Reconciling the Relationship Between the AMOC and Labrador Sea in OSNAP Observations and Climate Models
International audience The AMOC (Atlantic Meridional Overturning Circulation) is a key driver of climate variability. Our understanding, based largely on climate models, is that the Labrador Sea has an important role in shaping the evolution of the AMOC. However, a recent high‐profile observational...
Published in: | Geophysical Research Letters |
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Main Authors: | , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Online Access: | https://hal.sorbonne-universite.fr/hal-02978297 https://hal.sorbonne-universite.fr/hal-02978297/document https://hal.sorbonne-universite.fr/hal-02978297/file/2020GL089793.pdf https://doi.org/10.1029/2020GL089793 |
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ftmuseumnhn:oai:HAL:hal-02978297v1 |
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openpolar |
institution |
Open Polar |
collection |
Muséum National d'Histoire Naturelle (MNHM): HAL |
op_collection_id |
ftmuseumnhn |
language |
English |
topic |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Menary, Matthew, B Jackson, Laura, C Lozier, M. Susan, Susan Reconciling the Relationship Between the AMOC and Labrador Sea in OSNAP Observations and Climate Models |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The AMOC (Atlantic Meridional Overturning Circulation) is a key driver of climate variability. Our understanding, based largely on climate models, is that the Labrador Sea has an important role in shaping the evolution of the AMOC. However, a recent high‐profile observational campaign (Overturning in the Subpolar North Atlantic, OSNAP) has called into question the importance of the Labrador Sea, and hence the credibility of the AMOC representation in climate models. Here, we attempt to reconcile these viewpoints by making the first direct comparison between OSNAP and a coupled climate model. The model compares well to the observations, demonstrating a more prominent role for overturning in the eastern than western subpolar gyre. Density anomalies generated by surface forcing in the Irminger Sea propagate into the Labrador Sea, where they dominate the density variability. Thus, the Labrador Sea may not be the origin of AMOC variability despite correlations with densities there. |
author2 |
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) Met Office Hadley Centre (MOHC) United Kingdom Met Office Exeter Georgia Institute of Technology Atlanta |
format |
Article in Journal/Newspaper |
author |
Menary, Matthew, B Jackson, Laura, C Lozier, M. Susan, Susan |
author_facet |
Menary, Matthew, B Jackson, Laura, C Lozier, M. Susan, Susan |
author_sort |
Menary, Matthew, B |
title |
Reconciling the Relationship Between the AMOC and Labrador Sea in OSNAP Observations and Climate Models |
title_short |
Reconciling the Relationship Between the AMOC and Labrador Sea in OSNAP Observations and Climate Models |
title_full |
Reconciling the Relationship Between the AMOC and Labrador Sea in OSNAP Observations and Climate Models |
title_fullStr |
Reconciling the Relationship Between the AMOC and Labrador Sea in OSNAP Observations and Climate Models |
title_full_unstemmed |
Reconciling the Relationship Between the AMOC and Labrador Sea in OSNAP Observations and Climate Models |
title_sort |
reconciling the relationship between the amoc and labrador sea in osnap observations and climate models |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.sorbonne-universite.fr/hal-02978297 https://hal.sorbonne-universite.fr/hal-02978297/document https://hal.sorbonne-universite.fr/hal-02978297/file/2020GL089793.pdf https://doi.org/10.1029/2020GL089793 |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.sorbonne-universite.fr/hal-02978297 Geophysical Research Letters, 2020, 47 (18), pp.e2020GL089793. ⟨10.1029/2020GL089793⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL089793 hal-02978297 https://hal.sorbonne-universite.fr/hal-02978297 https://hal.sorbonne-universite.fr/hal-02978297/document https://hal.sorbonne-universite.fr/hal-02978297/file/2020GL089793.pdf doi:10.1029/2020GL089793 WOS: 000576634400042 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2020GL089793 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
18 |
_version_ |
1799483296087801856 |
spelling |
ftmuseumnhn:oai:HAL:hal-02978297v1 2024-05-19T07:43:34+00:00 Reconciling the Relationship Between the AMOC and Labrador Sea in OSNAP Observations and Climate Models Menary, Matthew, B Jackson, Laura, C Lozier, M. Susan, Susan 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) Met Office Hadley Centre (MOHC) United Kingdom Met Office Exeter Georgia Institute of Technology Atlanta 2020 https://hal.sorbonne-universite.fr/hal-02978297 https://hal.sorbonne-universite.fr/hal-02978297/document https://hal.sorbonne-universite.fr/hal-02978297/file/2020GL089793.pdf https://doi.org/10.1029/2020GL089793 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL089793 hal-02978297 https://hal.sorbonne-universite.fr/hal-02978297 https://hal.sorbonne-universite.fr/hal-02978297/document https://hal.sorbonne-universite.fr/hal-02978297/file/2020GL089793.pdf doi:10.1029/2020GL089793 WOS: 000576634400042 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.sorbonne-universite.fr/hal-02978297 Geophysical Research Letters, 2020, 47 (18), pp.e2020GL089793. ⟨10.1029/2020GL089793⟩ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2020 ftmuseumnhn https://doi.org/10.1029/2020GL089793 2024-04-25T00:48:47Z International audience The AMOC (Atlantic Meridional Overturning Circulation) is a key driver of climate variability. Our understanding, based largely on climate models, is that the Labrador Sea has an important role in shaping the evolution of the AMOC. However, a recent high‐profile observational campaign (Overturning in the Subpolar North Atlantic, OSNAP) has called into question the importance of the Labrador Sea, and hence the credibility of the AMOC representation in climate models. Here, we attempt to reconcile these viewpoints by making the first direct comparison between OSNAP and a coupled climate model. The model compares well to the observations, demonstrating a more prominent role for overturning in the eastern than western subpolar gyre. Density anomalies generated by surface forcing in the Irminger Sea propagate into the Labrador Sea, where they dominate the density variability. Thus, the Labrador Sea may not be the origin of AMOC variability despite correlations with densities there. Article in Journal/Newspaper Labrador Sea North Atlantic Muséum National d'Histoire Naturelle (MNHM): HAL Geophysical Research Letters 47 18 |