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Large‐eddy simulations of the diurnal cycle of shallow convection and cloudiness over the tropical Indian Ocean

A 3‐D non‐hydrostatic model (EULAG) with warm‐rain bulk microphysics was used to study the diurnal cycle of shallow convection and cloudiness in the trade wind boundary layer over the Indian Ocean. Simulations were initialized with soundings obtained during the Indian Ocean Experiment (INDOEX). In the absence of diurnally varying large‐scale forcing, the simulated diurnal cycles of vertical velocities, turbulent fluxes, condensation rate and cloudiness were characterized by distinct daytime reductions. Solar heating in the boundary layer stabilized the air, decreased the relative humidity and, therefore, suppressed cloud‐layer turbulence and shallow cumulus convection. As a result, the condensation rate and cloud amount were reduced. Stronger thermal updraughts and turbulent fluxes caused by solar heating in the mixed layer triggered the recovery of cloudiness in the afternoon when the instability in the cloud layer increased.