2021年7月24日海西大到暴雨过程成因分析  

Cause Analysis of Big Enough to Cause a Storm Process in Haixi on July 24, 2021

作　　者：余倩 裴尕桑 白延晖 唐仲涛 YU Qian(Haixi Observatory,Qinghai Province,Delingha,Qinghai 819100)

机构地区：[1]青海省海西州气象台,青海德令哈817099 [2]青海省气象防灾减灾重点实验室,青海西宁810001 [3]青海省平安区气象局,青海平安810600 [4]青海省海北州气象局,青海西海812200

出　　处：《农业灾害研究》2021年第10期34-37,共4页Journal of Agricultural Catastrophology

摘　　要：基于降水资料、高空、地面、Ncep1°×1°6 h再分析资料,分析2021年7月24日发生在青海省海西州的大到暴雨过程。结果表明:此次过程降水强度大、范围广,具有极端性和对流性质,降水时段集中,以短时强降水为主,并伴雷暴。弱冷空气、高空切变线、地面辐合线对此次强降水起到了很好的动力辐合抬升作用。水汽充足,T-Td≤2℃,700 hPa比湿在10 g/kg左右,东南风和冷空气前部的水汽源在辐合汇集明显。探空曲线呈现"瘦高"型短时强降水类型,低层暖平流,高层冷平流,层结不稳定,暖湿层深厚,降水效率高,强烈而深厚的上升运动,地形辐合和抬升对降水增幅明显。Based on precipitation data,upper air, ground and Ncep1°×1°6 h reanalysis data, the heavy to heavy rain process that occurred in Haixi, Qinghai province on July 24, 2021 was analyzed.The results showed that the precipitation intensity was large, the range was wide,extreme and convective, and the precipitation period was concentrated, mainly shorttime heavy precipitation, accompanied by thunderstorms. Weak cold air, upper shear line and ground convergence line played a good role on the dynamic convergence uplift of the heavy rainfall. Water vapor was sufficient, t-TD≤2℃, specific humidity of 700 hPa is about 10 g/kg, and water vapor sources in southeast wind and front of cold air converge obviously. The radiosonde curve showed a "thin and high" short-time heavy precipitation type, with warm advection at low level and cold advection at high level,unstable stratification, deep warm and wet layer, high precipitation efficiency, strong and deep upward movement, and terrain convergence and uplift had obvious effect on precipitation increase.

关 键 词：海西 大到暴雨 比湿 

分 类 号：P458.121.1[天文地球—大气科学及气象学]