Structure and causes of the pulsation mode in the Antarctic circumpolar current South of Australia
Auteur correspondant: carolina.dufour@hmg.inpg.fr International audience The subsurface variability of potential temperature and salinity south of Australia along 130°E is studied over a 25-yr period (1980–2004). The study is done with fields provided by a global eddy-permitting model of the DRAKKAR...
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ftunigrenoble:oai:HAL:hal-01893898v1 2024-05-12T07:53:26+00:00 Structure and causes of the pulsation mode in the Antarctic circumpolar current South of Australia Dufour, C. Le Sommer, J. Penduff, T. Barnier, B. England, M. Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) Florida State University Tallahassee (FSU) Climate Change Research Centre, ARC Centre of Excellence for Climate System Science, University of New South Wales, Level 4 Matthews Bldg., Kensington, NSW 2052, Australia 2011-02 https://hal.science/hal-01893898 https://hal.science/hal-01893898/document https://hal.science/hal-01893898/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Structure%20and%20Causes%20of%20the%20Pulsation%20Mode%20in%20the%20Antarctic%20Circumpolar%20Current%20South%20of%20Australia.pdf https://doi.org/10.1175/2010JPO4193.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/2010JPO4193.1 hal-01893898 https://hal.science/hal-01893898 https://hal.science/hal-01893898/document https://hal.science/hal-01893898/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Structure%20and%20Causes%20of%20the%20Pulsation%20Mode%20in%20the%20Antarctic%20Circumpolar%20Current%20South%20of%20Australia.pdf doi:10.1175/2010JPO4193.1 info:eu-repo/semantics/OpenAccess ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-01893898 Journal of Physical Oceanography, 2011, 41 (2), pp.253 - 268. ⟨10.1175/2010JPO4193.1⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2011 ftunigrenoble https://doi.org/10.1175/2010JPO4193.1 2024-04-18T03:15:32Z Auteur correspondant: carolina.dufour@hmg.inpg.fr International audience The subsurface variability of potential temperature and salinity south of Australia along 130°E is studied over a 25-yr period (1980–2004). The study is done with fields provided by a global eddy-permitting model of the DRAKKAR project forced by atmospheric reanalysis. The analysis performed by C. Sun and D. R. Watts with in situ hydrographic data is repeated. Sun and Watts have investigated the EOF modes in streamfunction space along the World Ocean Circulation Experiment (WOCE) SR3 section. In particular, they found that an EOF mode, which they called the “pulsation mode,” strongly dominates subsurface thermohaline variations. Here, it is found that, in the model, an EOF mode with spatial structure similar to the Sun and Watts pulsation mode dominates subsurface thermohaline variations in streamfunction space. The mode displays a maximum of variability at the Subantarctic Front (SAF) between Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW). The associated time series exhibits an intermittent interseasonal frequency (3–6 months), especially during three periods (1983–84, 1990, and 1994–96). Some energy is also found with a 4-yr period.Further analyses reveal that the pulsation mode can also be observed in physical space. The pulsation mode is found to be related to movements of the SAF constrained by the bathymetry of the Southeast Indian Ridge. The pulsation mode displays many similarities with cold-core eddy events rather than being related to variations of the westerly wind stress, as previously proposed. The impact of those events on SAMW properties remains unclear. Article in Journal/Newspaper Antarc* Antarctic Université Grenoble Alpes: HAL Antarctic The Antarctic Indian Southeast Indian Ridge ENVELOPE(110.000,110.000,-50.000,-50.000) Journal of Physical Oceanography 41 2 253 268 |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Dufour, C. Le Sommer, J. Penduff, T. Barnier, B. England, M. Structure and causes of the pulsation mode in the Antarctic circumpolar current South of Australia |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
Auteur correspondant: carolina.dufour@hmg.inpg.fr International audience The subsurface variability of potential temperature and salinity south of Australia along 130°E is studied over a 25-yr period (1980–2004). The study is done with fields provided by a global eddy-permitting model of the DRAKKAR project forced by atmospheric reanalysis. The analysis performed by C. Sun and D. R. Watts with in situ hydrographic data is repeated. Sun and Watts have investigated the EOF modes in streamfunction space along the World Ocean Circulation Experiment (WOCE) SR3 section. In particular, they found that an EOF mode, which they called the “pulsation mode,” strongly dominates subsurface thermohaline variations. Here, it is found that, in the model, an EOF mode with spatial structure similar to the Sun and Watts pulsation mode dominates subsurface thermohaline variations in streamfunction space. The mode displays a maximum of variability at the Subantarctic Front (SAF) between Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW). The associated time series exhibits an intermittent interseasonal frequency (3–6 months), especially during three periods (1983–84, 1990, and 1994–96). Some energy is also found with a 4-yr period.Further analyses reveal that the pulsation mode can also be observed in physical space. The pulsation mode is found to be related to movements of the SAF constrained by the bathymetry of the Southeast Indian Ridge. The pulsation mode displays many similarities with cold-core eddy events rather than being related to variations of the westerly wind stress, as previously proposed. The impact of those events on SAMW properties remains unclear. |
author2 |
Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) Florida State University Tallahassee (FSU) Climate Change Research Centre, ARC Centre of Excellence for Climate System Science, University of New South Wales, Level 4 Matthews Bldg., Kensington, NSW 2052, Australia |
format |
Article in Journal/Newspaper |
author |
Dufour, C. Le Sommer, J. Penduff, T. Barnier, B. England, M. |
author_facet |
Dufour, C. Le Sommer, J. Penduff, T. Barnier, B. England, M. |
author_sort |
Dufour, C. |
title |
Structure and causes of the pulsation mode in the Antarctic circumpolar current South of Australia |
title_short |
Structure and causes of the pulsation mode in the Antarctic circumpolar current South of Australia |
title_full |
Structure and causes of the pulsation mode in the Antarctic circumpolar current South of Australia |
title_fullStr |
Structure and causes of the pulsation mode in the Antarctic circumpolar current South of Australia |
title_full_unstemmed |
Structure and causes of the pulsation mode in the Antarctic circumpolar current South of Australia |
title_sort |
structure and causes of the pulsation mode in the antarctic circumpolar current south of australia |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/hal-01893898 https://hal.science/hal-01893898/document https://hal.science/hal-01893898/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Structure%20and%20Causes%20of%20the%20Pulsation%20Mode%20in%20the%20Antarctic%20Circumpolar%20Current%20South%20of%20Australia.pdf https://doi.org/10.1175/2010JPO4193.1 |
long_lat |
ENVELOPE(110.000,110.000,-50.000,-50.000) |
geographic |
Antarctic The Antarctic Indian Southeast Indian Ridge |
geographic_facet |
Antarctic The Antarctic Indian Southeast Indian Ridge |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-01893898 Journal of Physical Oceanography, 2011, 41 (2), pp.253 - 268. ⟨10.1175/2010JPO4193.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/2010JPO4193.1 hal-01893898 https://hal.science/hal-01893898 https://hal.science/hal-01893898/document https://hal.science/hal-01893898/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20Structure%20and%20Causes%20of%20the%20Pulsation%20Mode%20in%20the%20Antarctic%20Circumpolar%20Current%20South%20of%20Australia.pdf doi:10.1175/2010JPO4193.1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/2010JPO4193.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
41 |
container_issue |
2 |
container_start_page |
253 |
op_container_end_page |
268 |
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