华南一次暴雨过程的中尺度结构

利用合成分析方法检验了一次华南暴雨的三维气象要素场的分布。发现一个具有微冷锋特徵的辐合线是造成这次暴雨的主要中系统。在低层,暴雨区的后部存在着弱下沉气流,并导致了一个相应的低层冷区和地面弱流出辐散气流。中、高层是一中尺度暖区。暴雨区介于天气尺度高、低空急流之间,并且有向着最大上升区移动的趋势。 

ON THE MESOSCALE STRUCTURE OF A HEAVY RAIN OCCURRING IN SOUTH CHINA

The distribution of three dimensions meteorological element fields of a heavy rain that occurring in the Southern China region was examined using a composite method. A mesoscale convergence line with some features of mini-cold front was a main system which caused the heavy rain. There was a weak downdraft at the rear of the heavy rain region at low level. It resulted in the divergent outflow at ground and a mesoscale cold region at low level. But at mid-and-high level,there was a warm region. The heavy rain region was between a large-scale low-level jei and high-level jet and showed the teudency of moving toward the maximum updraft region.