内蒙古通辽地区2012年7月20-13日暴雨过程分析

利用高空、地面实时资料及卫星云图，对内蒙古通辽地区2012年7月20—23日暴雨天气过程进行了较详细的分析，并对产生暴雨的基本物理条件加以讨论。结果表明，高空受低涡控制、地面受气旋影响，是该次暴雨天气的环流背景；低层正涡度值较大，有利于对流天气的发生、发展，是造成通辽市暴雨的重要触发机制；高层辐散、低层辐合这种配置的抽吸作用，使上升运动得到发展加强，对暴雨的形成极为有利；暴雨与850hPa或700hPa的比湿值有密切关系；高、低空急流的位置及其耦合作用对暴雨的形成非常重要。

Analysis on Rainstorm Process in Tongliao of Inner Mongolia from 20^th to 23^rd in July, 2012

Based on high altitude and ground real-time data and satellite image, the rainstorm process in Tongliao of Inner Mongolia from 20^th to 23^rd in July, 2012 was analyzed, furthermore basic physical conditions for rainstorm generation were discussed. Results showed that： high altitude was controlled by low vortex and ground was affected by cyclone, which were circulation background of the rainstorm; higher low-rise positive vorticity was benefit for the generation and development of convective weather, and was the important trigger mechanism of rainstorm in Tongliao; the pumping action of upper-level divergence and low level convergence strengthened ascending motion, and was benefit for formation of the rainstorm; the rainstorm had close relationship with specific humidity of 850 hPa and 700 hPa; the position of high-level jet and low-level jet as well as their couolin~ effect were very imoortant for the formation of rainstorm.