2012年7月8日-9日临汾市局部暴雨天气特征分析  

Analysis on the Characters of the Local Rainstorm Weather Occurred in July 8 - 9, 2013 in Linfen City

作　　者：吴海婷 王瑞 荆、悦 李韵文 张素琴 杨拥军 

机构地区：[1]临汾市气象局,山西临汾041000 [2]侯马市气象局,山西侯马043000

出　　处：《山西气象》2013年第4期6-9,共4页Shanxi Meteorological Quarterly

摘　　要：本文从分析天气形势、物理量场特征、自动站逐时资料变化特征等人手，对2012年7月8日一9日临汾市局部暴雨天气过程进行了分析。结果表明：（1）此次降水过程是在西风槽东移，副高西进北抬有利的环流背景下产生的。700hPa中尺度低压和低层辐合线以及东路冷空气是本过程的主要触发系统。（2）降水过程中边界层出现了明显的中尺度辐合线和切变线以及低涡环流，短时强降水与小尺度的低涡环流相对应。（3）物理量场上，降雨前期暴雨区有强的上升运动、较高的能量积累和层结不稳定，但低层辐合很弱，中低层湿度只在某层次上达到饱和。The local rainstorm weather happened in July 8 - 9 , 2013 in Linfen has been analyzed from the synoptic situation, the characters of the physical quantity field and the hourly variation of the automatic station data. The results showed that： （1） the rainstorm occurred in a large-scale circulation background, when the westerly trough went to east and the subtropical high stretched westward and carried northward. The mesoscale vortex on 700hPa, low-level convergence line and the cold air from the east were the main trigger systems. （2） While raining, there appeared obvious mesoscale convergence line, shear line and circulation of vortex in the boundary layer. The short time strong rainfall corresponded to the small scale vortex. （3） From the physical quantity fields, at the beginning of the rainfall, there had strong ascending motion, high energy accumulation and unstable stratification on the rainstorm area, but the low level convergence was weak and the low level moisture had reached saturation only at a certain level.

关 键 词：暴雨 中尺度低压 低层辐合线 

分 类 号：P458.121.1[天文地球—大气科学及气象学]