酒泉市一次暴雨过程的天气学诊断分析

Synoptic Diagnostic Analysis of a Heavy Rainfall Event in Jiuquan City

利用常规观测资料、卫星云图以及MICAPS业务平台常规资料,使用天气学诊断方法,剖析了2016年6月1日引发酒泉暴雨天气过程的降水特征环流背景及物理量特征。结果表明:这次暴雨高、低层均为"东高西低"的流场配置,高压脊的阻挡作用使上游低值系统在河西西部滞留时间较长,柴达木低涡发展缓慢,形成了类似于"北槽南"的流场形势。暴雨发生时高层辐散、中低层辐合,对流层内出现强烈的上升运动,这种流场的配置有利于水汽的输送和汇聚。此次暴雨过程中存在明显的中小尺度系统。

Based on the conventional high ground data,satellite cloud pictures and MICAPS routine data business platform,using the synoptic diagnosis method,the precipitation characteristics, circulation background and physical features of the heavy rain happened on June lth, 2016 in Jiuquan City were analyzed in this paper. The results showed that the upper layer and lower layer flow fields were east high west low.Due to the block of high pressure ridge,upstream minimum system stranded for a long time in the west of Hexi, gaidam low vortex developed slowly, forming a kind of flow field similar to north trough south vortex.When heavy rain occured ,the upper divergence ,low-level convergence and the strony upward movement in troposphere were good for water vapor transport and convergence.The medium and small scale system obviously existed during the heavy rain.