Warm modified circumpolar deep water intrusions drive ice shelf melt and inhibit dense shelf water formation in Vincennes Bay, East Antarctica
Antarctic Bottom Water (AABW) production supplies the deep limb of the global overturning circulation and ventilates the deep ocean. While the Weddell and Ross Seas are recognized as key sites for AABW production, additional sources have been discovered in coastal polynya regions around East Antarct...
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Online Access: | https://doi.org/10.1029/2020JC016998 http://ecite.utas.edu.au/151761 |
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ftunivtasecite:oai:ecite.utas.edu.au:151761 2023-05-15T13:42:41+02:00 Warm modified circumpolar deep water intrusions drive ice shelf melt and inhibit dense shelf water formation in Vincennes Bay, East Antarctica Ribeiro, N Herraiz-Borreguero, L Rintoul, SR McMahon, CR Hindell, M Harcourt, R Williams, G 2021 https://doi.org/10.1029/2020JC016998 http://ecite.utas.edu.au/151761 en eng Wiley-Blackwell Publishing Inc. http://dx.doi.org/10.1029/2020JC016998 Ribeiro, N and Herraiz-Borreguero, L and Rintoul, SR and McMahon, CR and Hindell, M and Harcourt, R and Williams, G, Warm modified circumpolar deep water intrusions drive ice shelf melt and inhibit dense shelf water formation in Vincennes Bay, East Antarctica, Journal of Geophysical Research-Oceans, 126, (8) Article e2020JC016998. ISSN 2169-9275 (2021) [Refereed Article] http://ecite.utas.edu.au/151761 Earth Sciences Oceanography Physical oceanography Refereed Article PeerReviewed 2021 ftunivtasecite https://doi.org/10.1029/2020JC016998 2022-11-21T23:17:12Z Antarctic Bottom Water (AABW) production supplies the deep limb of the global overturning circulation and ventilates the deep ocean. While the Weddell and Ross Seas are recognized as key sites for AABW production, additional sources have been discovered in coastal polynya regions around East Antarctica, most recently at Vincennes Bay. Vincennes Bay, despite encompassing two distinct polynya regions, is considered the weakest source, producing Dense Shelf Water (DSW) only just dense enough to contribute to the lighter density classes of AABW found offshore. Here we provide the first detailed oceanographic observations of the continental shelf in Vincennes Bay (104-111E), using CTD data from instrumented elephant seals spanning from February to November of 2012. We find that Vincennes Bay has East Antarcticas warmest recorded intrusions of modified Circumpolar Deep Water (mCDW) and that warm mCDW drives basal melt under Vanderford and Underwood ice shelves. Our study also provides the first direct observational evidence for the inflow of meltwater to this region, which increases stratification and hinders DSW formation, and thus AABW production. The Vincennes Bay glaciers, together with the Totten Glacier, drain part of the Aurora Basin, which holds up to 7 m of sea level rise equivalent. Our results highlight the vulnerability of the East Antarctic Ice Sheet to intrusions of mCDW. Article in Journal/Newspaper Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Elephant Seals Ice Sheet Ice Shelf Ice Shelves Totten Glacier eCite UTAS (University of Tasmania) Antarctic East Antarctica East Antarctic Ice Sheet Weddell Underwood ENVELOPE(49.350,49.350,-68.133,-68.133) Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) Vincennes Bay ENVELOPE(109.500,109.500,-66.500,-66.500) Journal of Geophysical Research: Oceans 126 8 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical oceanography |
spellingShingle |
Earth Sciences Oceanography Physical oceanography Ribeiro, N Herraiz-Borreguero, L Rintoul, SR McMahon, CR Hindell, M Harcourt, R Williams, G Warm modified circumpolar deep water intrusions drive ice shelf melt and inhibit dense shelf water formation in Vincennes Bay, East Antarctica |
topic_facet |
Earth Sciences Oceanography Physical oceanography |
description |
Antarctic Bottom Water (AABW) production supplies the deep limb of the global overturning circulation and ventilates the deep ocean. While the Weddell and Ross Seas are recognized as key sites for AABW production, additional sources have been discovered in coastal polynya regions around East Antarctica, most recently at Vincennes Bay. Vincennes Bay, despite encompassing two distinct polynya regions, is considered the weakest source, producing Dense Shelf Water (DSW) only just dense enough to contribute to the lighter density classes of AABW found offshore. Here we provide the first detailed oceanographic observations of the continental shelf in Vincennes Bay (104-111E), using CTD data from instrumented elephant seals spanning from February to November of 2012. We find that Vincennes Bay has East Antarcticas warmest recorded intrusions of modified Circumpolar Deep Water (mCDW) and that warm mCDW drives basal melt under Vanderford and Underwood ice shelves. Our study also provides the first direct observational evidence for the inflow of meltwater to this region, which increases stratification and hinders DSW formation, and thus AABW production. The Vincennes Bay glaciers, together with the Totten Glacier, drain part of the Aurora Basin, which holds up to 7 m of sea level rise equivalent. Our results highlight the vulnerability of the East Antarctic Ice Sheet to intrusions of mCDW. |
format |
Article in Journal/Newspaper |
author |
Ribeiro, N Herraiz-Borreguero, L Rintoul, SR McMahon, CR Hindell, M Harcourt, R Williams, G |
author_facet |
Ribeiro, N Herraiz-Borreguero, L Rintoul, SR McMahon, CR Hindell, M Harcourt, R Williams, G |
author_sort |
Ribeiro, N |
title |
Warm modified circumpolar deep water intrusions drive ice shelf melt and inhibit dense shelf water formation in Vincennes Bay, East Antarctica |
title_short |
Warm modified circumpolar deep water intrusions drive ice shelf melt and inhibit dense shelf water formation in Vincennes Bay, East Antarctica |
title_full |
Warm modified circumpolar deep water intrusions drive ice shelf melt and inhibit dense shelf water formation in Vincennes Bay, East Antarctica |
title_fullStr |
Warm modified circumpolar deep water intrusions drive ice shelf melt and inhibit dense shelf water formation in Vincennes Bay, East Antarctica |
title_full_unstemmed |
Warm modified circumpolar deep water intrusions drive ice shelf melt and inhibit dense shelf water formation in Vincennes Bay, East Antarctica |
title_sort |
warm modified circumpolar deep water intrusions drive ice shelf melt and inhibit dense shelf water formation in vincennes bay, east antarctica |
publisher |
Wiley-Blackwell Publishing Inc. |
publishDate |
2021 |
url |
https://doi.org/10.1029/2020JC016998 http://ecite.utas.edu.au/151761 |
long_lat |
ENVELOPE(49.350,49.350,-68.133,-68.133) ENVELOPE(116.333,116.333,-66.833,-66.833) ENVELOPE(109.500,109.500,-66.500,-66.500) |
geographic |
Antarctic East Antarctica East Antarctic Ice Sheet Weddell Underwood Totten Glacier Vincennes Bay |
geographic_facet |
Antarctic East Antarctica East Antarctic Ice Sheet Weddell Underwood Totten Glacier Vincennes Bay |
genre |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Elephant Seals Ice Sheet Ice Shelf Ice Shelves Totten Glacier |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Elephant Seals Ice Sheet Ice Shelf Ice Shelves Totten Glacier |
op_relation |
http://dx.doi.org/10.1029/2020JC016998 Ribeiro, N and Herraiz-Borreguero, L and Rintoul, SR and McMahon, CR and Hindell, M and Harcourt, R and Williams, G, Warm modified circumpolar deep water intrusions drive ice shelf melt and inhibit dense shelf water formation in Vincennes Bay, East Antarctica, Journal of Geophysical Research-Oceans, 126, (8) Article e2020JC016998. ISSN 2169-9275 (2021) [Refereed Article] http://ecite.utas.edu.au/151761 |
op_doi |
https://doi.org/10.1029/2020JC016998 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
8 |
_version_ |
1766171567339864064 |