辽宁省东南部一次暴雨过程对流性分析

A Rainstorm Process Dynamic Diagnosis Analysis of Liaoning Province Southeast

采用FNL1°×1°一日4次资料、Micaps观测资料和区域自动站加密资料,对2015年8月2—4日辽宁东南部地区一次由东北冷涡引起的大范围持续性暴雨过程进行对流性诊断分析。结果表明,此次暴雨过程中东北地区上空有深厚低压系统,东侧阻塞高压和南侧副热带高压阻止其东移南压。850 h Pa上相对涡度正值区与暴雨区域有着良好的对应关系,且有利于对流云的产生和发展。闪电密集区和降水集中区对应良好,前一次中尺度对流系统的对流性更强。水汽充沛的山区更易出现闪电,尤其是丹东地区沿海地形为"喇叭口"的地区更是闪电的高发地区。红外卫星云图中的红色云团对流不稳定能量大,有利于强降水的产生,强雨带与对流云系位置基本一致。

Using FNL 1°×1°data and Micaps observational data and Regional automatic station encryption data, the reason and convection of a rainstorm event related to a cold vortex over southeast of Liaoning Province on August 2015 were investigated. The results showed that there was a deep and low pressure system over northeast region of China during the storm, on the east side of the south subtropical high blocking high pressure and prevent its eastward and southward. The 850 hPa relative vorticity positive area had a good corresponding relation with the area of the heavy rainfall. Lightning-intensive areas and heavy rainfall .concentrated regions correspond good. The convective system of the previous mesoscale convective system was stronger. Water vapor in the mountains was more prone to lightning. Satellite infrared cloud of red cloud convective instability energy was conducive to the strong precipitation. Strong rain and clouds position were basically the same.