Poleward propagation of spiciness anomalies in the North Atlantic Ocean

Recent modelling results suggest that subsurface salinity anomalies propagating from the tropics can reach and precondition the deep-water formation regions, thus modulating the THC variability. The forcing and propagative aspects of this mechanism are presented in the North Atlantic Ocean over 1948...

Full description

Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Laurian, Audine, Lazar, Alban, Reverdin, Gilles, Rodgers, Keith B., Terray, Pascal
Other Authors: 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)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2006
Subjects:
Online Access:https://hal.science/hal-00122348
https://hal.science/hal-00122348/document
https://hal.science/hal-00122348/file/2006GL026155.pdf
https://doi.org/10.1029/2006GL026155
id ftuniversailles:oai:HAL:hal-00122348v1
record_format openpolar
spelling ftuniversailles:oai:HAL:hal-00122348v1 2024-05-19T07:44:46+00:00 Poleward propagation of spiciness anomalies in the North Atlantic Ocean Laurian, Audine Lazar, Alban Reverdin, Gilles Rodgers, Keith B. Terray, Pascal 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) 2006 https://hal.science/hal-00122348 https://hal.science/hal-00122348/document https://hal.science/hal-00122348/file/2006GL026155.pdf https://doi.org/10.1029/2006GL026155 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GL026155 hal-00122348 https://hal.science/hal-00122348 https://hal.science/hal-00122348/document https://hal.science/hal-00122348/file/2006GL026155.pdf doi:10.1029/2006GL026155 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-00122348 Geophysical Research Letters, 2006, 33 (13), pp.L13603. ⟨10.1029/2006GL026155⟩ [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2006 ftuniversailles https://doi.org/10.1029/2006GL026155 2024-04-25T00:26:17Z Recent modelling results suggest that subsurface salinity anomalies propagating from the tropics can reach and precondition the deep-water formation regions, thus modulating the THC variability. The forcing and propagative aspects of this mechanism are presented in the North Atlantic Ocean over 1948–2002 using an OGCM. Density compensated salinity anomalies of 0.1 up to 0.35 psu along σ = 26 kg.m−3 are generated in the salinity maximum region at interannual to decadal frequency. The relation between subsurface conditions and late winter sea surface salinity variability supports the subduction mechanism. They circulate over isopycnals ranging from 25.6σ to 26.2σ at current speed between 150 m and 250 m depth toward Cape Hatteras via the Gulf of Mexico on a typical 6-year transit. Although mixing along the pathway reduces the amplitude of salinity anomalies by about 66%, they largely determine the subsurface spiciness of the Gulf Stream up to 30°N, upstream of the outcrop region. Article in Journal/Newspaper North Atlantic Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Geophysical Research Letters 33 13
institution Open Polar
collection Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
op_collection_id ftuniversailles
language English
topic [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
spellingShingle [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
Laurian, Audine
Lazar, Alban
Reverdin, Gilles
Rodgers, Keith B.
Terray, Pascal
Poleward propagation of spiciness anomalies in the North Atlantic Ocean
topic_facet [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
description Recent modelling results suggest that subsurface salinity anomalies propagating from the tropics can reach and precondition the deep-water formation regions, thus modulating the THC variability. The forcing and propagative aspects of this mechanism are presented in the North Atlantic Ocean over 1948–2002 using an OGCM. Density compensated salinity anomalies of 0.1 up to 0.35 psu along σ = 26 kg.m−3 are generated in the salinity maximum region at interannual to decadal frequency. The relation between subsurface conditions and late winter sea surface salinity variability supports the subduction mechanism. They circulate over isopycnals ranging from 25.6σ to 26.2σ at current speed between 150 m and 250 m depth toward Cape Hatteras via the Gulf of Mexico on a typical 6-year transit. Although mixing along the pathway reduces the amplitude of salinity anomalies by about 66%, they largely determine the subsurface spiciness of the Gulf Stream up to 30°N, upstream of the outcrop region.
author2 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)
format Article in Journal/Newspaper
author Laurian, Audine
Lazar, Alban
Reverdin, Gilles
Rodgers, Keith B.
Terray, Pascal
author_facet Laurian, Audine
Lazar, Alban
Reverdin, Gilles
Rodgers, Keith B.
Terray, Pascal
author_sort Laurian, Audine
title Poleward propagation of spiciness anomalies in the North Atlantic Ocean
title_short Poleward propagation of spiciness anomalies in the North Atlantic Ocean
title_full Poleward propagation of spiciness anomalies in the North Atlantic Ocean
title_fullStr Poleward propagation of spiciness anomalies in the North Atlantic Ocean
title_full_unstemmed Poleward propagation of spiciness anomalies in the North Atlantic Ocean
title_sort poleward propagation of spiciness anomalies in the north atlantic ocean
publisher HAL CCSD
publishDate 2006
url https://hal.science/hal-00122348
https://hal.science/hal-00122348/document
https://hal.science/hal-00122348/file/2006GL026155.pdf
https://doi.org/10.1029/2006GL026155
genre North Atlantic
genre_facet North Atlantic
op_source ISSN: 0094-8276
EISSN: 1944-8007
Geophysical Research Letters
https://hal.science/hal-00122348
Geophysical Research Letters, 2006, 33 (13), pp.L13603. ⟨10.1029/2006GL026155⟩
op_relation info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GL026155
hal-00122348
https://hal.science/hal-00122348
https://hal.science/hal-00122348/document
https://hal.science/hal-00122348/file/2006GL026155.pdf
doi:10.1029/2006GL026155
op_rights http://hal.archives-ouvertes.fr/licences/copyright/
info:eu-repo/semantics/OpenAccess
op_doi https://doi.org/10.1029/2006GL026155
container_title Geophysical Research Letters
container_volume 33
container_issue 13
_version_ 1799484620226428928