安顺两次特大暴雨过程的TBB和螺旋度对比分析  

Twice rainstorm process analyzed comparatively with TBB and of helicity in Anshun City

作　　者：王兴菊[1,2] 罗喜平 吴哲红[1,2] 肖俊 

机构地区：[1]贵州省安顺市气象局,贵州安顺561000 [2]贵州省气象台,贵州贵阳550002

出　　处：《贵州气象》2013年第6期1-7,共7页Journal of Guizhou Meteorology

基　　金：国家自然基金项目(41065003)资助

摘　　要：利用自动站观测资料、探空资料及NCEP再分析资料,对2010年6月27日夜间和2012年7月12日夜间贵州南部局地大暴雨天气过程进行对比分析。结果表明,安顺的两次特大暴雨天气过程主要是受高空槽和中低层切变共同影响,并配合低空急流,形成了有利于强降水的环流背景。安顺处于假相当位温的高能舌区和K指数、螺旋度的大值区,为特大暴雨的形成提供了很好的能量和动力条件。MCC是造成安顺特大暴雨天气的直接原因,强降水发生在云团的冷核中心内,最强降水均出现在MCC的成熟期。关岭滑坡现场与周围环境明显的海拔高度差和温度差造成的热力差异,为关岭岗乌两次特大暴雨提供了动力源和暖湿气流,并造成了关岭岗乌多次的强降水。In this paper, the datas of automatic weather station , Upper - air sounding data, and NCEP reanalys- is data were used to compare and analyze two local heavy rainfalls occurred in southern Guizhou in the night of June 27, 2010 and in the night of July 12, 2012. The result showed that the two heave rainfall occurred mainly by the combined effect of the trough at upper level and the shear at middle and lower level, and the LLJ, all those made up the circulation background of heavy precipitation. Anshun was in the area where the high energy region of se, big value of K index and Helicity superimposed, which provided a good energy and power conditions. MCC was the di- rect cause of the heave rain, the heavy rain occurde in the coldest center in the cloud, the most heavy rain all oc- curred at the mature period of MCC. The difference in altitude and temperature caused the thermal differences in the scene of the landslide in Guanling County, provided the power source and warm and humid air for two heave rain in Gangwu Town, Guanling County, created a number of heavy precipitation process in Gangwu Town.

关 键 词：特大暴雨 高空槽 低空急流 K指数 螺旋度 MCC TBB 

分 类 号：P458[天文地球—大气科学及气象学]