Labrador Sea subsurface density as a precursor of multidecadal variability in the North Atlantic: a multi-model study
International audience The subpolar North Atlantic (SPNA) is a region with prominent decadal variability that has experienced remarkable warming and cooling trends in the last few decades. These observed trends have been preceded by slow-paced increases and decreases in the Labrador Sea density (LSD...
Published in: | Earth System Dynamics |
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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-03230866 https://hal.sorbonne-universite.fr/hal-03230866/document https://hal.sorbonne-universite.fr/hal-03230866/file/esd-12-419-2021.pdf https://doi.org/10.5194/esd-12-419-2021 |
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Institut national des sciences de l'Univers: HAL-INSU |
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language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Ortega, Pablo Robson, Jon I. Menary, Matthew, B Sutton, Rowan T. Blaker, Adam Germe, Agathe Hirschi, Joël J.-M. Sinha, Bablu Hermanson, Leon Yeager, Stephen Labrador Sea subsurface density as a precursor of multidecadal variability in the North Atlantic: a multi-model study |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience The subpolar North Atlantic (SPNA) is a region with prominent decadal variability that has experienced remarkable warming and cooling trends in the last few decades. These observed trends have been preceded by slow-paced increases and decreases in the Labrador Sea density (LSD), which are thought to be a precursor of large-scale ocean circulation changes. This article analyses the interrelationships between the LSD and the wider North Atlantic across an ensemble of coupled climate model simulations. In particular, it analyses the link between subsurface density and the deep boundary density, the Atlantic Meridional Overturning Circulation (AMOC), the subpolar gyre (SPG) circulation, and the upper-ocean temperature in the eastern SPNA.All simulations exhibit considerable multidecadal variability in the LSD and the ocean circulation indices, which are found to be interrelated. LSD is strongly linked to the strength of the subpolar AMOC and gyre circulation, and it is also linked to the subtropical AMOC, although the strength of this relationship is model-dependent and affected by the inclusion of the Ekman component. The connectivity of LSD with the subtropics is found to be sensitive to different model features, including the mean density stratification in the Labrador Sea, the strength and depth of the AMOC, and the depth at which the LSD propagates southward along the western boundary. Several of these quantities can also be computed from observations, and comparison with these observation-based quantities suggests that models representing a weaker link to the subtropical AMOC might be more realistic. |
author2 |
University of Reading (UOR) Barcelona Supercomputing Center - Centro Nacional de Supercomputacion (BSC-CNS) Océan et variabilité du climat (VARCLIM) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) National Oceanography Centre Southampton (NOC) University of Southampton Met Office Hadley Centre (MOHC) United Kingdom Met Office Exeter National Center for Atmospheric Research Boulder (NCAR) |
format |
Article in Journal/Newspaper |
author |
Ortega, Pablo Robson, Jon I. Menary, Matthew, B Sutton, Rowan T. Blaker, Adam Germe, Agathe Hirschi, Joël J.-M. Sinha, Bablu Hermanson, Leon Yeager, Stephen |
author_facet |
Ortega, Pablo Robson, Jon I. Menary, Matthew, B Sutton, Rowan T. Blaker, Adam Germe, Agathe Hirschi, Joël J.-M. Sinha, Bablu Hermanson, Leon Yeager, Stephen |
author_sort |
Ortega, Pablo |
title |
Labrador Sea subsurface density as a precursor of multidecadal variability in the North Atlantic: a multi-model study |
title_short |
Labrador Sea subsurface density as a precursor of multidecadal variability in the North Atlantic: a multi-model study |
title_full |
Labrador Sea subsurface density as a precursor of multidecadal variability in the North Atlantic: a multi-model study |
title_fullStr |
Labrador Sea subsurface density as a precursor of multidecadal variability in the North Atlantic: a multi-model study |
title_full_unstemmed |
Labrador Sea subsurface density as a precursor of multidecadal variability in the North Atlantic: a multi-model study |
title_sort |
labrador sea subsurface density as a precursor of multidecadal variability in the north atlantic: a multi-model study |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.sorbonne-universite.fr/hal-03230866 https://hal.sorbonne-universite.fr/hal-03230866/document https://hal.sorbonne-universite.fr/hal-03230866/file/esd-12-419-2021.pdf https://doi.org/10.5194/esd-12-419-2021 |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_source |
ISSN: 2190-4979 EISSN: 2190-4987 Earth System Dynamics https://hal.sorbonne-universite.fr/hal-03230866 Earth System Dynamics, 2021, 12 (2), pp.419 - 438. ⟨10.5194/esd-12-419-2021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/esd-12-419-2021 hal-03230866 https://hal.sorbonne-universite.fr/hal-03230866 https://hal.sorbonne-universite.fr/hal-03230866/document https://hal.sorbonne-universite.fr/hal-03230866/file/esd-12-419-2021.pdf doi:10.5194/esd-12-419-2021 WOS: 000644487900001 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/esd-12-419-2021 |
container_title |
Earth System Dynamics |
container_volume |
12 |
container_issue |
2 |
container_start_page |
419 |
op_container_end_page |
438 |
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1797586476641288192 |
spelling |
ftinsu:oai:HAL:hal-03230866v1 2024-04-28T08:27:37+00:00 Labrador Sea subsurface density as a precursor of multidecadal variability in the North Atlantic: a multi-model study Ortega, Pablo Robson, Jon I. Menary, Matthew, B Sutton, Rowan T. Blaker, Adam Germe, Agathe Hirschi, Joël J.-M. Sinha, Bablu Hermanson, Leon Yeager, Stephen University of Reading (UOR) Barcelona Supercomputing Center - Centro Nacional de Supercomputacion (BSC-CNS) Océan et variabilité du climat (VARCLIM) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) National Oceanography Centre Southampton (NOC) University of Southampton Met Office Hadley Centre (MOHC) United Kingdom Met Office Exeter National Center for Atmospheric Research Boulder (NCAR) 2021-04-26 https://hal.sorbonne-universite.fr/hal-03230866 https://hal.sorbonne-universite.fr/hal-03230866/document https://hal.sorbonne-universite.fr/hal-03230866/file/esd-12-419-2021.pdf https://doi.org/10.5194/esd-12-419-2021 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/esd-12-419-2021 hal-03230866 https://hal.sorbonne-universite.fr/hal-03230866 https://hal.sorbonne-universite.fr/hal-03230866/document https://hal.sorbonne-universite.fr/hal-03230866/file/esd-12-419-2021.pdf doi:10.5194/esd-12-419-2021 WOS: 000644487900001 info:eu-repo/semantics/OpenAccess ISSN: 2190-4979 EISSN: 2190-4987 Earth System Dynamics https://hal.sorbonne-universite.fr/hal-03230866 Earth System Dynamics, 2021, 12 (2), pp.419 - 438. ⟨10.5194/esd-12-419-2021⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftinsu https://doi.org/10.5194/esd-12-419-2021 2024-04-05T00:37:03Z International audience The subpolar North Atlantic (SPNA) is a region with prominent decadal variability that has experienced remarkable warming and cooling trends in the last few decades. These observed trends have been preceded by slow-paced increases and decreases in the Labrador Sea density (LSD), which are thought to be a precursor of large-scale ocean circulation changes. This article analyses the interrelationships between the LSD and the wider North Atlantic across an ensemble of coupled climate model simulations. In particular, it analyses the link between subsurface density and the deep boundary density, the Atlantic Meridional Overturning Circulation (AMOC), the subpolar gyre (SPG) circulation, and the upper-ocean temperature in the eastern SPNA.All simulations exhibit considerable multidecadal variability in the LSD and the ocean circulation indices, which are found to be interrelated. LSD is strongly linked to the strength of the subpolar AMOC and gyre circulation, and it is also linked to the subtropical AMOC, although the strength of this relationship is model-dependent and affected by the inclusion of the Ekman component. The connectivity of LSD with the subtropics is found to be sensitive to different model features, including the mean density stratification in the Labrador Sea, the strength and depth of the AMOC, and the depth at which the LSD propagates southward along the western boundary. Several of these quantities can also be computed from observations, and comparison with these observation-based quantities suggests that models representing a weaker link to the subtropical AMOC might be more realistic. Article in Journal/Newspaper Labrador Sea North Atlantic Institut national des sciences de l'Univers: HAL-INSU Earth System Dynamics 12 2 419 438 |