Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic.
International audience This study combines float data from different projects collected between 1991 and 2003 in the South Atlantic to describe the flow of Antarctic Intermediate Water (AAIW). Velocity space–time averages are calculated for various grid resolutions and with cells deformed to match t...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal.science/hal-00308724 https://doi.org/10.1016/j.dsr2.2004.12.006 |
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ftunivbrest:oai:HAL:hal-00308724v1 2024-02-11T09:57:33+01:00 Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic. Núñez-Riboni, Ismael Boebel, Olaf Ollitrault, Michel You, Yuzhu L. Richardson, Philip Davis, Russ Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association 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) University of Sydney Institute of Marine Science (USIMS) The University of Sydney Department of Physical Oceanography (WHOI) Woods Hole Oceanographic Institution (WHOI) Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) 2005-02 https://hal.science/hal-00308724 https://doi.org/10.1016/j.dsr2.2004.12.006 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr2.2004.12.006 hal-00308724 https://hal.science/hal-00308724 doi:10.1016/j.dsr2.2004.12.006 ISSN: 0967-0645 Deep Sea Research Part II: Topical Studies in Oceanography https://hal.science/hal-00308724 Deep Sea Research Part II: Topical Studies in Oceanography, 2005, 52 (3-4), pp.545-564. ⟨10.1016/j.dsr2.2004.12.006⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2005 ftunivbrest https://doi.org/10.1016/j.dsr2.2004.12.006 2024-01-16T23:38:05Z International audience This study combines float data from different projects collected between 1991 and 2003 in the South Atlantic to describe the flow of Antarctic Intermediate Water (AAIW). Velocity space–time averages are calculated for various grid resolutions and with cells deformed to match the bathymetry, f/H or f/h (with H being the water depth and h being the thickness of the AAIW layer). When judged by the degree of alignment between respective isolines and the resulting average velocity fields, the best grid is based on a nominal cell size of 3° (latitude) by 4° (longitude) with cell shapes deformed according to f/h. Using this grid, objectively estimated mean currents (and their associated errors), as well as meridional and zonal volume transports are estimated. Results show an anticyclonic Subtropical Gyre centred near 36°S and spanning from 23±1°S to 46±1°S. The South Atlantic Current meanders from 33°S to 46°S and shows a mean speed of 9.6±7.8 cm s−1 (8.5±3.5 Sv; 1 Sv=1×106 m3 s−1). The northern branch of the Subtropical Gyre is located between 22°S and 32°S and flows westward with a mean speed of 4.7±3.3 cm s−1 (9.3±3.4 Sv). Evidence of a cyclonic Tropical Gyre divided in two sub-cells is visible on the stream function. Article in Journal/Newspaper Antarc* Antarctic Université de Bretagne Occidentale: HAL Antarctic Deep Sea Research Part II: Topical Studies in Oceanography 52 3-4 545 564 |
institution |
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 Núñez-Riboni, Ismael Boebel, Olaf Ollitrault, Michel You, Yuzhu L. Richardson, Philip Davis, Russ Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic. |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience This study combines float data from different projects collected between 1991 and 2003 in the South Atlantic to describe the flow of Antarctic Intermediate Water (AAIW). Velocity space–time averages are calculated for various grid resolutions and with cells deformed to match the bathymetry, f/H or f/h (with H being the water depth and h being the thickness of the AAIW layer). When judged by the degree of alignment between respective isolines and the resulting average velocity fields, the best grid is based on a nominal cell size of 3° (latitude) by 4° (longitude) with cell shapes deformed according to f/h. Using this grid, objectively estimated mean currents (and their associated errors), as well as meridional and zonal volume transports are estimated. Results show an anticyclonic Subtropical Gyre centred near 36°S and spanning from 23±1°S to 46±1°S. The South Atlantic Current meanders from 33°S to 46°S and shows a mean speed of 9.6±7.8 cm s−1 (8.5±3.5 Sv; 1 Sv=1×106 m3 s−1). The northern branch of the Subtropical Gyre is located between 22°S and 32°S and flows westward with a mean speed of 4.7±3.3 cm s−1 (9.3±3.4 Sv). Evidence of a cyclonic Tropical Gyre divided in two sub-cells is visible on the stream function. |
author2 |
Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association 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) University of Sydney Institute of Marine Science (USIMS) The University of Sydney Department of Physical Oceanography (WHOI) Woods Hole Oceanographic Institution (WHOI) Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) |
format |
Article in Journal/Newspaper |
author |
Núñez-Riboni, Ismael Boebel, Olaf Ollitrault, Michel You, Yuzhu L. Richardson, Philip Davis, Russ |
author_facet |
Núñez-Riboni, Ismael Boebel, Olaf Ollitrault, Michel You, Yuzhu L. Richardson, Philip Davis, Russ |
author_sort |
Núñez-Riboni, Ismael |
title |
Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic. |
title_short |
Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic. |
title_full |
Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic. |
title_fullStr |
Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic. |
title_full_unstemmed |
Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic. |
title_sort |
lagrangian circulation of antarctic intermediate water in the subtropical south atlantic. |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00308724 https://doi.org/10.1016/j.dsr2.2004.12.006 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0967-0645 Deep Sea Research Part II: Topical Studies in Oceanography https://hal.science/hal-00308724 Deep Sea Research Part II: Topical Studies in Oceanography, 2005, 52 (3-4), pp.545-564. ⟨10.1016/j.dsr2.2004.12.006⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr2.2004.12.006 hal-00308724 https://hal.science/hal-00308724 doi:10.1016/j.dsr2.2004.12.006 |
op_doi |
https://doi.org/10.1016/j.dsr2.2004.12.006 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
52 |
container_issue |
3-4 |
container_start_page |
545 |
op_container_end_page |
564 |
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1790593084320382976 |