应用湿Q矢量诊断梅雨锋暴雨

利用湿Q矢量，结合改进的MM4（MMM4）模式模拟输的加密资料，细致地诊断分析了1991－07－05T20－06T20一次典型的江淮梅雨锋暴雨过程，结果表明：湿Q矢量散度辐合场随高度向倾斜；在梅雨锋暴雨发展，衰亡阶段，湿Q矢量散度散，合场在垂直方向上主要呈现出了相间分布的特点；从湿Q矢量散度辐合场这个角度探讨了梅雨锋暴雨的内在机理，并给出了梅雨锋暴雨具体预后的新思路。

Using the Wet Q-vector to Diagnose a Process of Meiyu Front Heavy Rain

Using the wet Q-vector and combining with the intense data output of the modified MM4(MMM4) model simulation,a typical Meiyu front heavy rain process occurred during 5-6th July 1991 in the Changjiang-Huaihe Basin is diagnosed carefully in this paper. The results are as follows:the convergence field of wet Q-vector divergence tilts northwards with height; the divergence/convergence fields of wet Q-vector divergence show an alternate distribution in the vertical direction at the developing and decaying stages of Meiyu front heavy rain; based on the convergence field of wet Q-vector divergence,the intrinsic mechanism of Meiyu front heavy rain is discussed, and a new thinking for the forecast of Meiyu front heavy rain is given.