内蒙古额济纳旗一次局地大到暴雨的成因分析  

Cause of a Local Heavy-hard Rain in Ejina Banner,Inner Mongolia

作　　者：李春筱[1,2] 董治宝[1] 徐永旺[2] 常佩静 

机构地区：[1]中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室,甘肃兰州730000 [2]内蒙古阿拉善盟气象局,内蒙古巴彦浩特750300

出　　处：《中国沙漠》2011年第3期774-779,共6页Journal of Desert Research

基　　金：国家自然科学基金项目(40871003)资助

摘　　要：通过对2008年10月3日发生于内蒙古额济纳旗达来呼布镇一次局地大到暴雨的天气过程分析,结果发现:①短波槽东移在额济纳旗加深、加强,东高西低形势的建立,是强降水发生的背景条件。②高空冷槽、上升运动、低涡辐合区汇合并叠加为该地中小尺度系统生成和发展提供有利条件。③大到暴雨产生在深厚的水汽层结、水汽辐合及强烈的持续上升运动区在高层辐散、低层辐合的形成区,对流发展,强烈的低涡辐合触发不稳定能量释放,产生了大到暴雨天气。④700 hPa暖舌北伸与高空冷槽相叠置,形成大片雷暴区。An analysis of weather process of a local heavy-hard rain which happened on October 3, 2008 in Ejina Banner, Inner Mongolia was conducted in the paper. Firstly, the eastward movement of short wave trough and then combined with south branch trough was the necessary condition of the heavy-hard rain. Secondly, the combination and superposition of high cold trough, upward motion and vortex convergence area were the advantages for formation and development of medium scale and small scale systems. Thirdly, heavy-hard rain always happens in the environment with deep aqueous vapor layer, moisture convergence and strong-sustained ascending motion. In the forming region of upper-level divergence and low level convergence, convection developed, and the strong vortex convergence triggered the discharge of unstable energy, therefore, induced the happening of heavy-hard rain. Finally, the overlay of 700 hPa warm tongue and high cold trough induced the formation of wide thunderstorm belt.

关 键 词：阿拉善高原 额济纳旗 达来呼布镇 大到暴雨 成因 

分 类 号：P458.121[天文地球—大气科学及气象学]