Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica.
The Weddell Sea sector of the Antarctic Ice Sheet is hypothesized to have made a significant contribution to sea-level rise since the Last Glacial Maximum. Using a numerical flowline model we investigate the controls on grounding line motion across the eastern Weddell Sea and compare our results wit...
Published in: | Journal of Geophysical Research: Earth Surface |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Geophysical Union
2017
|
Subjects: | |
Online Access: | http://dro.dur.ac.uk/20826/ http://dro.dur.ac.uk/20826/1/20826.pdf http://dro.dur.ac.uk/20826/2/20826P.pdf https://doi.org/10.1002/2016JF004121 |
id |
ftunivdurham:oai:dro.dur.ac.uk.OAI2:20826 |
---|---|
record_format |
openpolar |
spelling |
ftunivdurham:oai:dro.dur.ac.uk.OAI2:20826 2023-05-15T14:02:14+02:00 Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica. Whitehouse, Pippa L. Bentley, Michael J. Vieli, Andreas Jamieson, Stewart S.R. Hein, Andrew S. Sugden, David E. 2017-01-25 application/pdf http://dro.dur.ac.uk/20826/ http://dro.dur.ac.uk/20826/1/20826.pdf http://dro.dur.ac.uk/20826/2/20826P.pdf https://doi.org/10.1002/2016JF004121 unknown American Geophysical Union dro:20826 issn:2169-9011 doi:10.1002/2016JF004121 http://dro.dur.ac.uk/20826/ https://doi.org/10.1002/2016JF004121 http://dro.dur.ac.uk/20826/1/20826.pdf http://dro.dur.ac.uk/20826/2/20826P.pdf © 2016. 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 Journal of geophysical research. Earth surface, 2017, Vol.122(1), pp.371-397 [Peer Reviewed Journal] Article PeerReviewed 2017 ftunivdurham https://doi.org/10.1002/2016JF004121 2020-05-28T22:36:34Z The Weddell Sea sector of the Antarctic Ice Sheet is hypothesized to have made a significant contribution to sea-level rise since the Last Glacial Maximum. Using a numerical flowline model we investigate the controls on grounding line motion across the eastern Weddell Sea and compare our results with field data relating to past ice extent. Specifically, we investigate the influence of changes in ice temperature, accumulation, sea level, ice shelf basal melt, and ice shelf buttressing on the dynamics of the Foundation Ice Stream. We find that ice shelf basal melt plays an important role in controlling grounding line advance, while a reduction in ice shelf buttressing is found to be necessary for grounding line retreat. There are two stable positions for the grounding line under glacial conditions: at the northern margin of Berkner Island and at the continental shelf break. Global mean sea-level contributions associated with these two scenarios are ~50 mm and ~130 mm, respectively. Comparing model results with field evidence from the Pensacola Mountains and the Shackleton Range, we find it unlikely that ice was grounded at the continental shelf break for a prolonged period during the last glacial cycle. However, we cannot rule out a brief advance to this position or a scenario in which the grounding line retreated behind present during deglaciation and has since re-advanced. Better constraints on past ice sheet and ice shelf geometry, ocean temperature, and ocean circulation are needed to reconstruct more robustly past behavior of the Foundation Ice Stream. Article in Journal/Newspaper Antarc* Antarctic Antarctica Berkner Island Foundation Ice Stream Ice Sheet Ice Shelf Weddell Sea Durham University: Durham Research Online Antarctic Berkner Island ENVELOPE(-48.117,-48.117,-79.333,-79.333) Foundation Ice Stream ENVELOPE(-60.000,-60.000,-83.250,-83.250) Pensacola Mountains ENVELOPE(-58.000,-58.000,-83.500,-83.500) Shackleton Shackleton Range ENVELOPE(-26.000,-26.000,-80.833,-80.833) The Antarctic Weddell Weddell Sea Journal of Geophysical Research: Earth Surface 122 1 371 397 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
The Weddell Sea sector of the Antarctic Ice Sheet is hypothesized to have made a significant contribution to sea-level rise since the Last Glacial Maximum. Using a numerical flowline model we investigate the controls on grounding line motion across the eastern Weddell Sea and compare our results with field data relating to past ice extent. Specifically, we investigate the influence of changes in ice temperature, accumulation, sea level, ice shelf basal melt, and ice shelf buttressing on the dynamics of the Foundation Ice Stream. We find that ice shelf basal melt plays an important role in controlling grounding line advance, while a reduction in ice shelf buttressing is found to be necessary for grounding line retreat. There are two stable positions for the grounding line under glacial conditions: at the northern margin of Berkner Island and at the continental shelf break. Global mean sea-level contributions associated with these two scenarios are ~50 mm and ~130 mm, respectively. Comparing model results with field evidence from the Pensacola Mountains and the Shackleton Range, we find it unlikely that ice was grounded at the continental shelf break for a prolonged period during the last glacial cycle. However, we cannot rule out a brief advance to this position or a scenario in which the grounding line retreated behind present during deglaciation and has since re-advanced. Better constraints on past ice sheet and ice shelf geometry, ocean temperature, and ocean circulation are needed to reconstruct more robustly past behavior of the Foundation Ice Stream. |
format |
Article in Journal/Newspaper |
author |
Whitehouse, Pippa L. Bentley, Michael J. Vieli, Andreas Jamieson, Stewart S.R. Hein, Andrew S. Sugden, David E. |
spellingShingle |
Whitehouse, Pippa L. Bentley, Michael J. Vieli, Andreas Jamieson, Stewart S.R. Hein, Andrew S. Sugden, David E. Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica. |
author_facet |
Whitehouse, Pippa L. Bentley, Michael J. Vieli, Andreas Jamieson, Stewart S.R. Hein, Andrew S. Sugden, David E. |
author_sort |
Whitehouse, Pippa L. |
title |
Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica. |
title_short |
Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica. |
title_full |
Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica. |
title_fullStr |
Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica. |
title_full_unstemmed |
Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica. |
title_sort |
controls on last glacial maximum ice extent in the weddell sea embayment, antarctica. |
publisher |
American Geophysical Union |
publishDate |
2017 |
url |
http://dro.dur.ac.uk/20826/ http://dro.dur.ac.uk/20826/1/20826.pdf http://dro.dur.ac.uk/20826/2/20826P.pdf https://doi.org/10.1002/2016JF004121 |
long_lat |
ENVELOPE(-48.117,-48.117,-79.333,-79.333) ENVELOPE(-60.000,-60.000,-83.250,-83.250) ENVELOPE(-58.000,-58.000,-83.500,-83.500) ENVELOPE(-26.000,-26.000,-80.833,-80.833) |
geographic |
Antarctic Berkner Island Foundation Ice Stream Pensacola Mountains Shackleton Shackleton Range The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Berkner Island Foundation Ice Stream Pensacola Mountains Shackleton Shackleton Range The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Berkner Island Foundation Ice Stream Ice Sheet Ice Shelf Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Berkner Island Foundation Ice Stream Ice Sheet Ice Shelf Weddell Sea |
op_source |
Journal of geophysical research. Earth surface, 2017, Vol.122(1), pp.371-397 [Peer Reviewed Journal] |
op_relation |
dro:20826 issn:2169-9011 doi:10.1002/2016JF004121 http://dro.dur.ac.uk/20826/ https://doi.org/10.1002/2016JF004121 http://dro.dur.ac.uk/20826/1/20826.pdf http://dro.dur.ac.uk/20826/2/20826P.pdf |
op_rights |
© 2016. 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/10.1002/2016JF004121 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
122 |
container_issue |
1 |
container_start_page |
371 |
op_container_end_page |
397 |
_version_ |
1766272399872884736 |