利用GPS水汽资料对重庆一次暴雨过程的综合分析

Comprehensive Analysis of a Heavy Rain using Water Vapor of GPS

为了更好地预报重庆地区暴雨发生的时间和落区,利用重庆地区基于GPS得到的GPS-PWV(Precipitable Water Vapor)资料结合WRF数值模拟对2012年一次暴雨过程进行综合分析,分析此次过程中重庆地区GPS-PWV的变化特征、不稳定能量以及动力抬升条件与降水的关系。研究结果表明:此次过程在降水之前有18小时到35小时的水汽聚集过程,在接近水汽通道的迎风坡面降水量转化率较高。综合分析不稳定能量和水汽通量散度的变化结合GPS-PWV提供的水汽场能够更好地预报降水发生的时间和落区。

In order to forecast the time and area of Chongqing torrential rain better, make a comprehensive analysis on a torrential rain in 2012 based on GPS PWV （Precipitable water vapor） obtained from Chongqing terrain foundation combined with numerical simulation WRF. Analyze the relationship between the precipitation and the GPS-PWV change characteristics of instable energy, dynamic lift condition. Research results suggest an 18 hours to 35 hours vapor accumulation process before the precipitation together with a higher rainfall conversion rate at windward slope close to the vapor channel. The results show that instable energy change, vapor flux divergence and vapor field provided by GPS-PWV can effectively forecast the time and area of precipitation.