Heat budget of the surface mixed layer south of Africa
ARGO hydrographic profiles, two hydrographic transects and satellite measurements of air-sea exchange parameters were used to characterize the properties and seasonal heat budget variations of the Surface Mixed Layer (SML) south of Africa. The analysis distinguishes the Subtropical domain (STZ) and...
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ftarchimer:oai:archimer.ifremer.fr:15953 2023-05-15T13:47:21+02:00 Heat budget of the surface mixed layer south of Africa Faure, Vincent Arhan, Michel Speich, Sabrina Gladyshev, Sergey 2011-10 application/pdf https://archimer.ifremer.fr/doc/00048/15953/15833.pdf https://doi.org/10.1007/s10236-011-0444-1 https://archimer.ifremer.fr/doc/00048/15953/ eng eng Springer Heidelberg https://archimer.ifremer.fr/doc/00048/15953/15833.pdf doi:10.1007/s10236-011-0444-1 https://archimer.ifremer.fr/doc/00048/15953/ Springer-Verlag 2011 info:eu-repo/semantics/openAccess restricted use Ocean Dynamics (1616-7341) (Springer Heidelberg), 2011-10 , Vol. 61 , N. 10 , P. 1441-1458 Ocean surface mixed layer Heat budget Southern Ocean Agulhas Current retroflection text Publication info:eu-repo/semantics/article 2011 ftarchimer https://doi.org/10.1007/s10236-011-0444-1 2021-09-23T20:20:00Z ARGO hydrographic profiles, two hydrographic transects and satellite measurements of air-sea exchange parameters were used to characterize the properties and seasonal heat budget variations of the Surface Mixed Layer (SML) south of Africa. The analysis distinguishes the Subtropical domain (STZ) and the Subantarctic Zone (SAZ), Polar Frontal Zone (PFZ) and Antarctic Zone (AZ) of the Antarctic Circumpolar Current. While no Subantarctic Mode Water forms in that region, occurrences of deep SML (up to similar to 450 m) are observed in the SAZ in anticyclones detached from the Agulhas Current retroflection or Agulhas Return Current. These are present latitudinally throughout the SAZ, but preferentially at longitudes 10-20A degrees E where, according to previous results, the Subtropical Front is interrupted. Likely owing to this exchange window and to transfers at the Subantarctic Front also enhanced by the anticyclones, the SAZ shows a wide range of properties largely encroaching upon those of the neighbouring domains. Heat budget computations in each zone reveal significant meridional changes of regime. While air-sea heat fluxes dictate the heat budget seasonal variability everywhere, heat is mostly brought through lateral geostrophic advection by the Agulhas Current in the STZ, through lateral diffusion in the SAZ and through air-sea fluxes in the PFZ and AZ. The cooling contributions are by Ekman advection everywhere, lateral diffusion in the STZ (also favoured by the similar to 10A degrees breach in the Subtropical Front) and geostrophic advection in the SAZ. The latter likely reflects an eastward draining of water warmed through mixing of the subtropical eddies. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Southern Ocean The Antarctic Ocean Dynamics 61 10 1441 1458 |
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 |
topic |
Ocean surface mixed layer Heat budget Southern Ocean Agulhas Current retroflection |
spellingShingle |
Ocean surface mixed layer Heat budget Southern Ocean Agulhas Current retroflection Faure, Vincent Arhan, Michel Speich, Sabrina Gladyshev, Sergey Heat budget of the surface mixed layer south of Africa |
topic_facet |
Ocean surface mixed layer Heat budget Southern Ocean Agulhas Current retroflection |
description |
ARGO hydrographic profiles, two hydrographic transects and satellite measurements of air-sea exchange parameters were used to characterize the properties and seasonal heat budget variations of the Surface Mixed Layer (SML) south of Africa. The analysis distinguishes the Subtropical domain (STZ) and the Subantarctic Zone (SAZ), Polar Frontal Zone (PFZ) and Antarctic Zone (AZ) of the Antarctic Circumpolar Current. While no Subantarctic Mode Water forms in that region, occurrences of deep SML (up to similar to 450 m) are observed in the SAZ in anticyclones detached from the Agulhas Current retroflection or Agulhas Return Current. These are present latitudinally throughout the SAZ, but preferentially at longitudes 10-20A degrees E where, according to previous results, the Subtropical Front is interrupted. Likely owing to this exchange window and to transfers at the Subantarctic Front also enhanced by the anticyclones, the SAZ shows a wide range of properties largely encroaching upon those of the neighbouring domains. Heat budget computations in each zone reveal significant meridional changes of regime. While air-sea heat fluxes dictate the heat budget seasonal variability everywhere, heat is mostly brought through lateral geostrophic advection by the Agulhas Current in the STZ, through lateral diffusion in the SAZ and through air-sea fluxes in the PFZ and AZ. The cooling contributions are by Ekman advection everywhere, lateral diffusion in the STZ (also favoured by the similar to 10A degrees breach in the Subtropical Front) and geostrophic advection in the SAZ. The latter likely reflects an eastward draining of water warmed through mixing of the subtropical eddies. |
format |
Article in Journal/Newspaper |
author |
Faure, Vincent Arhan, Michel Speich, Sabrina Gladyshev, Sergey |
author_facet |
Faure, Vincent Arhan, Michel Speich, Sabrina Gladyshev, Sergey |
author_sort |
Faure, Vincent |
title |
Heat budget of the surface mixed layer south of Africa |
title_short |
Heat budget of the surface mixed layer south of Africa |
title_full |
Heat budget of the surface mixed layer south of Africa |
title_fullStr |
Heat budget of the surface mixed layer south of Africa |
title_full_unstemmed |
Heat budget of the surface mixed layer south of Africa |
title_sort |
heat budget of the surface mixed layer south of africa |
publisher |
Springer Heidelberg |
publishDate |
2011 |
url |
https://archimer.ifremer.fr/doc/00048/15953/15833.pdf https://doi.org/10.1007/s10236-011-0444-1 https://archimer.ifremer.fr/doc/00048/15953/ |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Ocean Dynamics (1616-7341) (Springer Heidelberg), 2011-10 , Vol. 61 , N. 10 , P. 1441-1458 |
op_relation |
https://archimer.ifremer.fr/doc/00048/15953/15833.pdf doi:10.1007/s10236-011-0444-1 https://archimer.ifremer.fr/doc/00048/15953/ |
op_rights |
Springer-Verlag 2011 info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1007/s10236-011-0444-1 |
container_title |
Ocean Dynamics |
container_volume |
61 |
container_issue |
10 |
container_start_page |
1441 |
op_container_end_page |
1458 |
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1766246959816900608 |