EFFECTS OF STRATIFORM CLOUD ON THE DEVELOPMENT OF CUMULUS CLOUD AND ITS PRECIPITATION

Based on the two-dimensional slab-symmetric model of cumulus clouds established by the authors,the development of the cumulus cloud and its precipitation in environments with and without the stratiform cloud present has been simulated numerically in almost the same atmospheric stratification.Results show that the presence of the stratiform cloud has a significant effect on the development of the cumulus cloud and the increae of its precipitation.The rainfall may increase by scveral to tens of times.It is believed that the convective-stratiform mixed cloud system may be important for producing heavy to torrential rain.This is in good agreement with what has been observed in the Meiyu frontal cloud system in recent investigations.