摘要
利用常规资料分析了2010年6月17和20日暴雨天气过程的成因。结果表明,2次过程的雨量中心都在铁路沿线,6月20日暴雨强度比17日大。6月17日过程雨带是由南向北抬,影响成因为850 hPa西南气流加强、风速的辐合造成,没有冷平流配合;20日过程雨带由北向南移动,是由850 hPa切变线、地面冷锋造成,有明显的冷平流入侵。2次过程都受西南季风影响,过程发生前23 d孟加拉湾的对流云团发展。T639的850 hPa水汽通量能较好反映低层的水汽辐合,雨量中心与水汽通量散度中心是对应的。
Based on conventional data,the causes of heavy rain occurred on June 17th and June 20^th in 2010 were analyzed.The results showed that the precipitation centers of these two heavy courses were on the railway line.The strength of heavy rain on June 17th was more large than that of June 20^th.The rain belt on June 17th was moving north from south.The cause was south wind velocity convergence on 850 hPa,not cold flow.The rain belt on June 20^th was moving south from north.The cause was 850 hPa shear and cold front,obvious cold flow entering.The two courses were affected by monsoon.Ahead of 2-3 days of heavy rain there were convective clouds developing over Bay of Bengal.The water vapor flux of T639 can reflect low level vapor convergence,the center of the precipitation and the canter of vapor flux were corresponding.
出处
《安徽农业科学》
CAS
北大核心
2010年第33期18884-18885,共2页
Journal of Anhui Agricultural Sciences
基金
广西科技厅项目(桂科自0728076)
关键词
暴雨
切变
孟加拉湾对流
T639
Heavy rain
Shear
Convection in Bay of Bengal
T639
