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Rôle de l'inertie thermique et du couplage surface-atmosphère sur la valeur moyenne et le cycle diurne de la température de surface

Abstract : The main objectives of this study are to analyze the surface-atmosphere coupling mechanisms controlling the mean temperature and its diurnal cycle in the dry, humid and transitional zones. We show that thermal inertia plays a key role on the surface temperature in dry regions. The sensitivity of surface temperature to thermal inertia is high during the night but low during the day, impacting the mean surface temperature. We demonstrate that this effect is directly related to the instability of the planetary boundary layer, which is higher during the day compared to the night.Moreover, we emphasize the dual role of the solar forcing. The first one is to be the source of the diurnal contrast of the planetary boundary layer, which is the origin of the diurnal asymmetry of the surface temperature response to thermal inertia. The second one is to attenuate this effect, since the high asymmetry of the solar forcing foster the sensitivity of the day temperature compared to the night. In humid regions, we notice that the sensitivity of the surface temperature to thermal inertia is weak. This is due to the high values of the latent heat flux which controls the surface temperature. Nevertheless, we should point out that the thermal inertia may have an impact on the water budget at the surface, as it is the case in the Indian Monsoon region. In the transitional regions, we show that the relation between surface temperature and soil moisture is attenuated by about 20 to 50 % because of the dependency of the thermal inertia to soil water content. Hence, we suggest to integrated the effect of soil moisture on the thermal inertia in addition to its effect on evaporation.
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Sounia Sekoura Ait-Mesbah. Rôle de l'inertie thermique et du couplage surface-atmosphère sur la valeur moyenne et le cycle diurne de la température de surface. Sciences de la Terre. Université Pierre et Marie Curie - Paris VI, 2016. Français. ⟨NNT : 2016PA066136⟩. ⟨tel-02401932⟩

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