Influence du forçage atmosphérique sur la représentation de la glace de mer et des eaux de plateau en Antarctique dans une étude de modélisation numérique.

Abstract : The representation in numerical models of dense shelf water formation and interaction between sea ice, ocean, and atmosphere are essential for realistic simulation of bottom water mass and thermohaline circulation. The purpose of this work is to improve the representation of basic processes controling the formation and modification of shelf dense water in Antarctic like sea ice, ice shelves and forcing fields in NEMO ocean/sea-ice model. Series of realistic simulations show that fine tuning for the sea ice model, ice shelf parametrization, and katabatic winds correction have a positive impact on simulated sea ice, polynya and shelf water properties. However, these improvements are not able to correct all initial flaws. Other simulations are carried out, to test the effect of adifferent atmospheric forcing obtained from a regional downscaling of global reanalysis ERA40 in Antarctic area, performed with a regional mesoscale atmospheric model. This work shows that turbulent atmospheric variables (temperature, humidity and wind) have a strong positive impacts on sea ice and shelf water properties. This impact is greater that the tuning, parametrization and correction performed previously. Nevertheless, great effort are yet necessary to produce the regional forcing fields that sea-ice and ice shelves require.
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https://tel.archives-ouvertes.fr/tel-00375960
Contributor : Pierre Mathiot <>
Submitted on : Thursday, April 16, 2009 - 2:14:48 PM
Last modification on : Monday, September 2, 2019 - 2:46:05 PM
Long-term archiving on : Thursday, June 10, 2010 - 6:22:55 PM

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Pierre Mathiot. Influence du forçage atmosphérique sur la représentation de la glace de mer et des eaux de plateau en Antarctique dans une étude de modélisation numérique.. Océan, Atmosphère. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00375960⟩

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