摘要
本文是梅雨锋暴雨个例的中尺度数值模拟研究（Ⅰ）—中α尺度双雨带一文的续篇。用（Ⅰ）文中时空稠密的模拟资料，分析了梅雨锋暴雨中β尺度对流系统的垂直结构和它的时间演变特征。结果指出：①中尺度对流系统的移动路径与中β尺度雨团的活动近于一致；②对流系统发展初期在700hPa以下的流场表现为气旋性弯曲或辐合，之后演变成较深厚的典型涡旋，在300hPa附近流场基本为扰动前的辐散气流；③进一步分析该中β尺度对流系统还是暖性对流涡柱，其直展对流的塌陷崩溃比发展迅速；④雨团的增强与涡柱中心高度降低相伴；⑤在中β尺度场中还有2～3小时量级的振荡起伏，这可以是更次一级系统的活动。
This paper is a continuous one with the title“A case studyon mesoscale unmerical simulation of heavy rainfall in Mei-yu front（Ⅰ）－meso－α－scale double rain belts”．It analyses the vertical structure of the meso-β-scale convective system of heavy rainfall In the Mei－yu front as well as its evolutionary characteteristics by using the simulated data with high resolution on time and space in paper（Ⅰ）．The results show that the meso－β－scale convective system tracks are basically consistent with activities of the meso-β-cale rain clusters．At the genesis stage of the convective system，the flow below 700hPa appears cycloniccurves or convergent and then becomes a typical deep vortex．It is basically divergent ahead of the disturbance around 300hPa． Further analysis of the meso-β-scale convective system indicates that it is also a convective vorticity cylinder with warm－cored．The collapsing of theintense convection is very rapid and much quicker than its genesis and development． The rain cluster is intensifying while the center of the vorticity cylinder is going down． on the meso-β-scale there appears a vibration on the scale of 2－3 hours，as indicates that there still exists asub-scale variation．
出处
《气象科学》
CSCD
北大核心
1999年第2期111-121,共11页
Journal of the Meteorological Sciences
基金
教育部博士点基金
