贵州一次大暴雨物理量场诊断分析

A diagnostic analysis of the physical mass field of a heavy rain in Guizhou

根据FY-2C卫星逐时红外云图、云顶亮温(TBB)资料(分辨率0.05°×0.05°)、探空资料、NCEP/NCAR(分辨率1°×1°)。对发生于2012年5月21日夜间到22日凌晨的贵州西南部大暴雨天气过程进行物理量诊断分析:(1)此次大暴雨天气过程是发生在大尺度环流背景下,贝加尔湖低槽后部偏北气流引导冷空气南下与槽前的西南暖湿气流在贵州上空交汇的结果;(2)西南急流带来的孟加拉湾水汽和东南气流带来的南海水汽在暴雨区汇聚,为强降雨发生提供充足的水汽条件;(3)此次强降水主要由MCS发展演变过程产生。

Based on precipitation facts,sounding data,NCEP/NCAR(resolution 1℃×1℃).Combined with the characteristics of each physical mass field to carry out physical diagnosis of the heavy rain weather process that occurred in southwestern Guizhou from the night of May 21 to the early morning of May 22,2012:(1) The heavy rain weather process occurred in the background of large-scale circulation,the northerly air flow at the rear of the low trough of Lake Baikal to guide the cold air The result of the south-west warm and humid air flow in the southandum and the trough meets over Guizhou,(2) the South China Sea moisture from the Southwest rapids and the south-east eras converge in the heavy rain area,providing adequate water vapor conditions for heavy rainfall,and(3) the heavy precipitation is mainly generated by the evolution process of MCS.