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Theses

Influence de l'hydrologie souterraine sur la modélisation du climat à l'échelle régionale et globale

Abstract : General Circulation Models (GCM) are tools which allow studying climate at large scale. Water and energy budget over continental surface are calculated by Land Surface Model (LSM). Interest on using a sophistical LSM to simulate earth climate grew up last years, in particular in transition area, where evaporation is limited on one side by energy and on other side by available water. The instrumented site of SIRTA observes many atmospheric variables and allows validating a climate model on one point. The SIRTA have also soil moisture data which are used for the first time in this thesis. These data reveal a shallow water table, according to geophysical campaign conducted during this thesis. Data from SIRTA are confronted to regional simulations produced with the LSM ORCHIDEE coupled to an atmospheric model. We develop the possibility to impose a water table in the soil modeled by ORCHIDEE, which allows maintaining evaporation during summer at the SIRTA, according to observations. We explore different hydrologic hypothesis which conduct to an evaporation increase at Western European scale and also involve precipitation increase and air cooling. Theses hypothesis are also tested in global simulations to study effects on climate and on climate change due to an increase of greenhouse gases.
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https://tel.archives-ouvertes.fr/tel-00934826
Contributor : Aurélien Campoy <>
Submitted on : Wednesday, January 22, 2014 - 4:09:52 PM
Last modification on : Friday, October 23, 2020 - 4:48:07 PM
Long-term archiving on: : Wednesday, April 23, 2014 - 9:40:19 AM

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  • HAL Id : tel-00934826, version 1

Citation

Aurélien Campoy. Influence de l'hydrologie souterraine sur la modélisation du climat à l'échelle régionale et globale. Sciences de la Terre. Université Pierre et Marie Curie - Paris VI, 2013. Français. ⟨tel-00934826⟩

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