青海省环湖地区一次大雨天气触发条件分析

Analysis of Triggering Conditions of a Heavy Rain in the Area around the Lake in Qinghai

摘要: 针对2013年8月20日青海省环湖地区刚察县站出现的一次对流性局地大雨天气过程，分析了高空环流形势、探空资料、地面单站资料、物理量场、卫星云图达五个方面的资料，得出此次大雨天气的触发环境是沿着西太平洋副热带高压(588线)外围的西南暖湿气流与北部短波槽携带的冷空气交汇带；单站水汽压的持续上升或维持，对大降水是否会触发有一定的指示意义；另外，湖陆风与特殊的地形对局地大降水的触发起了重要的作用。

Abstract: In view of a convective local heavy rain weather process that occurred at Gangcha county station in the region around Qinghai Lake on August 20, 2013, the upper air circulation situation, sounding data, single ground station data, physical quantity field and satellite cloud picture are analyzed, it is concluded that the trigger environment of this heavy rain is the convergence zone of the southwest warm moist air flow along the periphery of the 588 line of the Horse latitudes and the cold air carried by the northern short wave trough; in addition, the lake-land breeze and the special topography play an important role in triggering the local heavy precipitation.