tectonic setting. Two of the sector's largest ice streams rest on a steep reverse‐sloping bed yet, despite being vulnerable to change, satellite observations show contemporary stability. There is clear evidence for major ice‐sheet reconfiguration in the last few thousand years, however. Knowing precisely how the ice sheet has changed in the past, and when, would allow us to better understand whether it is now at risk. Two competing hypotheses have been established for this glacial history. In one, the ice sheet retreated and thinned progressively from its Last Glacial Maximum position. Retreat stopped at, or very near, the present position in the Late Holocene. Alternatively, in the Late Holocene the ice sheet retreated significantly upstream of the present grounding line, and then advanced to the present location due to glacial isostatic adjustment, and ice‐shelf and ice rise buttressing. Both hypotheses point to data and theory in their support, yet neither has been unequivocally tested or falsified. Here, we review geophysical evidence to determine how each hypothesis has been formed, where there are inconsistencies in the respective glacial histories, how they may be tested or reconciled, and what new evidence is required to reach a common model for the Late Holocene ice sheet history of the Weddell Sea sector of West Antarctica. |
format |
Article in Journal/Newspaper |
author |
Siegert, Martin J. Kingslake, Jonny Ross, Neil Whitehouse, Pippa L. Woodward, John Jamieson, Stewart S.R. Bentley, Michael J. Winter, Kate Wearing, Martin Hein, Andrew S. Jeofry, Hafeez Sugden, David E. |
spellingShingle |
Siegert, Martin J. Kingslake, Jonny Ross, Neil Whitehouse, Pippa L. Woodward, John Jamieson, Stewart S.R. Bentley, Michael J. Winter, Kate Wearing, Martin Hein, Andrew S. Jeofry, Hafeez Sugden, David E. Major ice‐sheet change in the Weddell Sector of West Antarctica over the last 5000 years. |
author_facet |
Siegert, Martin J. Kingslake, Jonny Ross, Neil Whitehouse, Pippa L. Woodward, John Jamieson, Stewart S.R. Bentley, Michael J. Winter, Kate Wearing, Martin Hein, Andrew S. Jeofry, Hafeez Sugden, David E. |
author_sort |
Siegert, Martin J. |
title |
Major ice‐sheet change in the Weddell Sector of West Antarctica over the last 5000 years. |
title_short |
Major ice‐sheet change in the Weddell Sector of West Antarctica over the last 5000 years. |
title_full |
Major ice‐sheet change in the Weddell Sector of West Antarctica over the last 5000 years. |
title_fullStr |
Major ice‐sheet change in the Weddell Sector of West Antarctica over the last 5000 years. |
title_full_unstemmed |
Major ice‐sheet change in the Weddell Sector of West Antarctica over the last 5000 years. |
title_sort |
major ice‐sheet change in the weddell sector of west antarctica over the last 5000 years. |
publisher |
John Wiley |
publishDate |
2019 |
url |
http://dro.dur.ac.uk/29277/ http://dro.dur.ac.uk/29277/1/29277.pdf http://dro.dur.ac.uk/29277/2/29277.pdf http://dro.dur.ac.uk/29277/3/29277.pdf https://doi.org/10.1029/2019RG000651 |
geographic |
Antarctic Weddell Weddell Sea West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Antarctic Weddell Weddell Sea West Antarctic Ice Sheet West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Weddell Sea West Antarctica |
op_source |
Reviews of geophysics, 2019, Vol.57(4), pp.1197-1223 [Peer Reviewed Journal] |
op_relation |
dro:29277 issn:8755-1209 issn: 1944-9208 doi:10.1029/2019RG000651 http://dro.dur.ac.uk/29277/ https://doi.org/10.1029/2019RG000651 http://dro.dur.ac.uk/29277/1/29277.pdf http://dro.dur.ac.uk/29277/2/29277.pdf http://dro.dur.ac.uk/29277/3/29277.pdf |
op_rights |
© 2019. 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/10.1029/2019RG000651 |
container_title |
Reviews of Geophysics |
container_volume |
57 |
container_issue |
4 |
container_start_page |
1197 |
op_container_end_page |
1223 |
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1766248425394798592 |