MODIFIED MASS FLUX CUMULUS CONVECTIVE PARAMETERIZATION SCHEME AND ITS SIMULATION EXPERIMENT—PART II:CUMULUS CONVECTION ACTIVITIES SIMULATED FROM THREE SCHEMES AND SENSITIVITY EXPERIMENTS BY USE OF MASS FLUX SCHEME

By comparison of simulated cumulus convection processes in RegCM2,using the Kuo scheme,the Grell scheme and the mass flux scheme (MFS),it is found that the MFS can simulate thecumulus heating and moistening very well.A series of sensitivity tests show that the parametersfor specifying the conversion coefficient from cloud droplets to raindrops,the turbulententrainment and detrainment rates in updrafts anddowndrafts,and the intensity of thedowndraftshave different degrees of influence upon the cumulus convection.Therefore.it is quite importantfor cumulus parameterization scheme to define these parameters as accurately as possible.