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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2021
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Online Access: | https://doi.org/10.5194/esd-12-419-2021 https://hal.sorbonne-universite.fr/hal-03230866/file/esd-12-419-2021.pdf https://hal.sorbonne-universite.fr/hal-03230866 |
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envir geo |
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envir geo Ortega, Pablo Robson, Jon I. Menary, Matthew, 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 |
envir geo |
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) 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) Océan et variabilité du climat (VARCLIM) 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)) National Oceanography Centre Southampton (NOC) University of Southampton Met Office Hadley Centre for Climate Change (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, 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, 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://doi.org/10.5194/esd-12-419-2021 https://hal.sorbonne-universite.fr/hal-03230866/file/esd-12-419-2021.pdf https://hal.sorbonne-universite.fr/hal-03230866 |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 2190-4979 EISSN: 2190-4987 Earth System Dynamics Earth System Dynamics, European Geosciences Union, 2021, 12 (2), pp.419 - 438. ⟨10.5194/esd-12-419-2021⟩ |
op_relation |
hal-03230866 WOS: 000644487900001 doi:10.5194/esd-12-419-2021 10670/1.vdt87n https://hal.sorbonne-universite.fr/hal-03230866/file/esd-12-419-2021.pdf https://hal.sorbonne-universite.fr/hal-03230866 |
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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1766060977157046272 |
spelling |
fttriple:oai:gotriple.eu:10670/1.vdt87n 2023-05-15T17:06:04+02:00 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, 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) 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) Océan et variabilité du climat (VARCLIM) 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)) National Oceanography Centre Southampton (NOC) University of Southampton Met Office Hadley Centre for Climate Change (MOHC) United Kingdom Met Office Exeter National Center for Atmospheric Research Boulder (NCAR) 2021-04-26 https://doi.org/10.5194/esd-12-419-2021 https://hal.sorbonne-universite.fr/hal-03230866/file/esd-12-419-2021.pdf https://hal.sorbonne-universite.fr/hal-03230866 en eng HAL CCSD European Geosciences Union hal-03230866 WOS: 000644487900001 doi:10.5194/esd-12-419-2021 10670/1.vdt87n https://hal.sorbonne-universite.fr/hal-03230866/file/esd-12-419-2021.pdf https://hal.sorbonne-universite.fr/hal-03230866 Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 2190-4979 EISSN: 2190-4987 Earth System Dynamics Earth System Dynamics, European Geosciences Union, 2021, 12 (2), pp.419 - 438. ⟨10.5194/esd-12-419-2021⟩ envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.5194/esd-12-419-2021 2023-01-22T17:10:16Z 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 Unknown Earth System Dynamics 12 2 419 438 |