抚顺市2次降雨过程V-3θ图特征对比分析

Characteristic Contrast Analysis on V-3θ Chart of two Rainfall Process in Fushun City

利用常规气象资料及V-3θ图对抚顺2013年"8.16"大暴雨天气过程和2015年5月11日大雨天气过程进行了对比分析,结果表明:2013年"8.16"大暴雨天气过程受副热带高压影响,以纬向环流为主,环境温度较高,具有高温高湿的特点。V-3θ图中200 h Pa的折拐处和3条线的抬头处,对流层顶出现超低温层,有强烈的不稳定能量存在;垂直风场由底层西南风转成高层西北风形成"顺滚流",这些都是大暴雨的先兆信息,降水过程中既有稳定性降水又有对流性降水。2015年5月11日天气过程受深厚冷涡系统影响,以南北经向环流为主,环境温度较低,热量和水汽不足。V-3θ图风场中为上下一致的西南风,没形成"顺滚流",以稳定性降水为主。

Using conventional meteorological data and V-3θ chart, May 11,2015 and 2013 ＂8.16＂ heavy rain weather process and torrential rain weather process in Fushun City were analyzed.The results showed that 2013 ＂8.16＂ torrential rain weather process influenced by the subtropical high, with zonal circulation was given priority to, the environment temperature was higher, had the characteristics of high temperature and high humidity.The V -3θ chart in 200hpa turn fold and three line up,tropopause temperature layer,there was strong unstable energy and vertical wind field formed by southwest into ＂clockwise＂ ,these were torrential rain warning information,there were both steady precipitation and precipitation process convective precipitation.On May 11,2015,the weather process influenced by deep cold eddy system, give priority to with the north-south meridional circulation, the environment temperature was low ,lack of heat and moisture.The V -3θ chart figure wind field were the same fluctuation of southwest, not ＂clockwise＂, gave priority to with steady precipitation.