摘要
利用常规资料、自动站降水资料及NCEP/NCAR再分析资料(水平分辨率为1°×1°)等对2015年6月7—8日发生在黔东南州一次强降水过程进行诊断分析,结果表明:此次强降水的环流背景为副高西伸北抬,内蒙冷涡发展强盛,高原低值系统活跃,不断引导冷空气南下;700 h Pa与850 h Pa上西南急流加强并维持,低层风速风向辐合,为暴雨提供了水汽和动力条件;在降水发生前期,CAPE较大,不稳定能量明显积蓄,降水产生及雨势减弱停止时,CAPE迅速释放,强降水落区位于地面辐合线与850 h Pa切变线之间;雷达资料显示对流回波长时间维持并发展,"列车效应"显著。
By using conventional meteorological data, NCEP/NCAR global 1 ° × 1 °final _ analysis data and Au- tomatic station precipitation data, one regional heavy rainfall over Qiandongnan Miao and Dong Autonomous Prefec- ture from 7 June to 8 June in 2015 was generally rainfall occurred in the background of subtropical diagnosed and analyzed. The results show： this regional heavy high moving to the west and north, cold eddy in Mongolia devel- oped strongly, plateau low systems is active that guide the cold air moving to south. The southwest jet stream on 700 hPa level and 850hPa has strengthened and maintained, wind speed and direction convergence happened on low level, providing with vapour and dynamic conditions. The CAPE remained large value before precipitation, un- stable energy charged obviously. The CAPE decreased rapidly when the rainfall was weakened. The main precipita- tion area lies between the ground convergence line and the shear line on 850 hPa level. Radar data displays convec- tion maintains and develops during the precipitation, the train effect is obvious in this nrocess.
出处
《贵州气象》
2016年第4期34-39,共6页
Journal of Guizhou Meteorology
基金
资助项目:"铜仁冷式和暖式切变型暴雨环流特征及落区分析"(黔气科合QN[2016]09)
关键词
低空急流
地面辐合线
CAPE
列车效应
low level jet
the ground convergence line
CAPE
the train effect
