Barotropic vorticity balance of the North Atlantic subpolar gyre in an eddy-resolving model
International audience The circulation in the North Atlantic subpolar gyre is complex and strongly influenced by the topography. The gyre dynamics are traditionally understood as the result of a topographic Sverdrup balance, which corresponds to a first-order balance between the planetary vorticity...
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2020
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Online Access: | https://hal.science/hal-02933376 https://hal.science/hal-02933376/document https://hal.science/hal-02933376/file/os-16-451-2020.pdf https://doi.org/10.5194/os-16-451-2020 |
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ftanrparis:oai:HAL:hal-02933376v1 2023-12-17T10:46:12+01:00 Barotropic vorticity balance of the North Atlantic subpolar gyre in an eddy-resolving model Le Corre, Mathieu Gula, Jonathan Tréguier, Anne-Marie Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) UBO Region Bretagne through ISblue Interdisciplinary graduate school for the blue planet ANR-17-EURE-0015 ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) 2020 https://hal.science/hal-02933376 https://hal.science/hal-02933376/document https://hal.science/hal-02933376/file/os-16-451-2020.pdf https://doi.org/10.5194/os-16-451-2020 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/os-16-451-2020 hal-02933376 https://hal.science/hal-02933376 https://hal.science/hal-02933376/document https://hal.science/hal-02933376/file/os-16-451-2020.pdf doi:10.5194/os-16-451-2020 info:eu-repo/semantics/OpenAccess ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-02933376 Ocean Science, 2020, 16 (2), pp.451-468. ⟨10.5194/os-16-451-2020⟩ [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology info:eu-repo/semantics/article Journal articles 2020 ftanrparis https://doi.org/10.5194/os-16-451-2020 2023-11-18T22:34:47Z International audience The circulation in the North Atlantic subpolar gyre is complex and strongly influenced by the topography. The gyre dynamics are traditionally understood as the result of a topographic Sverdrup balance, which corresponds to a first-order balance between the planetary vorticity advection, the bottom pressure torque, and the wind stress curl. However, these dynamics have been studied mostly with noneddy-resolving models and a crude representation of the bottom topography. Here we revisit the barotropic vorticity balance of the North Atlantic subpolar gyre using a new eddy-resolving simulation (with a grid space of approximate to 2 km) with topography-following vertical coordinates to better represent the mesoscale turbulence and flow-topography interactions. Our findings highlight that, locally, there is a first-order balance between the bottom pressure torque and the nonlinear terms, albeit with a high degree of cancellation between them. However, balances integrated over different regions of the gyre - shelf, slope, and interior - still highlight the important role played by nonlinearities and bottom drag curls. In particular, the Sverdrup balance cannot describe the dynamics in the interior of the gyre. The main sources of cyclonic vorticity are nonlinear terms due to eddies generated along eastern boundary currents and time-mean nonlinear terms in the northwest corner. Our results suggest that a good representation of the mesoscale activity and a good positioning of mean currents are two important conditions for a better representation of the circulation in the North Atlantic subpolar gyre. Article in Journal/Newspaper North Atlantic Portail HAL-ANR (Agence Nationale de la Recherche) Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Ocean Science 16 2 451 468 |
institution |
Open Polar |
collection |
Portail HAL-ANR (Agence Nationale de la Recherche) |
op_collection_id |
ftanrparis |
language |
English |
topic |
[SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
spellingShingle |
[SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology Le Corre, Mathieu Gula, Jonathan Tréguier, Anne-Marie Barotropic vorticity balance of the North Atlantic subpolar gyre in an eddy-resolving model |
topic_facet |
[SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
description |
International audience The circulation in the North Atlantic subpolar gyre is complex and strongly influenced by the topography. The gyre dynamics are traditionally understood as the result of a topographic Sverdrup balance, which corresponds to a first-order balance between the planetary vorticity advection, the bottom pressure torque, and the wind stress curl. However, these dynamics have been studied mostly with noneddy-resolving models and a crude representation of the bottom topography. Here we revisit the barotropic vorticity balance of the North Atlantic subpolar gyre using a new eddy-resolving simulation (with a grid space of approximate to 2 km) with topography-following vertical coordinates to better represent the mesoscale turbulence and flow-topography interactions. Our findings highlight that, locally, there is a first-order balance between the bottom pressure torque and the nonlinear terms, albeit with a high degree of cancellation between them. However, balances integrated over different regions of the gyre - shelf, slope, and interior - still highlight the important role played by nonlinearities and bottom drag curls. In particular, the Sverdrup balance cannot describe the dynamics in the interior of the gyre. The main sources of cyclonic vorticity are nonlinear terms due to eddies generated along eastern boundary currents and time-mean nonlinear terms in the northwest corner. Our results suggest that a good representation of the mesoscale activity and a good positioning of mean currents are two important conditions for a better representation of the circulation in the North Atlantic subpolar gyre. |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) UBO Region Bretagne through ISblue Interdisciplinary graduate school for the blue planet ANR-17-EURE-0015 ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) |
format |
Article in Journal/Newspaper |
author |
Le Corre, Mathieu Gula, Jonathan Tréguier, Anne-Marie |
author_facet |
Le Corre, Mathieu Gula, Jonathan Tréguier, Anne-Marie |
author_sort |
Le Corre, Mathieu |
title |
Barotropic vorticity balance of the North Atlantic subpolar gyre in an eddy-resolving model |
title_short |
Barotropic vorticity balance of the North Atlantic subpolar gyre in an eddy-resolving model |
title_full |
Barotropic vorticity balance of the North Atlantic subpolar gyre in an eddy-resolving model |
title_fullStr |
Barotropic vorticity balance of the North Atlantic subpolar gyre in an eddy-resolving model |
title_full_unstemmed |
Barotropic vorticity balance of the North Atlantic subpolar gyre in an eddy-resolving model |
title_sort |
barotropic vorticity balance of the north atlantic subpolar gyre in an eddy-resolving model |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02933376 https://hal.science/hal-02933376/document https://hal.science/hal-02933376/file/os-16-451-2020.pdf https://doi.org/10.5194/os-16-451-2020 |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Curl |
geographic_facet |
Curl |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-02933376 Ocean Science, 2020, 16 (2), pp.451-468. ⟨10.5194/os-16-451-2020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/os-16-451-2020 hal-02933376 https://hal.science/hal-02933376 https://hal.science/hal-02933376/document https://hal.science/hal-02933376/file/os-16-451-2020.pdf doi:10.5194/os-16-451-2020 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/os-16-451-2020 |
container_title |
Ocean Science |
container_volume |
16 |
container_issue |
2 |
container_start_page |
451 |
op_container_end_page |
468 |
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1785569576629567488 |