Selective erosion beneath the Antarctic Peninsula Ice Sheet during LGM retreat
Abstract In mountainous terrain, the relationship between ice sheet dynamics and basal topography is complex, with each component influencing the other. This paper investigates how the last glacial maximum Antarctic Peninsula Ice Sheet might have modified its bed both at maximum extent and during pr...
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Online Access: | http://dx.doi.org/10.1017/s0954102014000340 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102014000340 |
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crcambridgeupr:10.1017/s0954102014000340 2024-03-03T08:38:02+00:00 Selective erosion beneath the Antarctic Peninsula Ice Sheet during LGM retreat Golledge, Nicholas R. 2014 http://dx.doi.org/10.1017/s0954102014000340 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102014000340 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/3.0/ Antarctic Science volume 26, issue 6, page 698-707 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2014 crcambridgeupr https://doi.org/10.1017/s0954102014000340 2024-02-08T08:26:31Z Abstract In mountainous terrain, the relationship between ice sheet dynamics and basal topography is complex, with each component influencing the other. This paper investigates how the last glacial maximum Antarctic Peninsula Ice Sheet might have modified its bed both at maximum extent and during progressive grounding line retreat. Focussing on the Marguerite Trough Ice Stream we then examine the degree to which basal topographical conditions affected the rate of ocean-forced recession. Zones of peak subglacial erosion are preferentially located in areas of convergent flow and where horizontal strain rates are highest. During ice sheet retreat, potential erosion rates increase in these areas, but the foci remain fixed. This leads to selective and progressive deepening of subglacial basins. As grounding lines migrate landward, faster retreat tends to occur over subglacial basins, especially if flow is divergent, whereas slower retreat takes place on sloping beds and where the geometry of the outlet allows convergent flow and a non-negative flux balance. In conclusion the Antarctic Peninsula Ice Sheet selectively erodes its bed beneath linear outlets and, over successive glacial cycles, progressive deepening of subglacial basins may bring about non-linear retreat of the ice sheet margin. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Ice Sheet Cambridge University Press Antarctic The Antarctic Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Antarctic Science 26 6 698 707 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Golledge, Nicholas R. Selective erosion beneath the Antarctic Peninsula Ice Sheet during LGM retreat |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract In mountainous terrain, the relationship between ice sheet dynamics and basal topography is complex, with each component influencing the other. This paper investigates how the last glacial maximum Antarctic Peninsula Ice Sheet might have modified its bed both at maximum extent and during progressive grounding line retreat. Focussing on the Marguerite Trough Ice Stream we then examine the degree to which basal topographical conditions affected the rate of ocean-forced recession. Zones of peak subglacial erosion are preferentially located in areas of convergent flow and where horizontal strain rates are highest. During ice sheet retreat, potential erosion rates increase in these areas, but the foci remain fixed. This leads to selective and progressive deepening of subglacial basins. As grounding lines migrate landward, faster retreat tends to occur over subglacial basins, especially if flow is divergent, whereas slower retreat takes place on sloping beds and where the geometry of the outlet allows convergent flow and a non-negative flux balance. In conclusion the Antarctic Peninsula Ice Sheet selectively erodes its bed beneath linear outlets and, over successive glacial cycles, progressive deepening of subglacial basins may bring about non-linear retreat of the ice sheet margin. |
format |
Article in Journal/Newspaper |
author |
Golledge, Nicholas R. |
author_facet |
Golledge, Nicholas R. |
author_sort |
Golledge, Nicholas R. |
title |
Selective erosion beneath the Antarctic Peninsula Ice Sheet during LGM retreat |
title_short |
Selective erosion beneath the Antarctic Peninsula Ice Sheet during LGM retreat |
title_full |
Selective erosion beneath the Antarctic Peninsula Ice Sheet during LGM retreat |
title_fullStr |
Selective erosion beneath the Antarctic Peninsula Ice Sheet during LGM retreat |
title_full_unstemmed |
Selective erosion beneath the Antarctic Peninsula Ice Sheet during LGM retreat |
title_sort |
selective erosion beneath the antarctic peninsula ice sheet during lgm retreat |
publisher |
Cambridge University Press (CUP) |
publishDate |
2014 |
url |
http://dx.doi.org/10.1017/s0954102014000340 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102014000340 |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Marguerite |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Marguerite |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Ice Sheet |
op_source |
Antarctic Science volume 26, issue 6, page 698-707 ISSN 0954-1020 1365-2079 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.1017/s0954102014000340 |
container_title |
Antarctic Science |
container_volume |
26 |
container_issue |
6 |
container_start_page |
698 |
op_container_end_page |
707 |
_version_ |
1792503876284317696 |