苏尼特左旗春季一次大雨天气诊断分析

应用常规气象资料、卫星云图,对2009年4月23日苏尼特左旗对流性大雨天气的成因进行了诊断。分析了产生大雨的天气系统特征,大气垂直稳定度,产生大雨的水汽条件和动力触发机制。给出了产生大雨的对流云团演变特征。研究结果表明：对流性大雨是由高空冷涡、蒙古气旋共同影响产生的。低层强盛的偏南气流建立起水汽通道,把水汽源源不断地向大雨区输送。低涡槽结构和低层增温增湿气流侧向汇合,垂直涡度增大,辐合上升运动增强,对流不稳定能量释放,继而产生对流性大雨天气。

The Diagnosis Analysis on Heavy Rain of Spring in Sunite Left Banner

Using conventional observation data,satellite cloud pictures,the cause of convectional heavy rain weather of Suniter Left Banner on April 23,2009 was diagnosed in this article.The weather system characteristic,atmospheric vertical stability,the water vapor condition and power mechanism of forming heavy rain were analyzed.And the development characteristics of convectional cluster were gave.The results showed that the upper cold vortex and Mongolia cyclone formed the convectional heavy rain together.Lower powerful partial south current constructed moisture channel,and transported water vapor to heavy rain region continuously.Low vortex trough structure converged with lower humid and elevated temperature laterally,vertical vortex and convergence upper motion enhance,convection unstable energy release,then form convectional heavy rain weather.