Circulation and Water Mass Modification in the Brazil–Malvinas Confluence
The confluence between the Brazil Current and the Malvinas Current [the Brazil–Malvinas Confluence (BMC)] in the Argentine Basin is characterized by a complicated thermohaline structure favoring the exchanges of mass, heat, and salt between the subtropical gyre and the Antarctic Circumpolar Current...
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:15941 2023-05-15T13:41:03+02:00 Circulation and Water Mass Modification in the Brazil–Malvinas Confluence Jullion, Loic Heywood, Karen J. Naveira Garabato, Alberto C. Stevens, David P. 2010-05 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/15941/ https://ueaeprints.uea.ac.uk/id/eprint/15941/1/DS_53.pdf https://doi.org/10.1175/2009JPO4174.1 en eng https://ueaeprints.uea.ac.uk/id/eprint/15941/1/DS_53.pdf Jullion, Loic, Heywood, Karen J., Naveira Garabato, Alberto C. and Stevens, David P. (2010) Circulation and Water Mass Modification in the Brazil–Malvinas Confluence. Journal of Physical Oceanography, 40 (5). pp. 845-864. ISSN 0022-3670 doi:10.1175/2009JPO4174.1 Article PeerReviewed 2010 ftuniveastangl https://doi.org/10.1175/2009JPO4174.1 2023-03-23T23:31:22Z The confluence between the Brazil Current and the Malvinas Current [the Brazil–Malvinas Confluence (BMC)] in the Argentine Basin is characterized by a complicated thermohaline structure favoring the exchanges of mass, heat, and salt between the subtropical gyre and the Antarctic Circumpolar Current (ACC). Analysis of thermohaline properties of hydrographic sections in the BMC reveals strong interactions between the ACC and subtropical fronts. In the Subantarctic Front, Subantarctic Mode Water (SAMW), Antarctic Intermediate Water (AAIW), and Circumpolar Deep Water (CDW) warm (become saltier) by 0.4° (0.08), 0.3° (0.02), and 0.6°C (0.1), respectively. In the subtropical gyre, AAIW and North Atlantic Deep Water have cooled (freshened) by 0.4° (0.07) and 0.7°C (0.11), respectively. To quantify those ACC–subtropical gyre interactions, a box inverse model surrounding the confluence is built. The model diagnoses a subduction of 16 ± 4 Sv (1 Sv = 106 m3 s-1) of newly formed SAMW and AAIW under the subtropical gyre corresponding to about half of the total subduction rate of the South Atlantic found in previous studies. Cross-frontal heat (0.06 PW) and salt (2.4 × 1012 kg s-1) gains by the ACC in the BMC contribute to the meridional poleward heat and salt fluxes across the ACC. These estimates correspond to perhaps half of the total cross-ACC poleward heat flux. The authors’ results highlight the BMC as a key region in the subtropical–ACC exchanges. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic University of East Anglia: UEA Digital Repository Antarctic Argentine The Antarctic Journal of Physical Oceanography 40 5 845 864 |
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Open Polar |
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University of East Anglia: UEA Digital Repository |
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ftuniveastangl |
language |
English |
description |
The confluence between the Brazil Current and the Malvinas Current [the Brazil–Malvinas Confluence (BMC)] in the Argentine Basin is characterized by a complicated thermohaline structure favoring the exchanges of mass, heat, and salt between the subtropical gyre and the Antarctic Circumpolar Current (ACC). Analysis of thermohaline properties of hydrographic sections in the BMC reveals strong interactions between the ACC and subtropical fronts. In the Subantarctic Front, Subantarctic Mode Water (SAMW), Antarctic Intermediate Water (AAIW), and Circumpolar Deep Water (CDW) warm (become saltier) by 0.4° (0.08), 0.3° (0.02), and 0.6°C (0.1), respectively. In the subtropical gyre, AAIW and North Atlantic Deep Water have cooled (freshened) by 0.4° (0.07) and 0.7°C (0.11), respectively. To quantify those ACC–subtropical gyre interactions, a box inverse model surrounding the confluence is built. The model diagnoses a subduction of 16 ± 4 Sv (1 Sv = 106 m3 s-1) of newly formed SAMW and AAIW under the subtropical gyre corresponding to about half of the total subduction rate of the South Atlantic found in previous studies. Cross-frontal heat (0.06 PW) and salt (2.4 × 1012 kg s-1) gains by the ACC in the BMC contribute to the meridional poleward heat and salt fluxes across the ACC. These estimates correspond to perhaps half of the total cross-ACC poleward heat flux. The authors’ results highlight the BMC as a key region in the subtropical–ACC exchanges. |
format |
Article in Journal/Newspaper |
author |
Jullion, Loic Heywood, Karen J. Naveira Garabato, Alberto C. Stevens, David P. |
spellingShingle |
Jullion, Loic Heywood, Karen J. Naveira Garabato, Alberto C. Stevens, David P. Circulation and Water Mass Modification in the Brazil–Malvinas Confluence |
author_facet |
Jullion, Loic Heywood, Karen J. Naveira Garabato, Alberto C. Stevens, David P. |
author_sort |
Jullion, Loic |
title |
Circulation and Water Mass Modification in the Brazil–Malvinas Confluence |
title_short |
Circulation and Water Mass Modification in the Brazil–Malvinas Confluence |
title_full |
Circulation and Water Mass Modification in the Brazil–Malvinas Confluence |
title_fullStr |
Circulation and Water Mass Modification in the Brazil–Malvinas Confluence |
title_full_unstemmed |
Circulation and Water Mass Modification in the Brazil–Malvinas Confluence |
title_sort |
circulation and water mass modification in the brazil–malvinas confluence |
publishDate |
2010 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/15941/ https://ueaeprints.uea.ac.uk/id/eprint/15941/1/DS_53.pdf https://doi.org/10.1175/2009JPO4174.1 |
geographic |
Antarctic Argentine The Antarctic |
geographic_facet |
Antarctic Argentine The Antarctic |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/15941/1/DS_53.pdf Jullion, Loic, Heywood, Karen J., Naveira Garabato, Alberto C. and Stevens, David P. (2010) Circulation and Water Mass Modification in the Brazil–Malvinas Confluence. Journal of Physical Oceanography, 40 (5). pp. 845-864. ISSN 0022-3670 doi:10.1175/2009JPO4174.1 |
op_doi |
https://doi.org/10.1175/2009JPO4174.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
40 |
container_issue |
5 |
container_start_page |
845 |
op_container_end_page |
864 |
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1766145227531223040 |