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La circulation océanique autour du plateau de Kerguelen: de l'observation à la modélisation

Abstract : Due to its great meridional extent and relatively shallow depth, the Kerguelen Plateau constitutes a major barrier to the eastward flowing Antarctic Circumpolar Current (ACC) in the Indian sector of the Southern Ocean. While most of the ACC transport is deflected north of the Kerguelen Islands, the remainder (50 x 10 m3 s-1) must pass south of the islands, most probably through the Fawn Trough (56°S, 77°E, 2650 m) and Princess Elizabeth Trough (64°S, 82°E, 3650 m). However, our knowledge of the circulation around the Kerguelen Plateau has long been hampered by the lack of observations in this remote area. The goal of this thesis is to improve our knowledge of the mean circulation around the Kerguelen Plateau. A large set of oceanographic tools has thus been used, including the analysis of available observations as well as the use of state-of-the-art numerical models. Hydrographic data obtained using instrumented elephant seals are presented in details, together with a new procedure of calibration and validation of these data. The new circulation scheme obtained from observation analysis is then used to validate a realistic numerical simulation. The importance of deep and bottom water mass properties as well as of the bathymetry for shaping the circulation is outlined.
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Contributor : Fabien Roquet Connect in order to contact the contributor
Submitted on : Thursday, November 12, 2009 - 2:02:28 PM
Last modification on : Friday, August 5, 2022 - 11:54:41 AM
Long-term archiving on: : Thursday, June 17, 2010 - 6:03:48 PM


  • HAL Id : tel-00431483, version 1


Fabien Roquet. La circulation océanique autour du plateau de Kerguelen: de l'observation à la modélisation. Océan, Atmosphère. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00431483⟩



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