Response of North Atlantic Ocean Circulation to Atmospheric Weather Regimes
International audience A new framework is proposed for investigating the atmospheric forcing of North Atlantic Ocean circulation. Instead of using classical modes of variability, such as the North Atlantic Oscillation (NAO) or the east Atlantic pattern, the weather regimes paradigm was used. Using t...
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Online Access: | https://hal.science/hal-01132189 https://doi.org/10.1175/JPO-D-12-0217.1 |
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ftunivnantes:oai:HAL:hal-01132189v1 2023-05-15T17:06:13+02:00 Response of North Atlantic Ocean Circulation to Atmospheric Weather Regimes Barrier, Nicolas Cassou, Christophe Deshayes, Julie Treguier, Anne-Marie Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS) Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique - CERFACS (CERFACS) 2014-01 https://hal.science/hal-01132189 https://doi.org/10.1175/JPO-D-12-0217.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-12-0217.1 hal-01132189 https://hal.science/hal-01132189 doi:10.1175/JPO-D-12-0217.1 ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-01132189 Journal of Physical Oceanography, 2014, 44 (1), pp.179-201. ⟨10.1175/JPO-D-12-0217.1⟩ Circulation/ Dynamics Meridional overturning circulation Atm/Ocean Structure/ Phenomena Gyres North Atlantic Oscillation Wind Physical Meteorology and Climatology Climate classification/regimes Models and modeling Ocean models [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2014 ftunivnantes https://doi.org/10.1175/JPO-D-12-0217.1 2023-02-08T10:49:41Z International audience A new framework is proposed for investigating the atmospheric forcing of North Atlantic Ocean circulation. Instead of using classical modes of variability, such as the North Atlantic Oscillation (NAO) or the east Atlantic pattern, the weather regimes paradigm was used. Using this framework helped avoid problems associated with the assumptions of orthogonality and symmetry that are particular to modal analysis and known to be unsuitable for the NAO. Using ocean-only historical and sensitivity experiments, the impacts of the four winter weather regimes on horizontal and overturning circulations were investigated. The results suggest that the Atlantic Ridge (AR), negative NAO (NAO−), and positive NAO (NAO+) regimes induce a fast (monthly-to-interannual time scales) adjustment of the gyres via topographic Sverdrup dynamics and of the meridional overturning circulation via anomalous Ekman transport. The wind anomalies associated with the Scandinavian blocking regime (SBL) are ineffective in driving a fast wind-driven oceanic adjustment. The response of both gyre and overturning circulations to persistent regime conditions was also estimated. AR causes a strong, wind-driven reduction in the strengths of the subtropical and subpolar gyres, while NAO+ causes a strengthening of the subtropical gyre via wind stress curl anomalies and of the subpolar gyre via heat flux anomalies. NAO− induces a southward shift of the gyres through the southward displacement of the wind stress curl. The SBL is found to impact the subpolar gyre only via anomalous heat fluxes. The overturning circulation is shown to spin up following persistent SBL and NAO+ and to spin down following persistent AR and NAO− conditions. These responses are driven by changes in deep water formation in the Labrador Sea. Article in Journal/Newspaper Labrador Sea North Atlantic North Atlantic oscillation Université de Nantes: HAL-UNIV-NANTES Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Journal of Physical Oceanography 44 1 179 201 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Circulation/ Dynamics Meridional overturning circulation Atm/Ocean Structure/ Phenomena Gyres North Atlantic Oscillation Wind Physical Meteorology and Climatology Climate classification/regimes Models and modeling Ocean models [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Circulation/ Dynamics Meridional overturning circulation Atm/Ocean Structure/ Phenomena Gyres North Atlantic Oscillation Wind Physical Meteorology and Climatology Climate classification/regimes Models and modeling Ocean models [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Barrier, Nicolas Cassou, Christophe Deshayes, Julie Treguier, Anne-Marie Response of North Atlantic Ocean Circulation to Atmospheric Weather Regimes |
topic_facet |
Circulation/ Dynamics Meridional overturning circulation Atm/Ocean Structure/ Phenomena Gyres North Atlantic Oscillation Wind Physical Meteorology and Climatology Climate classification/regimes Models and modeling Ocean models [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience A new framework is proposed for investigating the atmospheric forcing of North Atlantic Ocean circulation. Instead of using classical modes of variability, such as the North Atlantic Oscillation (NAO) or the east Atlantic pattern, the weather regimes paradigm was used. Using this framework helped avoid problems associated with the assumptions of orthogonality and symmetry that are particular to modal analysis and known to be unsuitable for the NAO. Using ocean-only historical and sensitivity experiments, the impacts of the four winter weather regimes on horizontal and overturning circulations were investigated. The results suggest that the Atlantic Ridge (AR), negative NAO (NAO−), and positive NAO (NAO+) regimes induce a fast (monthly-to-interannual time scales) adjustment of the gyres via topographic Sverdrup dynamics and of the meridional overturning circulation via anomalous Ekman transport. The wind anomalies associated with the Scandinavian blocking regime (SBL) are ineffective in driving a fast wind-driven oceanic adjustment. The response of both gyre and overturning circulations to persistent regime conditions was also estimated. AR causes a strong, wind-driven reduction in the strengths of the subtropical and subpolar gyres, while NAO+ causes a strengthening of the subtropical gyre via wind stress curl anomalies and of the subpolar gyre via heat flux anomalies. NAO− induces a southward shift of the gyres through the southward displacement of the wind stress curl. The SBL is found to impact the subpolar gyre only via anomalous heat fluxes. The overturning circulation is shown to spin up following persistent SBL and NAO+ and to spin down following persistent AR and NAO− conditions. These responses are driven by changes in deep water formation in the Labrador Sea. |
author2 |
Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS) Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique - CERFACS (CERFACS) |
format |
Article in Journal/Newspaper |
author |
Barrier, Nicolas Cassou, Christophe Deshayes, Julie Treguier, Anne-Marie |
author_facet |
Barrier, Nicolas Cassou, Christophe Deshayes, Julie Treguier, Anne-Marie |
author_sort |
Barrier, Nicolas |
title |
Response of North Atlantic Ocean Circulation to Atmospheric Weather Regimes |
title_short |
Response of North Atlantic Ocean Circulation to Atmospheric Weather Regimes |
title_full |
Response of North Atlantic Ocean Circulation to Atmospheric Weather Regimes |
title_fullStr |
Response of North Atlantic Ocean Circulation to Atmospheric Weather Regimes |
title_full_unstemmed |
Response of North Atlantic Ocean Circulation to Atmospheric Weather Regimes |
title_sort |
response of north atlantic ocean circulation to atmospheric weather regimes |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-01132189 https://doi.org/10.1175/JPO-D-12-0217.1 |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Curl |
geographic_facet |
Curl |
genre |
Labrador Sea North Atlantic North Atlantic oscillation |
genre_facet |
Labrador Sea North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-01132189 Journal of Physical Oceanography, 2014, 44 (1), pp.179-201. ⟨10.1175/JPO-D-12-0217.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-12-0217.1 hal-01132189 https://hal.science/hal-01132189 doi:10.1175/JPO-D-12-0217.1 |
op_doi |
https://doi.org/10.1175/JPO-D-12-0217.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
44 |
container_issue |
1 |
container_start_page |
179 |
op_container_end_page |
201 |
_version_ |
1766061251457187840 |