Malvinas Current at 40°S–41°S: first assessment of temperature and salinity temporal variability
International audience The temporal variability of 11 months of in situ velocity, temperature, and salinity data collected at five moorings deployed at 40°S–41°S across the shelf-break in the Southwestern Atlantic is analyzed. Two distinct regimes characterized by strong and weak along-slope velocit...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2018
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Subjects: | |
Online Access: | https://hal.science/hal-02190616 https://hal.science/hal-02190616/document https://hal.science/hal-02190616/file/JGR%20Oceans%20-%202018%20-%20Paniagua%20-%20Malvinas%20Current%20at%2040%20S%2041%20S%20First%20Assessment%20of%20Temperature%20and%20Salinity%20Temporal.pdf https://doi.org/10.1029/2017JC013666 |
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ftuniparissaclay:oai:HAL:hal-02190616v1 |
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openpolar |
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Open Polar |
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Archives ouvertes de Paris-Saclay |
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ftuniparissaclay |
language |
English |
topic |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU]Sciences of the Universe [physics] |
spellingShingle |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU]Sciences of the Universe [physics] Paniagua, Guillermina Saraceno, Martin Piola, Alberto R. Guerrero, Raúl Provost, Christine Ferrari, Ramiro Lago, Loreley Artana, Camila Malvinas Current at 40°S–41°S: first assessment of temperature and salinity temporal variability |
topic_facet |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU]Sciences of the Universe [physics] |
description |
International audience The temporal variability of 11 months of in situ velocity, temperature, and salinity data collected at five moorings deployed at 40°S–41°S across the shelf-break in the Southwestern Atlantic is analyzed. Two distinct regimes characterized by strong and weak along-slope velocities are present. During the strong regime the Malvinas Current flows northward through the moorings while during the nearly 5months long weak regime reversals of the along-slope velocities are frequently observed. Comparison with the previous in situ time series obtained in the same region shows that such an extended period of weak flow has not been previously observed. During the weak regime, Sub-Antarctic Mode Water is observed over the 1,800 m isobath at an average depth of 500 m. Water masses occupying the upper 1,600 m during the strong regime deepen and shift eastward during the weak period. Satellite geostrophic velocities and sea surface temperature clearly show that the weak regime is due to a deflection to the east of the Malvinas Current, upstream of the mooring position. Analysis of the vertical structure of the currents indicate that during the weak regime the flow weakens mostly at the surface and presents a very small vertical shear. In contrast, during the strong regime currents are surface-intensified. The change in the structure of the cur-rents at the mooring location impacts the relationship between in situ and altimetry-derived currents: during the weak regime altimetry adequately represents (rmsd 12 cm/s) in situ currents in the whole water column, while during strong regime rmsd are larger than 15 cm/s below 600 m depth. |
author2 |
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) Departamento de Ciencias de la Atmosfera y los Oceanos (DCAO) Facultad de Ciencias Exactas y Naturales Buenos Aires (FCEyN) Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos Buenos Aires (IFAECI) Universidad de Buenos Aires Buenos Aires (UBA)-Universidad de Buenos Aires Buenos Aires (UBA)-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)-Centre National de la Recherche Scientifique (CNRS) Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) 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) |
format |
Article in Journal/Newspaper |
author |
Paniagua, Guillermina Saraceno, Martin Piola, Alberto R. Guerrero, Raúl Provost, Christine Ferrari, Ramiro Lago, Loreley Artana, Camila |
author_facet |
Paniagua, Guillermina Saraceno, Martin Piola, Alberto R. Guerrero, Raúl Provost, Christine Ferrari, Ramiro Lago, Loreley Artana, Camila |
author_sort |
Paniagua, Guillermina |
title |
Malvinas Current at 40°S–41°S: first assessment of temperature and salinity temporal variability |
title_short |
Malvinas Current at 40°S–41°S: first assessment of temperature and salinity temporal variability |
title_full |
Malvinas Current at 40°S–41°S: first assessment of temperature and salinity temporal variability |
title_fullStr |
Malvinas Current at 40°S–41°S: first assessment of temperature and salinity temporal variability |
title_full_unstemmed |
Malvinas Current at 40°S–41°S: first assessment of temperature and salinity temporal variability |
title_sort |
malvinas current at 40°s–41°s: first assessment of temperature and salinity temporal variability |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-02190616 https://hal.science/hal-02190616/document https://hal.science/hal-02190616/file/JGR%20Oceans%20-%202018%20-%20Paniagua%20-%20Malvinas%20Current%20at%2040%20S%2041%20S%20First%20Assessment%20of%20Temperature%20and%20Salinity%20Temporal.pdf https://doi.org/10.1029/2017JC013666 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-02190616 Journal of Geophysical Research. Oceans, 2018, 123 (8), pp.5323-5340. ⟨10.1029/2017JC013666⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2017JC013666 hal-02190616 https://hal.science/hal-02190616 https://hal.science/hal-02190616/document https://hal.science/hal-02190616/file/JGR%20Oceans%20-%202018%20-%20Paniagua%20-%20Malvinas%20Current%20at%2040%20S%2041%20S%20First%20Assessment%20of%20Temperature%20and%20Salinity%20Temporal.pdf doi:10.1029/2017JC013666 WOS: 000445188900016 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2017JC013666 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
8 |
container_start_page |
5323 |
op_container_end_page |
5340 |
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1799470621233512448 |
spelling |
ftuniparissaclay:oai:HAL:hal-02190616v1 2024-05-19T07:32:32+00:00 Malvinas Current at 40°S–41°S: first assessment of temperature and salinity temporal variability Paniagua, Guillermina Saraceno, Martin Piola, Alberto R. Guerrero, Raúl Provost, Christine Ferrari, Ramiro Lago, Loreley Artana, Camila 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) Departamento de Ciencias de la Atmosfera y los Oceanos (DCAO) Facultad de Ciencias Exactas y Naturales Buenos Aires (FCEyN) Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos Buenos Aires (IFAECI) Universidad de Buenos Aires Buenos Aires (UBA)-Universidad de Buenos Aires Buenos Aires (UBA)-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)-Centre National de la Recherche Scientifique (CNRS) Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) 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) 2018-08-27 https://hal.science/hal-02190616 https://hal.science/hal-02190616/document https://hal.science/hal-02190616/file/JGR%20Oceans%20-%202018%20-%20Paniagua%20-%20Malvinas%20Current%20at%2040%20S%2041%20S%20First%20Assessment%20of%20Temperature%20and%20Salinity%20Temporal.pdf https://doi.org/10.1029/2017JC013666 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2017JC013666 hal-02190616 https://hal.science/hal-02190616 https://hal.science/hal-02190616/document https://hal.science/hal-02190616/file/JGR%20Oceans%20-%202018%20-%20Paniagua%20-%20Malvinas%20Current%20at%2040%20S%2041%20S%20First%20Assessment%20of%20Temperature%20and%20Salinity%20Temporal.pdf doi:10.1029/2017JC013666 WOS: 000445188900016 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-02190616 Journal of Geophysical Research. Oceans, 2018, 123 (8), pp.5323-5340. ⟨10.1029/2017JC013666⟩ [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2018 ftuniparissaclay https://doi.org/10.1029/2017JC013666 2024-04-22T17:32:52Z International audience The temporal variability of 11 months of in situ velocity, temperature, and salinity data collected at five moorings deployed at 40°S–41°S across the shelf-break in the Southwestern Atlantic is analyzed. Two distinct regimes characterized by strong and weak along-slope velocities are present. During the strong regime the Malvinas Current flows northward through the moorings while during the nearly 5months long weak regime reversals of the along-slope velocities are frequently observed. Comparison with the previous in situ time series obtained in the same region shows that such an extended period of weak flow has not been previously observed. During the weak regime, Sub-Antarctic Mode Water is observed over the 1,800 m isobath at an average depth of 500 m. Water masses occupying the upper 1,600 m during the strong regime deepen and shift eastward during the weak period. Satellite geostrophic velocities and sea surface temperature clearly show that the weak regime is due to a deflection to the east of the Malvinas Current, upstream of the mooring position. Analysis of the vertical structure of the currents indicate that during the weak regime the flow weakens mostly at the surface and presents a very small vertical shear. In contrast, during the strong regime currents are surface-intensified. The change in the structure of the cur-rents at the mooring location impacts the relationship between in situ and altimetry-derived currents: during the weak regime altimetry adequately represents (rmsd 12 cm/s) in situ currents in the whole water column, while during strong regime rmsd are larger than 15 cm/s below 600 m depth. Article in Journal/Newspaper Antarc* Antarctic Archives ouvertes de Paris-Saclay Journal of Geophysical Research: Oceans 123 8 5323 5340 |