Links between the Southern Annular Mode and the Atlantic Meridional Overturning Circulation in a Climate Model
International audience The links between the atmospheric southern annular mode (SAM), the Southern Ocean, and the Atlantic meridional overturning circulation (AMOC) at interannual to multidecadal time scales are investigated in a 500-yr control integration of the L'Institut Pierre-Simon Laplace...
Published in: | Journal of Climate |
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Main Authors: | , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2011
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Online Access: | https://hal.science/hal-00994602 https://hal.science/hal-00994602/document https://hal.science/hal-00994602/file/Marini_JCLI_2011.pdf https://doi.org/10.1175/2010JCLI3576.1 |
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HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
op_collection_id |
ftceafr |
language |
English |
topic |
Annular mode Meridional overturning circulation Atlantic Ocean Climate models ENSO [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
Annular mode Meridional overturning circulation Atlantic Ocean Climate models ENSO [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Marini, Camille Frankignoul, Claude Mignot, Juliette Links between the Southern Annular Mode and the Atlantic Meridional Overturning Circulation in a Climate Model |
topic_facet |
Annular mode Meridional overturning circulation Atlantic Ocean Climate models ENSO [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience The links between the atmospheric southern annular mode (SAM), the Southern Ocean, and the Atlantic meridional overturning circulation (AMOC) at interannual to multidecadal time scales are investigated in a 500-yr control integration of the L'Institut Pierre-Simon Laplace Coupled Model, version 4 (IPSL CM4) climate model. The Antarctic Circumpolar Current, as described by its transport through the Drake Passage, is well correlated with the SAM at the yearly time scale, reflecting that an intensification of the westerlies south of 45°S leads to its acceleration. Also in phase with a positive SAM, the global meridional overturning circulation is modified in the Southern Hemisphere, primarily reflecting a forced barotropic response. In the model, the AMOC and the SAM are linked at several time scales. An intensification of the AMOC lags a positive SAM by about 8 yr. This is due to a correlation between the SAM and the atmospheric circulation in the northern North Atlantic that reflects a symmetric ENSO influence on the two hemispheres, as well as an independent, delayed interhemispheric link driven by the SAM. Both effects lead to an intensification of the subpolar gyre and, by salinity advection, increased deep convection and a stronger AMOC. A slower oceanic link between the SAM and the AMOC is found at a multidecadal time scale. Salinity anomalies generated by the SAM enter the South Atlantic from the Drake Passage and, more importantly, the Indian Ocean; they propagate northward, eventually reaching the northern North Atlantic where, for a positive SAM, they decrease the vertical stratification and thus increase the AMOC. |
author2 |
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) |
format |
Article in Journal/Newspaper |
author |
Marini, Camille Frankignoul, Claude Mignot, Juliette |
author_facet |
Marini, Camille Frankignoul, Claude Mignot, Juliette |
author_sort |
Marini, Camille |
title |
Links between the Southern Annular Mode and the Atlantic Meridional Overturning Circulation in a Climate Model |
title_short |
Links between the Southern Annular Mode and the Atlantic Meridional Overturning Circulation in a Climate Model |
title_full |
Links between the Southern Annular Mode and the Atlantic Meridional Overturning Circulation in a Climate Model |
title_fullStr |
Links between the Southern Annular Mode and the Atlantic Meridional Overturning Circulation in a Climate Model |
title_full_unstemmed |
Links between the Southern Annular Mode and the Atlantic Meridional Overturning Circulation in a Climate Model |
title_sort |
links between the southern annular mode and the atlantic meridional overturning circulation in a climate model |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/hal-00994602 https://hal.science/hal-00994602/document https://hal.science/hal-00994602/file/Marini_JCLI_2011.pdf https://doi.org/10.1175/2010JCLI3576.1 |
genre |
Antarc* Antarctic Drake Passage North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage North Atlantic Southern Ocean |
op_source |
ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-00994602 Journal of Climate, 2011, 24 (3), pp.624-640. ⟨10.1175/2010JCLI3576.1⟩ http://journals.ametsoc.org/doi/abs/10.1175/2010JCLI3576.1 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/2010JCLI3576.1 hal-00994602 https://hal.science/hal-00994602 https://hal.science/hal-00994602/document https://hal.science/hal-00994602/file/Marini_JCLI_2011.pdf doi:10.1175/2010JCLI3576.1 IRD: fdi:010053437 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/2010JCLI3576.1 |
container_title |
Journal of Climate |
container_volume |
24 |
container_issue |
3 |
container_start_page |
624 |
op_container_end_page |
640 |
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1799470503848574976 |
spelling |
ftceafr:oai:HAL:hal-00994602v1 2024-05-19T07:32:28+00:00 Links between the Southern Annular Mode and the Atlantic Meridional Overturning Circulation in a Climate Model Marini, Camille Frankignoul, Claude Mignot, Juliette 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) 2011-02 https://hal.science/hal-00994602 https://hal.science/hal-00994602/document https://hal.science/hal-00994602/file/Marini_JCLI_2011.pdf https://doi.org/10.1175/2010JCLI3576.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/2010JCLI3576.1 hal-00994602 https://hal.science/hal-00994602 https://hal.science/hal-00994602/document https://hal.science/hal-00994602/file/Marini_JCLI_2011.pdf doi:10.1175/2010JCLI3576.1 IRD: fdi:010053437 info:eu-repo/semantics/OpenAccess ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-00994602 Journal of Climate, 2011, 24 (3), pp.624-640. ⟨10.1175/2010JCLI3576.1⟩ http://journals.ametsoc.org/doi/abs/10.1175/2010JCLI3576.1 Annular mode Meridional overturning circulation Atlantic Ocean Climate models ENSO [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2011 ftceafr https://doi.org/10.1175/2010JCLI3576.1 2024-04-25T01:14:23Z International audience The links between the atmospheric southern annular mode (SAM), the Southern Ocean, and the Atlantic meridional overturning circulation (AMOC) at interannual to multidecadal time scales are investigated in a 500-yr control integration of the L'Institut Pierre-Simon Laplace Coupled Model, version 4 (IPSL CM4) climate model. The Antarctic Circumpolar Current, as described by its transport through the Drake Passage, is well correlated with the SAM at the yearly time scale, reflecting that an intensification of the westerlies south of 45°S leads to its acceleration. Also in phase with a positive SAM, the global meridional overturning circulation is modified in the Southern Hemisphere, primarily reflecting a forced barotropic response. In the model, the AMOC and the SAM are linked at several time scales. An intensification of the AMOC lags a positive SAM by about 8 yr. This is due to a correlation between the SAM and the atmospheric circulation in the northern North Atlantic that reflects a symmetric ENSO influence on the two hemispheres, as well as an independent, delayed interhemispheric link driven by the SAM. Both effects lead to an intensification of the subpolar gyre and, by salinity advection, increased deep convection and a stronger AMOC. A slower oceanic link between the SAM and the AMOC is found at a multidecadal time scale. Salinity anomalies generated by the SAM enter the South Atlantic from the Drake Passage and, more importantly, the Indian Ocean; they propagate northward, eventually reaching the northern North Atlantic where, for a positive SAM, they decrease the vertical stratification and thus increase the AMOC. Article in Journal/Newspaper Antarc* Antarctic Drake Passage North Atlantic Southern Ocean HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Journal of Climate 24 3 624 640 |