摘要
从天气背景的分析出发,利用多普勒天气雷达的强度、速度资料以及由速度资料反演的垂直风廓线和二维风场对一次北京局地暴雨从开始到强降水结束时段做了详细的分析。分析发现,这次局地强对流暴雨是大尺度系统和中尺度系统共同作用的结果,大尺度环流为暴雨提供了充沛的水汽;本站层结有很大的不稳定度,为强对流风暴的产生提供了必要条件;低层中尺度辐合线起到了触发对流和加强对流的作用。
Through analyzing the weather situation, a local torrential rain event is analyzed in detail based on the intensity and velocity data from Doppler weather radar as well as vertical wind profilers and two dimensional wind fields derived from velocity data. It is found out that this highly convective local torrential rainfall was caused by both large-scale and mesoscale weather systems. The large-scale circulation provided abundant vapors for the torrential rain; the stratification in Bejing was very unstable, which is a necessary condition for the severe storms; and the low-level mesoscale convergence line triggered and intensified the convection.
出处
《气象科技》
2006年第3期286-290,i0001,共6页
Meteorological Science and Technology
基金
"十五"国家科技攻关计划课题"奥运气象保障技术研究"(2002BA904B05)
2002年北京市重大科技计划项目"奥运会气象保障科学技术试验与研究"(H020620190091)
"十五"国家科技攻关计划课题奥运科技专项"北京奥运会国际天气预报示范计划关键技术研究"(2003BA904B08)共同资助
关键词
局地暴雨
中气旋
垂直风廓线
VAP风场
local torrential rain, mesoscale cyclone, vertical wind profiler, VAP wind field
