论文部分内容阅读
采用非静力中尺度模式WRF,对2010年4月中旬鄂北襄樊出现的一次罕见春季降雪过程的天气系统和降雪云微物理量的三维分布特征进行了模拟分析。结果表明,该模式较好地模拟了降雪中心和主要的固体降水形态。进一步分析表明,西北干冷空气南下造成了环境降温和长江中游槽线切变区激发对流的发展,在对流层中层直接形成固态降水物质,低层高湿和充足的水汽输送是这次降雪过程形成的重要因素。“,”Using the nonhydrostatic WRF model,the mesoscale snowfall system and 3D distribution of microphysics of unusual snowfall with thunderstorm and hailstone happened in Xiangfan,Hubei Province during 13-14 April 2010 are simulated and analyzed.The results show that the WRF model successfully simulated the snowfall distributions with two centers at Xiangfan and Yichang,respectively.The northwest dry cold move southward which cause environmental temperature decreasing and convection development within the shear-zone in the middle reaches of Yellow and Yangtze Rivers,the high humidity and sufficient vapor transport in lower level are important for the snowfall formation.