NUMERICAL EXPERIMENTS ON THE FORMING MECHANISMS OF LOW LATITUDE CIRCULATION CELLS AND PRECIPITATION DURING EAST ASIAN COLD SURGE

In this paper,the forming mecbanisms of low latitude circulation cells and precipitation during east Asian cold surge have been studied by using a five-layer primitive equation model.Numerical experiments show that:in low latitude,the cumulus convection effects can intensify the north-east monsoon wind and north-east trade wind,keep ITCZ from transferring southward further.Numerical results indicate that the winter monsoon PreciPitation in Indonesia and North-Australia can exist independently.To form the North-Australian summer monsoon wind and its precipitation,both the South China Sea(SCS)cold surge and the west Paci-fic north-east cross-equatorial trade wind can be of importance.Numerical results also indicate that:the development of cumulus convection,triggered by the SCS cold surge,is a fundamental factor in forming the strong monsoon preciPitation and low-level stationary disturbances over Indonesia and Borneo.The lands of Indonesia and Borneo and the north-east trade wind disturbance are two important factors affecting the precipitation intensity.