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...
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Wiley-Blackwell Publishing, Inc.
2017
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ftunivzuerich:oai:www.zora.uzh.ch:145477 2024-09-30T14:24:49+00:00 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 application/pdf https://www.zora.uzh.ch/id/eprint/145477/ https://www.zora.uzh.ch/id/eprint/145477/1/2017_Whitehouse_et_al2017JournalofGeophysicalResearchEarthSurface.pdf https://doi.org/10.5167/uzh-145477 https://doi.org/10.1002/2016JF004121 eng eng Wiley-Blackwell Publishing, Inc. https://www.zora.uzh.ch/id/eprint/145477/1/2017_Whitehouse_et_al2017JournalofGeophysicalResearchEarthSurface.pdf doi:10.5167/uzh-145477 doi:10.1002/2016JF004121 urn:issn:2169-9011 info:eu-repo/semantics/openAccess Creative Commons: Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/ Whitehouse, Pippa L; Bentley, Michael J; Vieli, Andreas; Jamieson, Stewart S R; Hein, Andrew S; Sugden, David E (2017). Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica. Journal of Geophysical Research: Earth Surface, 122(1):371-397. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftunivzuerich https://doi.org/10.5167/uzh-14547710.1002/2016JF004121 2024-09-18T00:49:49Z 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 Berner Island and at the continental shelf break. Global mean sea-level contributions associated with these two scenarios are ~50mm 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 Antarctica Journal Foundation Ice Stream Ice Sheet Ice Shelf Weddell Sea University of Zurich (UZH): ZORA (Zurich Open Repository and Archive Antarctic 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 |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel |
spellingShingle |
Institute of Geography 910 Geography & travel 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 |
topic_facet |
Institute of Geography 910 Geography & travel |
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 Berner Island and at the continental shelf break. Global mean sea-level contributions associated with these two scenarios are ~50mm 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 |
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 |
Wiley-Blackwell Publishing, Inc. |
publishDate |
2017 |
url |
https://www.zora.uzh.ch/id/eprint/145477/ https://www.zora.uzh.ch/id/eprint/145477/1/2017_Whitehouse_et_al2017JournalofGeophysicalResearchEarthSurface.pdf https://doi.org/10.5167/uzh-145477 https://doi.org/10.1002/2016JF004121 |
long_lat |
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 Foundation Ice Stream Pensacola Mountains Shackleton Shackleton Range The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Foundation Ice Stream Pensacola Mountains Shackleton Shackleton Range The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Antarctica Journal Foundation Ice Stream Ice Sheet Ice Shelf Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal Foundation Ice Stream Ice Sheet Ice Shelf Weddell Sea |
op_source |
Whitehouse, Pippa L; Bentley, Michael J; Vieli, Andreas; Jamieson, Stewart S R; Hein, Andrew S; Sugden, David E (2017). Controls on Last Glacial Maximum ice extent in the Weddell Sea embayment, Antarctica. Journal of Geophysical Research: Earth Surface, 122(1):371-397. |
op_relation |
https://www.zora.uzh.ch/id/eprint/145477/1/2017_Whitehouse_et_al2017JournalofGeophysicalResearchEarthSurface.pdf doi:10.5167/uzh-145477 doi:10.1002/2016JF004121 urn:issn:2169-9011 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons: Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.5167/uzh-14547710.1002/2016JF004121 |
_version_ |
1811642395264024576 |