2019年8月西藏阿里地区改则县一次历史罕见暴雨天气过程分析

文章利用micaps常规气象资料和卫星资料对2019年8月25日至8月26日西藏阿里地区改则县极端暴雨天气过程的大气环流场背景、各项大气物理量进行分析。结果表明:强降水发生过程期间西藏阿里地区处在西太平洋副热带高压边缘西侧,孟加拉湾和印度洋暖湿气流沿着副高边缘冲上西藏高原,北侧新疆地区有西风浅槽存在,引导北部冷空气南下。冷暖空气在阿里中部交汇,造成此次极端暴雨天气。

In this paper,the atmospheric circulation field background and various atmospheric physical quantities of the extreme rainstorm weather process in Gaoze County,Ali Prefecture,Tibet from August 25 to August 26,2019 are analyzed by using MICAPS(Meteorological Information Combine Analysis and Process System)conventional meteorological data and satellite data.The results show that during the occurrence of heavy precipitation,the Ali region of Tibet is located on the west side of the edge of the western Pacific subtropical high,and the warm and humid currents in the Bay of Bengal and the Indian Ocean rush up the Tibet Plateau along the edge of the subtropical high,which guides the northern cold air southward.The cold and warm air converged in the middle of Ali,causing the extreme torrential rain.