Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current
International audience An eddying global model is used to study the characteristics of the Antarctic Circumpolar Current (ACC) in a streamline-following framework. Previous model-based estimates of the meridional circulation were calculated using zonal averages: this method leads to a counter-intuit...
Published in: | Ocean Science |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2007
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Online Access: | https://hal.science/hal-00331147 https://hal.science/hal-00331147/document https://hal.science/hal-00331147/file/os-3-491-2007.pdf https://doi.org/10.5194/os-3-491-2007 |
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ftuniversailles:oai:HAL:hal-00331147v1 |
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openpolar |
institution |
Open Polar |
collection |
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
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ftuniversailles |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Tréguier, Anne-Marie England, Matthew H. Rintoul, Stephen R. Madec, Gurvan Le Sommer, Julien Molines, Jean-Marc Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience An eddying global model is used to study the characteristics of the Antarctic Circumpolar Current (ACC) in a streamline-following framework. Previous model-based estimates of the meridional circulation were calculated using zonal averages: this method leads to a counter-intuitive poleward circulation of the less dense waters, and underestimates the eddy effects. We show that on the contrary, the upper ocean circulation across streamlines agrees with the theoretical view: an equatorward mean flow partially cancelled by a poleward eddy mass flux. Two model simulations, in which the buoyancy forcing above the ACC changes from positive to negative, suggest that the relationship between the residual meridional circulation and the surface buoyancy flux is not as straightforward as assumed by the simplest theoretical models: the sign of the residual circulation cannot be inferred from the surface buoyancy forcing only. Among the other processes that likely play a part in setting the meridional circulation, our model results emphasize the complex three-dimensional structure of the ACC (probably not well accounted for in streamline-averaged, two-dimensional models) and the distinct role of temperature and salinity in the definition of the density field. Heat and salt transports by the time-mean flow are important even across time-mean streamlines. Heat and salt are balanced in the ACC, the model drift being small, but the nonlinearity of the equation of state cannot be ignored in the density balance. |
author2 |
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) Climate Change Research Centre Sydney (CCRC) University of New South Wales Sydney (UNSW) CSIRO Wealth from Oceans National Research Flagship and Antarctic Climate and Ecosystems CRC Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Tréguier, Anne-Marie England, Matthew H. Rintoul, Stephen R. Madec, Gurvan Le Sommer, Julien Molines, Jean-Marc |
author_facet |
Tréguier, Anne-Marie England, Matthew H. Rintoul, Stephen R. Madec, Gurvan Le Sommer, Julien Molines, Jean-Marc |
author_sort |
Tréguier, Anne-Marie |
title |
Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current |
title_short |
Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current |
title_full |
Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current |
title_fullStr |
Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current |
title_full_unstemmed |
Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current |
title_sort |
southern ocean overturning across streamlines in an eddying simulation of the antarctic circumpolar current |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00331147 https://hal.science/hal-00331147/document https://hal.science/hal-00331147/file/os-3-491-2007.pdf https://doi.org/10.5194/os-3-491-2007 |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-00331147 Ocean Science, 2007, 3 (4), pp.491-507. ⟨10.5194/os-3-491-2007⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/os-3-491-2007 hal-00331147 https://hal.science/hal-00331147 https://hal.science/hal-00331147/document https://hal.science/hal-00331147/file/os-3-491-2007.pdf doi:10.5194/os-3-491-2007 IRD: PAR00002827 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/os-3-491-2007 |
container_title |
Ocean Science |
container_volume |
3 |
container_issue |
4 |
container_start_page |
491 |
op_container_end_page |
507 |
_version_ |
1799470186905993216 |
spelling |
ftuniversailles:oai:HAL:hal-00331147v1 2024-05-19T07:32:12+00:00 Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current Tréguier, Anne-Marie England, Matthew H. Rintoul, Stephen R. Madec, Gurvan Le Sommer, Julien Molines, Jean-Marc 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) Climate Change Research Centre Sydney (CCRC) University of New South Wales Sydney (UNSW) CSIRO Wealth from Oceans National Research Flagship and Antarctic Climate and Ecosystems CRC Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) 2007-12-19 https://hal.science/hal-00331147 https://hal.science/hal-00331147/document https://hal.science/hal-00331147/file/os-3-491-2007.pdf https://doi.org/10.5194/os-3-491-2007 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/os-3-491-2007 hal-00331147 https://hal.science/hal-00331147 https://hal.science/hal-00331147/document https://hal.science/hal-00331147/file/os-3-491-2007.pdf doi:10.5194/os-3-491-2007 IRD: PAR00002827 info:eu-repo/semantics/OpenAccess ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-00331147 Ocean Science, 2007, 3 (4), pp.491-507. ⟨10.5194/os-3-491-2007⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2007 ftuniversailles https://doi.org/10.5194/os-3-491-2007 2024-04-25T00:26:17Z International audience An eddying global model is used to study the characteristics of the Antarctic Circumpolar Current (ACC) in a streamline-following framework. Previous model-based estimates of the meridional circulation were calculated using zonal averages: this method leads to a counter-intuitive poleward circulation of the less dense waters, and underestimates the eddy effects. We show that on the contrary, the upper ocean circulation across streamlines agrees with the theoretical view: an equatorward mean flow partially cancelled by a poleward eddy mass flux. Two model simulations, in which the buoyancy forcing above the ACC changes from positive to negative, suggest that the relationship between the residual meridional circulation and the surface buoyancy flux is not as straightforward as assumed by the simplest theoretical models: the sign of the residual circulation cannot be inferred from the surface buoyancy forcing only. Among the other processes that likely play a part in setting the meridional circulation, our model results emphasize the complex three-dimensional structure of the ACC (probably not well accounted for in streamline-averaged, two-dimensional models) and the distinct role of temperature and salinity in the definition of the density field. Heat and salt transports by the time-mean flow are important even across time-mean streamlines. Heat and salt are balanced in the ACC, the model drift being small, but the nonlinearity of the equation of state cannot be ignored in the density balance. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Ocean Science 3 4 491 507 |