Indo-Atlantic Exchange, Mesoscale Dynamics, and Antarctic Intermediate Water
International audience This study evaluates the capability of eddy-permitting regional ocean models to reproduce the interocean exchange south of Africa. In this highly turbulent region, we show that the vertical structure of the horizontal flows need to be appropriately resolved to realistically ad...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://hal.science/hal-03658685 https://hal.science/hal-03658685/document https://hal.science/hal-03658685/file/JGR%20Oceans%20-%202018%20-%20Capuano%20-%20Indo%25u2010Atlantic%20Exchange%20Mesoscale%20Dynamics%20and%20Antarctic%20Intermediate%20Water.pdf https://doi.org/10.1002/2017JC013521 |
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ftccsdartic:oai:HAL:hal-03658685v1 2024-02-11T09:57:46+01:00 Indo-Atlantic Exchange, Mesoscale Dynamics, and Antarctic Intermediate Water Capuano, Tonia Astrid Speich, Sabrina Carton, Xavier Laxenaire, Remi Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) 2018 https://hal.science/hal-03658685 https://hal.science/hal-03658685/document https://hal.science/hal-03658685/file/JGR%20Oceans%20-%202018%20-%20Capuano%20-%20Indo%25u2010Atlantic%20Exchange%20Mesoscale%20Dynamics%20and%20Antarctic%20Intermediate%20Water.pdf https://doi.org/10.1002/2017JC013521 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1002/2017JC013521 hal-03658685 https://hal.science/hal-03658685 https://hal.science/hal-03658685/document https://hal.science/hal-03658685/file/JGR%20Oceans%20-%202018%20-%20Capuano%20-%20Indo%25u2010Atlantic%20Exchange%20Mesoscale%20Dynamics%20and%20Antarctic%20Intermediate%20Water.pdf BIBCODE: 2018JGRC.123.3286C doi:10.1002/2017JC013521 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-03658685 Journal of Geophysical Research. Oceans, 2018, 123, pp.3286-3306. ⟨10.1002/2017JC013521⟩ eddy dynamics Indo-Atlantic exchange AAIW [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2018 ftccsdartic https://doi.org/10.1002/2017JC013521 2024-01-21T00:26:48Z International audience This study evaluates the capability of eddy-permitting regional ocean models to reproduce the interocean exchange south of Africa. In this highly turbulent region, we show that the vertical structure of the horizontal flows need to be appropriately resolved to realistically advect thermocline water masses into the South Atlantic. Our results point out that a grid-spacing of 1/24° on the horizontal and 50 m on the vertical homogeneously distributed are required to account for a correct transport of surface and subsurface water masses properties and their in-route transformation by mixing. Preliminary Lagrangian analyses highlight the primary role of the upper-ocean mesoscale eddies on water masses transport and fate, with a particular emphasis on Antarctic Intermediate Waters (AAIWs) dynamics and characteristics. We evaluate the numerical results against observations (AVISO data and Argo floats profiles). Modeled and observed eddies were examined in number, polarity, size, trajectory, and for their contribution to AAIW properties. A clear asymmetry, in number and radius, emerges between cyclones and anticyclones. The high-resolution simulation was the most energetic, with more abundant and smaller structures than those detected in AVISO. However, eddy statistics compare reasonably well in terms of mean pathways when restricted to Agulhas Rings, which are on average quasi-Gaussian in shape. Regionally, the Ertel potential vorticity anomaly is marked at the surface by a temporal variability with winter intensification, directly reflected in the seasonal cycle of the eddies number. Noting the growth of the baroclinic Rossby radius in winter, this suggests baroclinic processes as essential for these eddies generation. Article in Journal/Newspaper Antarc* Antarctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Journal of Geophysical Research: Oceans 123 5 3286 3306 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
eddy dynamics Indo-Atlantic exchange AAIW [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
eddy dynamics Indo-Atlantic exchange AAIW [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Capuano, Tonia Astrid Speich, Sabrina Carton, Xavier Laxenaire, Remi Indo-Atlantic Exchange, Mesoscale Dynamics, and Antarctic Intermediate Water |
topic_facet |
eddy dynamics Indo-Atlantic exchange AAIW [SDU]Sciences of the Universe [physics] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience This study evaluates the capability of eddy-permitting regional ocean models to reproduce the interocean exchange south of Africa. In this highly turbulent region, we show that the vertical structure of the horizontal flows need to be appropriately resolved to realistically advect thermocline water masses into the South Atlantic. Our results point out that a grid-spacing of 1/24° on the horizontal and 50 m on the vertical homogeneously distributed are required to account for a correct transport of surface and subsurface water masses properties and their in-route transformation by mixing. Preliminary Lagrangian analyses highlight the primary role of the upper-ocean mesoscale eddies on water masses transport and fate, with a particular emphasis on Antarctic Intermediate Waters (AAIWs) dynamics and characteristics. We evaluate the numerical results against observations (AVISO data and Argo floats profiles). Modeled and observed eddies were examined in number, polarity, size, trajectory, and for their contribution to AAIW properties. A clear asymmetry, in number and radius, emerges between cyclones and anticyclones. The high-resolution simulation was the most energetic, with more abundant and smaller structures than those detected in AVISO. However, eddy statistics compare reasonably well in terms of mean pathways when restricted to Agulhas Rings, which are on average quasi-Gaussian in shape. Regionally, the Ertel potential vorticity anomaly is marked at the surface by a temporal variability with winter intensification, directly reflected in the seasonal cycle of the eddies number. Noting the growth of the baroclinic Rossby radius in winter, this suggests baroclinic processes as essential for these eddies generation. |
author2 |
Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) |
format |
Article in Journal/Newspaper |
author |
Capuano, Tonia Astrid Speich, Sabrina Carton, Xavier Laxenaire, Remi |
author_facet |
Capuano, Tonia Astrid Speich, Sabrina Carton, Xavier Laxenaire, Remi |
author_sort |
Capuano, Tonia Astrid |
title |
Indo-Atlantic Exchange, Mesoscale Dynamics, and Antarctic Intermediate Water |
title_short |
Indo-Atlantic Exchange, Mesoscale Dynamics, and Antarctic Intermediate Water |
title_full |
Indo-Atlantic Exchange, Mesoscale Dynamics, and Antarctic Intermediate Water |
title_fullStr |
Indo-Atlantic Exchange, Mesoscale Dynamics, and Antarctic Intermediate Water |
title_full_unstemmed |
Indo-Atlantic Exchange, Mesoscale Dynamics, and Antarctic Intermediate Water |
title_sort |
indo-atlantic exchange, mesoscale dynamics, and antarctic intermediate water |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-03658685 https://hal.science/hal-03658685/document https://hal.science/hal-03658685/file/JGR%20Oceans%20-%202018%20-%20Capuano%20-%20Indo%25u2010Atlantic%20Exchange%20Mesoscale%20Dynamics%20and%20Antarctic%20Intermediate%20Water.pdf https://doi.org/10.1002/2017JC013521 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-03658685 Journal of Geophysical Research. Oceans, 2018, 123, pp.3286-3306. ⟨10.1002/2017JC013521⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2017JC013521 hal-03658685 https://hal.science/hal-03658685 https://hal.science/hal-03658685/document https://hal.science/hal-03658685/file/JGR%20Oceans%20-%202018%20-%20Capuano%20-%20Indo%25u2010Atlantic%20Exchange%20Mesoscale%20Dynamics%20and%20Antarctic%20Intermediate%20Water.pdf BIBCODE: 2018JGRC.123.3286C doi:10.1002/2017JC013521 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2017JC013521 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
5 |
container_start_page |
3286 |
op_container_end_page |
3306 |
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1790593322375446528 |