两次不同类型暖区暴雨的对比分析

2014年5月8-12日,华南发生了连续暴雨天气过程,为了探究回流暖区暴雨和锋前暖区暴雨的成因,加深这两类不同类型暴雨的认识,利用NCEP/,NCAR的1°×1°再分析资料、多普勒天气雷达、风廓线仪、自动站资料等,分析了回流暴雨与锋前暖区暴雨的特征及主要物理差异。得出：（1）8日暴雨发生在变性高压脊后部,未受冷空气影响,属于回流型暖区暴雨过程,10-11日暴雨发生在锋面低槽中,属于锋前型暖区暴雨。（2）两种类型暴雨不仅降水的分布、中尺度云团活动、雷达特征等存在明显的差异,而且在天气形势、水汽输送、动力机制、中尺度环境条件以及与暴雨的触发机制存在着不同点,这些差异可能是造成两类暖区暴雨降水落区及量级差异的主要原因。

Contrastive analysis of two different type rainstorms in warm area

Based on the NCEP/NCAR 1° x 1° reanalysis data,Doppler weather radar,the wind profile meter and automatic station data,etc.,the characteristics and main physical differences of the backflow and prefrontal rainstorm,which appeared on May 8-12,2014 in south of China,in warm area were analyzed to explore the cause of formation and deep the understanding.It is concluded that：（1） storm occurred in the back of modified ridge on 8th,which was not affected by the cold air and belonged to the backflow rainstorm process,rainstorm on 10-11 occurred in the frontal low trough,and belongs to the prefrontal warmer area type.（2） there are significant differences not only in the distribution of precipitation,mesoscale cloud activities and radar characteristics,but also in the weather situation,water vapor transmission,dynamic mechanism,mesoscale environment condition and the triggering mechanism of heavy rains,these may be the main cause of differences between drop zone area and magnitude of these two kinds of heavy rain.