SOIL-MOISTURE ATMOSPHERE INTERACTION IN A MOIST SEMIGEOSTROPHIC MODEL OF BAROCLINIC INSTABILITY
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abstract
Attention is focused on the dynamical coupling between the soil moisture and atmospheric processes, such as in the present of a growing moist baroclinic wave. The local effect consists of modifying the vertical lapse rates of dry and equivalent potential temperatures in the troposphere. The large-scale effect is realized through the global dynamics of the baroclinic wave and in particular through the rates of mass and energy advection and the strength of the ageostrophic frontal circulation, which depend strongly themselves on the temperature lapse rates. Both mechanisms are found to be substantially dependent on both the local moisture content of the soil and on the large-scale moisture differences, highlighting their feedback on precipitation. -from Authors
