东北夏季副高后部MCC暴雨的诊断分析

本文对1989年7月22日出现在副高后部的一次MCC过程进行了动力诊断研究。结果表明:温度平流，积云对流加热和大尺度凝结加热是系统发生发展的主要物理因子。在MCC出现之前和形成初期，Q矢量的散度、旋度和用Q矢量表示的准地转锋生倾向以及不稳定区内水汽辐合量的大幅度增长均能提供大量可供预报员使用的信息。

A Diagnostic Study of a MCC with Severe Rain over Northeast China in Summer

A real-time quasi-geostrophic omega diagnostic scheme, based on Hoskins′-vector analysis, is applied to a MCC (mesoscale convective complexes) with severe convection over northeast China in summer. And the vertical motion of the system is computed by use of the ten-level meso- scale nonlinear model. The principle results are as follows: thermal advection is an initial triggering condition for the genesis of this MCC. The cumulus heating and large –scale latent heat release are, generally, very crucial physical factors for the intensification and development of the system. The divergence and the rotational component of the -vector and the geostrophic frontogenetical function expressed by -vector would provide forecasters with a lot of useful information.