Eddy heat diffusion and Subantarctic Mode Water formation
International audience Subantarctic mode waters (SAMW) form in the deep winter mixed layers occuring north of the Subantarctic Front (SAF). The recent increase of hydrographic and surface drifter data in the Southern Ocean allows a better spatial representation of the distinct regions of SAMW format...
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ftsorbonneuniv:oai:HAL:hal-00282593v1 2024-09-15T18:37:03+00:00 Eddy heat diffusion and Subantarctic Mode Water formation Sallée, J.B. Morrow, R. Speer, K. Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Department of Oceanography Florida State University Tallahassee (FSU) 2008 https://hal.science/hal-00282593 https://hal.science/hal-00282593/document https://hal.science/hal-00282593/file/2007GL032827.pdf https://doi.org/10.1029/2007GL032827 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2007GL032827 hal-00282593 https://hal.science/hal-00282593 https://hal.science/hal-00282593/document https://hal.science/hal-00282593/file/2007GL032827.pdf doi:10.1029/2007GL032827 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00282593 Geophysical Research Letters, 2008, 35, pp.L05607. ⟨10.1029/2007GL032827⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2008 ftsorbonneuniv https://doi.org/10.1029/2007GL032827 2024-07-25T23:47:55Z International audience Subantarctic mode waters (SAMW) form in the deep winter mixed layers occuring north of the Subantarctic Front (SAF). The recent increase of hydrographic and surface drifter data in the Southern Ocean allows a better spatial representation of the distinct regions of SAMW formation. This study focuses on the thermodynamical processes acting on the winter mixed layer heat budget. Eddy heat diffusion play a substantial role in the local heat balance, whereas its action vanishes with large-scale averaging. South of the western boundary currents and north of the SAF, the eddy heating plays an important role in specific regions, counterbalancing the cooling of the mixed layer by Ekman advection and air-sea fluxes. Specifically, the eddy diffusion term reduces the tendency for mixed layer destabilisation north of the SAF in the Western Indian Ocean downstream of the Agulhas Retroflection and in the Western Pacific downstream of Campbell Plateau. This role for mixed layer eddy fluxes emphasizes a large-scale control of mixed layer properties by topography and mesoscale processes in the Southern Ocean. Article in Journal/Newspaper Southern Ocean HAL Sorbonne Université Geophysical Research Letters 35 5 |
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Open Polar |
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HAL Sorbonne Université |
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ftsorbonneuniv |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Sallée, J.B. Morrow, R. Speer, K. Eddy heat diffusion and Subantarctic Mode Water formation |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Subantarctic mode waters (SAMW) form in the deep winter mixed layers occuring north of the Subantarctic Front (SAF). The recent increase of hydrographic and surface drifter data in the Southern Ocean allows a better spatial representation of the distinct regions of SAMW formation. This study focuses on the thermodynamical processes acting on the winter mixed layer heat budget. Eddy heat diffusion play a substantial role in the local heat balance, whereas its action vanishes with large-scale averaging. South of the western boundary currents and north of the SAF, the eddy heating plays an important role in specific regions, counterbalancing the cooling of the mixed layer by Ekman advection and air-sea fluxes. Specifically, the eddy diffusion term reduces the tendency for mixed layer destabilisation north of the SAF in the Western Indian Ocean downstream of the Agulhas Retroflection and in the Western Pacific downstream of Campbell Plateau. This role for mixed layer eddy fluxes emphasizes a large-scale control of mixed layer properties by topography and mesoscale processes in the Southern Ocean. |
author2 |
Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Department of Oceanography Florida State University Tallahassee (FSU) |
format |
Article in Journal/Newspaper |
author |
Sallée, J.B. Morrow, R. Speer, K. |
author_facet |
Sallée, J.B. Morrow, R. Speer, K. |
author_sort |
Sallée, J.B. |
title |
Eddy heat diffusion and Subantarctic Mode Water formation |
title_short |
Eddy heat diffusion and Subantarctic Mode Water formation |
title_full |
Eddy heat diffusion and Subantarctic Mode Water formation |
title_fullStr |
Eddy heat diffusion and Subantarctic Mode Water formation |
title_full_unstemmed |
Eddy heat diffusion and Subantarctic Mode Water formation |
title_sort |
eddy heat diffusion and subantarctic mode water formation |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00282593 https://hal.science/hal-00282593/document https://hal.science/hal-00282593/file/2007GL032827.pdf https://doi.org/10.1029/2007GL032827 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00282593 Geophysical Research Letters, 2008, 35, pp.L05607. ⟨10.1029/2007GL032827⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2007GL032827 hal-00282593 https://hal.science/hal-00282593 https://hal.science/hal-00282593/document https://hal.science/hal-00282593/file/2007GL032827.pdf doi:10.1029/2007GL032827 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2007GL032827 |
container_title |
Geophysical Research Letters |
container_volume |
35 |
container_issue |
5 |
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1810481316095852544 |