成都“2008.9.24”暴雨的中尺度数值模拟  

Case Study with Meso-scale Weather Forecast System WRF about Thunder-storm over Chengdu on the Sep 24th in 2008

作　　者：余卓晟[1,2] 陈科艺[1] 

机构地区：[1]成都信息工程学院大气科学学院高原大气与环境四川省重点实验室 [2]中国人民解放军77649部队

出　　处：《成都信息工程学院学报》2012年第5期495-500,共6页Journal of Chengdu University of Information Technology

基　　金：四川省教育厅科研基金资助项目(12ZB020)

摘　　要：为了更好的研究四川成都地区2008年9月23日～25日强降水天气的物理机制,利用中尺度天气预报模式(Weather Research Forecast,WRF)模拟了此次过程,并结合FY-2号C星云图资料,对过程的发生、发展过程进行分析后发现,此次暴雨过程为低层弱低压辐合,同时台风"黑格比"登陆后带来大量水汽,并借助西伸的西太平洋副高源源不断的向四川盆地输送,另外存在来自南方孟加拉湾水汽的持续供应,对流云团形成于地面低压与西伸副高的交界处,并沿着副高边缘由西南向东北移动,雨带分布在副高边缘气压梯度大的地方,模拟结果与观测事实基本相符。利用WRF模式模拟暴雨产生的环流形势,配合卫星云图,能进一步揭示暴雨产生的物理机制,可作为深化暴雨研究的有效手段。In order to study the mechanism of the heavy precipitation process in Chengdu in Sichuan province Irom the Sep. 23rd to the Sep. 25th, we used the meso-scale weather forecast system WRF （Weather Research Forecast） to simulate this case. Compared simulation results with the observation, and combined with the satellite images from FY2-C, we analyzed the occurrence and the process of the strong convective weather over Chengdu. Some principal conclusions have been achieved： Depression convergence at low level helps upward motion and lots of water vapor has been continually brought to Sichuan basin by the landfall of the typhoon Haqupit with the westward extension of the western Pacific Subtropical High, besides, the water vapor from Bay of Bengal was also provided constantly. Com- pared simulation results with the observation, basically, the convective clouds moved along the edge of the subtropical high, and the rain-bands distributed over the sharp pressure gradient region at the subtropical high edge. It＇s been found that simulation results are in consistent with the observation as for the precipitation district and rainfall amount. Therefore, WRF and satellite images are effective ways to detect the mechanism of the heavy precipitation.

关 键 词：暴雨 数值模拟 中尺度天气预报模式 强对流天气 

分 类 号：P458.121.1[天文地球—大气科学及气象学]