江淮地形对一次梅雨锋暴雨影响的数值模拟试验  

Numerical Simulation Test for the Effects of the Landform on a Meiyu Front Rainstorm in Jiang-huai Area

作　　者：易军[1] 寿绍文[1] 王玉昆[1,2] 

机构地区：[1]南京信息工程大学大气科学学院,江苏省气象灾害重点实验室,江苏南京210044 [2]吉林省气候中心,吉林长春130062

出　　处：《安徽农业科学》2008年第31期13768-13770,共3页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金项目(40775033;40405009;40575022;40-875025)

摘　　要：利用WRF-V2.1模式对2007年7月8日至9日一次江淮地区暴雨过程进行数值模拟以及地形敏感性试验。研究表明,大别山地形对这次降水过程中有着重要影响,在迎风坡,地形强迫暖湿气流气旋性辐合上升,降水量增加,至山顶气流辐合上升运动减弱,反气旋性辐散增强,降水量减少;而在背风坡,下坡风和绕山气流影响大气垂直运动,引起降水量变化;同时,地形激发中尺度波动,造成降水阵性分布。The numerical simulation and landform sensitivity test were made on a rainstorm process in Jiang-huai Area during July 8th-9th of 2007 by using WRF-V2.1 model.The research indicated that the landform of Dabie Mountain had important effects on the rainfall process.In the windward slope,the landform forced the cyclonic convergence of warm-wet airflow to be increased and the precipitation was increased.At the mountaintop,the ascending motion of airflow convergence weakened,the anticyclonic divergence strengthened and the precipitation decreased.In the leeward slope,downslope wind and bypass-hill airflow affected the atmospheric vertical motion,which led the precipitation changes.At the same time,the landform activated the meso-scale fluctuation and caused the intermittent distribution of rainfall.

关 键 词：数值试验 地形强迫 暴雨 

分 类 号：S161.63[农业科学—农业气象学]