Observations of the Fawn Trough Current over the Kerguelen Plateau from instrumented elephant seals
International audience Due to its great meridional extent and relatively shallow depths, the Kerguelen Plateau constitutes a major barrier to the eastward flowing Antarctic Circumpolar Current in the Indian sector of the Southern Ocean. While most of the Antarctic Circumpolar Current transport is de...
Published in: | Journal of Marine Systems |
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Main Authors: | , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2009
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Subjects: | |
Online Access: | https://doi.org/10.1016/j.jmarsys.2008.11.017 https://hal.archives-ouvertes.fr/hal-00410201 |
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fttriple:oai:gotriple.eu:10670/1.kqlyb0 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Ocean circulation Kerguelen Plateau [46–62°S Oceanic fronts Southern Ocean Elephant seals Bio-logging Fawn Trough Current 65–85°E ] geo envir |
spellingShingle |
Ocean circulation Kerguelen Plateau [46–62°S Oceanic fronts Southern Ocean Elephant seals Bio-logging Fawn Trough Current 65–85°E ] geo envir Roquet, Fabien Park, Young-Hyang Guinet, Christophe Bailleul, Frédéric Charrassin, Jean-Benoît Observations of the Fawn Trough Current over the Kerguelen Plateau from instrumented elephant seals |
topic_facet |
Ocean circulation Kerguelen Plateau [46–62°S Oceanic fronts Southern Ocean Elephant seals Bio-logging Fawn Trough Current 65–85°E ] geo envir |
description |
International audience Due to its great meridional extent and relatively shallow depths, the Kerguelen Plateau constitutes a major barrier to the eastward flowing Antarctic Circumpolar Current in the Indian sector of the Southern Ocean. While most of the Antarctic Circumpolar Current transport is deflected north of the Kerguelen Islands, the remainder (∼50 Sv, 1 Sv=106 m3 s−1) must pass south of the islands, most probably through the Fawn and Princess Elizabeth Troughs. However, the paucity of finely resolved quasi-synoptic hydrographic data in this remote and infrequently sampled area has limited the progress in our knowledge of the regional circulation. Since 2004, a new approach using elephant seals from the Kerguelen Islands as autonomous oceanographic profilers has provided new information on the hydrography over the Kerguelen Plateau, covering the entire Antarctic Zone between the Polar Front and Antarctica, with a mean along-track resolution of about 25 km. These finely resolved bio-logged data revealed details of a strong northeastward current found across the Fawn Trough (sill depth: 2600 m; 56°S, 78°E). This so-called Fawn Trough Current transports cold Antarctic waters found mostly south of the Elan Bank, between the Ice Limit (58°S) and the Antarctic Divergence (64°S) in the eastern Enderby Basin, toward the Australian–Antarctic Basin. Our analysis also demonstrates that the Deep Western Boundary Current, which carries cold Antarctic water along the eastern flank of the southern Kerguelen Plateau collides with Fawn Trough Current at the outlet of the Fawn Trough sill. In other words, the Fawn Trough constitutes a veritable bottleneck, channelling the quasi-totality of the Antarctic Circumpolar flow found south of the Polar Front. Thanks to the unprecedented fine resolution of seal-borne data, a branch of flow centered at the Winter Water isotherm of 1 °C is also revealed along the northern escarpment of the Elan Bank, and then along the southern edge of Heard Island. Further analysis of different ... |
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) Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Roquet, Fabien Park, Young-Hyang Guinet, Christophe Bailleul, Frédéric Charrassin, Jean-Benoît |
author_facet |
Roquet, Fabien Park, Young-Hyang Guinet, Christophe Bailleul, Frédéric Charrassin, Jean-Benoît |
author_sort |
Roquet, Fabien |
title |
Observations of the Fawn Trough Current over the Kerguelen Plateau from instrumented elephant seals |
title_short |
Observations of the Fawn Trough Current over the Kerguelen Plateau from instrumented elephant seals |
title_full |
Observations of the Fawn Trough Current over the Kerguelen Plateau from instrumented elephant seals |
title_fullStr |
Observations of the Fawn Trough Current over the Kerguelen Plateau from instrumented elephant seals |
title_full_unstemmed |
Observations of the Fawn Trough Current over the Kerguelen Plateau from instrumented elephant seals |
title_sort |
observations of the fawn trough current over the kerguelen plateau from instrumented elephant seals |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://doi.org/10.1016/j.jmarsys.2008.11.017 https://hal.archives-ouvertes.fr/hal-00410201 |
long_lat |
ENVELOPE(120.000,120.000,-60.000,-60.000) ENVELOPE(134.115,134.115,-58.800,-58.800) ENVELOPE(67.000,67.000,-56.750,-56.750) ENVELOPE(75.500,75.500,-57.750,-57.750) |
geographic |
Antarctic Australian Antarctic Basin Australian-Antarctic Basin Elan Bank Fawn Trough Heard Island Indian Kerguelen Kerguelen Islands Southern Ocean The Antarctic |
geographic_facet |
Antarctic Australian Antarctic Basin Australian-Antarctic Basin Elan Bank Fawn Trough Heard Island Indian Kerguelen Kerguelen Islands Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Elephant Seals Heard Island Kerguelen Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Elephant Seals Heard Island Kerguelen Islands Southern Ocean |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0924-7963 Journal of Marine Systems Journal of Marine Systems, Elsevier, 2009, 78, pp.377-393. ⟨10.1016/j.jmarsys.2008.11.017⟩ |
op_relation |
hal-00410201 doi:10.1016/j.jmarsys.2008.11.017 10670/1.kqlyb0 https://hal.archives-ouvertes.fr/hal-00410201 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1016/j.jmarsys.2008.11.017 |
container_title |
Journal of Marine Systems |
container_volume |
78 |
container_issue |
3 |
container_start_page |
377 |
op_container_end_page |
393 |
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1766049562479296512 |
spelling |
fttriple:oai:gotriple.eu:10670/1.kqlyb0 2023-05-15T13:34:10+02:00 Observations of the Fawn Trough Current over the Kerguelen Plateau from instrumented elephant seals Roquet, Fabien Park, Young-Hyang Guinet, Christophe Bailleul, Frédéric Charrassin, Jean-Benoît 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) Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) 2009-05-18 https://doi.org/10.1016/j.jmarsys.2008.11.017 https://hal.archives-ouvertes.fr/hal-00410201 en eng HAL CCSD Elsevier hal-00410201 doi:10.1016/j.jmarsys.2008.11.017 10670/1.kqlyb0 https://hal.archives-ouvertes.fr/hal-00410201 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0924-7963 Journal of Marine Systems Journal of Marine Systems, Elsevier, 2009, 78, pp.377-393. ⟨10.1016/j.jmarsys.2008.11.017⟩ Ocean circulation Kerguelen Plateau [46–62°S Oceanic fronts Southern Ocean Elephant seals Bio-logging Fawn Trough Current 65–85°E ] geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2009 fttriple https://doi.org/10.1016/j.jmarsys.2008.11.017 2023-01-22T16:58:30Z International audience Due to its great meridional extent and relatively shallow depths, the Kerguelen Plateau constitutes a major barrier to the eastward flowing Antarctic Circumpolar Current in the Indian sector of the Southern Ocean. While most of the Antarctic Circumpolar Current transport is deflected north of the Kerguelen Islands, the remainder (∼50 Sv, 1 Sv=106 m3 s−1) must pass south of the islands, most probably through the Fawn and Princess Elizabeth Troughs. However, the paucity of finely resolved quasi-synoptic hydrographic data in this remote and infrequently sampled area has limited the progress in our knowledge of the regional circulation. Since 2004, a new approach using elephant seals from the Kerguelen Islands as autonomous oceanographic profilers has provided new information on the hydrography over the Kerguelen Plateau, covering the entire Antarctic Zone between the Polar Front and Antarctica, with a mean along-track resolution of about 25 km. These finely resolved bio-logged data revealed details of a strong northeastward current found across the Fawn Trough (sill depth: 2600 m; 56°S, 78°E). This so-called Fawn Trough Current transports cold Antarctic waters found mostly south of the Elan Bank, between the Ice Limit (58°S) and the Antarctic Divergence (64°S) in the eastern Enderby Basin, toward the Australian–Antarctic Basin. Our analysis also demonstrates that the Deep Western Boundary Current, which carries cold Antarctic water along the eastern flank of the southern Kerguelen Plateau collides with Fawn Trough Current at the outlet of the Fawn Trough sill. In other words, the Fawn Trough constitutes a veritable bottleneck, channelling the quasi-totality of the Antarctic Circumpolar flow found south of the Polar Front. Thanks to the unprecedented fine resolution of seal-borne data, a branch of flow centered at the Winter Water isotherm of 1 °C is also revealed along the northern escarpment of the Elan Bank, and then along the southern edge of Heard Island. Further analysis of different ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Elephant Seals Heard Island Kerguelen Islands Southern Ocean Unknown Antarctic Australian Antarctic Basin ENVELOPE(120.000,120.000,-60.000,-60.000) Australian-Antarctic Basin ENVELOPE(134.115,134.115,-58.800,-58.800) Elan Bank ENVELOPE(67.000,67.000,-56.750,-56.750) Fawn Trough ENVELOPE(75.500,75.500,-57.750,-57.750) Heard Island Indian Kerguelen Kerguelen Islands Southern Ocean The Antarctic Journal of Marine Systems 78 3 377 393 |