高低空急流在闽西北大暴雨过程中的作用及数值模拟

本文对2002年6月14~18日福建西北部地区的连续暴雨~大暴雨过程的诊断及模拟分析表明,在有利的环流背景条件下,高空急流的加强和动量下传,促使低空急流的建立和维持;低空急流的加强则提供了有利暴雨产生的高温高湿的大气条件;高低空急流的适宜配置,产生了动力场的耦合作用,为大暴雨的发生、发展提供了动力条件。

NUMREICAL STUDY AND ACTION OF HIGH AND LOW LEVEL JET STREAM IN"2002.6"TORRENTIAL RAINSTORM OF NORTHWEST FUJIAN

Based on numreical study and analysis of the continuous torrential rainstorm in Northwest Fujian during 14- 18 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 produced the function of coincidence on dynamical field and provided continuous dynamical condition with which torrential rainstorm occurred and developed.