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.
出处
《大气科学学报》
CSCD
北大核心
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)
关键词
淮河流域
暴雨
大别山
敏感性试验
Huaihe River basin
heavy rainfall
Dabie mountains
sensitivity experiment
