Variability of the Subantarctic and Polar fronts in the Drake Passage as deduced from altimetry
The magnitude and time variability of the total volume transport of the Antarctic Circumpolar Current through Drake Passage is a key climatic index, yet still uncertain. We processed ten years of TOPEX/Poseïdon data along two adjacent descending tracks in Drake Passage assuming (following Gille, 199...
Published in: | Journal of Marine Research |
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Main Authors: | , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2006
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Online Access: | https://hal.archives-ouvertes.fr/hal-00160368 https://doi.org/10.1357/002224006779367276 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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English |
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[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Chouaib, Nadine Stoehr, Felix Provost, Christine Variability of the Subantarctic and Polar fronts in the Drake Passage as deduced from altimetry |
topic_facet |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
The magnitude and time variability of the total volume transport of the Antarctic Circumpolar Current through Drake Passage is a key climatic index, yet still uncertain. We processed ten years of TOPEX/Poseïdon data along two adjacent descending tracks in Drake Passage assuming (following Gille, 1994) that the surface current velocity has a profile structure of double Gaussian jets corresponding respectively to the Subantarctic Front (SAF) and the Polar Front (PF). We seek the location, width and intensity of each jet as a function of time. Results from the two tracks are coherent and show that the time evolution of the flows is well constrained, although the absolute magnitude of the flow is not. Robust conclusions can be drawn using correlations between parameters and spectral analysis of their time evolution. The two front locations are positively correlated (0.68). When the SAF is farther south, it is also wider and has a larger surface transport. When the PF is farther south, it narrows with a smaller surface transport. The two widths are significantly negatively correlated (-0.58) and the maximum velocities are independent (0.08). The surface transports associated with the SAF and PF are strongly anti-correlated (-0.98) so that the variance of total surface transport is much smaller than the variance of the surface transport of each individual front. Spectral peaks for SAF and PF surface transports are, in order of decreasing amplitude, less than 4 months, semi-annual, 2.6 years and annual. The total surface transport variations are distributed into two broad bands (less than 4 months-the most energetic-and from 0.5 to 3 years). |
author2 |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) 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 Paris) 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) |
format |
Article in Journal/Newspaper |
author |
Chouaib, Nadine Stoehr, Felix Provost, Christine |
author_facet |
Chouaib, Nadine Stoehr, Felix Provost, Christine |
author_sort |
Chouaib, Nadine |
title |
Variability of the Subantarctic and Polar fronts in the Drake Passage as deduced from altimetry |
title_short |
Variability of the Subantarctic and Polar fronts in the Drake Passage as deduced from altimetry |
title_full |
Variability of the Subantarctic and Polar fronts in the Drake Passage as deduced from altimetry |
title_fullStr |
Variability of the Subantarctic and Polar fronts in the Drake Passage as deduced from altimetry |
title_full_unstemmed |
Variability of the Subantarctic and Polar fronts in the Drake Passage as deduced from altimetry |
title_sort |
variability of the subantarctic and polar fronts in the drake passage as deduced from altimetry |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.archives-ouvertes.fr/hal-00160368 https://doi.org/10.1357/002224006779367276 |
geographic |
Antarctic The Antarctic Drake Passage |
geographic_facet |
Antarctic The Antarctic Drake Passage |
genre |
Antarc* Antarctic Drake Passage |
genre_facet |
Antarc* Antarctic Drake Passage |
op_source |
ISSN: 0022-2402 EISSN: 1543-9542 Journal of marine research https://hal.archives-ouvertes.fr/hal-00160368 Journal of marine research, Yale University, 2006, 64 (5), pp.669-693. ⟨10.1357/002224006779367276⟩ |
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op_doi |
https://doi.org/10.1357/002224006779367276 |
container_title |
Journal of Marine Research |
container_volume |
64 |
container_issue |
5 |
container_start_page |
669 |
op_container_end_page |
693 |
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1766136564329480192 |
spelling |
ftccsdartic:oai:HAL:hal-00160368v1 2023-05-15T13:40:31+02:00 Variability of the Subantarctic and Polar fronts in the Drake Passage as deduced from altimetry Chouaib, Nadine Stoehr, Felix Provost, Christine Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) 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 Paris) 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) 2006 https://hal.archives-ouvertes.fr/hal-00160368 https://doi.org/10.1357/002224006779367276 en eng HAL CCSD Yale University info:eu-repo/semantics/altIdentifier/doi/10.1357/002224006779367276 hal-00160368 https://hal.archives-ouvertes.fr/hal-00160368 doi:10.1357/002224006779367276 IRD: PAR00005477 ISSN: 0022-2402 EISSN: 1543-9542 Journal of marine research https://hal.archives-ouvertes.fr/hal-00160368 Journal of marine research, Yale University, 2006, 64 (5), pp.669-693. ⟨10.1357/002224006779367276⟩ [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2006 ftccsdartic https://doi.org/10.1357/002224006779367276 2021-11-21T05:31:00Z The magnitude and time variability of the total volume transport of the Antarctic Circumpolar Current through Drake Passage is a key climatic index, yet still uncertain. We processed ten years of TOPEX/Poseïdon data along two adjacent descending tracks in Drake Passage assuming (following Gille, 1994) that the surface current velocity has a profile structure of double Gaussian jets corresponding respectively to the Subantarctic Front (SAF) and the Polar Front (PF). We seek the location, width and intensity of each jet as a function of time. Results from the two tracks are coherent and show that the time evolution of the flows is well constrained, although the absolute magnitude of the flow is not. Robust conclusions can be drawn using correlations between parameters and spectral analysis of their time evolution. The two front locations are positively correlated (0.68). When the SAF is farther south, it is also wider and has a larger surface transport. When the PF is farther south, it narrows with a smaller surface transport. The two widths are significantly negatively correlated (-0.58) and the maximum velocities are independent (0.08). The surface transports associated with the SAF and PF are strongly anti-correlated (-0.98) so that the variance of total surface transport is much smaller than the variance of the surface transport of each individual front. Spectral peaks for SAF and PF surface transports are, in order of decreasing amplitude, less than 4 months, semi-annual, 2.6 years and annual. The total surface transport variations are distributed into two broad bands (less than 4 months-the most energetic-and from 0.5 to 3 years). Article in Journal/Newspaper Antarc* Antarctic Drake Passage Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Antarctic Drake Passage Journal of Marine Research 64 5 669 693 |