【摘要】 为了能够深入了解1011号台风"凡亚比"粤西暴雨过程发生发展机制,采用天气学诊断方法、Ncep1°×1°再分析资料和观测降水资料对凡亚比登陆后在广东西部地区造成的两次暴雨过程进行了研究。通过初步诊断分析得到以下结论:粤西暴雨二次增强的主要原因是强冷空气侵入和水汽输送增加,二次增强过程偏南风主导的水汽条件造成了暴雨增强。假相当位温的垂直剖面显示暴雨主要发生在等值线密集陡峭的区域,等值线的斜率增加对暴雨二次增强有指示作用。湿位涡在暴雨区为上正下负的垂直分布形式,对流层上层高值位涡向下传递,高层干冷空气与低层暖湿气流交汇促使降水增加。更多还原

【Abstract】 In order to learn more about the development mechanism of the rainstorm which is caused by No.1101 super typhoon "Fanapi",this paper uses weather diagnostic methods to study the two processes of heavy rain after "Fanapi" landed in the western part of Guangdong by applying Ncep 1°×1° reanalysis data and observed precipitation data.Through the preliminary analysis of this typhoon rainstorm,the result shows that the cold air and water vapor transmission are the mainly causes of the second strengthen precipitation.The isoline slope of pseudoequivalent potential temperature reflects the second strengthen precipitation,the upper troposphere high potential vorticity pass down and the cold dry air in the upper atomosphere confronts with the warm moist air in the lower atmosphere so that the precipitation increase.更多还原