Southern Ocean Thermocline Ventilation
International audience An approximate mass (volume) budget in the surface layer of the Southern Ocean is used to investigate the intensity and regional variability of the ventilation process, discussed here in terms of subduction and upwelling. Ventilation resulting from Ekman pumping is estimated f...
Published in: | Journal of Physical Oceanography |
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Main Authors: | , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2009
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-03059222 https://hal.archives-ouvertes.fr/hal-03059222/document https://hal.archives-ouvertes.fr/hal-03059222/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Southern%20Ocean%20Thermocline%20Ventilation.pdf https://doi.org/10.1175/2009jpo4291.1 |
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ftccsdartic:oai:HAL:hal-03059222v1 |
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institution |
Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[PHYS]Physics [physics] [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
spellingShingle |
[PHYS]Physics [physics] [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] Sallée, Jean-Baptiste Speer, Kevin Rintoul, Steve Wijffels, S. Southern Ocean Thermocline Ventilation |
topic_facet |
[PHYS]Physics [physics] [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
description |
International audience An approximate mass (volume) budget in the surface layer of the Southern Ocean is used to investigate the intensity and regional variability of the ventilation process, discussed here in terms of subduction and upwelling. Ventilation resulting from Ekman pumping is estimated from satellite winds, the geostrophic mean component is assessed from a climatology strengthened with Argo data, and the eddy-induced advection is included via the parameterization of Gent and McWilliams, together with eddy mixing estimates. All three components contribute significantly to ventilation. Finally, the seasonal cycle of the upper ocean is resolved using Argo data. The circumpolar-averaged circulation shows an upwelling in the Antarctic Intermediate Water (AAIW) density classes, which is carried north into a zone of dense Subantarctic Mode Water (SAMW) subduction. Although no consistent net production is found in the light SAMW density classes, a large subduction of Subtropical Mode Water (STMW) is observed. The STMW area is fed by convergence of a southward and a northward residual meridional circulation. The eddy-induced contribution is important for the water mass transport in the vicinity of the Antartic Circumpolar Current. It balances the horizontal northward Ekman transport as well as the vertical Ekman pumping. While the circumpolar-averaged upper cell structure is consistent with the average surface fluxes, it hides strong longitudinal regional variations and does not represent any local regime. Subduction shows strong regional variability with bathymetrically constrained hotspots of large subduction. These hotspots are consistent with the interior potential vorticity structure and circulation in the thermocline. Pools of SAMW and AAIW of different densities are found along the circumpolar belt in association with the regional pattern of subduction and interior circulation. |
author2 |
Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) Florida State University Tallahassee (FSU) |
format |
Article in Journal/Newspaper |
author |
Sallée, Jean-Baptiste Speer, Kevin Rintoul, Steve Wijffels, S. |
author_facet |
Sallée, Jean-Baptiste Speer, Kevin Rintoul, Steve Wijffels, S. |
author_sort |
Sallée, Jean-Baptiste |
title |
Southern Ocean Thermocline Ventilation |
title_short |
Southern Ocean Thermocline Ventilation |
title_full |
Southern Ocean Thermocline Ventilation |
title_fullStr |
Southern Ocean Thermocline Ventilation |
title_full_unstemmed |
Southern Ocean Thermocline Ventilation |
title_sort |
southern ocean thermocline ventilation |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.archives-ouvertes.fr/hal-03059222 https://hal.archives-ouvertes.fr/hal-03059222/document https://hal.archives-ouvertes.fr/hal-03059222/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Southern%20Ocean%20Thermocline%20Ventilation.pdf https://doi.org/10.1175/2009jpo4291.1 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic antartic* Southern Ocean |
genre_facet |
Antarc* Antarctic antartic* Southern Ocean |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.archives-ouvertes.fr/hal-03059222 Journal of Physical Oceanography, American Meteorological Society, 2009, 40 (3), pp.509 - 529. ⟨10.1175/2009jpo4291.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/2009jpo4291.1 hal-03059222 https://hal.archives-ouvertes.fr/hal-03059222 https://hal.archives-ouvertes.fr/hal-03059222/document https://hal.archives-ouvertes.fr/hal-03059222/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Southern%20Ocean%20Thermocline%20Ventilation.pdf doi:10.1175/2009jpo4291.1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/2009jpo4291.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
40 |
container_issue |
3 |
container_start_page |
509 |
op_container_end_page |
529 |
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1766260995829792768 |
spelling |
ftccsdartic:oai:HAL:hal-03059222v1 2023-05-15T13:54:51+02:00 Southern Ocean Thermocline Ventilation Sallée, Jean-Baptiste Speer, Kevin Rintoul, Steve Wijffels, S. Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) Florida State University Tallahassee (FSU) 2009-09-22 https://hal.archives-ouvertes.fr/hal-03059222 https://hal.archives-ouvertes.fr/hal-03059222/document https://hal.archives-ouvertes.fr/hal-03059222/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Southern%20Ocean%20Thermocline%20Ventilation.pdf https://doi.org/10.1175/2009jpo4291.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/2009jpo4291.1 hal-03059222 https://hal.archives-ouvertes.fr/hal-03059222 https://hal.archives-ouvertes.fr/hal-03059222/document https://hal.archives-ouvertes.fr/hal-03059222/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Southern%20Ocean%20Thermocline%20Ventilation.pdf doi:10.1175/2009jpo4291.1 info:eu-repo/semantics/OpenAccess ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.archives-ouvertes.fr/hal-03059222 Journal of Physical Oceanography, American Meteorological Society, 2009, 40 (3), pp.509 - 529. ⟨10.1175/2009jpo4291.1⟩ [PHYS]Physics [physics] [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2009 ftccsdartic https://doi.org/10.1175/2009jpo4291.1 2021-10-24T00:13:28Z International audience An approximate mass (volume) budget in the surface layer of the Southern Ocean is used to investigate the intensity and regional variability of the ventilation process, discussed here in terms of subduction and upwelling. Ventilation resulting from Ekman pumping is estimated from satellite winds, the geostrophic mean component is assessed from a climatology strengthened with Argo data, and the eddy-induced advection is included via the parameterization of Gent and McWilliams, together with eddy mixing estimates. All three components contribute significantly to ventilation. Finally, the seasonal cycle of the upper ocean is resolved using Argo data. The circumpolar-averaged circulation shows an upwelling in the Antarctic Intermediate Water (AAIW) density classes, which is carried north into a zone of dense Subantarctic Mode Water (SAMW) subduction. Although no consistent net production is found in the light SAMW density classes, a large subduction of Subtropical Mode Water (STMW) is observed. The STMW area is fed by convergence of a southward and a northward residual meridional circulation. The eddy-induced contribution is important for the water mass transport in the vicinity of the Antartic Circumpolar Current. It balances the horizontal northward Ekman transport as well as the vertical Ekman pumping. While the circumpolar-averaged upper cell structure is consistent with the average surface fluxes, it hides strong longitudinal regional variations and does not represent any local regime. Subduction shows strong regional variability with bathymetrically constrained hotspots of large subduction. These hotspots are consistent with the interior potential vorticity structure and circulation in the thermocline. Pools of SAMW and AAIW of different densities are found along the circumpolar belt in association with the regional pattern of subduction and interior circulation. Article in Journal/Newspaper Antarc* Antarctic antartic* Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Southern Ocean The Antarctic Journal of Physical Oceanography 40 3 509 529 |