摘要
用文（Ⅰ）积层混合云数值模式及暴雨云的平均大气层结模拟研究了暴雨积层混合云的演变过程、两种云的相互作用、云体结构及降水特征，并分析了暴雨产生的物理原因。结果表明，在积层混合云中，当对流发展时其周围层状云减弱甚至消散，层状云的降水强度随着离开对流云距离增大而增大。数值试验说明：层状云给积云提供良好的发展条件，饱和的环境及伴随层状云的辐合场使对流云具有长生命期、产生持续性的高强度降水和间歇性的特高强度降水；积层混合云是一非常有效的降水系统，这些及冰相微物理过程是暴雨产生的主要物理原因。
Using numerical model of mixed convective-stratiform cloud (MCS) in part (Ⅰ) in this paper and the averaged stratification of torrential rain processes. evolution processes, interaction of the two kinds of clouds, structure and the precipitation features in MCS to produce heavy rain are simulated and studied. and physical reasons of producing torrential rain are analysed. The results indicate that stratiform cloud surrounding convective cloud weakens and dissipates in developing and enhancing of the convective cloud, rainfall rate and water content of the stratiform cloud increase from near the convective cloud to lateral boundary.The numerical experiments find out that stratiform cloud provides a benificial developing environment for convective cloud, and saturated environment and the convergence field in the stratiform cloud make the convective cloud has longer life cycle, produce lasting rainfall with high intensity and intermittent precipitation with ultra-high intensity. these and the ice phase microphysical processes are main factors for torrential rain formation and MCS is a very effective preipitation system.
出处
《气象学报》
CSCD
北大核心
1996年第6期661-674,共14页
Acta Meteorologica Sinica
基金
国家"八五"攻关课题
关键词
云
积层混合云
数值模拟
相互作用
暴雨
降水
Cloud interaction. Precipitation features, Formation mechanism of heavy rain.
