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: | http://nora.nerc.ac.uk/id/eprint/532257/ https://nora.nerc.ac.uk/id/eprint/532257/1/JGR%20Oceans%20-%202022%20-%20Bradley%20-%20The%20Influence%20of%20Pine%20Island%20Ice%20Shelf%20Calving%20on%20Basal%20Melting.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JC018621 |
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ftnerc:oai:nora.nerc.ac.uk:532257 2023-05-15T13:41:46+02:00 The influence of Pine Island Ice Shelf calving on basal melting Bradley, A.T. Bett, D.T. Dutrieux, P. De Rydt, J. Holland, P.R. 2022-09-09 text http://nora.nerc.ac.uk/id/eprint/532257/ https://nora.nerc.ac.uk/id/eprint/532257/1/JGR%20Oceans%20-%202022%20-%20Bradley%20-%20The%20Influence%20of%20Pine%20Island%20Ice%20Shelf%20Calving%20on%20Basal%20Melting.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JC018621 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/532257/1/JGR%20Oceans%20-%202022%20-%20Bradley%20-%20The%20Influence%20of%20Pine%20Island%20Ice%20Shelf%20Calving%20on%20Basal%20Melting.pdf Bradley, A.T. orcid:0000-0001-8381-5317 Bett, D.T. orcid:0000-0003-3118-9902 Dutrieux, P. orcid:0000-0002-8066-934X De Rydt, J.; Holland, P.R. orcid:0000-0001-8370-289X . 2022 The influence of Pine Island Ice Shelf calving on basal melting. Journal of Geophysical Research: Oceans, 127 (9), e2022JC018621. 27, pp. https://doi.org/10.1029/2022JC018621 <https://doi.org/10.1029/2022JC018621> cc_by_4 CC-BY Publication - Article PeerReviewed 2022 ftnerc https://doi.org/10.1029/2022JC018621 2023-02-04T19:53:07Z 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 PIG, 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 Natural Environment Research Council: NERC Open Research Archive Antarctic West Antarctic Ice Sheet Journal of Geophysical Research: Oceans 127 9 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
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 PIG, 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, J. Holland, P.R. |
spellingShingle |
Bradley, A.T. Bett, D.T. Dutrieux, P. De Rydt, J. Holland, P.R. The influence of Pine Island Ice Shelf calving on basal melting |
author_facet |
Bradley, A.T. Bett, D.T. Dutrieux, P. De Rydt, J. 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 |
http://nora.nerc.ac.uk/id/eprint/532257/ https://nora.nerc.ac.uk/id/eprint/532257/1/JGR%20Oceans%20-%202022%20-%20Bradley%20-%20The%20Influence%20of%20Pine%20Island%20Ice%20Shelf%20Calving%20on%20Basal%20Melting.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JC018621 |
geographic |
Antarctic West Antarctic Ice Sheet |
geographic_facet |
Antarctic West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelf |
op_relation |
https://nora.nerc.ac.uk/id/eprint/532257/1/JGR%20Oceans%20-%202022%20-%20Bradley%20-%20The%20Influence%20of%20Pine%20Island%20Ice%20Shelf%20Calving%20on%20Basal%20Melting.pdf Bradley, A.T. orcid:0000-0001-8381-5317 Bett, D.T. orcid:0000-0003-3118-9902 Dutrieux, P. orcid:0000-0002-8066-934X De Rydt, J.; Holland, P.R. orcid:0000-0001-8370-289X . 2022 The influence of Pine Island Ice Shelf calving on basal melting. Journal of Geophysical Research: Oceans, 127 (9), e2022JC018621. 27, pp. https://doi.org/10.1029/2022JC018621 <https://doi.org/10.1029/2022JC018621> |
op_rights |
cc_by_4 |
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_ |
1766157814879748096 |