鲁南一次锋面附近局地特大暴雨成因分析

利用美国新一代中尺度数值模式WRF对2005年9月2日发生在鲁南的一次局地特大暴雨过程进行了数值模拟,着重对此次暴雨的产生机制进行了分析.研究表明,台风倒槽顶部的高湿区是暴雨主要水汽来源;对流层低层辐合线在暴雨发生发展过程中起重要作用;锋面附近的小尺度扰动是造成暴雨的直接系统;对流层低层地形造成的绕流是暴雨重要的触发机制;南北两系统的相互对峙是造成特大暴雨的重要原因.

Causal Analysis of a Severe Local Heavy Rainfall near a Cold Front in Southern Shandong Province

A severe local heavy rain occurred in the southern Shandong Province on 2 September 2004 was simulated by use of the next generation meso scale non hydrostatic model WRF. The causes of the heavy rain are analyzed with the reasonable simulation results. The results show that the high humidity area in the inverted trough of a typhoon is vapor sources. The mesoscale convergence line in the lower stratosphere played a very important role. The small scale vortex near the front is the direct cause of the heavy rain. Terrain is a trigger mechanism and the interaction between typhoon inverted trough and front enhanced the precipitation.