摘要
次天气尺度系统是一类水平尺度为几百公里的天气系统,它的发展常带来暴雨这样的强降水天气,西南低涡、江淮气旋就是这类系统的典型个例。天气分析事实表明,次天气尺度系统的发展和移动受到大尺度环境场的制约,因此,详细地研究大尺度环境场对次天气尺度系统发展和移动的影响是必要的。本文依据滤波原理,把大气运动场分解为大尺度环境场和次天气尺度扰动场,采用动力分析方法。
In this paper, equations that describe the effect of environment flow fields on development of subsynoptic scale vortex are applied to two layers models. According to some characteristics of the subsynoptic scale systems, geostrophic approximation is applied to subsynoptic scale turbulence vorticity in high-layerof two layer model. Physical parameter indicatingdevelopment of low-layer subsynoptic scale systems and its equilibrium oquation are obtained by solving equations. Using this equilibriium equation, effects of environment flow fields on development and movement of subsynoptic scale systems are discussed.
出处
《气象学报》
CSCD
北大核心
1991年第4期574-580,共7页
Acta Meteorologica Sinica
