Ice‐Front Retreat Controls on Ocean Dynamics Under Larsen C Ice Shelf, Antarctica
Abstract Iceberg A‐68 separated from the Larsen C Ice Shelf in July 2017 and the impact of this event on the local ocean circulation has yet to be assessed. Here, we conduct numerical simulations of ocean dynamics near and below the ice shelf pre‐ and post‐calving. Results agree with in situ and rem...
Published in: | Geophysical Research Letters |
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ftdoajarticles:oai:doaj.org/article:ae0df988409f4e4c8532fe1040beebcb 2024-09-15T17:48:19+00:00 Ice‐Front Retreat Controls on Ocean Dynamics Under Larsen C Ice Shelf, Antarctica M. Poinelli Y. Nakayama E. Larour M. Vizcaino R. Riva 2023-09-01T00:00:00Z https://doi.org/10.1029/2023GL104588 https://doaj.org/article/ae0df988409f4e4c8532fe1040beebcb EN eng Wiley https://doi.org/10.1029/2023GL104588 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2023GL104588 https://doaj.org/article/ae0df988409f4e4c8532fe1040beebcb Geophysical Research Letters, Vol 50, Iss 18, Pp n/a-n/a (2023) Geophysics. Cosmic physics QC801-809 article 2023 ftdoajarticles https://doi.org/10.1029/2023GL104588 2024-08-05T17:49:23Z Abstract Iceberg A‐68 separated from the Larsen C Ice Shelf in July 2017 and the impact of this event on the local ocean circulation has yet to be assessed. Here, we conduct numerical simulations of ocean dynamics near and below the ice shelf pre‐ and post‐calving. Results agree with in situ and remote observations of the area as they indicate that basal melt is primarily controlled by wintertime sea‐ice formation, which in turn produces High Salinity Shelf Water (HSSW). After the calving event, we simulate a 50% increase in HSSW intrusion under the ice shelf, enhancing ocean heat delivery by 30%. This results in doubling of the melt rate under Gipps Ice Rise, suggesting a positive feedback for further retreat that could destabilize the Larsen C Ice Shelf. Assessing the impact of ice‐front retreat on the heat delivery under the ice is crucial to better understand ice‐shelf dynamics in a warming environment. Article in Journal/Newspaper Antarc* Antarctica Ice Shelf Sea ice Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 50 18 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Geophysics. Cosmic physics QC801-809 M. Poinelli Y. Nakayama E. Larour M. Vizcaino R. Riva Ice‐Front Retreat Controls on Ocean Dynamics Under Larsen C Ice Shelf, Antarctica |
topic_facet |
Geophysics. Cosmic physics QC801-809 |
description |
Abstract Iceberg A‐68 separated from the Larsen C Ice Shelf in July 2017 and the impact of this event on the local ocean circulation has yet to be assessed. Here, we conduct numerical simulations of ocean dynamics near and below the ice shelf pre‐ and post‐calving. Results agree with in situ and remote observations of the area as they indicate that basal melt is primarily controlled by wintertime sea‐ice formation, which in turn produces High Salinity Shelf Water (HSSW). After the calving event, we simulate a 50% increase in HSSW intrusion under the ice shelf, enhancing ocean heat delivery by 30%. This results in doubling of the melt rate under Gipps Ice Rise, suggesting a positive feedback for further retreat that could destabilize the Larsen C Ice Shelf. Assessing the impact of ice‐front retreat on the heat delivery under the ice is crucial to better understand ice‐shelf dynamics in a warming environment. |
format |
Article in Journal/Newspaper |
author |
M. Poinelli Y. Nakayama E. Larour M. Vizcaino R. Riva |
author_facet |
M. Poinelli Y. Nakayama E. Larour M. Vizcaino R. Riva |
author_sort |
M. Poinelli |
title |
Ice‐Front Retreat Controls on Ocean Dynamics Under Larsen C Ice Shelf, Antarctica |
title_short |
Ice‐Front Retreat Controls on Ocean Dynamics Under Larsen C Ice Shelf, Antarctica |
title_full |
Ice‐Front Retreat Controls on Ocean Dynamics Under Larsen C Ice Shelf, Antarctica |
title_fullStr |
Ice‐Front Retreat Controls on Ocean Dynamics Under Larsen C Ice Shelf, Antarctica |
title_full_unstemmed |
Ice‐Front Retreat Controls on Ocean Dynamics Under Larsen C Ice Shelf, Antarctica |
title_sort |
ice‐front retreat controls on ocean dynamics under larsen c ice shelf, antarctica |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1029/2023GL104588 https://doaj.org/article/ae0df988409f4e4c8532fe1040beebcb |
genre |
Antarc* Antarctica Ice Shelf Sea ice |
genre_facet |
Antarc* Antarctica Ice Shelf Sea ice |
op_source |
Geophysical Research Letters, Vol 50, Iss 18, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2023GL104588 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2023GL104588 https://doaj.org/article/ae0df988409f4e4c8532fe1040beebcb |
op_doi |
https://doi.org/10.1029/2023GL104588 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
18 |
_version_ |
1810289471275401216 |