内蒙古一次区域性暴雨的湿位涡诊断分析

应用自动气象站观测资料及NCEP再分析资料,对2012年7月27日发生在内蒙古中西部地区一次暴雨天气过程的湿位涡场进行了诊断分析。结果表明:MPV1"正负值区垂直叠加"的配置对暴雨的发生、发展非常有利,且MPV1负值中心区对暴雨落区有一定的指示作用;MPV2的分布表明,随着大气斜压性增强,强降水总是发生在对流层低层斜压性较强的区域;低层斜压项的负值区与暴雨的落区存在着良好的对应关系。

Diagnosis Analysis on the Moist Potential Vorticity of a Regional Heavy Rain in Inner Mongolia

Based on the observation data of automatic weather station and NCEP reanalysis data, the article ana- lyzed the moist potential vorticity （MPV）of a heavy rain occurred in midwest Inner Mongolia on July 27th 2012. The results showed that the MPV 1 configuration of vertical overlapping of the positive and negative areas was fa- vorable to the generation and development of heavy rain, and the negative MPV1 areas center had indicative in- tention to heavy rain center. The distribution of MPV2 showed that heavy rain always occured in strong baroclin- icity region of lower troposphere with atmospheric baroclinicity strengthen. The negative baroclincity areas of lower troposphere matched with heavy rain center very well.