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Distribution Characteristic of Severe Convective Thunderstorm Cloud over Qinghai-Xizang Plateau

ZHANG Hongfa1,GUO Sangang1,ZHANG Yijun1,CHENG Guodong1SHI Yunqiang2,PUBU Zhouma3,HOU Zhengjun2(1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences,Lanzhou 730000, China; 2. Rikaze Region Meteorology Bureau, Rikaze 857500, China; 3. Lhasa Meteorology Bureau, Xizang Autonomous Region, Lhasa 850000, China)  
Using the thunderstorm data over QinghaiXizang Plateau in summer ( May to September) from 1950 to 2000, especially the surface and upper weather data, radar echo data in field experiment observation over QinghaiXizang Plateau in recent 50 years, the change characteristics of convective thunderstorm distribution along QinghaiXizang Railway, diurnal variation and life cycle of severe thunderstorm over QinghaiXizang Plateau were analyzed. The results show that the severe thunderstorm weather in summer along QinghaiXizang Railway increased from north to south, the annual mean thunderstorm numbers reach 90, and thunderstorm in May~ September accounts for 97% in whole year. The occurring time of thunderstorm over QinghaiXizang Plateau is mainly at 15:00~22:00 (BLT) and decaying from north to south. The maintain of life cycle of severe convective thunderstorm activity over QinghaiXizang Plateau with ≤1 h makes up over 70% , that of 1~2 h 20%, and 2 h less than 10%.
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