摘要
利用NCEP每日4次的1°×1°再分析资料、地面降水资料、FY-2E卫星云顶相当黑体温度资料，针对贵州2011年6月5-6日和9月30日至10月1日的2次暴雨天气过程的形成机制进行了诊断分析。结果表明：中纬度低压槽和热带低压分别为2次暴雨提供了有利的环流条件，偏南暖湿急流与干冷气流的交汇有利于激发中尺度对流系统，2次暴雨过程都伴有旺盛的中尺度对流系统发展，MCS是造成暴雨的重要原因。对流层高层强辐散、低层辐合的配合，垂直运动的增强和充足的水汽供应形成了有利于强对流活动发生发展的条件；湿位涡的水平分布对暴雨落区及发展有较好的指示意义，湿正压项和湿斜压项的恰当配合对于垂直涡度的增长和对流活动的加强有重要作用。
The formation mechanism of two heavy rainstorm weather processes in Guizhou on June 5 to 6 and September 30 to October 1, 2011 were analyzed by using precipitation, blackbody temperature of FY -2E satellite at the cloud top and 6 hours reanalysis data with 1°×1° spatial resolution from NCEP FNL. The results show that low - pressure trough in middle latitudes and tropical depression provided the favorable conditions for two heavy rainstorm processes respectively, meanwhile the intersection of southern warm - humid jet and cold - dry air was beneficial to motivating the mesoscale convective system. Two heavy rain processes were accompanied with the development of strong mesoscale convective systems （ MCS）, so MCS was an important reason for the formation of the heavy rain. The strong divergence of the upper - level troposphere coordinated with low - level convergence, the enhanced vertical movement and a- bundant supplement of water vapor in the atmosphere were conducive to the occurrence and development of severe convection. In addi- tion, the horizontal distribution of moist potential vorticity （MPV） had considerable forecasting significance for the area and develop- ment of heavy rain. The appropriate cooperation between MPV1 and MPV2 played an important role for the increase of vertical vorticity and the enhancement of convection.
出处
《干旱气象》
2013年第3期535-541,共7页
Journal of Arid Meteorology
基金
公益性行业(气象)科研专项(GYHY201306059)资助
关键词
暴雨
中尺度系统
物理量场
湿位涡
rainstoim
mesoscale systems
physical quantity field
moist potential vorticity
