Observing the Local Emergence of the Southern Ocean Residual-Mean Circulation
International audience The role of mesoscale turbulence in maintaining the mean buoyancy structure and overturning circulation of the Southern Ocean is investigated through a 2‐year‐long, single‐mooring record of measurements in Drake Passage. The buoyancy budget of the area is successively assessed...
Published in: | Geophysical Research Letters |
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Online Access: | https://hal.science/hal-02136451 https://hal.science/hal-02136451/document https://hal.science/hal-02136451/file/manuscript.pdf https://doi.org/10.1029/2018GL081382 |
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ftinsu:oai:HAL:hal-02136451v1 2024-04-14T08:04:28+00:00 Observing the Local Emergence of the Southern Ocean Residual-Mean Circulation Sevellec, F. Naveira Garabato, A. Vic, C. Ducousso, N. 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) Ocean and Earth Science Southampton University of Southampton-National Oceanography Centre (NOC) 2019 https://hal.science/hal-02136451 https://hal.science/hal-02136451/document https://hal.science/hal-02136451/file/manuscript.pdf https://doi.org/10.1029/2018GL081382 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2018GL081382 hal-02136451 https://hal.science/hal-02136451 https://hal.science/hal-02136451/document https://hal.science/hal-02136451/file/manuscript.pdf doi:10.1029/2018GL081382 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-02136451 Geophysical Research Letters, 2019, 46 (7), pp.3862-3870. ⟨10.1029/2018GL081382⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2019 ftinsu https://doi.org/10.1029/2018GL081382 2024-03-21T17:21:10Z International audience The role of mesoscale turbulence in maintaining the mean buoyancy structure and overturning circulation of the Southern Ocean is investigated through a 2‐year‐long, single‐mooring record of measurements in Drake Passage. The buoyancy budget of the area is successively assessed within the Eulerian and the Temporal‐Residual‐Mean frameworks. We find that a regime change occurs on time scales of 1 to 100 days, characteristic of mesoscale dynamics, whereby the eddy‐induced turbulent horizontal advection balances the vertical buoyancy advection by the mean flow. We use these diagnostics to reconstruct the region's overturning circulation, which is found to entail an equatorward downwelling of Antarctic Intermediate and Bottom Waters and a poleward upwelling of Circumpolar Deep Water. The estimated eddy‐induced flow can be accurately parameterized via the Gent‐McWilliams closure by adopting a diffusivity of ∼2,000 m2 s−1 with a middepth increase to 2,500 m2 s−1 at 2,100 m, immediately underneath the maximum interior stratification. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Antarctic Drake Passage Southern Ocean Geophysical Research Letters 46 7 3862 3870 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Sevellec, F. Naveira Garabato, A. Vic, C. Ducousso, N. Observing the Local Emergence of the Southern Ocean Residual-Mean Circulation |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The role of mesoscale turbulence in maintaining the mean buoyancy structure and overturning circulation of the Southern Ocean is investigated through a 2‐year‐long, single‐mooring record of measurements in Drake Passage. The buoyancy budget of the area is successively assessed within the Eulerian and the Temporal‐Residual‐Mean frameworks. We find that a regime change occurs on time scales of 1 to 100 days, characteristic of mesoscale dynamics, whereby the eddy‐induced turbulent horizontal advection balances the vertical buoyancy advection by the mean flow. We use these diagnostics to reconstruct the region's overturning circulation, which is found to entail an equatorward downwelling of Antarctic Intermediate and Bottom Waters and a poleward upwelling of Circumpolar Deep Water. The estimated eddy‐induced flow can be accurately parameterized via the Gent‐McWilliams closure by adopting a diffusivity of ∼2,000 m2 s−1 with a middepth increase to 2,500 m2 s−1 at 2,100 m, immediately underneath the maximum interior stratification. |
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) Ocean and Earth Science Southampton University of Southampton-National Oceanography Centre (NOC) |
format |
Article in Journal/Newspaper |
author |
Sevellec, F. Naveira Garabato, A. Vic, C. Ducousso, N. |
author_facet |
Sevellec, F. Naveira Garabato, A. Vic, C. Ducousso, N. |
author_sort |
Sevellec, F. |
title |
Observing the Local Emergence of the Southern Ocean Residual-Mean Circulation |
title_short |
Observing the Local Emergence of the Southern Ocean Residual-Mean Circulation |
title_full |
Observing the Local Emergence of the Southern Ocean Residual-Mean Circulation |
title_fullStr |
Observing the Local Emergence of the Southern Ocean Residual-Mean Circulation |
title_full_unstemmed |
Observing the Local Emergence of the Southern Ocean Residual-Mean Circulation |
title_sort |
observing the local emergence of the southern ocean residual-mean circulation |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02136451 https://hal.science/hal-02136451/document https://hal.science/hal-02136451/file/manuscript.pdf https://doi.org/10.1029/2018GL081382 |
geographic |
Antarctic Drake Passage Southern Ocean |
geographic_facet |
Antarctic Drake Passage Southern Ocean |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-02136451 Geophysical Research Letters, 2019, 46 (7), pp.3862-3870. ⟨10.1029/2018GL081382⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2018GL081382 hal-02136451 https://hal.science/hal-02136451 https://hal.science/hal-02136451/document https://hal.science/hal-02136451/file/manuscript.pdf doi:10.1029/2018GL081382 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2018GL081382 |
container_title |
Geophysical Research Letters |
container_volume |
46 |
container_issue |
7 |
container_start_page |
3862 |
op_container_end_page |
3870 |
_version_ |
1796300994259189760 |