用多普勒雷达资料对一次区域性暴雨的中尺度分析

利用多普勒雷达资料,对2006年6月2日夜间出现在陕西中部和北部地区的区域性暴雨过程进行分析。结果发现:低层暖湿急流和弱冷空气相互作用产生的两条中尺度辐合线是这一地区出现大暴雨的主要影响系统;低空东南急流为降水区提供的大量的水汽和不稳定能量堆积,在弱冷空气的触发下释放,是产生大暴雨的主要原因;低空急流的输送方向与中尺度辐合线的移动方向,决定了未来辐合线的发展状态;低空急流的日变化引起了暴雨夜发性。

Meso-Scale Analysis of a Regional Heavy Rain Using Doppler Radar Data

There was a regional heavy rain in the middle of Shannxi Province at the night of June 2,2006.The rain was analyzed by using Doppler data.The result shows that the meso-scale convergence line,which was the result of interaction between the low-level warm/wet jet and weak cold air,directly produced the heavy rain.Low-level jet provided not only ample of vapor but also instability-energy,so it was the main matter which resulted in so heavy rain.The directions of low-level jet and meso-scale convergence line that affects the developing of convergence line.At the night,low-level jet will become more intensive,that is why lots of heavy rain occurred in the evening.