Modelling the seasonal variability of the Antarctic Slope Current
One of the main features of the oceanic circulation along Antarctica is the Antarctic Slope Current (ASC). This circumpolar current flows westwards and contributes to communication between the three major oceanic basins around Antarctica. The ASC is not very well known due to remote location and the...
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ftunivlouvain:oai:dial.uclouvain.be:boreal:83951 2024-05-19T07:31:54+00:00 Modelling the seasonal variability of the Antarctic Slope Current Mathiot, Pierre Goosse, Hugues Fichefet, Thierry Barnier, B. Gallée, H. UCL - SST/ELI/ELIC - Earth & Climate CNRS/UJF Grenoble, France - Laboratoire des Ecoulements Geophysiques et Industriels (LEGI) 2011 http://hdl.handle.net/2078.1/83951 https://doi.org/10.5194/os-7-455-2011 eng eng Copernicus GmbH boreal:83951 http://hdl.handle.net/2078.1/83951 doi:10.5194/os-7-455-2011 urn:ISSN:1812-0784 urn:EISSN:1812-0792 info:eu-repo/semantics/restrictedAccess Ocean Science, Vol. 7, p. 455–470 (2011) CECI 1443 info:eu-repo/semantics/article 2011 ftunivlouvain https://doi.org/10.5194/os-7-455-2011 2024-04-24T01:44:43Z One of the main features of the oceanic circulation along Antarctica is the Antarctic Slope Current (ASC). This circumpolar current flows westwards and contributes to communication between the three major oceanic basins around Antarctica. The ASC is not very well known due to remote location and the presence of sea ice during several months, allowing in situ studies only during summertime. Moreover, only few modelling studies of this current have been carried out. Here, we investigate the sensitivity of this simulated current to four different resolutions in a coupled ocean-sea ice model and to two different atmospheric forcing sets. Two series of simulations are conducted. For the first series, global model configurations are run at coarse (2°) to eddy-permitting (0.25°) resolutions with the same atmospheric forcing. For the second series, simulations with two different atmospheric forcings are performed using a regional circumpolar configuration (south of 30° S) at 0.5° resolution. The first atmospheric forcing is based on a global atmospheric reanalysis and satellite data, while the second is based on a downscaling of the global atmospheric reanalysis by a regional atmospheric model calibrated to Antarctic meteorological conditions. Sensitivity experiments to resolution indicate that a minimum model resolution of 0.5° is needed to capture the dynamics of the ASC in terms of water mass transport and recirculation. Sensitivity experiments to atmospheric forcing fields shows that the wind speed along the Antarctic coast strongly controls the water mass transport and the seasonal cycle of the ASC. An increase in annual mean of easterlies by about 30%leads to an increase in the mean ASC transport by about 40 %. Similar effects are obtained on the seasonal cycle: using a wind forcing field with a larger seasonal cycle (+30 %) increases by more than 30% the amplitude of the seasonal cycle of the ASC. To confirm the importance of wind seasonal cycle, a simulation without wind speed seasonal cycle is carried out. ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice DIAL@UCLouvain (Université catholique de Louvain) Ocean Science 7 4 455 470 |
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Open Polar |
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DIAL@UCLouvain (Université catholique de Louvain) |
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ftunivlouvain |
language |
English |
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CECI 1443 |
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CECI 1443 Mathiot, Pierre Goosse, Hugues Fichefet, Thierry Barnier, B. Gallée, H. Modelling the seasonal variability of the Antarctic Slope Current |
topic_facet |
CECI 1443 |
description |
One of the main features of the oceanic circulation along Antarctica is the Antarctic Slope Current (ASC). This circumpolar current flows westwards and contributes to communication between the three major oceanic basins around Antarctica. The ASC is not very well known due to remote location and the presence of sea ice during several months, allowing in situ studies only during summertime. Moreover, only few modelling studies of this current have been carried out. Here, we investigate the sensitivity of this simulated current to four different resolutions in a coupled ocean-sea ice model and to two different atmospheric forcing sets. Two series of simulations are conducted. For the first series, global model configurations are run at coarse (2°) to eddy-permitting (0.25°) resolutions with the same atmospheric forcing. For the second series, simulations with two different atmospheric forcings are performed using a regional circumpolar configuration (south of 30° S) at 0.5° resolution. The first atmospheric forcing is based on a global atmospheric reanalysis and satellite data, while the second is based on a downscaling of the global atmospheric reanalysis by a regional atmospheric model calibrated to Antarctic meteorological conditions. Sensitivity experiments to resolution indicate that a minimum model resolution of 0.5° is needed to capture the dynamics of the ASC in terms of water mass transport and recirculation. Sensitivity experiments to atmospheric forcing fields shows that the wind speed along the Antarctic coast strongly controls the water mass transport and the seasonal cycle of the ASC. An increase in annual mean of easterlies by about 30%leads to an increase in the mean ASC transport by about 40 %. Similar effects are obtained on the seasonal cycle: using a wind forcing field with a larger seasonal cycle (+30 %) increases by more than 30% the amplitude of the seasonal cycle of the ASC. To confirm the importance of wind seasonal cycle, a simulation without wind speed seasonal cycle is carried out. ... |
author2 |
UCL - SST/ELI/ELIC - Earth & Climate CNRS/UJF Grenoble, France - Laboratoire des Ecoulements Geophysiques et Industriels (LEGI) |
format |
Article in Journal/Newspaper |
author |
Mathiot, Pierre Goosse, Hugues Fichefet, Thierry Barnier, B. Gallée, H. |
author_facet |
Mathiot, Pierre Goosse, Hugues Fichefet, Thierry Barnier, B. Gallée, H. |
author_sort |
Mathiot, Pierre |
title |
Modelling the seasonal variability of the Antarctic Slope Current |
title_short |
Modelling the seasonal variability of the Antarctic Slope Current |
title_full |
Modelling the seasonal variability of the Antarctic Slope Current |
title_fullStr |
Modelling the seasonal variability of the Antarctic Slope Current |
title_full_unstemmed |
Modelling the seasonal variability of the Antarctic Slope Current |
title_sort |
modelling the seasonal variability of the antarctic slope current |
publisher |
Copernicus GmbH |
publishDate |
2011 |
url |
http://hdl.handle.net/2078.1/83951 https://doi.org/10.5194/os-7-455-2011 |
genre |
Antarc* Antarctic Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Sea ice |
op_source |
Ocean Science, Vol. 7, p. 455–470 (2011) |
op_relation |
boreal:83951 http://hdl.handle.net/2078.1/83951 doi:10.5194/os-7-455-2011 urn:ISSN:1812-0784 urn:EISSN:1812-0792 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.5194/os-7-455-2011 |
container_title |
Ocean Science |
container_volume |
7 |
container_issue |
4 |
container_start_page |
455 |
op_container_end_page |
470 |
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1799469780797751296 |