On the representation of the ACC circulation around the Kerguelen Plateau in an OGCM
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 (ACC) in the Indian sector of the Southern Ocean. While most of the ACC transport is deflected north of the...
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HAL CCSD
2009
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Online Access: | https://hal.science/hal-04113680 |
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openpolar |
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Open Polar |
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Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
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ftuniversailles |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
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[SDU]Sciences of the Universe [physics] Roquet, Fabien Park, Young-Hyang Madec, Gurvan On the representation of the ACC circulation around the Kerguelen Plateau in an OGCM |
topic_facet |
[SDU]Sciences of the Universe [physics] |
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 (ACC) in the Indian sector of the Southern Ocean. While most of the ACC transport is deflected north of the Kerguelen Islands, the remainder (~50 x 106 m3 s-1) must pass south of the islands, most probably through the Fawn Trough (56°S, 77°E, 2650m) and Princess Elizabeth Trough (64°S, 82°E, 3650 m). Yet, lack of observations in this area still hampers our knowledge on the exact partitioning and its temporal variability of the circumpolar flow through the abovementioned three passages. We have developed a regional configuration of the Southern Indian Ocean using the eddy-permitting (1/4°) global ocean/sea-ice model NEMO. A 20-year long simulation has been performed, using the open boundary conditions derived from the KAB001 interannual experiment. The KAB001 experiment is characterized by a slight 3D TS restoring in polar areas, which allows the continuous maintaining of adequate bottom properties around Antarctica, and thus yielding a realistic and stable ACC transport (~150 x 106 m3 s-1 at Drake Passage). The main ACC veins detected from satellite and in situ observations are consistently well represented in our regional model. In particular, the presence of a strong topographically controlled northeastward current through the Fawn Trough channelling most of the Enderby Basin water has been confirmed. The lagrangian diagnostic tool ARIANE has been used on the model velocity field to show the ACC circulation splitting into several branches. It also allows a precise diagnostic of the temporal variability of these branches as well as the transformation of water masses along their trajectories. We verified that the area just downstream of the Fawn Trough in the Australian-Antarctic Basin is an outstanding region of enhanced water mass transformation where waters of different origins collide and mix. |
author2 |
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)-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)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Roquet, Fabien Park, Young-Hyang Madec, Gurvan |
author_facet |
Roquet, Fabien Park, Young-Hyang Madec, Gurvan |
author_sort |
Roquet, Fabien |
title |
On the representation of the ACC circulation around the Kerguelen Plateau in an OGCM |
title_short |
On the representation of the ACC circulation around the Kerguelen Plateau in an OGCM |
title_full |
On the representation of the ACC circulation around the Kerguelen Plateau in an OGCM |
title_fullStr |
On the representation of the ACC circulation around the Kerguelen Plateau in an OGCM |
title_full_unstemmed |
On the representation of the ACC circulation around the Kerguelen Plateau in an OGCM |
title_sort |
on the representation of the acc circulation around the kerguelen plateau in an ogcm |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-04113680 |
op_coverage |
Vienna, Austria |
genre |
Antarc* Antarctic Antarctica Drake Passage Kerguelen Islands Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Kerguelen Islands Sea ice Southern Ocean |
op_source |
EGU General Assembly 2009 https://hal.science/hal-04113680 EGU General Assembly 2009, Apr 2009, Vienna, Austria. pp.8723 |
op_relation |
hal-04113680 https://hal.science/hal-04113680 BIBCODE: 2009EGUGA.11.8723R |
_version_ |
1799470362710245376 |
spelling |
ftuniversailles:oai:HAL:hal-04113680v1 2024-05-19T07:32:21+00:00 On the representation of the ACC circulation around the Kerguelen Plateau in an OGCM Roquet, Fabien Park, Young-Hyang Madec, Gurvan 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)-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)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Vienna, Austria 2009-04-19 https://hal.science/hal-04113680 en eng HAL CCSD hal-04113680 https://hal.science/hal-04113680 BIBCODE: 2009EGUGA.11.8723R EGU General Assembly 2009 https://hal.science/hal-04113680 EGU General Assembly 2009, Apr 2009, Vienna, Austria. pp.8723 [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/conferenceObject Conference papers 2009 ftuniversailles 2024-04-25T00:19:42Z 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 (ACC) in the Indian sector of the Southern Ocean. While most of the ACC transport is deflected north of the Kerguelen Islands, the remainder (~50 x 106 m3 s-1) must pass south of the islands, most probably through the Fawn Trough (56°S, 77°E, 2650m) and Princess Elizabeth Trough (64°S, 82°E, 3650 m). Yet, lack of observations in this area still hampers our knowledge on the exact partitioning and its temporal variability of the circumpolar flow through the abovementioned three passages. We have developed a regional configuration of the Southern Indian Ocean using the eddy-permitting (1/4°) global ocean/sea-ice model NEMO. A 20-year long simulation has been performed, using the open boundary conditions derived from the KAB001 interannual experiment. The KAB001 experiment is characterized by a slight 3D TS restoring in polar areas, which allows the continuous maintaining of adequate bottom properties around Antarctica, and thus yielding a realistic and stable ACC transport (~150 x 106 m3 s-1 at Drake Passage). The main ACC veins detected from satellite and in situ observations are consistently well represented in our regional model. In particular, the presence of a strong topographically controlled northeastward current through the Fawn Trough channelling most of the Enderby Basin water has been confirmed. The lagrangian diagnostic tool ARIANE has been used on the model velocity field to show the ACC circulation splitting into several branches. It also allows a precise diagnostic of the temporal variability of these branches as well as the transformation of water masses along their trajectories. We verified that the area just downstream of the Fawn Trough in the Australian-Antarctic Basin is an outstanding region of enhanced water mass transformation where waters of different origins collide and mix. Conference Object Antarc* Antarctic Antarctica Drake Passage Kerguelen Islands Sea ice Southern Ocean Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |