甘肃省一次强对流天气过程特征分析

Analysis on Characteristics of A Strong Convection Weather Process in Gansu Province

利用实况观测资料和Micaps再分析资料对甘肃省一次强对流天气过程的天气特征、水汽条件、动力条件、不稳定条件等进行综合分析,并总结了强对流过程中雷达回波特征。结果表明:此次强对流过程持续时间较长、范围广,出现灾害性天气种类多、危害性强。在大气环流调整过程中,冷空气活动是造成强对流及冰雹灾害的主要动力,高空锋区及高空急流在北纬35°~40°之间,位于甘肃省上空,大气斜压性强。差动温度平流的存在及其强度,对不稳定层结的形成和加强起着至关重要的作用。能量锋区与冰雹及短时暴雨落区位置具有高度一致性。

By using real time observation data and Micaps reanalysis data,a strong convection weather process was analyzed from the aspects of circulation situation,water vapor condition,dynamic condition and unstable condition,and the characteristics of the radar echu of strong convection weather process were summarized.The results showed as follow ：The severe convective process lasted for a long time,the range was wide,there were many kinds of disastrous weather appeared in this weather process and it produced strong hm^fulness.In the process of circulation adjustment,cold air activity is the main driving force to cause strong convection and the hail ,the upper front zone and the upper level jet stream were between 35 °N to 40 °N, and they were located in Gansu province,while the atmospheric baroelinieity was strong.The existence and strength of the differential temperature adveetion played an important role in the formation and strength of unstable stratification.Energy frontal zone, hail and short time rainstorm position had highly consistency.