Atmospheric forcing on the Canadian Arctic Archipelago freshwater outflow and implications for the Labrador Sea variability
International audience The variability of the freshwater export through the Canadian Arctic Archipelago (CAA) is analyzed using a hindcast simulation forced by surface atmospheric forcing from the ERA40 reanalysis (1958-2001). Although the two channels representing the archipelago in the model are b...
Published in: | Journal of Geophysical Research |
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Main Authors: | , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2011
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Online Access: | https://doi.org/10.1029/2010JC006323 https://hal.archives-ouvertes.fr/hal-00755117/file/2010JC006323.pdf https://hal.archives-ouvertes.fr/hal-00755117 |
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openpolar |
institution |
Open Polar |
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English |
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envir geo |
spellingShingle |
envir geo Houssais, Marie-Noëlle Herbaut, Christophe Atmospheric forcing on the Canadian Arctic Archipelago freshwater outflow and implications for the Labrador Sea variability |
topic_facet |
envir geo |
description |
International audience The variability of the freshwater export through the Canadian Arctic Archipelago (CAA) is analyzed using a hindcast simulation forced by surface atmospheric forcing from the ERA40 reanalysis (1958-2001). Although the two channels representing the archipelago in the model are both sensitive to the along-channel sea surface height (SSH) gradient, they appear to have very distinct behaviors. The outflow to Lancaster Sound is shown to be largely controlled by the magnitude of the upstream SSH gradient across McClure Strait. The gradient shows a close link to the wind stress curl in the western Arctic but also to a large-scale SSH anomaly pattern which has a strong signal over the shelf to the south of McClure Strait. The latter has, however, little statistical connection to the SSH variability in the Beaufort Gyre. By contrast, the outflow through Nares Strait responds preferentially to SSH variations in the northern Baffin Bay which are remotely forced by air-sea heat exchanges in the Labrador Sea. The variability is largely coherent between the two outflows and is controlled by a dipolar atmospheric pattern reminiscent of the North Atlantic/Arctic Oscillation. When entering the subpolar gyre, the CAA freshwater outflow remains confined to the Labrador shelf with little impact on the salinity of the interior Labrador Sea and potentially on the convection. The latter is represented by a distinct mode of salinity variability in the western subpolar gyre which is rather influenced by the variability of the sea ice export through Fram Strait. |
author2 |
Échanges dans la couche de surface : des pôles aux tropiques (SURF) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-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)-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 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)-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)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-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) |
format |
Article in Journal/Newspaper |
author |
Houssais, Marie-Noëlle Herbaut, Christophe |
author_facet |
Houssais, Marie-Noëlle Herbaut, Christophe |
author_sort |
Houssais, Marie-Noëlle |
title |
Atmospheric forcing on the Canadian Arctic Archipelago freshwater outflow and implications for the Labrador Sea variability |
title_short |
Atmospheric forcing on the Canadian Arctic Archipelago freshwater outflow and implications for the Labrador Sea variability |
title_full |
Atmospheric forcing on the Canadian Arctic Archipelago freshwater outflow and implications for the Labrador Sea variability |
title_fullStr |
Atmospheric forcing on the Canadian Arctic Archipelago freshwater outflow and implications for the Labrador Sea variability |
title_full_unstemmed |
Atmospheric forcing on the Canadian Arctic Archipelago freshwater outflow and implications for the Labrador Sea variability |
title_sort |
atmospheric forcing on the canadian arctic archipelago freshwater outflow and implications for the labrador sea variability |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://doi.org/10.1029/2010JC006323 https://hal.archives-ouvertes.fr/hal-00755117/file/2010JC006323.pdf https://hal.archives-ouvertes.fr/hal-00755117 |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) ENVELOPE(-58.000,-58.000,56.000,56.000) ENVELOPE(-83.999,-83.999,74.218,74.218) ENVELOPE(158.167,158.167,-81.450,-81.450) |
geographic |
Arctic Baffin Bay Canadian Arctic Archipelago Curl Labrador Shelf Lancaster Sound Nares |
geographic_facet |
Arctic Baffin Bay Canadian Arctic Archipelago Curl Labrador Shelf Lancaster Sound Nares |
genre |
Arctic Archipelago Arctic Atlantic Arctic Atlantic-Arctic Baffin Bay Baffin Bay Baffin Canadian Arctic Archipelago Fram Strait Labrador Sea Lancaster Sound Nares strait North Atlantic Sea ice |
genre_facet |
Arctic Archipelago Arctic Atlantic Arctic Atlantic-Arctic Baffin Bay Baffin Bay Baffin Canadian Arctic Archipelago Fram Strait Labrador Sea Lancaster Sound Nares strait North Atlantic Sea ice |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research Journal of Geophysical Research, American Geophysical Union, 2011, 116, pp.C00D02. ⟨10.1029/2010JC006323⟩ |
op_relation |
hal-00755117 BIBCODE: 2011JGRC.11600D02H doi:10.1029/2010JC006323 WOS: 000288329100001 10670/1.nixkev https://hal.archives-ouvertes.fr/hal-00755117/file/2010JC006323.pdf https://hal.archives-ouvertes.fr/hal-00755117 |
op_doi |
https://doi.org/10.1029/2010JC006323 |
container_title |
Journal of Geophysical Research |
container_volume |
116 |
_version_ |
1766302915168829440 |
spelling |
fttriple:oai:gotriple.eu:10670/1.nixkev 2023-05-15T14:28:45+02:00 Atmospheric forcing on the Canadian Arctic Archipelago freshwater outflow and implications for the Labrador Sea variability Houssais, Marie-Noëlle Herbaut, Christophe Échanges dans la couche de surface : des pôles aux tropiques (SURF) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-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)-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 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)-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)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-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) 2011-03-01 https://doi.org/10.1029/2010JC006323 https://hal.archives-ouvertes.fr/hal-00755117/file/2010JC006323.pdf https://hal.archives-ouvertes.fr/hal-00755117 en eng HAL CCSD American Geophysical Union hal-00755117 BIBCODE: 2011JGRC.11600D02H doi:10.1029/2010JC006323 WOS: 000288329100001 10670/1.nixkev https://hal.archives-ouvertes.fr/hal-00755117/file/2010JC006323.pdf https://hal.archives-ouvertes.fr/hal-00755117 Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research Journal of Geophysical Research, American Geophysical Union, 2011, 116, pp.C00D02. ⟨10.1029/2010JC006323⟩ envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2011 fttriple https://doi.org/10.1029/2010JC006323 2023-01-22T17:09:17Z International audience The variability of the freshwater export through the Canadian Arctic Archipelago (CAA) is analyzed using a hindcast simulation forced by surface atmospheric forcing from the ERA40 reanalysis (1958-2001). Although the two channels representing the archipelago in the model are both sensitive to the along-channel sea surface height (SSH) gradient, they appear to have very distinct behaviors. The outflow to Lancaster Sound is shown to be largely controlled by the magnitude of the upstream SSH gradient across McClure Strait. The gradient shows a close link to the wind stress curl in the western Arctic but also to a large-scale SSH anomaly pattern which has a strong signal over the shelf to the south of McClure Strait. The latter has, however, little statistical connection to the SSH variability in the Beaufort Gyre. By contrast, the outflow through Nares Strait responds preferentially to SSH variations in the northern Baffin Bay which are remotely forced by air-sea heat exchanges in the Labrador Sea. The variability is largely coherent between the two outflows and is controlled by a dipolar atmospheric pattern reminiscent of the North Atlantic/Arctic Oscillation. When entering the subpolar gyre, the CAA freshwater outflow remains confined to the Labrador shelf with little impact on the salinity of the interior Labrador Sea and potentially on the convection. The latter is represented by a distinct mode of salinity variability in the western subpolar gyre which is rather influenced by the variability of the sea ice export through Fram Strait. Article in Journal/Newspaper Arctic Archipelago Arctic Atlantic Arctic Atlantic-Arctic Baffin Bay Baffin Bay Baffin Canadian Arctic Archipelago Fram Strait Labrador Sea Lancaster Sound Nares strait North Atlantic Sea ice Unknown Arctic Baffin Bay Canadian Arctic Archipelago Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Labrador Shelf ENVELOPE(-58.000,-58.000,56.000,56.000) Lancaster Sound ENVELOPE(-83.999,-83.999,74.218,74.218) Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Journal of Geophysical Research 116 |