暴雨中尺度系统不稳定理论的数值试验

针对已有的不稳定理论研究，提出把不稳定问题由求解特征值问题转化为求解初值问题，在考虑扰动气压和水汽作用的基础上建立一个二维线性化的非静力模式，以真实反映不稳定扰动特征。

NUMERICAL EXPERIMENT OF UNSTABLE THEORY FOR MESOSCALE SYSTEM WITH HEAVY RAIN

Based on studies of the previous instable theories,a method that unstability problem is solved by initial value problem but not calculating eigenvalue problem is presented Considering the perturbation pressure and moisture,we developed a two-dimension linear nonhydrostatic model which describes comprehensively the characters of the unstable disturbance The fact that the experimental results of symmetric instability and slantwise instability conform to previous theoretical results prove that the method is successful Results of numerical experiment show conditional gravitational instability led to the occurence of the heavy rain during 12:00UTC 5 00:00UTC 6 July,1991