高低空急流在闽西北“2002．6”大暴雨过程中的作用分析

Analysis of Action of High and Low Level Jet Stream in ＂2002.6＂ Torrential Rainstorm of Northwest Fujian

本文对2002年6月14日～18日闽西北的连续暴雨～大暴雨过程分析表明，在有利的环流背景条件下，高空急流的加强和动量下传，高低空急流的耦合对大暴雨的发生起了重要的作用，它是大暴雨发生的主要动力条件和触发机制。

After analysis of the continuous torrential rainstorm in Northwest Fujian during 14N18 on June 2002, it is pointed out that enhancing of high-level jet stream and spreading downward of momentum inpelled the establishing and maintain of low-level jet stream under the advantage of the circulation background. The enhancing of low-level jet stream provided the megathermal and high wet condition of atmosphere which is beneficial for causing heavy rain. The proper place of the high and low level jet stream produce the function of coincidence on dynamical field and provided continuous dynamical condition with which torrential rainstorm occurred and devdloped.