Decadal fingerprints of freshwater discharge around Greenland in a multi-model ensemble
International audience The recent increase in the rate of the Greenland ice sheet melting has raised with urgency the question of the impact of such a melting on the climate. As former model projections, based on a coarse representation of the melting, show very different sensitivity to this melting...
Published in: | Climate Dynamics |
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Main Authors: | , , , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2013
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Online Access: | https://hal.science/hal-00871949 https://doi.org/10.1007/S00382-012-1479-9 |
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ftsorbonneuniv:oai:HAL:hal-00871949v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
Greenland ice sheet melting Ocean-atmosphere interactions Oceanic gyre Sea-level rise Oceanic dynamics North Atlantic AMOC Thermohaline circulation [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 |
Greenland ice sheet melting Ocean-atmosphere interactions Oceanic gyre Sea-level rise Oceanic dynamics North Atlantic AMOC Thermohaline circulation [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] Swingedouw, Didier Rodehacke, Christian B. Behrens, Erik Menary, Matthew, B Olsen, Steffen M. Gao, Yongqi Mikolajewicz, Uwe Mignot, Juliette Biastoch, Arne Decadal fingerprints of freshwater discharge around Greenland in a multi-model ensemble |
topic_facet |
Greenland ice sheet melting Ocean-atmosphere interactions Oceanic gyre Sea-level rise Oceanic dynamics North Atlantic AMOC Thermohaline circulation [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 recent increase in the rate of the Greenland ice sheet melting has raised with urgency the question of the impact of such a melting on the climate. As former model projections, based on a coarse representation of the melting, show very different sensitivity to this melting, it seems necessary to consider a multi-model ensemble to tackle this question. Here we use five coupled climate models and one ocean-only model to evaluate the impact of 0.1 Sv (1 Sv = 10 6 m 3 /s) of freshwater equally distributed around the coast of Greenland during the historical era 1965-2004. The ocean-only model helps to discriminate between oceanic and coupled responses. In this idealized framework, we find similar fingerprints in the fourth decade of hosing among the models, with a general weakening of the Atlantic Meridional Overturning Circulation (AMOC). Initially, the additional freshwater spreads along the main currents of the subpolar gyre. Part of the anomaly crosses the Atlantic eastward and enters into the Canary Current constituting a freshwater leakage tapping the subpolar gyre system. As a consequence, we show that the AMOC weakening is smaller if the leakage is larger. We argue that the magnitude of the freshwater leakage is related to the asymmetry between the subpolar-subtropical gyres in the control simulations, which may ultimately be a primary cause for the diversity of AMOC responses to the hosing in the multi-model ensemble. Another important fingerprint concerns a warming in the Nordic Seas in response to the re-emergence of Atlantic subsurface waters capped by the freshwater in the subpolar gyre. This subsurface heat anomaly reaches the Arctic where it emerges and induces a positive upper ocean salinity anomaly by introducing more Atlantic waters. We found similar climatic impacts in all the coupled ocean-atmosphere models with an atmospheric cooling of the North Atlantic except in the region around the Nordic Seas and a slight warming south of the equator in the Atlantic. This ... |
author2 |
Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Variabilité climatique tropicale et globale (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)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-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)-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-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)-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)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-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)-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) Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR) |
format |
Article in Journal/Newspaper |
author |
Swingedouw, Didier Rodehacke, Christian B. Behrens, Erik Menary, Matthew, B Olsen, Steffen M. Gao, Yongqi Mikolajewicz, Uwe Mignot, Juliette Biastoch, Arne |
author_facet |
Swingedouw, Didier Rodehacke, Christian B. Behrens, Erik Menary, Matthew, B Olsen, Steffen M. Gao, Yongqi Mikolajewicz, Uwe Mignot, Juliette Biastoch, Arne |
author_sort |
Swingedouw, Didier |
title |
Decadal fingerprints of freshwater discharge around Greenland in a multi-model ensemble |
title_short |
Decadal fingerprints of freshwater discharge around Greenland in a multi-model ensemble |
title_full |
Decadal fingerprints of freshwater discharge around Greenland in a multi-model ensemble |
title_fullStr |
Decadal fingerprints of freshwater discharge around Greenland in a multi-model ensemble |
title_full_unstemmed |
Decadal fingerprints of freshwater discharge around Greenland in a multi-model ensemble |
title_sort |
decadal fingerprints of freshwater discharge around greenland in a multi-model ensemble |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-00871949 https://doi.org/10.1007/S00382-012-1479-9 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Ice Sheet Nordic Seas North Atlantic |
genre_facet |
Arctic Greenland Ice Sheet Nordic Seas North Atlantic |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-00871949 Climate Dynamics, 2013, 41, pp.695-720. ⟨10.1007/S00382-012-1479-9⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/S00382-012-1479-9 hal-00871949 https://hal.science/hal-00871949 BIBCODE: 2013ClDy.41.695S doi:10.1007/S00382-012-1479-9 IRD: fdi:010060555 WOS: WOS:000322619500010 |
op_doi |
https://doi.org/10.1007/S00382-012-1479-9 |
container_title |
Climate Dynamics |
container_volume |
41 |
container_issue |
3-4 |
container_start_page |
695 |
op_container_end_page |
720 |
_version_ |
1801373255224786944 |
spelling |
ftsorbonneuniv:oai:HAL:hal-00871949v1 2024-06-09T07:44:31+00:00 Decadal fingerprints of freshwater discharge around Greenland in a multi-model ensemble Swingedouw, Didier Rodehacke, Christian B. Behrens, Erik Menary, Matthew, B Olsen, Steffen M. Gao, Yongqi Mikolajewicz, Uwe Mignot, Juliette Biastoch, Arne Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Variabilité climatique tropicale et globale (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)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-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)-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-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)-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)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-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)-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) Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR) 2013-08 https://hal.science/hal-00871949 https://doi.org/10.1007/S00382-012-1479-9 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/S00382-012-1479-9 hal-00871949 https://hal.science/hal-00871949 BIBCODE: 2013ClDy.41.695S doi:10.1007/S00382-012-1479-9 IRD: fdi:010060555 WOS: WOS:000322619500010 ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-00871949 Climate Dynamics, 2013, 41, pp.695-720. ⟨10.1007/S00382-012-1479-9⟩ Greenland ice sheet melting Ocean-atmosphere interactions Oceanic gyre Sea-level rise Oceanic dynamics North Atlantic AMOC Thermohaline circulation [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 2013 ftsorbonneuniv https://doi.org/10.1007/S00382-012-1479-9 2024-05-16T23:50:01Z International audience The recent increase in the rate of the Greenland ice sheet melting has raised with urgency the question of the impact of such a melting on the climate. As former model projections, based on a coarse representation of the melting, show very different sensitivity to this melting, it seems necessary to consider a multi-model ensemble to tackle this question. Here we use five coupled climate models and one ocean-only model to evaluate the impact of 0.1 Sv (1 Sv = 10 6 m 3 /s) of freshwater equally distributed around the coast of Greenland during the historical era 1965-2004. The ocean-only model helps to discriminate between oceanic and coupled responses. In this idealized framework, we find similar fingerprints in the fourth decade of hosing among the models, with a general weakening of the Atlantic Meridional Overturning Circulation (AMOC). Initially, the additional freshwater spreads along the main currents of the subpolar gyre. Part of the anomaly crosses the Atlantic eastward and enters into the Canary Current constituting a freshwater leakage tapping the subpolar gyre system. As a consequence, we show that the AMOC weakening is smaller if the leakage is larger. We argue that the magnitude of the freshwater leakage is related to the asymmetry between the subpolar-subtropical gyres in the control simulations, which may ultimately be a primary cause for the diversity of AMOC responses to the hosing in the multi-model ensemble. Another important fingerprint concerns a warming in the Nordic Seas in response to the re-emergence of Atlantic subsurface waters capped by the freshwater in the subpolar gyre. This subsurface heat anomaly reaches the Arctic where it emerges and induces a positive upper ocean salinity anomaly by introducing more Atlantic waters. We found similar climatic impacts in all the coupled ocean-atmosphere models with an atmospheric cooling of the North Atlantic except in the region around the Nordic Seas and a slight warming south of the equator in the Atlantic. This ... Article in Journal/Newspaper Arctic Greenland Ice Sheet Nordic Seas North Atlantic HAL Sorbonne Université Arctic Greenland Climate Dynamics 41 3-4 695 720 |