NUMERICAL SIMULATION OF MICROPHYSICAL PROCESSES IN CUMULONIMBUS——PART Ⅰ:MICROPHYSICAL MODEL

A comprehensive parameterized model of microphysical processes in cumulonimbus clouds is presented.The transformation rates of the water contents and number concentrations of the cloud droplets,rain drops,ice crystals,graupels and hails are deduced on theoretical and experimental results for 26 kinds of microphysical processes,which include condensation,deposition,evaporation,collection,ice nucleation,ice muliplication,melting,freezing,and autoconversions of cloud to rain,ice to graupel and graupel to hail.