Heat fluxes across the Antarctic Circumpolar Current in Drake Passage: Mean flow and eddy contributions
International audience In contrast to a long-standing belief, observations in the Antarctic Circumpolar Current (ACC) show that mean velocity vectors rotate with depth, thus suggesting a possible importance of the time-mean flow for the local poleward heat transport. The respective contributions of...
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
2014
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Subjects: | |
Online Access: | https://hal.science/hal-01234145 https://hal.science/hal-01234145/document https://hal.science/hal-01234145/file/2014JC010201.pdf https://doi.org/10.1002/2014JC010201 |
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Open Polar |
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HAL Sorbonne Université |
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ftsorbonneuniv |
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] Ferrari, Ramiro Provost, Christine Park, Young-Hyang Sennéchael, Nathalie Koenig, Zoé Sekma, Hela Garric, Gilles Bourdallé-Badie, Romain Heat fluxes across the Antarctic Circumpolar Current in Drake Passage: Mean flow and eddy contributions |
topic_facet |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU]Sciences of the Universe [physics] |
description |
International audience In contrast to a long-standing belief, observations in the Antarctic Circumpolar Current (ACC) show that mean velocity vectors rotate with depth, thus suggesting a possible importance of the time-mean flow for the local poleward heat transport. The respective contributions of the eddy and mean flows to the heat flux across the ACC in Drake Passage (DP) are investigated using recently acquired and historical time series of velocity and temperature from a total of 24 current meter moorings and outputs of a high-resolution (1/12°) model with realistic topography. Only 11 out of the 24 depth-integrated eddy heat flux estimates are found to be significant, and they are poleward. Model depth-integrated eddy heat fluxes have similar signs and amplitudes as the in situ estimates at the mooring sites. They are mostly poleward or nonsignificant, with amplitude decreasing to the south. The cross-stream temperature fluxes caused by the mean flow at the moorings have a sign that varies with location and corresponds to the opposite of the vertical velocity estimates. The depth-integrated temperature fluxes due to the mean flow in the model exhibit small spatial scales and are of opposite sign to the bottom vertical velocities. This suggests that the rotation of the mean velocity vectors with depth is mainly due to bottom topography. The rough hilly topography in DP likely promotes the small-scale vertical velocities and temperature fluxes. Eddy heat fluxes and cross-stream temperature fluxes are integrated over mass-balanced regions defined by the model transport streamlines. The contribution of the mean flow to the ocean heat fluxes across the Southern ACC Front in DP (covering about 4% of the circumpolar longitudes) is about four times as large as the eddy heat flux contribution and the sum of the two represent on the order of 10% of the heat loss to the atmosphere south of 60°S. |
author2 |
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)-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) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-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) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-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)) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 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 CNES (Centre National d'Etudes Spatiales) through the OSTST program CNRS–INSU (Institut des Sciences de l'Univers) through the LEFE program European Project: 283367,EC:FP7:SPA,FP7-SPACE-2011-1,MYOCEAN2(2012) |
format |
Article in Journal/Newspaper |
author |
Ferrari, Ramiro Provost, Christine Park, Young-Hyang Sennéchael, Nathalie Koenig, Zoé Sekma, Hela Garric, Gilles Bourdallé-Badie, Romain |
author_facet |
Ferrari, Ramiro Provost, Christine Park, Young-Hyang Sennéchael, Nathalie Koenig, Zoé Sekma, Hela Garric, Gilles Bourdallé-Badie, Romain |
author_sort |
Ferrari, Ramiro |
title |
Heat fluxes across the Antarctic Circumpolar Current in Drake Passage: Mean flow and eddy contributions |
title_short |
Heat fluxes across the Antarctic Circumpolar Current in Drake Passage: Mean flow and eddy contributions |
title_full |
Heat fluxes across the Antarctic Circumpolar Current in Drake Passage: Mean flow and eddy contributions |
title_fullStr |
Heat fluxes across the Antarctic Circumpolar Current in Drake Passage: Mean flow and eddy contributions |
title_full_unstemmed |
Heat fluxes across the Antarctic Circumpolar Current in Drake Passage: Mean flow and eddy contributions |
title_sort |
heat fluxes across the antarctic circumpolar current in drake passage: mean flow and eddy contributions |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-01234145 https://hal.science/hal-01234145/document https://hal.science/hal-01234145/file/2014JC010201.pdf https://doi.org/10.1002/2014JC010201 |
geographic |
Antarctic Drake Passage The Antarctic |
geographic_facet |
Antarctic Drake Passage The Antarctic |
genre |
Antarc* Antarctic Drake Passage |
genre_facet |
Antarc* Antarctic Drake Passage |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-01234145 Journal of Geophysical Research. Oceans, 2014, 119 (9), pp.6381-6402. ⟨10.1002/2014JC010201⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2014JC010201 info:eu-repo/grantAgreement/EC/FP7/283367/EU/Prototype Operational Continuity for the GMES Ocean Monitoring and Forecasting Service/MYOCEAN2 hal-01234145 https://hal.science/hal-01234145 https://hal.science/hal-01234145/document https://hal.science/hal-01234145/file/2014JC010201.pdf doi:10.1002/2014JC010201 WOS: 000343879200045 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2014JC010201 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
119 |
container_issue |
9 |
container_start_page |
6381 |
op_container_end_page |
6402 |
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1812819408007987200 |
spelling |
ftsorbonneuniv:oai:HAL:hal-01234145v1 2024-10-13T14:02:58+00:00 Heat fluxes across the Antarctic Circumpolar Current in Drake Passage: Mean flow and eddy contributions Ferrari, Ramiro Provost, Christine Park, Young-Hyang Sennéchael, Nathalie Koenig, Zoé Sekma, Hela Garric, Gilles Bourdallé-Badie, Romain 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)-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) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-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) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-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)) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 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 CNES (Centre National d'Etudes Spatiales) through the OSTST program CNRS–INSU (Institut des Sciences de l'Univers) through the LEFE program European Project: 283367,EC:FP7:SPA,FP7-SPACE-2011-1,MYOCEAN2(2012) 2014-09 https://hal.science/hal-01234145 https://hal.science/hal-01234145/document https://hal.science/hal-01234145/file/2014JC010201.pdf https://doi.org/10.1002/2014JC010201 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1002/2014JC010201 info:eu-repo/grantAgreement/EC/FP7/283367/EU/Prototype Operational Continuity for the GMES Ocean Monitoring and Forecasting Service/MYOCEAN2 hal-01234145 https://hal.science/hal-01234145 https://hal.science/hal-01234145/document https://hal.science/hal-01234145/file/2014JC010201.pdf doi:10.1002/2014JC010201 WOS: 000343879200045 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-01234145 Journal of Geophysical Research. Oceans, 2014, 119 (9), pp.6381-6402. ⟨10.1002/2014JC010201⟩ [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 2014 ftsorbonneuniv https://doi.org/10.1002/2014JC010201 2024-09-16T14:23:58Z International audience In contrast to a long-standing belief, observations in the Antarctic Circumpolar Current (ACC) show that mean velocity vectors rotate with depth, thus suggesting a possible importance of the time-mean flow for the local poleward heat transport. The respective contributions of the eddy and mean flows to the heat flux across the ACC in Drake Passage (DP) are investigated using recently acquired and historical time series of velocity and temperature from a total of 24 current meter moorings and outputs of a high-resolution (1/12°) model with realistic topography. Only 11 out of the 24 depth-integrated eddy heat flux estimates are found to be significant, and they are poleward. Model depth-integrated eddy heat fluxes have similar signs and amplitudes as the in situ estimates at the mooring sites. They are mostly poleward or nonsignificant, with amplitude decreasing to the south. The cross-stream temperature fluxes caused by the mean flow at the moorings have a sign that varies with location and corresponds to the opposite of the vertical velocity estimates. The depth-integrated temperature fluxes due to the mean flow in the model exhibit small spatial scales and are of opposite sign to the bottom vertical velocities. This suggests that the rotation of the mean velocity vectors with depth is mainly due to bottom topography. The rough hilly topography in DP likely promotes the small-scale vertical velocities and temperature fluxes. Eddy heat fluxes and cross-stream temperature fluxes are integrated over mass-balanced regions defined by the model transport streamlines. The contribution of the mean flow to the ocean heat fluxes across the Southern ACC Front in DP (covering about 4% of the circumpolar longitudes) is about four times as large as the eddy heat flux contribution and the sum of the two represent on the order of 10% of the heat loss to the atmosphere south of 60°S. Article in Journal/Newspaper Antarc* Antarctic Drake Passage HAL Sorbonne Université Antarctic Drake Passage The Antarctic Journal of Geophysical Research: Oceans 119 9 6381 6402 |