Revisiting the Malvinas Current upper circulation and water masses using a highresolution ocean reanalysis
International audience We use 25 years of a high-resolution ocean reanalysis (1/12°) to revisit the Malvinas Current (MC) from the South (Drake Passage) to the North (Brazil-Malvinas Confluence) from the synoptic to interannual time scales. The Malvinas Plateau is home to active eddy mixing, eddy di...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.sorbonne-universite.fr/hal-03247496 https://hal.sorbonne-universite.fr/hal-03247496/document https://hal.sorbonne-universite.fr/hal-03247496/file/Artana%20et%20al.%20-%202021%20-%20Revisiting%20the%20Malvinas%20Current%20Upper%20Circulation%20.pdf https://doi.org/10.1029/2021JC017271 |
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ftmuseumnhn:oai:HAL:hal-03247496v1 |
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openpolar |
institution |
Open Polar |
collection |
Muséum National d'Histoire Naturelle (MNHM): HAL |
op_collection_id |
ftmuseumnhn |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Artana, Camila Provost, Christine Poli, Léa Ferrari, Ramiro Lellouche, Jean-Michel Revisiting the Malvinas Current upper circulation and water masses using a highresolution ocean reanalysis |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience We use 25 years of a high-resolution ocean reanalysis (1/12°) to revisit the Malvinas Current (MC) from the South (Drake Passage) to the North (Brazil-Malvinas Confluence) from the synoptic to interannual time scales. The Malvinas Plateau is home to active eddy mixing, eddy dissipation and deep winter mixed layers occasionally reaching 600 m depth. The MC is organized in two jets which merge around 44°S as the continental slope steepens. The upper 900 m transport mean decreases from 40 Sv at 51°S to 35 Sv at 41°S indicating offshore leakage along the MC path. The MC plays a minor role in the velocity variations observed at the Confluence at seasonal and interannual scales; those are driven by changes in the intensity of the Brazil Current over the slope (34–36°S). Computing MC transport time series at different latitudes requires care because the section eastern limits are embedded in an energetic region. Transport time series were produced at selected latitudes using different criteria and showed common features. They show little seasonality (relative seasonal standard deviation of 2%) and no significant trend. The MC is a steady current: the relative standard deviation is on the order of 10% increasing to 20% near and on the Malvinas Plateau and near the Confluence. In contrast, velocity trends are large in the Brazil Current with the overshoot migrating southward. The associated increase in mesoscale activity south of 44°S in the Argentine Basin might contribute to blocking events occasionally reducing the MC transport. |
author2 |
Mercator Océan Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Service hydrographique et océanographique de la Marine-Centre National de la Recherche Scientifique (CNRS)-Météo-France Austral, Boréal et Carbone (ABC) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Centro de Investigaciones del Mar y la Atmósfera (CIMA) Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET)-Facultad de Ciencias Exactas y Naturales Buenos Aires (FCEyN) Universidad de Buenos Aires Buenos Aires (UBA)-Universidad de Buenos Aires Buenos Aires (UBA) |
format |
Article in Journal/Newspaper |
author |
Artana, Camila Provost, Christine Poli, Léa Ferrari, Ramiro Lellouche, Jean-Michel |
author_facet |
Artana, Camila Provost, Christine Poli, Léa Ferrari, Ramiro Lellouche, Jean-Michel |
author_sort |
Artana, Camila |
title |
Revisiting the Malvinas Current upper circulation and water masses using a highresolution ocean reanalysis |
title_short |
Revisiting the Malvinas Current upper circulation and water masses using a highresolution ocean reanalysis |
title_full |
Revisiting the Malvinas Current upper circulation and water masses using a highresolution ocean reanalysis |
title_fullStr |
Revisiting the Malvinas Current upper circulation and water masses using a highresolution ocean reanalysis |
title_full_unstemmed |
Revisiting the Malvinas Current upper circulation and water masses using a highresolution ocean reanalysis |
title_sort |
revisiting the malvinas current upper circulation and water masses using a highresolution ocean reanalysis |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.sorbonne-universite.fr/hal-03247496 https://hal.sorbonne-universite.fr/hal-03247496/document https://hal.sorbonne-universite.fr/hal-03247496/file/Artana%20et%20al.%20-%202021%20-%20Revisiting%20the%20Malvinas%20Current%20Upper%20Circulation%20.pdf https://doi.org/10.1029/2021JC017271 |
genre |
Drake Passage |
genre_facet |
Drake Passage |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.sorbonne-universite.fr/hal-03247496 Journal of Geophysical Research. Oceans, 2021, 126 (6), ⟨10.1029/2021JC017271⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JC017271 hal-03247496 https://hal.sorbonne-universite.fr/hal-03247496 https://hal.sorbonne-universite.fr/hal-03247496/document https://hal.sorbonne-universite.fr/hal-03247496/file/Artana%20et%20al.%20-%202021%20-%20Revisiting%20the%20Malvinas%20Current%20Upper%20Circulation%20.pdf doi:10.1029/2021JC017271 WOS: 000665203500036 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2021JC017271 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
6 |
_version_ |
1799479096742248448 |
spelling |
ftmuseumnhn:oai:HAL:hal-03247496v1 2024-05-19T07:39:31+00:00 Revisiting the Malvinas Current upper circulation and water masses using a highresolution ocean reanalysis Artana, Camila Provost, Christine Poli, Léa Ferrari, Ramiro Lellouche, Jean-Michel Mercator Océan Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Service hydrographique et océanographique de la Marine-Centre National de la Recherche Scientifique (CNRS)-Météo-France Austral, Boréal et Carbone (ABC) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Centro de Investigaciones del Mar y la Atmósfera (CIMA) Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET)-Facultad de Ciencias Exactas y Naturales Buenos Aires (FCEyN) Universidad de Buenos Aires Buenos Aires (UBA)-Universidad de Buenos Aires Buenos Aires (UBA) 2021-06 https://hal.sorbonne-universite.fr/hal-03247496 https://hal.sorbonne-universite.fr/hal-03247496/document https://hal.sorbonne-universite.fr/hal-03247496/file/Artana%20et%20al.%20-%202021%20-%20Revisiting%20the%20Malvinas%20Current%20Upper%20Circulation%20.pdf https://doi.org/10.1029/2021JC017271 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JC017271 hal-03247496 https://hal.sorbonne-universite.fr/hal-03247496 https://hal.sorbonne-universite.fr/hal-03247496/document https://hal.sorbonne-universite.fr/hal-03247496/file/Artana%20et%20al.%20-%202021%20-%20Revisiting%20the%20Malvinas%20Current%20Upper%20Circulation%20.pdf doi:10.1029/2021JC017271 WOS: 000665203500036 info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.sorbonne-universite.fr/hal-03247496 Journal of Geophysical Research. Oceans, 2021, 126 (6), ⟨10.1029/2021JC017271⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftmuseumnhn https://doi.org/10.1029/2021JC017271 2024-04-25T00:47:02Z International audience We use 25 years of a high-resolution ocean reanalysis (1/12°) to revisit the Malvinas Current (MC) from the South (Drake Passage) to the North (Brazil-Malvinas Confluence) from the synoptic to interannual time scales. The Malvinas Plateau is home to active eddy mixing, eddy dissipation and deep winter mixed layers occasionally reaching 600 m depth. The MC is organized in two jets which merge around 44°S as the continental slope steepens. The upper 900 m transport mean decreases from 40 Sv at 51°S to 35 Sv at 41°S indicating offshore leakage along the MC path. The MC plays a minor role in the velocity variations observed at the Confluence at seasonal and interannual scales; those are driven by changes in the intensity of the Brazil Current over the slope (34–36°S). Computing MC transport time series at different latitudes requires care because the section eastern limits are embedded in an energetic region. Transport time series were produced at selected latitudes using different criteria and showed common features. They show little seasonality (relative seasonal standard deviation of 2%) and no significant trend. The MC is a steady current: the relative standard deviation is on the order of 10% increasing to 20% near and on the Malvinas Plateau and near the Confluence. In contrast, velocity trends are large in the Brazil Current with the overshoot migrating southward. The associated increase in mesoscale activity south of 44°S in the Argentine Basin might contribute to blocking events occasionally reducing the MC transport. Article in Journal/Newspaper Drake Passage Muséum National d'Histoire Naturelle (MNHM): HAL Journal of Geophysical Research: Oceans 126 6 |