Summertime modification of surface fronts in the North Atlantic subpolar gyre
International audience A 12-yearlong thermosalinograph data set from ships of opportunity was used to make an extensive study of meso-scale surface fronts in the western part of the North Atlantic subpolar gyre from 1997 to 2009. Fronts are identified on a sea-surface-salinity/sea surface temperatur...
Published in: | Journal of Geophysical Research |
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Main Authors: | , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2011
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-00753868 https://hal.archives-ouvertes.fr/hal-00753868/document https://hal.archives-ouvertes.fr/hal-00753868/file/2011JC006950.pdf https://doi.org/10.1029/2011JC006950 |
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ftccsdartic:oai:HAL:hal-00753868v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes Desprès, Agnès Reverdin, Gilles D'Ovidio, Francesco Summertime modification of surface fronts in the North Atlantic subpolar gyre |
topic_facet |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience A 12-yearlong thermosalinograph data set from ships of opportunity was used to make an extensive study of meso-scale surface fronts in the western part of the North Atlantic subpolar gyre from 1997 to 2009. Fronts are identified on a sea-surface-salinity/sea surface temperature gradient criterion with a typical width of 20 to 60 km. The seasonal hydrographic properties of fronts are investigated. We find that, whereas salinity jumps across fronts are close to the larger scale variations, the temperature jumps across fronts are often smaller than the larger scale variations, in particular in summer-time. We also find in June vertical profiles that the relative weight of temperature over salinity in the density jump across fronts is smaller at the surface than at depth. A Lagrangian model based on altimetry data and in situ vertical hydrographic profiles indicates that surface stirring is able to create fronts, but not the contrast between temperature and salinity gradients. We suggest that air-sea fluxes, mostly heat fluxes, but possibly also differential vertical stirring, are responsible for damping the meso-scale horizontal surface temperature gradient. This is supported by an eddy-permitting numerical simulation of this region (DRAKKAR simulation ORCA-025-G70) which includes some heat flux feedbacks. |
author2 |
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) Échanges dans la couche de surface : des pôles aux tropiques (SURF) 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)) Couplage physique-biogéochimie-carbone (PHYBIOCAR) INSU grants (OVIDE, SURATLANT) ANR-09-BLAN-0365,redhots,Reconstruction de la Dynamique Haute résolution Océanique Tridimensionnelle des couches Supérieures(2009) |
format |
Article in Journal/Newspaper |
author |
Desprès, Agnès Reverdin, Gilles D'Ovidio, Francesco |
author_facet |
Desprès, Agnès Reverdin, Gilles D'Ovidio, Francesco |
author_sort |
Desprès, Agnès |
title |
Summertime modification of surface fronts in the North Atlantic subpolar gyre |
title_short |
Summertime modification of surface fronts in the North Atlantic subpolar gyre |
title_full |
Summertime modification of surface fronts in the North Atlantic subpolar gyre |
title_fullStr |
Summertime modification of surface fronts in the North Atlantic subpolar gyre |
title_full_unstemmed |
Summertime modification of surface fronts in the North Atlantic subpolar gyre |
title_sort |
summertime modification of surface fronts in the north atlantic subpolar gyre |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.archives-ouvertes.fr/hal-00753868 https://hal.archives-ouvertes.fr/hal-00753868/document https://hal.archives-ouvertes.fr/hal-00753868/file/2011JC006950.pdf https://doi.org/10.1029/2011JC006950 |
genre |
North Atlantic Orca |
genre_facet |
North Atlantic Orca |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.archives-ouvertes.fr/hal-00753868 Journal of Geophysical Research, American Geophysical Union, 2011, 116, pp.10003. ⟨10.1029/2011JC006950⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2011JC006950 hal-00753868 https://hal.archives-ouvertes.fr/hal-00753868 https://hal.archives-ouvertes.fr/hal-00753868/document https://hal.archives-ouvertes.fr/hal-00753868/file/2011JC006950.pdf BIBCODE: 2011JGRC.11610003D doi:10.1029/2011JC006950 WOS: 000295825900002 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2011JC006950 |
container_title |
Journal of Geophysical Research |
container_volume |
116 |
container_issue |
C10 |
_version_ |
1766127924270858240 |
spelling |
ftccsdartic:oai:HAL:hal-00753868v1 2023-05-15T17:30:50+02:00 Summertime modification of surface fronts in the North Atlantic subpolar gyre Desprès, Agnès Reverdin, Gilles D'Ovidio, Francesco 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) Échanges dans la couche de surface : des pôles aux tropiques (SURF) 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)) Couplage physique-biogéochimie-carbone (PHYBIOCAR) INSU grants (OVIDE, SURATLANT) ANR-09-BLAN-0365,redhots,Reconstruction de la Dynamique Haute résolution Océanique Tridimensionnelle des couches Supérieures(2009) 2011-10 https://hal.archives-ouvertes.fr/hal-00753868 https://hal.archives-ouvertes.fr/hal-00753868/document https://hal.archives-ouvertes.fr/hal-00753868/file/2011JC006950.pdf https://doi.org/10.1029/2011JC006950 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2011JC006950 hal-00753868 https://hal.archives-ouvertes.fr/hal-00753868 https://hal.archives-ouvertes.fr/hal-00753868/document https://hal.archives-ouvertes.fr/hal-00753868/file/2011JC006950.pdf BIBCODE: 2011JGRC.11610003D doi:10.1029/2011JC006950 WOS: 000295825900002 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.archives-ouvertes.fr/hal-00753868 Journal of Geophysical Research, American Geophysical Union, 2011, 116, pp.10003. ⟨10.1029/2011JC006950⟩ [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2011 ftccsdartic https://doi.org/10.1029/2011JC006950 2021-12-04T23:47:29Z International audience A 12-yearlong thermosalinograph data set from ships of opportunity was used to make an extensive study of meso-scale surface fronts in the western part of the North Atlantic subpolar gyre from 1997 to 2009. Fronts are identified on a sea-surface-salinity/sea surface temperature gradient criterion with a typical width of 20 to 60 km. The seasonal hydrographic properties of fronts are investigated. We find that, whereas salinity jumps across fronts are close to the larger scale variations, the temperature jumps across fronts are often smaller than the larger scale variations, in particular in summer-time. We also find in June vertical profiles that the relative weight of temperature over salinity in the density jump across fronts is smaller at the surface than at depth. A Lagrangian model based on altimetry data and in situ vertical hydrographic profiles indicates that surface stirring is able to create fronts, but not the contrast between temperature and salinity gradients. We suggest that air-sea fluxes, mostly heat fluxes, but possibly also differential vertical stirring, are responsible for damping the meso-scale horizontal surface temperature gradient. This is supported by an eddy-permitting numerical simulation of this region (DRAKKAR simulation ORCA-025-G70) which includes some heat flux feedbacks. Article in Journal/Newspaper North Atlantic Orca Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Journal of Geophysical Research 116 C10 |