Abstract
Land atmosphere interaction is a one of the important factor for Atmospheric Boundary Layer (ABL) processes, including cloud and precipitation formation. The present works thus aim to estimate the amount of soil moisture in idealized simulation affecting the shallow cumulus convection. Homogeneous soil moisture and horizontally homogeneous atmosphere is adapted. Potential of precipitation to occur on wetter or drier soil is quantified by running the model. Large Eddy Simulation (LES) with fully coupled to land surface and radiation model is used with different initial soil moisture percentage. Shallow cumulus cloud and rain shows different response under variety of soil moisture and wind conditions. Our study has showed that heat flux is influenced by soil moisture and wind condition. Decrease of soil moisture corresponds to decrease of net radiation and less difference of the maximum and minimum value of net radiation in diurnal cycle. It is also found that timing of convection does not vary significantly between the soil moisture availability of 100% - 60%, then it is gradually delayed for drier soil condition. Based on the study, it is concluded that cloud and rain formation process is influenced by the soil moisture and wind condition.
