Satellite Image Characteristics and Formation Mechanisms of Newborn Thunderstorms in Eastern Qinghai-Xizang Plateau

Zhang Qi;Ren Jingxuan;Xiao Dixiang;Long Keji;Xiao Hongru;Meteorological Observatory in Sichuan Province;Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province;Unit 78127 of PLA;  

Based on the FY-2 D/E satellite and thunderstorm data in summer from 2010 to 2014,the satellite image characteristics of newborn thunderstorms and their formation mechanisms in the Eastern Qinghai-Xizang Plateau are analyzed. The results show that the satellite image characteristics of thunderstorms have obvious features,and the cloud top,which has a high correlation with altitude,is below the tropopause.In general,the TBB of the IR channel(IR1)often ranges from-55℃to-10℃,and the TBB of the vapor channel(IR3)has a high frequency from-50℃to-30℃.The TBB difference between IR2(TBB of the split-window channel)and IR1 has a high frequency around-3.3 ℃,and the TBB difference between IR3 and IR1,which is greater than 0 ℃,reaches 83%.In addition,the differences between the surface and air temperature often appear from 5 ℃ to 15 ℃,while the surface temperature is basically from 25 ℃ to 30 ℃ and the relative humidity between 40% to 55% and 30% to50%in regionsⅠand Ⅱ.But the differences between the surface and air temperature often range from 5℃to 10 ℃,and the surface temperature is concentrated mainly from 30 ℃to 35 ℃in theⅢregion.The differences between the surface and air temperature,surface temperature,and relative humidity conditions are reasonable and can be good indicators of newborn thunderstorms in the eastern Qinghai-Xizang Plateau.

【Fund】： 四川强对流预报创新团队 发展灾害性天气预报关键技术——提升暖区暴雨和局地突发性暴雨预报能力(YBGJXM(2017)1A);; 中国气象局预报员专项(CMAYBY2018-064);; 四川盆地及攀西地区暖区暴雨个例库建设(省重实验室2018-重点-01)资助
【CateGory Index】： P457.9

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