The water masses along the western boundary of the south and equatorial Atlantic.
International audience A quasi-meridional hydrographic section located offshore from South America from 50°S to 10°N, and three shorter transverse lines to the continental slope, are used for a descriptive study of the water masses along the western boundary of the South and Equatorial Atlantic. At...
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ftccsdartic:oai:HAL:hal-00274724v1 2023-05-15T17:25:23+02:00 The water masses along the western boundary of the south and equatorial Atlantic. Mémery, Laurent Arhan, Michel Álvarez-Salgado, X. A. Messias, Marie-José Mercier, Herlé Castro, C. G. Rios, Aida F. Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 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) Instituto de Investigaciones Marinas Consejo Superior de Investigaciones Científicas Madrid (CSIC) 2000-10 https://hal.archives-ouvertes.fr/hal-00274724 https://doi.org/10.1016/S0079-6611(00)00032-X en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0079-6611(00)00032-X hal-00274724 https://hal.archives-ouvertes.fr/hal-00274724 doi:10.1016/S0079-6611(00)00032-X ISSN: 0079-6611 Progress in Oceanography https://hal.archives-ouvertes.fr/hal-00274724 Progress in Oceanography, Elsevier, 2000, 47 (1), pp.69-98. ⟨10.1016/S0079-6611(00)00032-X⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2000 ftccsdartic https://doi.org/10.1016/S0079-6611(00)00032-X 2021-10-17T02:10:28Z International audience A quasi-meridional hydrographic section located offshore from South America from 50°S to 10°N, and three shorter transverse lines to the continental slope, are used for a descriptive study of the water masses along the western boundary of the South and Equatorial Atlantic. At the upper and intermediate levels, the tracer analysis provides geographical limits of the wind-driven circulation regimes, and a comparison of the tracer values at the continental slope and along the meridional section shows where the boundary currents originate. At depths shallower than about 200 m, the subdivision of the subtropical gyre into two cells separated by the Subtropical Countercurrent near 28°S, that was pointed out in a previous study, is corroborated. South of this front, a warm variety (not, vert, similar18°C) of Subtropical Mode Water in the inner recirculation of the Brazil Current appears, despite its limited extent, as a southern counterpart of the North Atlantic 18°C water. At the deep levels, the Upper Circumpolar Water and Upper North Atlantic Deep Water enter the South Atlantic in a significantly overlapping density range. The ensuing lateral encounter of both water masses occurs at 26°S near the western boundary, where most of the boundary flow of the latter water is stopped and deflected seaward by the base of the subtropical gyre. Other tracer anomalies signal significant eastward escapes of North Atlantic Deep Water: within two jets at about two degrees of latitude on either side of the equator, in another narrow current at 10°S, and at 34°S. The latter latitude marks the confluence, and eastward deflection, of the opposite boundary currents of Lower North Atlantic Deep Water and Lower Circumpolar Water. Near the bottom of the Argentine Basin, the Weddell Sea Deep Water that flows westward north of the Zapiola Ridge is more recently ventilated than the water carried by the boundary current near the Falkland Escarpment. While a part of it flows anticyclonically around the ridge, another ... Article in Journal/Newspaper North Atlantic Deep Water North Atlantic Weddell Sea Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Weddell Sea Weddell Argentine Zapiola ENVELOPE(-63.567,-63.567,-65.083,-65.083) Falkland Escarpment ENVELOPE(-45.000,-45.000,-50.000,-50.000) Progress in Oceanography 47 1 69 98 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
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 Mémery, Laurent Arhan, Michel Álvarez-Salgado, X. A. Messias, Marie-José Mercier, Herlé Castro, C. G. Rios, Aida F. The water masses along the western boundary of the south and equatorial Atlantic. |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience A quasi-meridional hydrographic section located offshore from South America from 50°S to 10°N, and three shorter transverse lines to the continental slope, are used for a descriptive study of the water masses along the western boundary of the South and Equatorial Atlantic. At the upper and intermediate levels, the tracer analysis provides geographical limits of the wind-driven circulation regimes, and a comparison of the tracer values at the continental slope and along the meridional section shows where the boundary currents originate. At depths shallower than about 200 m, the subdivision of the subtropical gyre into two cells separated by the Subtropical Countercurrent near 28°S, that was pointed out in a previous study, is corroborated. South of this front, a warm variety (not, vert, similar18°C) of Subtropical Mode Water in the inner recirculation of the Brazil Current appears, despite its limited extent, as a southern counterpart of the North Atlantic 18°C water. At the deep levels, the Upper Circumpolar Water and Upper North Atlantic Deep Water enter the South Atlantic in a significantly overlapping density range. The ensuing lateral encounter of both water masses occurs at 26°S near the western boundary, where most of the boundary flow of the latter water is stopped and deflected seaward by the base of the subtropical gyre. Other tracer anomalies signal significant eastward escapes of North Atlantic Deep Water: within two jets at about two degrees of latitude on either side of the equator, in another narrow current at 10°S, and at 34°S. The latter latitude marks the confluence, and eastward deflection, of the opposite boundary currents of Lower North Atlantic Deep Water and Lower Circumpolar Water. Near the bottom of the Argentine Basin, the Weddell Sea Deep Water that flows westward north of the Zapiola Ridge is more recently ventilated than the water carried by the boundary current near the Falkland Escarpment. While a part of it flows anticyclonically around the ridge, another ... |
author2 |
Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 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) Instituto de Investigaciones Marinas Consejo Superior de Investigaciones Científicas Madrid (CSIC) |
format |
Article in Journal/Newspaper |
author |
Mémery, Laurent Arhan, Michel Álvarez-Salgado, X. A. Messias, Marie-José Mercier, Herlé Castro, C. G. Rios, Aida F. |
author_facet |
Mémery, Laurent Arhan, Michel Álvarez-Salgado, X. A. Messias, Marie-José Mercier, Herlé Castro, C. G. Rios, Aida F. |
author_sort |
Mémery, Laurent |
title |
The water masses along the western boundary of the south and equatorial Atlantic. |
title_short |
The water masses along the western boundary of the south and equatorial Atlantic. |
title_full |
The water masses along the western boundary of the south and equatorial Atlantic. |
title_fullStr |
The water masses along the western boundary of the south and equatorial Atlantic. |
title_full_unstemmed |
The water masses along the western boundary of the south and equatorial Atlantic. |
title_sort |
water masses along the western boundary of the south and equatorial atlantic. |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.archives-ouvertes.fr/hal-00274724 https://doi.org/10.1016/S0079-6611(00)00032-X |
long_lat |
ENVELOPE(-63.567,-63.567,-65.083,-65.083) ENVELOPE(-45.000,-45.000,-50.000,-50.000) |
geographic |
Weddell Sea Weddell Argentine Zapiola Falkland Escarpment |
geographic_facet |
Weddell Sea Weddell Argentine Zapiola Falkland Escarpment |
genre |
North Atlantic Deep Water North Atlantic Weddell Sea |
genre_facet |
North Atlantic Deep Water North Atlantic Weddell Sea |
op_source |
ISSN: 0079-6611 Progress in Oceanography https://hal.archives-ouvertes.fr/hal-00274724 Progress in Oceanography, Elsevier, 2000, 47 (1), pp.69-98. ⟨10.1016/S0079-6611(00)00032-X⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0079-6611(00)00032-X hal-00274724 https://hal.archives-ouvertes.fr/hal-00274724 doi:10.1016/S0079-6611(00)00032-X |
op_doi |
https://doi.org/10.1016/S0079-6611(00)00032-X |
container_title |
Progress in Oceanography |
container_volume |
47 |
container_issue |
1 |
container_start_page |
69 |
op_container_end_page |
98 |
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1766116799756107776 |