Multi-centennial variability driven by salinity exchanges between the Atlantic and the Arctic Ocean in a coupled climate model
International audience The IPSL‐CM6‐LR atmosphere‐ocean coupled model exhibits a pronounced multi‐centennial variability of the Atlantic meridional overturning circulation (AMOC), driven by delayed freshwater accumulation and release in the Arctic. The AMOC fluctuations are preceded by salinity‐driv...
Published in: | Journal of Advances in Modeling Earth Systems |
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Main Authors: | , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.sorbonne-universite.fr/hal-03149635 https://hal.sorbonne-universite.fr/hal-03149635/document https://hal.sorbonne-universite.fr/hal-03149635/file/2020MS002366.pdf https://doi.org/10.1029/2020MS002366 |
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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 |
Arctic North Atlantic AMOC Centennial variability Climate model [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
Arctic North Atlantic AMOC Centennial variability Climate model [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Jiang, Weimin Gastineau, Guillaume Codron, Francis Multi-centennial variability driven by salinity exchanges between the Atlantic and the Arctic Ocean in a coupled climate model |
topic_facet |
Arctic North Atlantic AMOC Centennial variability Climate model [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience The IPSL‐CM6‐LR atmosphere‐ocean coupled model exhibits a pronounced multi‐centennial variability of the Atlantic meridional overturning circulation (AMOC), driven by delayed freshwater accumulation and release in the Arctic. The AMOC fluctuations are preceded by salinity‐driven density anomalies in the main deep convection sites in the Labrador and Greenland seas. During a strong AMOC, a combination of reduced sea‐ice volume and anomalous currents reduces the freshwater export from the Arctic and leads instead to a slow accumulation of freshwater in the central Arctic. Simultaneously, the saltier Atlantic inflow through the Barents Sea results in a positive salinity anomaly in the Eastern Arctic subsurface. When the surface Central Arctic freshwater pool finally reaches the Lincoln Sea, the oceanic currents around Greenland reorganize, leading to the export of the anomalous Arctic freshwater to the North Atlantic, enhancing the stratification in deep convection sites. The AMOC then decreases, positive salinity anomalies appear in the Central Arctic, and the variability switches to the opposite phase. These AMOC and sea ice fluctuations have broader climate impacts, with a strong AMOC leading to a mean warming of about 0.4°C north of 20°N, reaching up to 1°C in the Arctic lower troposphere during winter. In all seasons, a northward displacement of the intertropical convergence zone is also simulated. |
author2 |
Océan et variabilité du climat (VARCLIM) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) 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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) 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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU) MOGPA ANR-17-EURE-0006,IPSL-CGS,IPSL Climate graduate school(2017) European Project: 727852,Blue-Action(2016) |
format |
Article in Journal/Newspaper |
author |
Jiang, Weimin Gastineau, Guillaume Codron, Francis |
author_facet |
Jiang, Weimin Gastineau, Guillaume Codron, Francis |
author_sort |
Jiang, Weimin |
title |
Multi-centennial variability driven by salinity exchanges between the Atlantic and the Arctic Ocean in a coupled climate model |
title_short |
Multi-centennial variability driven by salinity exchanges between the Atlantic and the Arctic Ocean in a coupled climate model |
title_full |
Multi-centennial variability driven by salinity exchanges between the Atlantic and the Arctic Ocean in a coupled climate model |
title_fullStr |
Multi-centennial variability driven by salinity exchanges between the Atlantic and the Arctic Ocean in a coupled climate model |
title_full_unstemmed |
Multi-centennial variability driven by salinity exchanges between the Atlantic and the Arctic Ocean in a coupled climate model |
title_sort |
multi-centennial variability driven by salinity exchanges between the atlantic and the arctic ocean in a coupled climate model |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.sorbonne-universite.fr/hal-03149635 https://hal.sorbonne-universite.fr/hal-03149635/document https://hal.sorbonne-universite.fr/hal-03149635/file/2020MS002366.pdf https://doi.org/10.1029/2020MS002366 |
geographic |
Arctic Arctic Ocean Barents Sea Greenland |
geographic_facet |
Arctic Arctic Ocean Barents Sea Greenland |
genre |
Arctic Arctic Arctic Ocean Barents Sea Greenland Lincoln Sea North Atlantic Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Barents Sea Greenland Lincoln Sea North Atlantic Sea ice |
op_source |
ISSN: 1942-2466 Journal of Advances in Modeling Earth Systems https://hal.sorbonne-universite.fr/hal-03149635 Journal of Advances in Modeling Earth Systems, American Geophysical Union, 2021, 13 (3), pp.e2020MS002366. ⟨10.1029/2020MS002366⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020MS002366 info:eu-repo/grantAgreement//727852/EU/Blue-Action: Arctic impact on weather and climat/Blue-Action hal-03149635 https://hal.sorbonne-universite.fr/hal-03149635 https://hal.sorbonne-universite.fr/hal-03149635/document https://hal.sorbonne-universite.fr/hal-03149635/file/2020MS002366.pdf doi:10.1029/2020MS002366 WOS: 000635263700007 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2020MS002366 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
13 |
container_issue |
3 |
_version_ |
1766301348650811392 |
spelling |
ftccsdartic:oai:HAL:hal-03149635v1 2023-05-15T14:27:33+02:00 Multi-centennial variability driven by salinity exchanges between the Atlantic and the Arctic Ocean in a coupled climate model Jiang, Weimin Gastineau, Guillaume Codron, Francis Océan et variabilité du climat (VARCLIM) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) 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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) 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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU) MOGPA ANR-17-EURE-0006,IPSL-CGS,IPSL Climate graduate school(2017) European Project: 727852,Blue-Action(2016) 2021-03 https://hal.sorbonne-universite.fr/hal-03149635 https://hal.sorbonne-universite.fr/hal-03149635/document https://hal.sorbonne-universite.fr/hal-03149635/file/2020MS002366.pdf https://doi.org/10.1029/2020MS002366 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2020MS002366 info:eu-repo/grantAgreement//727852/EU/Blue-Action: Arctic impact on weather and climat/Blue-Action hal-03149635 https://hal.sorbonne-universite.fr/hal-03149635 https://hal.sorbonne-universite.fr/hal-03149635/document https://hal.sorbonne-universite.fr/hal-03149635/file/2020MS002366.pdf doi:10.1029/2020MS002366 WOS: 000635263700007 info:eu-repo/semantics/OpenAccess ISSN: 1942-2466 Journal of Advances in Modeling Earth Systems https://hal.sorbonne-universite.fr/hal-03149635 Journal of Advances in Modeling Earth Systems, American Geophysical Union, 2021, 13 (3), pp.e2020MS002366. ⟨10.1029/2020MS002366⟩ Arctic North Atlantic AMOC Centennial variability Climate model [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1029/2020MS002366 2021-12-19T00:28:35Z International audience The IPSL‐CM6‐LR atmosphere‐ocean coupled model exhibits a pronounced multi‐centennial variability of the Atlantic meridional overturning circulation (AMOC), driven by delayed freshwater accumulation and release in the Arctic. The AMOC fluctuations are preceded by salinity‐driven density anomalies in the main deep convection sites in the Labrador and Greenland seas. During a strong AMOC, a combination of reduced sea‐ice volume and anomalous currents reduces the freshwater export from the Arctic and leads instead to a slow accumulation of freshwater in the central Arctic. Simultaneously, the saltier Atlantic inflow through the Barents Sea results in a positive salinity anomaly in the Eastern Arctic subsurface. When the surface Central Arctic freshwater pool finally reaches the Lincoln Sea, the oceanic currents around Greenland reorganize, leading to the export of the anomalous Arctic freshwater to the North Atlantic, enhancing the stratification in deep convection sites. The AMOC then decreases, positive salinity anomalies appear in the Central Arctic, and the variability switches to the opposite phase. These AMOC and sea ice fluctuations have broader climate impacts, with a strong AMOC leading to a mean warming of about 0.4°C north of 20°N, reaching up to 1°C in the Arctic lower troposphere during winter. In all seasons, a northward displacement of the intertropical convergence zone is also simulated. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Barents Sea Greenland Lincoln Sea North Atlantic Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Arctic Ocean Barents Sea Greenland Journal of Advances in Modeling Earth Systems 13 3 |