两次不同降水性质的天气过程对比分析

Comparative Analysis of Two Weather Processes with Different Precipitation Properties

该文利用常气象规观测资料,对2013年6月25日~7月2日月连续发生在四平地区的两次暴雨天气过程进行了对比分析,结果表明:两个过程降水性质不同,过程一以对流性降水为主,过程二以稳定性降水为主;过程一为暖区切变降水,形成了整层的不稳定层结,过程二为江淮气旋北上,不稳定能量较小;两个过程的水汽输送都以渤海为主,两次暴雨过程比湿都超过了10 g/kg;两次过程的动力机制不同,过程一为低层动力触发不稳定能量释放,形成的垂直上升运动,过程二是以高空强辅散为主,形成的垂直上升运动;各家数值预报对对流性降水偏差较大,对大范围稳定性降水预报的量级以及稳定性上都表现较好。

Based on the observation data of normal weather gauge,this paper makes a comparative analysis of two consecutive rainstorm weather processes in Siping area from June 25 to July 2 of the year 2013.The results show:The precipitation properties of the two processes are different.The first process is mainly convective precipitation,and the second process is mainly stable precipitation;the first process is shear precipitation in the warm region,forming a whole layer of unstable stratification,the second process is that the Jianghuai cyclone moves northward with less unstable energy;the water vapor transport of the two processes is mainly in the Bohai Sea,and the specific humidity of the two rainstorms exceeds 10g/kg;the dynamic mechanisms of the two processes are different.The first process is the vertical upward movement formed by the unstable energy release triggered by the low-level power,and the second process is the vertical upward movement formed mainly by the high-altitude strong auxiliary dispersion;each numerical forecast has a large deviation from convective precipitation,and performs well in the magnitude and stability of large-scale stable precipitation forecast.