华南暴雨中云物理过程的数值研究

NUMERICAL STUDY ON CLOUD PHYSICAL PROCESSES OF HEAVY RAINFALL IN SOUTH CHINA

利用“海峡两岸及临近地区暴雨试验”(HUAMEX)取得的观测资料 ,使用高分辨非静力平衡中尺度数值模式MM5湿物理显式方案 ,模拟研究了 1 998年 5月 2 3～ 2 4日自粤北移向南海海岸的冷锋及锋前对流云团造成的华南暴雨中的云物理过程。结果表明 ,由于对流形成的具有冰相参加的冷云过程是华南暴雨形成发展的主要云物理过程 。

The heavy rainfall IOP case of the HUAMEX project during 23-24 May 1998 is simulated by using the non-hydrostatic meso-scale model MM5 (V2). Results show that the cold cloud process in which ice phase is coexisted with super-cooled liquid phase of cloud water plays the most important role in the formation and development of convective heavy rainfall in South China. The warm process (condensation and aggregation of liquid droplets) for the formation and development of rains in South China may play a role only for the non-convective precipitation with larger scale but not very strong intensity.