Low‐frequency variability in the Southern Ocean region in a simplified coupled model
International audience Patterns of interannual variability of the ocean‐atmosphere coupled system in the Southern Hemisphere extratropics are studied with a simple dynamical model in order to determine the basic physical processes of interaction independently of tropical forcing. The model used is a...
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Online Access: | https://hal.science/hal-00497986 https://hal.science/hal-00497986/document https://hal.science/hal-00497986/file/Journal%20of%20Geophysical%20Research%20Oceans%20-%202006%20-%20Maze%20-%20Low%25u2010frequency%20variability%20in%20the%20Southern%20Ocean%20region%20in%20a.pdf https://doi.org/10.1029/2005JC003181 |
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ftecoleponts:oai:HAL:hal-00497986v1 2024-09-09T19:08:54+00:00 Low‐frequency variability in the Southern Ocean region in a simplified coupled model Maze, G. d'Andrea, F. Colin de Verdiere, Alain Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2006 https://hal.science/hal-00497986 https://hal.science/hal-00497986/document https://hal.science/hal-00497986/file/Journal%20of%20Geophysical%20Research%20Oceans%20-%202006%20-%20Maze%20-%20Low%25u2010frequency%20variability%20in%20the%20Southern%20Ocean%20region%20in%20a.pdf https://doi.org/10.1029/2005JC003181 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2005JC003181 hal-00497986 https://hal.science/hal-00497986 https://hal.science/hal-00497986/document https://hal.science/hal-00497986/file/Journal%20of%20Geophysical%20Research%20Oceans%20-%202006%20-%20Maze%20-%20Low%25u2010frequency%20variability%20in%20the%20Southern%20Ocean%20region%20in%20a.pdf doi:10.1029/2005JC003181 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-00497986 Journal of Geophysical Research. Oceans, 2006, 111, pp.C05010. ⟨10.1029/2005JC003181⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2006 ftecoleponts https://doi.org/10.1029/2005JC003181 2024-08-13T23:47:27Z International audience Patterns of interannual variability of the ocean‐atmosphere coupled system in the Southern Hemisphere extratropics are studied with a simple dynamical model in order to determine the basic physical processes of interaction independently of tropical forcing. The model used is an atmospheric quasi‐geostrophic model coupled to a “slab” oceanic mixed layer, which includes mean geostrophic advection by the Antarctic Circumpolar Current (ACC). The ocean‐atmosphere coupling occurs through surface heat fluxes and Ekman current heat advection. In a fully coupled simulation, the atmospheric part of the model, which includes high‐frequency transient eddies at midlatitudes, exhibits a strong Southern Annular Mode (SAM) as the first mode of variability at interannual timescales. The SAM‐related wind anomalies induce Ekman currents in the mixed layer which produce sea surface temperature anomalies. These are then advected along by the ACC. A forced mechanism where the ocean role is reduced to advect the sea surface temperature (SST) appears sufficient to reproduce the main features of the variability. Nevertheless, a positive feedback of the ocean was also found. It operates through anomalous Ekman currents heat advection and contributes to the maintenance of the SST anomaly. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean École des Ponts ParisTech: HAL Antarctic Southern Ocean The Antarctic Journal of Geophysical Research 111 C5 |
institution |
Open Polar |
collection |
École des Ponts ParisTech: HAL |
op_collection_id |
ftecoleponts |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Maze, G. d'Andrea, F. Colin de Verdiere, Alain Low‐frequency variability in the Southern Ocean region in a simplified coupled model |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Patterns of interannual variability of the ocean‐atmosphere coupled system in the Southern Hemisphere extratropics are studied with a simple dynamical model in order to determine the basic physical processes of interaction independently of tropical forcing. The model used is an atmospheric quasi‐geostrophic model coupled to a “slab” oceanic mixed layer, which includes mean geostrophic advection by the Antarctic Circumpolar Current (ACC). The ocean‐atmosphere coupling occurs through surface heat fluxes and Ekman current heat advection. In a fully coupled simulation, the atmospheric part of the model, which includes high‐frequency transient eddies at midlatitudes, exhibits a strong Southern Annular Mode (SAM) as the first mode of variability at interannual timescales. The SAM‐related wind anomalies induce Ekman currents in the mixed layer which produce sea surface temperature anomalies. These are then advected along by the ACC. A forced mechanism where the ocean role is reduced to advect the sea surface temperature (SST) appears sufficient to reproduce the main features of the variability. Nevertheless, a positive feedback of the ocean was also found. It operates through anomalous Ekman currents heat advection and contributes to the maintenance of the SST anomaly. |
author2 |
Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Maze, G. d'Andrea, F. Colin de Verdiere, Alain |
author_facet |
Maze, G. d'Andrea, F. Colin de Verdiere, Alain |
author_sort |
Maze, G. |
title |
Low‐frequency variability in the Southern Ocean region in a simplified coupled model |
title_short |
Low‐frequency variability in the Southern Ocean region in a simplified coupled model |
title_full |
Low‐frequency variability in the Southern Ocean region in a simplified coupled model |
title_fullStr |
Low‐frequency variability in the Southern Ocean region in a simplified coupled model |
title_full_unstemmed |
Low‐frequency variability in the Southern Ocean region in a simplified coupled model |
title_sort |
low‐frequency variability in the southern ocean region in a simplified coupled model |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00497986 https://hal.science/hal-00497986/document https://hal.science/hal-00497986/file/Journal%20of%20Geophysical%20Research%20Oceans%20-%202006%20-%20Maze%20-%20Low%25u2010frequency%20variability%20in%20the%20Southern%20Ocean%20region%20in%20a.pdf https://doi.org/10.1029/2005JC003181 |
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 |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-00497986 Journal of Geophysical Research. Oceans, 2006, 111, pp.C05010. ⟨10.1029/2005JC003181⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2005JC003181 hal-00497986 https://hal.science/hal-00497986 https://hal.science/hal-00497986/document https://hal.science/hal-00497986/file/Journal%20of%20Geophysical%20Research%20Oceans%20-%202006%20-%20Maze%20-%20Low%25u2010frequency%20variability%20in%20the%20Southern%20Ocean%20region%20in%20a.pdf doi:10.1029/2005JC003181 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2005JC003181 |
container_title |
Journal of Geophysical Research |
container_volume |
111 |
container_issue |
C5 |
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1809823157476917248 |