Interocean exchanges and the spreading of Antarctic Intermediate Water south of Africa
International audience Argo hydrographic profiles collected from 2004 to 2011 in the southeast Atlantic sector of the Southern Ocean are used in combination with hydrographic transects to describe the characteristics of Antarctic Intermediate Water (AAIW) in the region. Making use of the recently de...
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ftunivbrest:oai:HAL:hal-00783595v1 2023-12-17T10:21:41+01:00 Interocean exchanges and the spreading of Antarctic Intermediate Water south of Africa Rusciano, Emanuela Speich, Sabrina Ollitrault, Michel Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2012 https://hal.science/hal-00783595 https://doi.org/10.1029/2012JC008266 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2012JC008266 hal-00783595 https://hal.science/hal-00783595 doi:10.1029/2012JC008266 ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00783595 Journal of Geophysical Research, 2012, 117, pp.C10010. ⟨10.1029/2012JC008266⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2012 ftunivbrest https://doi.org/10.1029/2012JC008266 2023-11-21T23:36:22Z International audience Argo hydrographic profiles collected from 2004 to 2011 in the southeast Atlantic sector of the Southern Ocean are used in combination with hydrographic transects to describe the characteristics of Antarctic Intermediate Water (AAIW) in the region. Making use of the recently developed ANDRO velocity data set, we estimate the evolution of the dynamical properties of different AAIW varieties along their pathways within the isoneutral layer (27.1 < gn < 27.6). Three different regional varieties of intermediate water converge in the southeast Atlantic: Atlantic AAIW (A-AAIW, characterized by S ≤ 34.2), Indian AAIW (I-AAIW, S ≥ 34.3), and a previously unknown variety that we named Indo-Atlantic intermediate water (IA-AAIW, 34.2 < S < 34.3). South of Africa, the I-AAIW flowing within the Agulhas Current separates into two branches. One branch retroflects following the Agulhas Return Current (13.4 Sv) and proceeds back to the Indian Ocean. The other one separates from the Agulhas Current, and flows into the southeast Atlantic via the Cape Basin within mesoscale eddies (13.5 Sv). A-AAIW enters the domain between the Subtropical Front and the Subantarctic Front (36 Sv). Part of this water (28 Sv) flows eastward into the Indian Ocean, while 10 Sv are injected into the Cape Basin and mix with I-AAIW giving rise to the new IA-AAIW variety. The latter separates into two branches, both transporting 7.4 Sv. One flows northwestward and subducts along the Northern Subtropical Front, while the other moves eastward to contribute a sizable volume of fresh and oxygenated water to the Indian Ocean. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Université de Bretagne Occidentale: HAL Antarctic Southern Ocean Indian Journal of Geophysical Research: Oceans 117 C10 n/a n/a |
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Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Rusciano, Emanuela Speich, Sabrina Ollitrault, Michel Interocean exchanges and the spreading of Antarctic Intermediate Water south of Africa |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Argo hydrographic profiles collected from 2004 to 2011 in the southeast Atlantic sector of the Southern Ocean are used in combination with hydrographic transects to describe the characteristics of Antarctic Intermediate Water (AAIW) in the region. Making use of the recently developed ANDRO velocity data set, we estimate the evolution of the dynamical properties of different AAIW varieties along their pathways within the isoneutral layer (27.1 < gn < 27.6). Three different regional varieties of intermediate water converge in the southeast Atlantic: Atlantic AAIW (A-AAIW, characterized by S ≤ 34.2), Indian AAIW (I-AAIW, S ≥ 34.3), and a previously unknown variety that we named Indo-Atlantic intermediate water (IA-AAIW, 34.2 < S < 34.3). South of Africa, the I-AAIW flowing within the Agulhas Current separates into two branches. One branch retroflects following the Agulhas Return Current (13.4 Sv) and proceeds back to the Indian Ocean. The other one separates from the Agulhas Current, and flows into the southeast Atlantic via the Cape Basin within mesoscale eddies (13.5 Sv). A-AAIW enters the domain between the Subtropical Front and the Subantarctic Front (36 Sv). Part of this water (28 Sv) flows eastward into the Indian Ocean, while 10 Sv are injected into the Cape Basin and mix with I-AAIW giving rise to the new IA-AAIW variety. The latter separates into two branches, both transporting 7.4 Sv. One flows northwestward and subducts along the Northern Subtropical Front, while the other moves eastward to contribute a sizable volume of fresh and oxygenated water to the Indian Ocean. |
author2 |
Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Rusciano, Emanuela Speich, Sabrina Ollitrault, Michel |
author_facet |
Rusciano, Emanuela Speich, Sabrina Ollitrault, Michel |
author_sort |
Rusciano, Emanuela |
title |
Interocean exchanges and the spreading of Antarctic Intermediate Water south of Africa |
title_short |
Interocean exchanges and the spreading of Antarctic Intermediate Water south of Africa |
title_full |
Interocean exchanges and the spreading of Antarctic Intermediate Water south of Africa |
title_fullStr |
Interocean exchanges and the spreading of Antarctic Intermediate Water south of Africa |
title_full_unstemmed |
Interocean exchanges and the spreading of Antarctic Intermediate Water south of Africa |
title_sort |
interocean exchanges and the spreading of antarctic intermediate water south of africa |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-00783595 https://doi.org/10.1029/2012JC008266 |
geographic |
Antarctic Southern Ocean Indian |
geographic_facet |
Antarctic Southern Ocean Indian |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00783595 Journal of Geophysical Research, 2012, 117, pp.C10010. ⟨10.1029/2012JC008266⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2012JC008266 hal-00783595 https://hal.science/hal-00783595 doi:10.1029/2012JC008266 |
op_doi |
https://doi.org/10.1029/2012JC008266 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
117 |
container_issue |
C10 |
container_start_page |
n/a |
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n/a |
_version_ |
1785537529308512256 |