论文部分内容阅读
利用WRFV2.2中尺度数值模式, 对2007年7月8～9日发生在淮河流域的梅雨锋暴雨进行了模拟及相关的地形敏感性试验.结合这次暴雨过程特征, 详细分析了大别山地区地形及皖东南地区地形分别对安徽北部、湖北北部和河南东南角、江苏中部降水的影响.结果表明: 在这次降水过程中, 如果没有大别山地区的地形, 安徽北部一带的700 hPa天气系统的发展或移动速度更快, 相关区域降水将加大, 地形在鄂豫地区产生的切变消失, 相应的降水消失, 且地形切变与气流切变叠加时降水更大, 在一定的系统配置条件下, 大别山地区的地形可以影响江苏地区降水的发生、发展;如果没有皖东南地区的地形, 安徽北部系统略有发展, 大别山地区的地形切变作用减弱, 江苏中部的降水大范围减小.“,”The mesoscale numerical model WRFV2.2 was used to simulate the Meiyu front rainstorm that occurred over the Huaihe River drainage area during 8～9 July 2007 (07.7 for short). Correlative orographic sensitivity experiments were made. The character of the rainfall was analyzed with sensitivity experiments, taking into account the effect that the terrain of Dabieshan area and Southeast of Anhui Province have on the precipitation of North Anhui province, North Hubei province, Southeast Henan province, and central Jiangsu Province. The result shows: That during the rainfall, the synoptic system on 700 hPa in the North of Anhui would have developed and moved more quickly and the rainstorm would have become stronger if the terrain of Dabieshan area did not exist. Under the same assumption, there would have been no orographic shear in the regions of Hubei and Henan and the orographic rain would have disappeared. With certain synoptic system allocation, the terrain of Dabieshan area would have an impact on the development of the 07.7 rainstorm in Jiangsu Province. If the terrain of southeast region of Anhui did not exist, the synoptic system on 700 hPa in the North of Anhui would have had only little development and the effect of the orographic shear produced by the terrain of Dabieshan area would have got weaker. Accordingly, the rain belt covering central Jiangsu Province would have been smaller.