Antarctic Intermediate and Subantarctic Mode waters response to the Southern Annular Mode : processes involved and the sea-ice role
Recent climate trends show a warming and freshening of the surface layers in the region of the Antarctic Circumpolar Current (ACC). Over the same period, the westerlies driving the circulation of the Southern Ocean have significantly increased. This increase is partly due to the intensification of t...
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Other Authors: | , , , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2014
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Subjects: | |
Online Access: | https://theses.hal.science/tel-01551769 https://theses.hal.science/tel-01551769/document https://theses.hal.science/tel-01551769/file/MAINSANT_2014_archivage.pdf |
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ftunigrenoble:oai:HAL:tel-01551769v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
French |
topic |
Southern Ocean Air-sea heat flux Air-sea freshwater flux Southern Annular Mode Oceanic water masses Regional numerical sea ice-ocean coupled model Océan Austral Flux air-mer de chaleur et d'eau douce Mode Annulaire Austral Masses d'eau océaniques Modèle numérique régional couplé océan-glace de mer [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Southern Ocean Air-sea heat flux Air-sea freshwater flux Southern Annular Mode Oceanic water masses Regional numerical sea ice-ocean coupled model Océan Austral Flux air-mer de chaleur et d'eau douce Mode Annulaire Austral Masses d'eau océaniques Modèle numérique régional couplé océan-glace de mer [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Mainsant, Gildas Antarctic Intermediate and Subantarctic Mode waters response to the Southern Annular Mode : processes involved and the sea-ice role |
topic_facet |
Southern Ocean Air-sea heat flux Air-sea freshwater flux Southern Annular Mode Oceanic water masses Regional numerical sea ice-ocean coupled model Océan Austral Flux air-mer de chaleur et d'eau douce Mode Annulaire Austral Masses d'eau océaniques Modèle numérique régional couplé océan-glace de mer [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
Recent climate trends show a warming and freshening of the surface layers in the region of the Antarctic Circumpolar Current (ACC). Over the same period, the westerlies driving the circulation of the Southern Ocean have significantly increased. This increase is partly due to the intensification of the Southern Annular Mode (SAM), the main mode of atmospheric variability south of 20°S. In this thesis, we are interested in understanding the effects of the positive trend of the SAM onto the properties of water masses formed in the region of the ACC. To do so, we implement a strategy of regional coupled ocean-sea ice simulations forced by a series of atmospheric disturbance scenarios.These scenarios are constructed from atmospheric reanalyses in order to describe the various components (dynamic and thermodynamic) of the changes related to the SAM. In response to the increase of the SAM, the simulations show a significant salinification of the ocean mixed layer and of the mode water (SAMW) and intermediate water (AAIW).Most of these changes can be attributed to the dynamic components of the SAM. In Seasonal Ice Zone, the thermodynamic components of the SAM can play an important part (especially in Amundsen Sea and Weddell Sea). The simulations also show the key role played by sea ice in mediating atmospheric changes toward the interior ocean.These simulation results suggest that SAM is not the only driver of recent climate trends in the Southern Ocean. Les tendances climatiques récentes montrent un réchauffement et un adoucissement des couches de surface dans la région du courant circumpolaire antarctique (ACC).Sur la même période, les vents d'ouest pilotant la circulation de l'océan Austral ont significativement augmentés. Cette augmentation est en partie liée à l'intensification du mode annulaire austral (SAM), principal mode de variabilité atmosphérique au sud de 20°S. Dans cette thèse, on s'intéresse à comprendre les effets de la tendance positive du SAM sur les propriétés des masses d'eau formées dans la ... |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 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) Université de Grenoble Hubert Gallée Julien Le Sommer Bernard Barnier |
format |
Doctoral or Postdoctoral Thesis |
author |
Mainsant, Gildas |
author_facet |
Mainsant, Gildas |
author_sort |
Mainsant, Gildas |
title |
Antarctic Intermediate and Subantarctic Mode waters response to the Southern Annular Mode : processes involved and the sea-ice role |
title_short |
Antarctic Intermediate and Subantarctic Mode waters response to the Southern Annular Mode : processes involved and the sea-ice role |
title_full |
Antarctic Intermediate and Subantarctic Mode waters response to the Southern Annular Mode : processes involved and the sea-ice role |
title_fullStr |
Antarctic Intermediate and Subantarctic Mode waters response to the Southern Annular Mode : processes involved and the sea-ice role |
title_full_unstemmed |
Antarctic Intermediate and Subantarctic Mode waters response to the Southern Annular Mode : processes involved and the sea-ice role |
title_sort |
antarctic intermediate and subantarctic mode waters response to the southern annular mode : processes involved and the sea-ice role |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://theses.hal.science/tel-01551769 https://theses.hal.science/tel-01551769/document https://theses.hal.science/tel-01551769/file/MAINSANT_2014_archivage.pdf |
geographic |
Amundsen Sea Antarctic Austral Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Amundsen Sea Antarctic Austral Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Amundsen Sea Antarc* Antarctic Antarctique* Sea ice Southern Ocean Weddell Sea |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctique* Sea ice Southern Ocean Weddell Sea |
op_source |
https://theses.hal.science/tel-01551769 Océanographie. Université de Grenoble, 2014. Français. ⟨NNT : 2014GRENU060⟩ |
op_relation |
NNT: 2014GRENU060 tel-01551769 https://theses.hal.science/tel-01551769 https://theses.hal.science/tel-01551769/document https://theses.hal.science/tel-01551769/file/MAINSANT_2014_archivage.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1798838263208738816 |
spelling |
ftunigrenoble:oai:HAL:tel-01551769v1 2024-05-12T07:52:52+00:00 Antarctic Intermediate and Subantarctic Mode waters response to the Southern Annular Mode : processes involved and the sea-ice role Réponse des masses d'eau intermédiaires et modales de l'océan Austral au mode annulaire austral : les processus en jeu et rôle de la glace de mer Mainsant, Gildas Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 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) Université de Grenoble Hubert Gallée Julien Le Sommer Bernard Barnier 2014-11-28 https://theses.hal.science/tel-01551769 https://theses.hal.science/tel-01551769/document https://theses.hal.science/tel-01551769/file/MAINSANT_2014_archivage.pdf fr fre HAL CCSD NNT: 2014GRENU060 tel-01551769 https://theses.hal.science/tel-01551769 https://theses.hal.science/tel-01551769/document https://theses.hal.science/tel-01551769/file/MAINSANT_2014_archivage.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-01551769 Océanographie. Université de Grenoble, 2014. Français. ⟨NNT : 2014GRENU060⟩ Southern Ocean Air-sea heat flux Air-sea freshwater flux Southern Annular Mode Oceanic water masses Regional numerical sea ice-ocean coupled model Océan Austral Flux air-mer de chaleur et d'eau douce Mode Annulaire Austral Masses d'eau océaniques Modèle numérique régional couplé océan-glace de mer [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/doctoralThesis Theses 2014 ftunigrenoble 2024-04-18T04:09:38Z Recent climate trends show a warming and freshening of the surface layers in the region of the Antarctic Circumpolar Current (ACC). Over the same period, the westerlies driving the circulation of the Southern Ocean have significantly increased. This increase is partly due to the intensification of the Southern Annular Mode (SAM), the main mode of atmospheric variability south of 20°S. In this thesis, we are interested in understanding the effects of the positive trend of the SAM onto the properties of water masses formed in the region of the ACC. To do so, we implement a strategy of regional coupled ocean-sea ice simulations forced by a series of atmospheric disturbance scenarios.These scenarios are constructed from atmospheric reanalyses in order to describe the various components (dynamic and thermodynamic) of the changes related to the SAM. In response to the increase of the SAM, the simulations show a significant salinification of the ocean mixed layer and of the mode water (SAMW) and intermediate water (AAIW).Most of these changes can be attributed to the dynamic components of the SAM. In Seasonal Ice Zone, the thermodynamic components of the SAM can play an important part (especially in Amundsen Sea and Weddell Sea). The simulations also show the key role played by sea ice in mediating atmospheric changes toward the interior ocean.These simulation results suggest that SAM is not the only driver of recent climate trends in the Southern Ocean. Les tendances climatiques récentes montrent un réchauffement et un adoucissement des couches de surface dans la région du courant circumpolaire antarctique (ACC).Sur la même période, les vents d'ouest pilotant la circulation de l'océan Austral ont significativement augmentés. Cette augmentation est en partie liée à l'intensification du mode annulaire austral (SAM), principal mode de variabilité atmosphérique au sud de 20°S. Dans cette thèse, on s'intéresse à comprendre les effets de la tendance positive du SAM sur les propriétés des masses d'eau formées dans la ... Doctoral or Postdoctoral Thesis Amundsen Sea Antarc* Antarctic Antarctique* Sea ice Southern Ocean Weddell Sea Université Grenoble Alpes: HAL Amundsen Sea Antarctic Austral Southern Ocean The Antarctic Weddell Weddell Sea |