Formation of subantarctic mode water in the southeastern Indian Ocean
Subantarctic Mode Water (SAMW) is the name given to the relatively deep surface mixed layers found directly north of the Subantarctic Front in the Southern Ocean, and their extension into the thermocline as weakly stratified or low potential vorticity water masses. The objective of this study is to...
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Online Access: | https://hal.archives-ouvertes.fr/hal-00282592 https://doi.org/10.1007/s10236-005-0054-x |
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ftccsdartic:oai:HAL:hal-00282592v1 2023-05-15T18:25:36+02:00 Formation of subantarctic mode water in the southeastern Indian Ocean Sallee, J.B. Wienders, Nicolas Speer, Kevin Morrow, Rosemary 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) Department of Oceanography Florida State University Tallahassee (FSU) 2006 https://hal.archives-ouvertes.fr/hal-00282592 https://doi.org/10.1007/s10236-005-0054-x en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s10236-005-0054-x hal-00282592 https://hal.archives-ouvertes.fr/hal-00282592 doi:10.1007/s10236-005-0054-x ISSN: 1616-7341 EISSN: 1616-7228 Ocean Dynamics https://hal.archives-ouvertes.fr/hal-00282592 Ocean Dynamics, Springer Verlag, 2006, 56, pp.525-542. ⟨10.1007/s10236-005-0054-x⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2006 ftccsdartic https://doi.org/10.1007/s10236-005-0054-x 2021-11-21T05:14:22Z Subantarctic Mode Water (SAMW) is the name given to the relatively deep surface mixed layers found directly north of the Subantarctic Front in the Southern Ocean, and their extension into the thermocline as weakly stratified or low potential vorticity water masses. The objective of this study is to begin an investigation into the mechanisms controlling SAMW formation, through a heat budget calculation. ARGO profiling floats provide estimates of temperature and salinity typically in the upper 2,000 m and the horizontal velocity at various parking depths. These data are used to estimate terms in the mode water heat budget; in addition, mode water circulation is determined with ARGO data and earlier ALACE float data, and climatological hydrography. We find a rapid transition to thicker layers in the central South Indian Ocean, at about 70°S, associated with a reversal of the horizontal eddy heat diffusion in the surface layer and the meridional expansion of the ACC as it rounds the Kerguelen Plateau. These effects are ultimately related to the bathymetry of the region, leading to the seat of formation in the region southwest of Australia. Upstream of this region, the dominant terms in the heat budget are the air–sea flux, eddy diffusion, and Ekman heat transport, all having approximately equal importance. Within the formation area, the Ekman contribution dominates and leads to a downstream evolution of mode water properties. Article in Journal/Newspaper Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean Kerguelen Indian Ocean Dynamics 56 5-6 525 542 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Sallee, J.B. Wienders, Nicolas Speer, Kevin Morrow, Rosemary Formation of subantarctic mode water in the southeastern Indian Ocean |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
Subantarctic Mode Water (SAMW) is the name given to the relatively deep surface mixed layers found directly north of the Subantarctic Front in the Southern Ocean, and their extension into the thermocline as weakly stratified or low potential vorticity water masses. The objective of this study is to begin an investigation into the mechanisms controlling SAMW formation, through a heat budget calculation. ARGO profiling floats provide estimates of temperature and salinity typically in the upper 2,000 m and the horizontal velocity at various parking depths. These data are used to estimate terms in the mode water heat budget; in addition, mode water circulation is determined with ARGO data and earlier ALACE float data, and climatological hydrography. We find a rapid transition to thicker layers in the central South Indian Ocean, at about 70°S, associated with a reversal of the horizontal eddy heat diffusion in the surface layer and the meridional expansion of the ACC as it rounds the Kerguelen Plateau. These effects are ultimately related to the bathymetry of the region, leading to the seat of formation in the region southwest of Australia. Upstream of this region, the dominant terms in the heat budget are the air–sea flux, eddy diffusion, and Ekman heat transport, all having approximately equal importance. Within the formation area, the Ekman contribution dominates and leads to a downstream evolution of mode water properties. |
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) Department of Oceanography Florida State University Tallahassee (FSU) |
format |
Article in Journal/Newspaper |
author |
Sallee, J.B. Wienders, Nicolas Speer, Kevin Morrow, Rosemary |
author_facet |
Sallee, J.B. Wienders, Nicolas Speer, Kevin Morrow, Rosemary |
author_sort |
Sallee, J.B. |
title |
Formation of subantarctic mode water in the southeastern Indian Ocean |
title_short |
Formation of subantarctic mode water in the southeastern Indian Ocean |
title_full |
Formation of subantarctic mode water in the southeastern Indian Ocean |
title_fullStr |
Formation of subantarctic mode water in the southeastern Indian Ocean |
title_full_unstemmed |
Formation of subantarctic mode water in the southeastern Indian Ocean |
title_sort |
formation of subantarctic mode water in the southeastern indian ocean |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.archives-ouvertes.fr/hal-00282592 https://doi.org/10.1007/s10236-005-0054-x |
geographic |
Southern Ocean Kerguelen Indian |
geographic_facet |
Southern Ocean Kerguelen Indian |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 1616-7341 EISSN: 1616-7228 Ocean Dynamics https://hal.archives-ouvertes.fr/hal-00282592 Ocean Dynamics, Springer Verlag, 2006, 56, pp.525-542. ⟨10.1007/s10236-005-0054-x⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10236-005-0054-x hal-00282592 https://hal.archives-ouvertes.fr/hal-00282592 doi:10.1007/s10236-005-0054-x |
op_doi |
https://doi.org/10.1007/s10236-005-0054-x |
container_title |
Ocean Dynamics |
container_volume |
56 |
container_issue |
5-6 |
container_start_page |
525 |
op_container_end_page |
542 |
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1766207158782787584 |