South Atlantic mass transports obtained from subsurface float and hydrographic data
Mean total (barotropic + baroclinie) mass transports of the oceanic top 1000 dbar are estimated for two regions of the South Atlantic between 18 degrees S and 47 degrees S. These transports are obtained by using Gravest Empirical Mode (GEM) fields calculated from historical hydrography with temperat...
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ftarchimer:oai:archimer.ifremer.fr:15391 2023-05-15T13:47:21+02:00 South Atlantic mass transports obtained from subsurface float and hydrographic data Rodrigues, Regina R. Wimbush, Mark Watts, D. Randolph Rothstein, Lewis M. Ollitrault, Michel 2010-11 application/pdf https://archimer.ifremer.fr/doc/00043/15391/12816.pdf https://archimer.ifremer.fr/doc/00043/15391/ eng eng Sears Foundation Marine Research https://archimer.ifremer.fr/doc/00043/15391/12816.pdf https://archimer.ifremer.fr/doc/00043/15391/ 2010 Sears Foundation Marine Research info:eu-repo/semantics/openAccess restricted use Journal Of Marine Research (0022-2402) (Sears Foundation Marine Research), 2010-11 , Vol. 68 , N. 6 , P. 819-850 text Publication info:eu-repo/semantics/article 2010 ftarchimer 2021-09-23T20:19:41Z Mean total (barotropic + baroclinie) mass transports of the oceanic top 1000 dbar are estimated for two regions of the South Atlantic between 18 degrees S and 47 degrees S. These transports are obtained by using Gravest Empirical Mode (GEM) fields calculated from historical hydrography with temperature and position data from quasi-isobaric subsurface floats deployed from 1992 through 2001. The float-GEM-estimated total mass transports reveal a Brazil Current with a southward flow of 20.9 Sv at 30 degrees S and 46 Sv at 35 degrees S (1 Sverdrup, Sv = 10(6) m(3) s(-1)). Two recirculation cells are identified in the southwest corner of the subtropical gyre north of 40 degrees S, one centered at 48 degrees W, 37 degrees S recirculating 28.5 Sv and another centered at 40 degrees W, 38 degrees S recirculating 13.9 Sv. The South Atlantic Current (SAC) flows eastward with 50 Sv at 30 degrees W and splits into two branches in the east, one north of 38 degrees S transporting 19 Sv and one south of 41 degrees S transporting 31 Sv. Of the 39.7 Sv of SAC transport that conies from the Malvinas Current/Antarctic Circumpolar Current (ACC) system in the western basin, only 8.7 Sv flow with the northern branch and the remaining 31 Sv flow as the southern branch out of the South Atlantic rejoining the ACC directly (20.6 Sv) or interacting with the Agulhas Current Retroflection (10.4 Sv). From the northern branch, only 4.7 Sv of Malvinas Current/ACC origin and 10.3 Sv of Brazil Current origin (a total of 15 Sv) stays in the South Atlantic forming the Benguela Current, recirculating within the subtropical gyre. The Agulhas Current Retroflection reaches westward as far as 10 E with a transport of 48 Sv. In terms of mean total transport, the cold-water route carries 4.7 Sv in the upper 1000 dbar whereas the warm-water route carries 8.5 Sv. However, considering the interaction between waters from both origins, there is a total of 19.1 Sv of waters entering the Cape Basin from the Pacific Ocean and 18.5 Sv from the Indian Ocean. Article in Journal/Newspaper Antarc* Antarctic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Indian Pacific Western Basin |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Mean total (barotropic + baroclinie) mass transports of the oceanic top 1000 dbar are estimated for two regions of the South Atlantic between 18 degrees S and 47 degrees S. These transports are obtained by using Gravest Empirical Mode (GEM) fields calculated from historical hydrography with temperature and position data from quasi-isobaric subsurface floats deployed from 1992 through 2001. The float-GEM-estimated total mass transports reveal a Brazil Current with a southward flow of 20.9 Sv at 30 degrees S and 46 Sv at 35 degrees S (1 Sverdrup, Sv = 10(6) m(3) s(-1)). Two recirculation cells are identified in the southwest corner of the subtropical gyre north of 40 degrees S, one centered at 48 degrees W, 37 degrees S recirculating 28.5 Sv and another centered at 40 degrees W, 38 degrees S recirculating 13.9 Sv. The South Atlantic Current (SAC) flows eastward with 50 Sv at 30 degrees W and splits into two branches in the east, one north of 38 degrees S transporting 19 Sv and one south of 41 degrees S transporting 31 Sv. Of the 39.7 Sv of SAC transport that conies from the Malvinas Current/Antarctic Circumpolar Current (ACC) system in the western basin, only 8.7 Sv flow with the northern branch and the remaining 31 Sv flow as the southern branch out of the South Atlantic rejoining the ACC directly (20.6 Sv) or interacting with the Agulhas Current Retroflection (10.4 Sv). From the northern branch, only 4.7 Sv of Malvinas Current/ACC origin and 10.3 Sv of Brazil Current origin (a total of 15 Sv) stays in the South Atlantic forming the Benguela Current, recirculating within the subtropical gyre. The Agulhas Current Retroflection reaches westward as far as 10 E with a transport of 48 Sv. In terms of mean total transport, the cold-water route carries 4.7 Sv in the upper 1000 dbar whereas the warm-water route carries 8.5 Sv. However, considering the interaction between waters from both origins, there is a total of 19.1 Sv of waters entering the Cape Basin from the Pacific Ocean and 18.5 Sv from the Indian Ocean. |
format |
Article in Journal/Newspaper |
author |
Rodrigues, Regina R. Wimbush, Mark Watts, D. Randolph Rothstein, Lewis M. Ollitrault, Michel |
spellingShingle |
Rodrigues, Regina R. Wimbush, Mark Watts, D. Randolph Rothstein, Lewis M. Ollitrault, Michel South Atlantic mass transports obtained from subsurface float and hydrographic data |
author_facet |
Rodrigues, Regina R. Wimbush, Mark Watts, D. Randolph Rothstein, Lewis M. Ollitrault, Michel |
author_sort |
Rodrigues, Regina R. |
title |
South Atlantic mass transports obtained from subsurface float and hydrographic data |
title_short |
South Atlantic mass transports obtained from subsurface float and hydrographic data |
title_full |
South Atlantic mass transports obtained from subsurface float and hydrographic data |
title_fullStr |
South Atlantic mass transports obtained from subsurface float and hydrographic data |
title_full_unstemmed |
South Atlantic mass transports obtained from subsurface float and hydrographic data |
title_sort |
south atlantic mass transports obtained from subsurface float and hydrographic data |
publisher |
Sears Foundation Marine Research |
publishDate |
2010 |
url |
https://archimer.ifremer.fr/doc/00043/15391/12816.pdf https://archimer.ifremer.fr/doc/00043/15391/ |
geographic |
Antarctic Indian Pacific Western Basin |
geographic_facet |
Antarctic Indian Pacific Western Basin |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Journal Of Marine Research (0022-2402) (Sears Foundation Marine Research), 2010-11 , Vol. 68 , N. 6 , P. 819-850 |
op_relation |
https://archimer.ifremer.fr/doc/00043/15391/12816.pdf https://archimer.ifremer.fr/doc/00043/15391/ |
op_rights |
2010 Sears Foundation Marine Research info:eu-repo/semantics/openAccess restricted use |
_version_ |
1766246959484502016 |