Observations of the Antarctic Circumpolar Current Over the Udintsev Fracture Zone, the Narrowest Choke Point in the Southern Ocean
International audience An up-to-date map of the Antarctic Circumpolar Current (ACC) fronts is constructed from the latest version of mean dynamic topography (MDT) from satellite altimetry and reveals the narrowest ACC width in the Udintsev Fracture Zone (UFZ), with the strongest concentration of the...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , , , , , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2019
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Subjects: | |
Online Access: | https://hal.sorbonne-universite.fr/hal-02281966 https://hal.sorbonne-universite.fr/hal-02281966/document https://hal.sorbonne-universite.fr/hal-02281966/file/Park_et_al-2019-Journal_of_Geophysical_Research__Oceans.pdf https://doi.org/10.1029/2019JC015024 |
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ftccsdartic:oai:HAL:hal-02281966v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Park, Young-Hyang Park, T. Kim, T.-W. Lee, S.-H. Hong, C.-S. Lee, Jae Hak Rio, Marie-Hélène Pujol, Marie-Isabelle Ballarotta, M. Durand, Isabelle Provost, Christine Observations of the Antarctic Circumpolar Current Over the Udintsev Fracture Zone, the Narrowest Choke Point in the Southern Ocean |
topic_facet |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience An up-to-date map of the Antarctic Circumpolar Current (ACC) fronts is constructed from the latest version of mean dynamic topography (MDT) from satellite altimetry and reveals the narrowest ACC width in the Udintsev Fracture Zone (UFZ), with the strongest concentration of the three major ACC fronts within a limited distance as short as 170 km, about 40% narrower than that at Drake Passage. At 144°W, at the entrance of the UFZ, which lies between the Pacific-Antarctic Ridge (PAR) and its eastwardly offset segment (offset PAR segment), there is a triple confluence of the Subantarctic Front, Polar Front, and Southern ACC Front. Downstream of this longitude, the Subantarctic Front progressively meanders northward over the relatively shallow offset PAR segment before channeling through the Eltanin Fracture Zone, thus diverging from the Polar Front which proceeds through the UFZ. In situ observations from two recent cruises at 144°W confirm the satellite altimetry-derived frontal circulation in the UFZ region and yield a baroclinic transport relative to the bottom of 113 × 10 6 m 3 /s, comparable to that through Drake Passage. The hydrographic sections show no Antarctic bottom water colder than 0.2°C. Characteristics of major water masses are described, and the implications for their potential downstream modifications at Drake Passage are discussed in terms of the meridional overturning circulation across the ACC. Mesoscale eddy activity with periods shorter than 90 days is predominantly concentrated in the immediate downstream area of the offset PAR segment, suggesting a substantial poleward eddy heat flux there. |
author2 |
Austral, Boréal et Carbone (ABC) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) 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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-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)-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 de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU) Korea Polar Research Institute (KOPRI) Korea Institute of Ocean Science and Technology (KIOST) Collecte Localisation Satellites (CLS) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National d'Études Spatiales Toulouse (CNES) |
format |
Article in Journal/Newspaper |
author |
Park, Young-Hyang Park, T. Kim, T.-W. Lee, S.-H. Hong, C.-S. Lee, Jae Hak Rio, Marie-Hélène Pujol, Marie-Isabelle Ballarotta, M. Durand, Isabelle Provost, Christine |
author_facet |
Park, Young-Hyang Park, T. Kim, T.-W. Lee, S.-H. Hong, C.-S. Lee, Jae Hak Rio, Marie-Hélène Pujol, Marie-Isabelle Ballarotta, M. Durand, Isabelle Provost, Christine |
author_sort |
Park, Young-Hyang |
title |
Observations of the Antarctic Circumpolar Current Over the Udintsev Fracture Zone, the Narrowest Choke Point in the Southern Ocean |
title_short |
Observations of the Antarctic Circumpolar Current Over the Udintsev Fracture Zone, the Narrowest Choke Point in the Southern Ocean |
title_full |
Observations of the Antarctic Circumpolar Current Over the Udintsev Fracture Zone, the Narrowest Choke Point in the Southern Ocean |
title_fullStr |
Observations of the Antarctic Circumpolar Current Over the Udintsev Fracture Zone, the Narrowest Choke Point in the Southern Ocean |
title_full_unstemmed |
Observations of the Antarctic Circumpolar Current Over the Udintsev Fracture Zone, the Narrowest Choke Point in the Southern Ocean |
title_sort |
observations of the antarctic circumpolar current over the udintsev fracture zone, the narrowest choke point in the southern ocean |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.sorbonne-universite.fr/hal-02281966 https://hal.sorbonne-universite.fr/hal-02281966/document https://hal.sorbonne-universite.fr/hal-02281966/file/Park_et_al-2019-Journal_of_Geophysical_Research__Oceans.pdf https://doi.org/10.1029/2019JC015024 |
long_lat |
ENVELOPE(-130.000,-130.000,-54.000,-54.000) ENVELOPE(-145.000,-145.000,-57.000,-57.000) |
geographic |
Antarctic Drake Passage Eltanin Fracture Zone Pacific Southern Ocean The Antarctic Udintsev Fracture Zone |
geographic_facet |
Antarctic Drake Passage Eltanin Fracture Zone Pacific Southern Ocean The Antarctic Udintsev Fracture Zone |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.sorbonne-universite.fr/hal-02281966 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2019, 124 (7), pp.4511-4528. ⟨10.1029/2019JC015024⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JC015024 hal-02281966 https://hal.sorbonne-universite.fr/hal-02281966 https://hal.sorbonne-universite.fr/hal-02281966/document https://hal.sorbonne-universite.fr/hal-02281966/file/Park_et_al-2019-Journal_of_Geophysical_Research__Oceans.pdf WOS: 000482059700009 doi:10.1029/2019JC015024 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2019JC015024 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
124 |
container_issue |
7 |
container_start_page |
4511 |
op_container_end_page |
4528 |
_version_ |
1766099866498367488 |
spelling |
ftccsdartic:oai:HAL:hal-02281966v1 2023-05-15T13:37:57+02:00 Observations of the Antarctic Circumpolar Current Over the Udintsev Fracture Zone, the Narrowest Choke Point in the Southern Ocean Park, Young-Hyang Park, T. Kim, T.-W. Lee, S.-H. Hong, C.-S. Lee, Jae Hak Rio, Marie-Hélène Pujol, Marie-Isabelle Ballarotta, M. Durand, Isabelle Provost, Christine Austral, Boréal et Carbone (ABC) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) 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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-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)-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 de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU) Korea Polar Research Institute (KOPRI) Korea Institute of Ocean Science and Technology (KIOST) Collecte Localisation Satellites (CLS) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National d'Études Spatiales Toulouse (CNES) 2019 https://hal.sorbonne-universite.fr/hal-02281966 https://hal.sorbonne-universite.fr/hal-02281966/document https://hal.sorbonne-universite.fr/hal-02281966/file/Park_et_al-2019-Journal_of_Geophysical_Research__Oceans.pdf https://doi.org/10.1029/2019JC015024 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JC015024 hal-02281966 https://hal.sorbonne-universite.fr/hal-02281966 https://hal.sorbonne-universite.fr/hal-02281966/document https://hal.sorbonne-universite.fr/hal-02281966/file/Park_et_al-2019-Journal_of_Geophysical_Research__Oceans.pdf WOS: 000482059700009 doi:10.1029/2019JC015024 info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.sorbonne-universite.fr/hal-02281966 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2019, 124 (7), pp.4511-4528. ⟨10.1029/2019JC015024⟩ [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.1029/2019JC015024 2021-12-19T01:49:40Z International audience An up-to-date map of the Antarctic Circumpolar Current (ACC) fronts is constructed from the latest version of mean dynamic topography (MDT) from satellite altimetry and reveals the narrowest ACC width in the Udintsev Fracture Zone (UFZ), with the strongest concentration of the three major ACC fronts within a limited distance as short as 170 km, about 40% narrower than that at Drake Passage. At 144°W, at the entrance of the UFZ, which lies between the Pacific-Antarctic Ridge (PAR) and its eastwardly offset segment (offset PAR segment), there is a triple confluence of the Subantarctic Front, Polar Front, and Southern ACC Front. Downstream of this longitude, the Subantarctic Front progressively meanders northward over the relatively shallow offset PAR segment before channeling through the Eltanin Fracture Zone, thus diverging from the Polar Front which proceeds through the UFZ. In situ observations from two recent cruises at 144°W confirm the satellite altimetry-derived frontal circulation in the UFZ region and yield a baroclinic transport relative to the bottom of 113 × 10 6 m 3 /s, comparable to that through Drake Passage. The hydrographic sections show no Antarctic bottom water colder than 0.2°C. Characteristics of major water masses are described, and the implications for their potential downstream modifications at Drake Passage are discussed in terms of the meridional overturning circulation across the ACC. Mesoscale eddy activity with periods shorter than 90 days is predominantly concentrated in the immediate downstream area of the offset PAR segment, suggesting a substantial poleward eddy heat flux there. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Drake Passage Eltanin Fracture Zone ENVELOPE(-130.000,-130.000,-54.000,-54.000) Pacific Southern Ocean The Antarctic Udintsev Fracture Zone ENVELOPE(-145.000,-145.000,-57.000,-57.000) Journal of Geophysical Research: Oceans 124 7 4511 4528 |