摘要
利用常规资料、自动站降水资料和卫星云图资料分析了2014云南省丽江市首场区域性暴雨过程。结果表明此次过程是高空槽东移引导弱冷空气南下,同时受500 h Pa两高辐合区和700 h Pa切变线共同影响所致;孟加拉湾水汽为此次暴雨过程的主要水汽来源,同时强水汽辐合中心的存在和移动过程经过丽江是此次区域性暴雨形成的主要特征;强降水时段低层辐合高层辐散且有强烈的斜压上升运动;中尺度对流云团的合并及加强,TBB值小于220 K是此次强降水的一个特征。
The first regional heavy rain occurred in Lijiang in 2014 was analyzed by using the data of conventional observations,automatic weather stations and satellite pictures. The results showthat heavy rainfall process is when upper trough moved east the weak cold air moved to Lijiang. At the same time,500 h Pa convergence between two hights and 700 h Pa shear line acting together. It is found that the vapor in the heavy rain was mainly from Bay of Bengal,strong water vapor convergence center and its moved to Lijiang was one of major characters in this rainfall process. Lowlevel convergence,high level divergence and baroclinic upward movement occurred in strong rainfall period. The other character was two mesoscale cloud cluster merged into one and its TBB less than 220 K.
出处
《云南地理环境研究》
2014年第6期66-71,共6页
Yunnan Geographic Environment Research
基金
云南省气象局预报员专项项目(YB201406)资助
关键词
暴雨
两高辐合
水汽辐合
MCS
heavy rain
convergence zone between two hights
water vapor convergence
MCS
