Atlantic multidecadal oceanic variability and its influence on the atmosphere in a climate model
International audience The mechanisms controlling the decadal to multidecadal variability of the Atlantic Meridional Overturning Circulation (MOC) and its influence on the atmosphere are investigated using a control simulation with the IPSL-CM4 climate model. The multidecadal fluctuations of the MOC...
Published in: | Climate Dynamics |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2009
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Online Access: | https://hal.archives-ouvertes.fr/hal-00760271 https://doi.org/10.1007/S00382-008-0452-0 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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language |
English |
topic |
Atlantic Meridional Overturning Circulation (MOC) Atlantic Multidecadal Oscillation (AMO) Ocean-to-atmosphere feedback Air-sea interactions [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
Atlantic Meridional Overturning Circulation (MOC) Atlantic Multidecadal Oscillation (AMO) Ocean-to-atmosphere feedback Air-sea interactions [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] M'Sadek, Rym Frankignoul, Claude Atlantic multidecadal oceanic variability and its influence on the atmosphere in a climate model |
topic_facet |
Atlantic Meridional Overturning Circulation (MOC) Atlantic Multidecadal Oscillation (AMO) Ocean-to-atmosphere feedback Air-sea interactions [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience The mechanisms controlling the decadal to multidecadal variability of the Atlantic Meridional Overturning Circulation (MOC) and its influence on the atmosphere are investigated using a control simulation with the IPSL-CM4 climate model. The multidecadal fluctuations of the MOC are mostly driven by deep convection in the subpolar gyre, which occurs south of Iceland in the model. The latter is primarily influenced by the anomalous advection of salinity due to changes in the East Atlantic Pattern (EAP), which is the second mode of atmospheric variability in the North Atlantic region. The North Atlantic Oscillation is the dominant mode, but it plays a secondary role in the MOC fluctuations. During summer, the MOC variability is shown to have a significant impact on the atmosphere in the North Atlantic-European sector. The MOC influence is due to an interhemispheric sea surface temperature (SST) anomaly with opposite signs in the two hemispheres but largest amplitude in the northern one. The SST pattern driven by the MOC mostly resembles the model Atlantic Multidecadal Oscillation (AMO) and bears some similarity with the observed one. It is shown that the AMO reflects both the MOC influence and the local atmospheric forcing. Hence, the MOC influence on climate is best detected using lagged relations between climatic fields. The atmospheric response resembles the EAP, in a phase that might induce a weak positive feedback on the MOC. |
author2 |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) 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 Paris) 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 |
M'Sadek, Rym Frankignoul, Claude |
author_facet |
M'Sadek, Rym Frankignoul, Claude |
author_sort |
M'Sadek, Rym |
title |
Atlantic multidecadal oceanic variability and its influence on the atmosphere in a climate model |
title_short |
Atlantic multidecadal oceanic variability and its influence on the atmosphere in a climate model |
title_full |
Atlantic multidecadal oceanic variability and its influence on the atmosphere in a climate model |
title_fullStr |
Atlantic multidecadal oceanic variability and its influence on the atmosphere in a climate model |
title_full_unstemmed |
Atlantic multidecadal oceanic variability and its influence on the atmosphere in a climate model |
title_sort |
atlantic multidecadal oceanic variability and its influence on the atmosphere in a climate model |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.archives-ouvertes.fr/hal-00760271 https://doi.org/10.1007/S00382-008-0452-0 |
genre |
Iceland North Atlantic North Atlantic oscillation |
genre_facet |
Iceland North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.archives-ouvertes.fr/hal-00760271 Climate Dynamics, Springer Verlag, 2009, 33, pp.45-62. ⟨10.1007/S00382-008-0452-0⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/S00382-008-0452-0 hal-00760271 https://hal.archives-ouvertes.fr/hal-00760271 doi:10.1007/S00382-008-0452-0 BIBCODE: 2009ClDy.33.45M |
op_doi |
https://doi.org/10.1007/S00382-008-0452-0 |
container_title |
Climate Dynamics |
container_volume |
33 |
container_issue |
1 |
container_start_page |
45 |
op_container_end_page |
62 |
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1766042163794149376 |
spelling |
ftccsdartic:oai:HAL:hal-00760271v1 2023-05-15T16:52:02+02:00 Atlantic multidecadal oceanic variability and its influence on the atmosphere in a climate model M'Sadek, Rym Frankignoul, Claude Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) 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 Paris) 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) 2009-07 https://hal.archives-ouvertes.fr/hal-00760271 https://doi.org/10.1007/S00382-008-0452-0 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/S00382-008-0452-0 hal-00760271 https://hal.archives-ouvertes.fr/hal-00760271 doi:10.1007/S00382-008-0452-0 BIBCODE: 2009ClDy.33.45M ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.archives-ouvertes.fr/hal-00760271 Climate Dynamics, Springer Verlag, 2009, 33, pp.45-62. ⟨10.1007/S00382-008-0452-0⟩ Atlantic Meridional Overturning Circulation (MOC) Atlantic Multidecadal Oscillation (AMO) Ocean-to-atmosphere feedback Air-sea interactions [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2009 ftccsdartic https://doi.org/10.1007/S00382-008-0452-0 2021-11-28T01:26:20Z International audience The mechanisms controlling the decadal to multidecadal variability of the Atlantic Meridional Overturning Circulation (MOC) and its influence on the atmosphere are investigated using a control simulation with the IPSL-CM4 climate model. The multidecadal fluctuations of the MOC are mostly driven by deep convection in the subpolar gyre, which occurs south of Iceland in the model. The latter is primarily influenced by the anomalous advection of salinity due to changes in the East Atlantic Pattern (EAP), which is the second mode of atmospheric variability in the North Atlantic region. The North Atlantic Oscillation is the dominant mode, but it plays a secondary role in the MOC fluctuations. During summer, the MOC variability is shown to have a significant impact on the atmosphere in the North Atlantic-European sector. The MOC influence is due to an interhemispheric sea surface temperature (SST) anomaly with opposite signs in the two hemispheres but largest amplitude in the northern one. The SST pattern driven by the MOC mostly resembles the model Atlantic Multidecadal Oscillation (AMO) and bears some similarity with the observed one. It is shown that the AMO reflects both the MOC influence and the local atmospheric forcing. Hence, the MOC influence on climate is best detected using lagged relations between climatic fields. The atmospheric response resembles the EAP, in a phase that might induce a weak positive feedback on the MOC. Article in Journal/Newspaper Iceland North Atlantic North Atlantic oscillation Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Climate Dynamics 33 1 45 62 |