Nineteen-year changes in surface salinity in the Southern Ocean south of Australia
International audience A 19-year time series of underway sea surface salinity (SSS) data from the SURVOSTRAL line between Hobart, Australia and Adelie Land, Antarctica has revealed the distinct patterns of seasonal and interannual variability in two key zones of the Southern Ocean: in the Subantarct...
Published in: | Journal of Marine Systems |
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Main Authors: | , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2014
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Online Access: | https://hal.archives-ouvertes.fr/hal-01021088 https://doi.org/10.1016/j.jmarsys.2013.09.011 |
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ftccsdartic:oai:HAL:hal-01021088v1 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
TASMANIA PROJECT MISSION cover GLOBAL PRECIPITATION MIXED-LAYER VARIABILITY Interannual variations Sea ice Seasonal variations Surface salinity [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
TASMANIA PROJECT MISSION cover GLOBAL PRECIPITATION MIXED-LAYER VARIABILITY Interannual variations Sea ice Seasonal variations Surface salinity [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Morrow, R. Kestenare, E. Nineteen-year changes in surface salinity in the Southern Ocean south of Australia |
topic_facet |
TASMANIA PROJECT MISSION cover GLOBAL PRECIPITATION MIXED-LAYER VARIABILITY Interannual variations Sea ice Seasonal variations Surface salinity [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience A 19-year time series of underway sea surface salinity (SSS) data from the SURVOSTRAL line between Hobart, Australia and Adelie Land, Antarctica has revealed the distinct patterns of seasonal and interannual variability in two key zones of the Southern Ocean: in the Subantarctic Zone and in the Antarctic Zone. Both regions show a weak seasonal freshening of the surface waters over the summer months, with surface waters becoming shallower, warmer and fresher during the summer heating cycle. In the region north of the Subantarctic Front, interannual variations in the summer SSS signature are linked to the latitudinal movements of the Subtropical Front. When this front shifts southward, more high salinity subtropical waters are brought into the domain. Rather than responding to local wind stress forcing, the interannual SSS variability is strongly linked to southward flow from eastern Tasmania (the Tasman outflow), whose decadal variability responds with a 2-3 year delay to remote wind forcing in the South Pacific (Hill et al., 2008). Over this period, variations in the local surface freshwater forcing make a minor contribution to the SURVOSTRAL SSS signature. There appears to be a regime shift in the surface forcing and the SSS response, before and after the large perturbation in 2001-2002. In the Antarctic Zone, the summer SSS signature shows distinct biannual variations that are correlated with upstream sea-ice coverage in the preceding spring. There is no significant correlation between local precipitation changes and the SURVOSTRAL SSS time series. Rather, the integrated effects of upstream sea-ice melt dominate the interannual variations in SSS at the SURVOSTRAL line. Finally, a simple 2D Lagrangian particle analysis shows that in some years the surface waters circulate for a longer time in the northern part of the domain, where their freshwater content may be reduced by mixing with the surrounding waters. (C) 2013 Elsevier B.V. All rights reserved. |
author2 |
Océan du Large et Variabilité Climatique (OLVAC) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Morrow, R. Kestenare, E. |
author_facet |
Morrow, R. Kestenare, E. |
author_sort |
Morrow, R. |
title |
Nineteen-year changes in surface salinity in the Southern Ocean south of Australia |
title_short |
Nineteen-year changes in surface salinity in the Southern Ocean south of Australia |
title_full |
Nineteen-year changes in surface salinity in the Southern Ocean south of Australia |
title_fullStr |
Nineteen-year changes in surface salinity in the Southern Ocean south of Australia |
title_full_unstemmed |
Nineteen-year changes in surface salinity in the Southern Ocean south of Australia |
title_sort |
nineteen-year changes in surface salinity in the southern ocean south of australia |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.archives-ouvertes.fr/hal-01021088 https://doi.org/10.1016/j.jmarsys.2013.09.011 |
geographic |
Antarctic Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Pacific Southern Ocean The Antarctic |
genre |
Adelie Land Antarc* Antarctic Antarctica Sea ice Southern Ocean |
genre_facet |
Adelie Land Antarc* Antarctic Antarctica Sea ice Southern Ocean |
op_source |
ISSN: 0924-7963 Journal of Marine Systems https://hal.archives-ouvertes.fr/hal-01021088 Journal of Marine Systems, Elsevier, 2014, 129, pp.472-483. ⟨10.1016/j.jmarsys.2013.09.011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2013.09.011 hal-01021088 https://hal.archives-ouvertes.fr/hal-01021088 doi:10.1016/j.jmarsys.2013.09.011 |
op_doi |
https://doi.org/10.1016/j.jmarsys.2013.09.011 |
container_title |
Journal of Marine Systems |
container_volume |
129 |
container_start_page |
472 |
op_container_end_page |
483 |
_version_ |
1766358512028352512 |
spelling |
ftccsdartic:oai:HAL:hal-01021088v1 2023-05-15T13:04:23+02:00 Nineteen-year changes in surface salinity in the Southern Ocean south of Australia Morrow, R. Kestenare, E. Océan du Large et Variabilité Climatique (OLVAC) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) 2014 https://hal.archives-ouvertes.fr/hal-01021088 https://doi.org/10.1016/j.jmarsys.2013.09.011 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2013.09.011 hal-01021088 https://hal.archives-ouvertes.fr/hal-01021088 doi:10.1016/j.jmarsys.2013.09.011 ISSN: 0924-7963 Journal of Marine Systems https://hal.archives-ouvertes.fr/hal-01021088 Journal of Marine Systems, Elsevier, 2014, 129, pp.472-483. ⟨10.1016/j.jmarsys.2013.09.011⟩ TASMANIA PROJECT MISSION cover GLOBAL PRECIPITATION MIXED-LAYER VARIABILITY Interannual variations Sea ice Seasonal variations Surface salinity [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2014 ftccsdartic https://doi.org/10.1016/j.jmarsys.2013.09.011 2021-10-24T13:12:39Z International audience A 19-year time series of underway sea surface salinity (SSS) data from the SURVOSTRAL line between Hobart, Australia and Adelie Land, Antarctica has revealed the distinct patterns of seasonal and interannual variability in two key zones of the Southern Ocean: in the Subantarctic Zone and in the Antarctic Zone. Both regions show a weak seasonal freshening of the surface waters over the summer months, with surface waters becoming shallower, warmer and fresher during the summer heating cycle. In the region north of the Subantarctic Front, interannual variations in the summer SSS signature are linked to the latitudinal movements of the Subtropical Front. When this front shifts southward, more high salinity subtropical waters are brought into the domain. Rather than responding to local wind stress forcing, the interannual SSS variability is strongly linked to southward flow from eastern Tasmania (the Tasman outflow), whose decadal variability responds with a 2-3 year delay to remote wind forcing in the South Pacific (Hill et al., 2008). Over this period, variations in the local surface freshwater forcing make a minor contribution to the SURVOSTRAL SSS signature. There appears to be a regime shift in the surface forcing and the SSS response, before and after the large perturbation in 2001-2002. In the Antarctic Zone, the summer SSS signature shows distinct biannual variations that are correlated with upstream sea-ice coverage in the preceding spring. There is no significant correlation between local precipitation changes and the SURVOSTRAL SSS time series. Rather, the integrated effects of upstream sea-ice melt dominate the interannual variations in SSS at the SURVOSTRAL line. Finally, a simple 2D Lagrangian particle analysis shows that in some years the surface waters circulate for a longer time in the northern part of the domain, where their freshwater content may be reduced by mixing with the surrounding waters. (C) 2013 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Adelie Land Antarc* Antarctic Antarctica Sea ice Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Pacific Southern Ocean The Antarctic Journal of Marine Systems 129 472 483 |