The Influence of Pine Island Ice Shelf Calving on Basal Melting
The combination of the Pine Island Ice Shelf (PIIS) draft and a seabed ridge beneath it form a topographic barrier, restricting access of warm Circumpolar Deep Water to a cavity inshore of the ridge, thus exerting an important control on PIIS basal ablation. In addition, PIIS has recently experience...
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
Language: | English |
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American Geophysical Union
2022
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/50094/ https://doi.org/10.1029/2022jc018621 https://nrl.northumbria.ac.uk/id/eprint/50094/1/JGR%20Oceans%20-%202022%20-%20Bradley%20-%20The%20Influence%20of%20Pine%20Island%20Ice%20Shelf%20Calving%20on%20Basal%20Melting.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:50094 2023-05-15T13:44:52+02:00 The Influence of Pine Island Ice Shelf Calving on Basal Melting Bradley, A. T. Bett, D. T. Dutrieux, P. de Rydt, Jan Holland, P. R. 2022-09-09 text https://nrl.northumbria.ac.uk/id/eprint/50094/ https://doi.org/10.1029/2022jc018621 https://nrl.northumbria.ac.uk/id/eprint/50094/1/JGR%20Oceans%20-%202022%20-%20Bradley%20-%20The%20Influence%20of%20Pine%20Island%20Ice%20Shelf%20Calving%20on%20Basal%20Melting.pdf en eng American Geophysical Union https://nrl.northumbria.ac.uk/id/eprint/50094/1/JGR%20Oceans%20-%202022%20-%20Bradley%20-%20The%20Influence%20of%20Pine%20Island%20Ice%20Shelf%20Calving%20on%20Basal%20Melting.pdf Bradley, A. T., Bett, D. T., Dutrieux, P., de Rydt, Jan and Holland, P. R. (2022) The Influence of Pine Island Ice Shelf Calving on Basal Melting. Journal of Geophysical Research: Oceans, 127 (9). e2022JC018621. ISSN 2169-9275 cc_by_4_0 CC-BY F700 Ocean Sciences F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2022 ftunivnorthumb https://doi.org/10.1029/2022jc018621 2022-09-25T06:16:09Z The combination of the Pine Island Ice Shelf (PIIS) draft and a seabed ridge beneath it form a topographic barrier, restricting access of warm Circumpolar Deep Water to a cavity inshore of the ridge, thus exerting an important control on PIIS basal ablation. In addition, PIIS has recently experienced several large calving events and further calving could significantly alter the cavity geometry. Changes in the ice front location, together with changes in ice thickness, might relax the topographic barrier and thus significantly change basal melt rates. Here, we consider the impact of past, and possible future, calving events on PIIS melt rates. We use a high‐resolution ocean model to simulate melt rates in both an idealized domain whose geometry captures the salient features of Pine Island Glacier, and a realistic geometry accurately resembling it, to explore how calving affects melt rates. The idealized simulations reveal that the melt response to calving has a sensitive dependence on the thickness of the gap between PIIS and the seabed ridge and inform our interpretation of the realistic simulations, which suggest that PIIS melt rates did not respond significantly to recent calving. However, the mean melt rate increases approximately linearly with further calving, and is amplified by approximately 10% relative to present day once the ice front reaches the ridge‐crest, taking less than one decade if calving maintains its present rate. This provides strong evidence that calving may represent an important, but as yet unexplored, contribution to the ice‐ocean sensitivity of the West Antarctic Ice Sheet. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ice Shelf Pine Island Glacier Northumbria University, Newcastle: Northumbria Research Link (NRL) Antarctic Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) West Antarctic Ice Sheet Journal of Geophysical Research: Oceans 127 9 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F700 Ocean Sciences F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F700 Ocean Sciences F800 Physical and Terrestrial Geographical and Environmental Sciences Bradley, A. T. Bett, D. T. Dutrieux, P. de Rydt, Jan Holland, P. R. The Influence of Pine Island Ice Shelf Calving on Basal Melting |
topic_facet |
F700 Ocean Sciences F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
The combination of the Pine Island Ice Shelf (PIIS) draft and a seabed ridge beneath it form a topographic barrier, restricting access of warm Circumpolar Deep Water to a cavity inshore of the ridge, thus exerting an important control on PIIS basal ablation. In addition, PIIS has recently experienced several large calving events and further calving could significantly alter the cavity geometry. Changes in the ice front location, together with changes in ice thickness, might relax the topographic barrier and thus significantly change basal melt rates. Here, we consider the impact of past, and possible future, calving events on PIIS melt rates. We use a high‐resolution ocean model to simulate melt rates in both an idealized domain whose geometry captures the salient features of Pine Island Glacier, and a realistic geometry accurately resembling it, to explore how calving affects melt rates. The idealized simulations reveal that the melt response to calving has a sensitive dependence on the thickness of the gap between PIIS and the seabed ridge and inform our interpretation of the realistic simulations, which suggest that PIIS melt rates did not respond significantly to recent calving. However, the mean melt rate increases approximately linearly with further calving, and is amplified by approximately 10% relative to present day once the ice front reaches the ridge‐crest, taking less than one decade if calving maintains its present rate. This provides strong evidence that calving may represent an important, but as yet unexplored, contribution to the ice‐ocean sensitivity of the West Antarctic Ice Sheet. |
format |
Article in Journal/Newspaper |
author |
Bradley, A. T. Bett, D. T. Dutrieux, P. de Rydt, Jan Holland, P. R. |
author_facet |
Bradley, A. T. Bett, D. T. Dutrieux, P. de Rydt, Jan Holland, P. R. |
author_sort |
Bradley, A. T. |
title |
The Influence of Pine Island Ice Shelf Calving on Basal Melting |
title_short |
The Influence of Pine Island Ice Shelf Calving on Basal Melting |
title_full |
The Influence of Pine Island Ice Shelf Calving on Basal Melting |
title_fullStr |
The Influence of Pine Island Ice Shelf Calving on Basal Melting |
title_full_unstemmed |
The Influence of Pine Island Ice Shelf Calving on Basal Melting |
title_sort |
influence of pine island ice shelf calving on basal melting |
publisher |
American Geophysical Union |
publishDate |
2022 |
url |
https://nrl.northumbria.ac.uk/id/eprint/50094/ https://doi.org/10.1029/2022jc018621 https://nrl.northumbria.ac.uk/id/eprint/50094/1/JGR%20Oceans%20-%202022%20-%20Bradley%20-%20The%20Influence%20of%20Pine%20Island%20Ice%20Shelf%20Calving%20on%20Basal%20Melting.pdf |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Antarctic Pine Island Glacier West Antarctic Ice Sheet |
geographic_facet |
Antarctic Pine Island Glacier West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Ice Sheet Ice Shelf Pine Island Glacier |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelf Pine Island Glacier |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/50094/1/JGR%20Oceans%20-%202022%20-%20Bradley%20-%20The%20Influence%20of%20Pine%20Island%20Ice%20Shelf%20Calving%20on%20Basal%20Melting.pdf Bradley, A. T., Bett, D. T., Dutrieux, P., de Rydt, Jan and Holland, P. R. (2022) The Influence of Pine Island Ice Shelf Calving on Basal Melting. Journal of Geophysical Research: Oceans, 127 (9). e2022JC018621. ISSN 2169-9275 |
op_rights |
cc_by_4_0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2022jc018621 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
9 |
_version_ |
1766207958760292352 |