一次淮河流域梅雨锋暴雨的大别山地形敏感性试验  

Sensitivity experiments of effects of Dabie mountains terrain on Meiyu front rainstorm over Huaihe River basin

作　　者：郭蕊[1,2] 苗春生[1] 张楠[3] 

机构地区：[1]南京信息工程大学大气科学学院,江苏南京210044 [2]河北省气象服务中心,河北石家庄050021 [3]天津市气象台,天津300074

出　　处：《大气科学学报》2013年第5期626-634,共9页Transactions of Atmospheric Sciences

基　　金：国家科技支撑计划课题(2007BAC29B06)

摘　　要：利用NCEP/NCAR提供的TRMM资料、FNL资料和再分析资料,应用WRFV3.2中尺度模式对2011年6月23—24日淮河流域梅雨锋暴雨进行了数值模拟,并通过一系列地形敏感性试验,详细分析了大别山地形对暴雨的影响。结果表明:1)大别山地形会强迫底层西南暖湿气流绕流和抬升,形成扰动并使其所含水汽和不稳定能量沿途释放,形成带状降水;2)大别山地形会使暖湿气流与偏北气流交汇形成带状分布的小槽,降水与气流辐合带方向一致;3)当地形增高时,降水中心位置变化不大,但对流更加剧烈;若使地形降低或消失,江苏淮河流域降水中心明显东移,说明大别山减弱了降水系统的东移,并使大值降水分布相对集中。Based on the NCEP/NCAR TRMM, FNL and reanalysis data, the mesoscale numerical model WRFV3.2 is used to simulate the Meiyu front rainstorm over the Huaihe River basin during 23--24 June 2011. A series of sensitive experiments are carded out to research the effect of the terrain of Dabie mountains on the rainstorm. Results show as follows： 1 ）The terrain of Dabie mountains can force the southwest warm-wet flow to uplift and flow around the mountains, which produces perturbation and is conducive to release unstable energy, condense water vapor, and form rain band. 2） Due to the terrain of Dabie mountains ,the warm-wet flow meets the north air stream, the troughs exhibit zonal distribution, and the rain band is consistent with the flow convergence band. 3 ） If the terrain of Dabie mountains in- creases, the convection would be more severe. If the terrain of Dabie mountains decreases or disap- peares, the rainfall center at Huaihe River basin would shift eastward apparently. Therefore, the terrain of Dabie mountains can weaken the eastward movement of synoptic system, and concentrate the heavy rainfall.

关 键 词：淮河流域 暴雨 大别山 敏感性试验 

分 类 号：P426.62[天文地球—大气科学及气象学]