2010年7月31日抚顺特强暴雨成因及落区分析

为了揭示出抚顺特强暴雨产生的物理机制，利用MICAPS中的常规观测资料、沈阳多普勒雷达资料和FY-2E红外云图资料，对2010年7月31日抚顺特强暴雨的成因及落区进行分析。结果表明：2010年7月31日抚顺特强暴雨产生的主要影响天气系统是西太平洋副热带高压、冷涡和蒙古气旋，584dagpm等高线经抚顺南落是抚顺汛期暴雨预报的重要指标；低层温度脊和中高层温度槽构成了大气的不稳定层结，天气系统辐合上升和抚顺山地的抬升作用触发了抚顺的强降雨；高空急流和低空急流出口区的位置及适当耦合是这次特强暴雨落区抚顺的重要原因；低层暖湿舌左前方和水汽通量散度最大梯度带是这次特强暴雨的落区点，散度场上低层辐合与高层辐散的垂直配置是这次特强暴雨产生的动力原因；卫星云图和多普勒雷达资料在这次特强暴雨短时预报预警中发挥了重要作用。

The Study of Causes and Drop Zones of Heavy Rainfall in Fushun on 31 July, 2010

In order to reveal the mechanism of the Fushun strong storm, using the conventional data, Shenyang Doppler radar data and FY-2E infrared satellite data, the author studied the causes and drop zones of Fushun strong storm on 31 July 2010. The results showed that: the main impact weather systems of the strong storm in Fushun on 31 July 2010, was the western pacific subtropical high, cold vortex and Mongolia cyclone. The 584 dagpm contours southwards through Fushun was an important indicator for Fushun rainstorm forecasting; low-level temperature ridges and the trough of middle and upper level constituted unstable stratification of the atmospheric. The convergence caused by weather systems and upfliting of Fushun mountain triggered heavy rainfall; the proper coupling of the exit region of high-level and low-level jet stream was the important reason of strong heavy rainfall in Fushun; the left front of low-level warm tongue and the maximum gradient of the moisture flux divergence was the drop zones of the strong rainstorm; the vertical configuration that low-level convergence and upper level divergence was momentum causes of strong storm; satellite imagery and Doppler radar data in nowcasting warning of this strong rainstorm played an important role.