Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean meridional overturning circulation
International audience The meridional overturning circulation (MOC) in the Southern Ocean is investigated using hydrographic observations combined with satellite measurements of sea surface height. A three-dimensional (spatial and vertical) estimate of the isopycnal eddy diffusivity in the Southern...
Published in: | Journal of Physical Oceanography |
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Main Authors: | , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2017
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Online Access: | https://hal.science/hal-01629759 https://hal.science/hal-01629759/document https://hal.science/hal-01629759/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Isopycnal%20Mixing%20Suppression%20by%20the%20Antarctic%20Circumpolar%20Current%20and%20the%20Southern%20Ocean%20Meridional%20Overturning%20Circulation.pdf https://doi.org/10.1175/JPO-D-16-0263.1 |
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ftuniparissaclay:oai:HAL:hal-01629759v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Archives ouvertes de Paris-Saclay |
op_collection_id |
ftuniparissaclay |
language |
English |
topic |
Southern Ocean Meridional overturning circulation In situ oceanic observations Satellite observations Isopycnal coordinates [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
Southern Ocean Meridional overturning circulation In situ oceanic observations Satellite observations Isopycnal coordinates [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Chapman, Christopher C. Sallée, Jean-Baptiste Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean meridional overturning circulation |
topic_facet |
Southern Ocean Meridional overturning circulation In situ oceanic observations Satellite observations Isopycnal coordinates [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience The meridional overturning circulation (MOC) in the Southern Ocean is investigated using hydrographic observations combined with satellite measurements of sea surface height. A three-dimensional (spatial and vertical) estimate of the isopycnal eddy diffusivity in the Southern Ocean is obtained using the theory of Ferrari and Nikurashin that includes the influence of suppression of the diffusivity by the strong, time-mean flows. It is found that the eddy diffusivity is enhanced at depth, reaching a maximum at the critical layer near 1000 m. The estimate of diffusivity is used with a simple diffusive parameterization to estimate the meridional eddy volume flux. This estimate of eddy volume flux is combined with an estimate of the Ekman transport to reconstruct the time-mean overturning circulation. By comparing the reconstruction with, and without, suppression of the eddy diffusivity by the mean flow, the influence of the suppression on the overturning is illuminated. It is shown that the suppression of the eddy diffusivity results in a large reduction of interior eddy transports and a more realistic eddy-induced overturning circulation. Finally, a simple conceptual model is used to show that the MOC is influenced not only by the existence of enhanced diffusivity at depth but also by the details of the vertical structure of the eddy diffusivity, such as the depth of the critical layer. |
author2 |
Processus de couplage à Petite Echelle, Ecosystèmes et Prédateurs Supérieurs (PEPS) 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)-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)) 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) ANR-12-PDOC-0001,EXCITING,Explorer la structure tri-dimensionnelle de la circulation d'overturning de l'Océan Austral, et son impact sur le puits de carbone océanique(2012) |
format |
Article in Journal/Newspaper |
author |
Chapman, Christopher C. Sallée, Jean-Baptiste |
author_facet |
Chapman, Christopher C. Sallée, Jean-Baptiste |
author_sort |
Chapman, Christopher C. |
title |
Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean meridional overturning circulation |
title_short |
Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean meridional overturning circulation |
title_full |
Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean meridional overturning circulation |
title_fullStr |
Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean meridional overturning circulation |
title_full_unstemmed |
Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean meridional overturning circulation |
title_sort |
isopycnal mixing suppression by the antarctic circumpolar current and the southern ocean meridional overturning circulation |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-01629759 https://hal.science/hal-01629759/document https://hal.science/hal-01629759/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Isopycnal%20Mixing%20Suppression%20by%20the%20Antarctic%20Circumpolar%20Current%20and%20the%20Southern%20Ocean%20Meridional%20Overturning%20Circulation.pdf https://doi.org/10.1175/JPO-D-16-0263.1 |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-01629759 Journal of Physical Oceanography, 2017, 47 (8), pp.2023 - 2045. ⟨10.1175/JPO-D-16-0263.1⟩ http://journals.ametsoc.org/doi/10.1175/JPO-D-16-0263.1 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-16-0263.1 hal-01629759 https://hal.science/hal-01629759 https://hal.science/hal-01629759/document https://hal.science/hal-01629759/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Isopycnal%20Mixing%20Suppression%20by%20the%20Antarctic%20Circumpolar%20Current%20and%20the%20Southern%20Ocean%20Meridional%20Overturning%20Circulation.pdf doi:10.1175/JPO-D-16-0263.1 WOS: 000407420500008 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JPO-D-16-0263.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
47 |
container_issue |
8 |
container_start_page |
2023 |
op_container_end_page |
2045 |
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1799468832620806144 |
spelling |
ftuniparissaclay:oai:HAL:hal-01629759v1 2024-05-19T07:30:59+00:00 Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean meridional overturning circulation Chapman, Christopher C. Sallée, Jean-Baptiste Processus de couplage à Petite Echelle, Ecosystèmes et Prédateurs Supérieurs (PEPS) 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)-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)) 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) ANR-12-PDOC-0001,EXCITING,Explorer la structure tri-dimensionnelle de la circulation d'overturning de l'Océan Austral, et son impact sur le puits de carbone océanique(2012) 2017-08 https://hal.science/hal-01629759 https://hal.science/hal-01629759/document https://hal.science/hal-01629759/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Isopycnal%20Mixing%20Suppression%20by%20the%20Antarctic%20Circumpolar%20Current%20and%20the%20Southern%20Ocean%20Meridional%20Overturning%20Circulation.pdf https://doi.org/10.1175/JPO-D-16-0263.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-16-0263.1 hal-01629759 https://hal.science/hal-01629759 https://hal.science/hal-01629759/document https://hal.science/hal-01629759/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Isopycnal%20Mixing%20Suppression%20by%20the%20Antarctic%20Circumpolar%20Current%20and%20the%20Southern%20Ocean%20Meridional%20Overturning%20Circulation.pdf doi:10.1175/JPO-D-16-0263.1 WOS: 000407420500008 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-01629759 Journal of Physical Oceanography, 2017, 47 (8), pp.2023 - 2045. ⟨10.1175/JPO-D-16-0263.1⟩ http://journals.ametsoc.org/doi/10.1175/JPO-D-16-0263.1 Southern Ocean Meridional overturning circulation In situ oceanic observations Satellite observations Isopycnal coordinates [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2017 ftuniparissaclay https://doi.org/10.1175/JPO-D-16-0263.1 2024-04-22T17:33:22Z International audience The meridional overturning circulation (MOC) in the Southern Ocean is investigated using hydrographic observations combined with satellite measurements of sea surface height. A three-dimensional (spatial and vertical) estimate of the isopycnal eddy diffusivity in the Southern Ocean is obtained using the theory of Ferrari and Nikurashin that includes the influence of suppression of the diffusivity by the strong, time-mean flows. It is found that the eddy diffusivity is enhanced at depth, reaching a maximum at the critical layer near 1000 m. The estimate of diffusivity is used with a simple diffusive parameterization to estimate the meridional eddy volume flux. This estimate of eddy volume flux is combined with an estimate of the Ekman transport to reconstruct the time-mean overturning circulation. By comparing the reconstruction with, and without, suppression of the eddy diffusivity by the mean flow, the influence of the suppression on the overturning is illuminated. It is shown that the suppression of the eddy diffusivity results in a large reduction of interior eddy transports and a more realistic eddy-induced overturning circulation. Finally, a simple conceptual model is used to show that the MOC is influenced not only by the existence of enhanced diffusivity at depth but also by the details of the vertical structure of the eddy diffusivity, such as the depth of the critical layer. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archives ouvertes de Paris-Saclay Journal of Physical Oceanography 47 8 2023 2045 |