【摘要】 利用地面常规及广东自动观测站资料、NCEP/NCAR再分析资料、MICAPS提供的物理量场、北京T213和JMA中尺度模式分析场等资料,从高层环流特征、水汽条件、热力层结条件等方面对造成2005年6月5日、21日广州地区两次发布了"黑色"信号的大暴雨过程(广东暴雨预警最高级别)进行了天气动力学分析。着重从动力触发机制方面归纳总结了两次"黑色"暴雨过程的异同点,结果发现:①东路冷空气很可能是5日暴雨产生的触发因素;②西南季风急流的脉动和地面中尺度低压则是21日暴雨可能的触发条件。更多还原

【Abstract】 A dynamical analysis of two torrential rainfall events in June 2005 in Guangzhou is made with the routine meteorological data,automatic weather station data,NCEP reanalysis data and numerical model outputs.The similarities and differences between two torrential rains are found from aspects of environmental conditions and physical mechanisms.It is found that(1) the cold air from east is likely the trigger mechanism of the torrential rain on 5 June;(2) the pulse of the jet in the southwest monsoon flow and the surface mesoscale low pressure may be the trigger mechanisms of the torrential rain on 21 June.更多还原