A direct determination of the World Ocean barotropic circulation
International audience The time-mean Argo float displacements and the World Ocean Atlas 2009 temperature–salinity climatology are used to obtain the total, top to bottom, mass transports. Outside of an equatorial band, the total transports are the sum of the vertical integrals of geostrophic- and wi...
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ftinsu:oai:HAL:hal-04200753v1 2024-04-14T08:04:38+00:00 A direct determination of the World Ocean barotropic circulation de Verdiere, Alain Colin Ollitrault, Michel Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2016-01 https://hal.science/hal-04200753 https://hal.science/hal-04200753/document https://hal.science/hal-04200753/file/phoc-jpo-d-15-0046.1.pdf https://doi.org/10.1175/JPO-D-15-0046.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-15-0046.1 hal-04200753 https://hal.science/hal-04200753 https://hal.science/hal-04200753/document https://hal.science/hal-04200753/file/phoc-jpo-d-15-0046.1.pdf doi:10.1175/JPO-D-15-0046.1 info:eu-repo/semantics/OpenAccess ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-04200753 Journal of Physical Oceanography, 2016, 46 (1), pp.255-273. ⟨10.1175/JPO-D-15-0046.1⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2016 ftinsu https://doi.org/10.1175/JPO-D-15-0046.1 2024-03-21T17:06:29Z International audience The time-mean Argo float displacements and the World Ocean Atlas 2009 temperature–salinity climatology are used to obtain the total, top to bottom, mass transports. Outside of an equatorial band, the total transports are the sum of the vertical integrals of geostrophic- and wind-driven Ekman currents. However, these transports are generally divergent, and to obtain a mass conserving circulation, a Poisson equation is solved for the streamfunction with Dirichlet boundary conditions at solid boundaries. The value of the streamfunction on islands is also part of the unknowns. This study presents and discusses an energetic circulation in three basins: the North Atlantic, the North Pacific, and the Southern Ocean. This global method leads to new estimations of the time-mean western Eulerian boundary current transports maxima of 97 Sverdrups (Sv; 1 Sv ≡ 106 m3 s−1) at 60°W for the Gulf Stream, 84 Sv at 157°E for the Kuroshio, 80 Sv for the Agulhas Current between 32° and 36°S, and finally 175 Sv for the Antarctic Circumpolar Current at Drake Passage. Although the large-scale structure and boundary of the interior gyres is well predicted by the Sverdrup relation, the transports derived from the wind stress curl are lower than the observed transports in the interior by roughly a factor of 2, suggesting an important contribution of the bottom torques. With additional Argo displacement data, the errors caused by the presence of remaining transient terms at the 1000-db reference level will continue to decrease, allowing this method to produce increasingly accurate results in the future. Article in Journal/Newspaper Antarc* Antarctic Drake Passage North Atlantic Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Antarctic Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Drake Passage Pacific Southern Ocean The Antarctic Journal of Physical Oceanography 46 1 255 273 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] de Verdiere, Alain Colin Ollitrault, Michel A direct determination of the World Ocean barotropic circulation |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience The time-mean Argo float displacements and the World Ocean Atlas 2009 temperature–salinity climatology are used to obtain the total, top to bottom, mass transports. Outside of an equatorial band, the total transports are the sum of the vertical integrals of geostrophic- and wind-driven Ekman currents. However, these transports are generally divergent, and to obtain a mass conserving circulation, a Poisson equation is solved for the streamfunction with Dirichlet boundary conditions at solid boundaries. The value of the streamfunction on islands is also part of the unknowns. This study presents and discusses an energetic circulation in three basins: the North Atlantic, the North Pacific, and the Southern Ocean. This global method leads to new estimations of the time-mean western Eulerian boundary current transports maxima of 97 Sverdrups (Sv; 1 Sv ≡ 106 m3 s−1) at 60°W for the Gulf Stream, 84 Sv at 157°E for the Kuroshio, 80 Sv for the Agulhas Current between 32° and 36°S, and finally 175 Sv for the Antarctic Circumpolar Current at Drake Passage. Although the large-scale structure and boundary of the interior gyres is well predicted by the Sverdrup relation, the transports derived from the wind stress curl are lower than the observed transports in the interior by roughly a factor of 2, suggesting an important contribution of the bottom torques. With additional Argo displacement data, the errors caused by the presence of remaining transient terms at the 1000-db reference level will continue to decrease, allowing this method to produce increasingly accurate results in the future. |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
de Verdiere, Alain Colin Ollitrault, Michel |
author_facet |
de Verdiere, Alain Colin Ollitrault, Michel |
author_sort |
de Verdiere, Alain Colin |
title |
A direct determination of the World Ocean barotropic circulation |
title_short |
A direct determination of the World Ocean barotropic circulation |
title_full |
A direct determination of the World Ocean barotropic circulation |
title_fullStr |
A direct determination of the World Ocean barotropic circulation |
title_full_unstemmed |
A direct determination of the World Ocean barotropic circulation |
title_sort |
direct determination of the world ocean barotropic circulation |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-04200753 https://hal.science/hal-04200753/document https://hal.science/hal-04200753/file/phoc-jpo-d-15-0046.1.pdf https://doi.org/10.1175/JPO-D-15-0046.1 |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Antarctic Curl Drake Passage Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Curl Drake Passage Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Drake Passage North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage North Atlantic Southern Ocean |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-04200753 Journal of Physical Oceanography, 2016, 46 (1), pp.255-273. ⟨10.1175/JPO-D-15-0046.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-15-0046.1 hal-04200753 https://hal.science/hal-04200753 https://hal.science/hal-04200753/document https://hal.science/hal-04200753/file/phoc-jpo-d-15-0046.1.pdf doi:10.1175/JPO-D-15-0046.1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JPO-D-15-0046.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
46 |
container_issue |
1 |
container_start_page |
255 |
op_container_end_page |
273 |
_version_ |
1796301293819527168 |