The Transfer of Antarctic Circumpolar Waters to the Western South Atlantic Ocean
Southern Ocean waters enter the South Atlantic Ocean through the Scotia Sea along pathways constrained by the bathymetry of the northern Scotia Sea passages. We use the Argo profiling-float data set to calculate the water transports in and out of the region, focusing on the water balances down to th...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | http://hdl.handle.net/10553/113982 https://doi.org/10.1029/2020JC017025 |
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ftunivlaspalmas:oai:accedacris.ulpgc.es:10553/113982 2023-05-15T14:06:26+02:00 The Transfer of Antarctic Circumpolar Waters to the Western South Atlantic Ocean Abello, Anna Olivé Pelegri, Josep L. Machín Jiménez, Francisco José Vallès Casanova, Ignasi orcid:0000-0003-3136-8898 orcid:0000-0003-0661-2190 orcid:0000-0002-4281-6804 orcid:0000-0003-2084-852X BU-BAS 2021 http://hdl.handle.net/10553/113982 https://doi.org/10.1029/2020JC017025 eng eng El Portal Sudatlántico en la Cinta Transportadora Global CEX2019-000928-S Journal of geophysical research. Oceans 2169-9275 http://hdl.handle.net/10553/113982 doi:10.1029/2020JC017025 2-s2.0-85112014764 WOS:000681412200028 7 Sí Journal of geophysical research. Oceans [ISSN 2169-9275], v. 126 (7), e2020JC017025, (Julio 2021) 2510 Oceanografía Antarctic Circumpolar waters Scotia Sea Argo floats Geostrophic transport Interannual variability Frontal systems info:eu-repo/semantics/article Article 2021 ftunivlaspalmas https://doi.org/10.1029/2020JC017025 2022-03-16T00:11:58Z Southern Ocean waters enter the South Atlantic Ocean through the Scotia Sea along pathways constrained by the bathymetry of the northern Scotia Sea passages. We use the Argo profiling-float data set to calculate the water transports in and out of the region, focusing on the water balances down to the deepest isoneutral sampled in all passages (γn = 28.0 kg m−3, located between about 500 and 2,000 m in the Drake Passage and even shallower in the Northern Passages). Down to this reference level, the water inflow through the Drake Passage is 140.8 ± 7.4 Sv and the water outflow through the deeper portions of the Northern Passages is 115.9 ± 8.3 Sv, implying a leakage of about 25 ± 11.1 Sv over topography shallower than 1,000 m. Below the reference isoneutral and down to 2,000 m, an additional 23.4 Sv enter through the Drake Passage; when added to reported inputs of about 20 Sv through the South Scotia Ridge, this accounts well for the observed 43.4 Sv outflow–from 28.0 kg m−3 to 2,000 m–through the Northern Passages. Relative to the 2,000 m reference level, the mean barotropic contribution always represents over half the total transports. We also observe substantial seasonal and moderate interannual variations in the water transports and composition (peak differences occur seasonally in the Drake Passage, with a range of 111–174 Sv), associated with changes in water exchange across the frontal systems. Two independent measures set the water mean-residence time in the Scotia Sea at about 6–8 months. 3,405 Q1 Article in Journal/Newspaper Antarc* Antarctic Drake Passage Scotia Sea South Atlantic Ocean Southern Ocean Universidad de Las Palmas de Gran Canaria: Acceda Antarctic Drake Passage Scotia Sea South Scotia Ridge ENVELOPE(-46.500,-46.500,-60.000,-60.000) Southern Ocean Journal of Geophysical Research: Oceans 126 7 |
institution |
Open Polar |
collection |
Universidad de Las Palmas de Gran Canaria: Acceda |
op_collection_id |
ftunivlaspalmas |
language |
English |
topic |
2510 Oceanografía Antarctic Circumpolar waters Scotia Sea Argo floats Geostrophic transport Interannual variability Frontal systems |
spellingShingle |
2510 Oceanografía Antarctic Circumpolar waters Scotia Sea Argo floats Geostrophic transport Interannual variability Frontal systems Abello, Anna Olivé Pelegri, Josep L. Machín Jiménez, Francisco José Vallès Casanova, Ignasi The Transfer of Antarctic Circumpolar Waters to the Western South Atlantic Ocean |
topic_facet |
2510 Oceanografía Antarctic Circumpolar waters Scotia Sea Argo floats Geostrophic transport Interannual variability Frontal systems |
description |
Southern Ocean waters enter the South Atlantic Ocean through the Scotia Sea along pathways constrained by the bathymetry of the northern Scotia Sea passages. We use the Argo profiling-float data set to calculate the water transports in and out of the region, focusing on the water balances down to the deepest isoneutral sampled in all passages (γn = 28.0 kg m−3, located between about 500 and 2,000 m in the Drake Passage and even shallower in the Northern Passages). Down to this reference level, the water inflow through the Drake Passage is 140.8 ± 7.4 Sv and the water outflow through the deeper portions of the Northern Passages is 115.9 ± 8.3 Sv, implying a leakage of about 25 ± 11.1 Sv over topography shallower than 1,000 m. Below the reference isoneutral and down to 2,000 m, an additional 23.4 Sv enter through the Drake Passage; when added to reported inputs of about 20 Sv through the South Scotia Ridge, this accounts well for the observed 43.4 Sv outflow–from 28.0 kg m−3 to 2,000 m–through the Northern Passages. Relative to the 2,000 m reference level, the mean barotropic contribution always represents over half the total transports. We also observe substantial seasonal and moderate interannual variations in the water transports and composition (peak differences occur seasonally in the Drake Passage, with a range of 111–174 Sv), associated with changes in water exchange across the frontal systems. Two independent measures set the water mean-residence time in the Scotia Sea at about 6–8 months. 3,405 Q1 |
author2 |
orcid:0000-0003-3136-8898 orcid:0000-0003-0661-2190 orcid:0000-0002-4281-6804 orcid:0000-0003-2084-852X BU-BAS |
format |
Article in Journal/Newspaper |
author |
Abello, Anna Olivé Pelegri, Josep L. Machín Jiménez, Francisco José Vallès Casanova, Ignasi |
author_facet |
Abello, Anna Olivé Pelegri, Josep L. Machín Jiménez, Francisco José Vallès Casanova, Ignasi |
author_sort |
Abello, Anna Olivé |
title |
The Transfer of Antarctic Circumpolar Waters to the Western South Atlantic Ocean |
title_short |
The Transfer of Antarctic Circumpolar Waters to the Western South Atlantic Ocean |
title_full |
The Transfer of Antarctic Circumpolar Waters to the Western South Atlantic Ocean |
title_fullStr |
The Transfer of Antarctic Circumpolar Waters to the Western South Atlantic Ocean |
title_full_unstemmed |
The Transfer of Antarctic Circumpolar Waters to the Western South Atlantic Ocean |
title_sort |
transfer of antarctic circumpolar waters to the western south atlantic ocean |
publishDate |
2021 |
url |
http://hdl.handle.net/10553/113982 https://doi.org/10.1029/2020JC017025 |
long_lat |
ENVELOPE(-46.500,-46.500,-60.000,-60.000) |
geographic |
Antarctic Drake Passage Scotia Sea South Scotia Ridge Southern Ocean |
geographic_facet |
Antarctic Drake Passage Scotia Sea South Scotia Ridge Southern Ocean |
genre |
Antarc* Antarctic Drake Passage Scotia Sea South Atlantic Ocean Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Scotia Sea South Atlantic Ocean Southern Ocean |
op_source |
Journal of geophysical research. Oceans [ISSN 2169-9275], v. 126 (7), e2020JC017025, (Julio 2021) |
op_relation |
El Portal Sudatlántico en la Cinta Transportadora Global CEX2019-000928-S Journal of geophysical research. Oceans 2169-9275 http://hdl.handle.net/10553/113982 doi:10.1029/2020JC017025 2-s2.0-85112014764 WOS:000681412200028 7 Sí |
op_doi |
https://doi.org/10.1029/2020JC017025 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
7 |
_version_ |
1766278144012058624 |