大气可降水量在重庆夏季暴雨天气过程中的特征分析

摘要

Based on precipitable water vapor ( Pwv) data obtained from ground - based GPS network in Chongqing, the evolution characteristics of PWV during rainstorm weather processes occurred in early summer and midsummer were analyzed. Results show that the value of Pm was different in rainy day and no rain day, and in early summer, Pwv often increased rapidly in 20 -35 hours before rainstorm occurrence with the increasing rate of 0. 9 — 1.6 mm/h. while in midsummer, the value of Fwv increased relatively slow in 10 — 25 hours before rainstorm occurrence with the increasing rate of 0.4 - 1. 0 mm/h. Rainstorm often occurred when Pwv decreased from its peak to trough in both early summer and midsummer, but occurrence time of rainstorm was often different from each other.%利用重庆地区地基GPS观测网反演的大气可降水量(Pwv)数据,选取初夏和盛夏暴雨天气过程分析Pwv的变化特征.结果表明,降雨日和非降雨日的Pwv值有所不同；初夏暴雨发生前20 ～ 35h,Pwv值会出现持续快速增加,升幅在0.9～ 1.6 mm/h,而盛夏暴雨前的10 ～ 25 h,Pwv的增加相对缓慢,升幅在0.4～1.0 mm/h;初夏和盛夏的暴雨均出现在Pwv由峰值向波谷的变化过程中,但出现时间不同.