“98.5”华南前汛期暴雨云微物理场数值模拟分析  

Numerical Simulation and Analysis on the Cloud Microphysics Fields of "98.5" Heavy Rainfall of South China in Pre-Summer Flood Season

作　　者：文莉娟[1] 程麟生[1] 左洪超[1] 吕世华[2] 

机构地区：[1]兰州大学大气科学学院甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730000 [2]中国科学院寒区旱区环境与工程研究所甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730000

出　　处：《高原气象》2006年第3期423-429,共7页Plateau Meteorology

基　　金：国家重点基础研究发展规划项目(2005CB4222003);国家重点基础研究项目(G1998040907)资助

摘　　要：为了进一步理解暴雨发生过程中云微物理场的演变和云微物理过程与动力、热力过程的相互作用，利用非静力中尺度数值模式MM5对1998年5月23-24日的华南暴雨过程进行了模拟，并详细分析了模拟结果。分析结果表明：利用混合冰相显式物理方案比其它方案模拟的降水更接近实际情况；云微物理场的模拟显示没有雪出现，这可能是华南降水云微物理的特点；每小时降水量有先减弱后又增强的趋势，暴雨过程中云的各微物理量的变化趋势与其一致；云的发展与良好的热力动力条件互相作用、共同加强，由南风带来的充足的水汽和热量为其发展提供前提条件，凝结潜热使上升运动向更高处伸展。In order to fully understand the evolution of the microphysics fields of cloud and the reaction between the cloud physics process and the thermodynamics, the simulated results using the mesoscale model MM5 were analyzed detailedly. The simulated results using the mixed ice phase scheme was the best, because the simulated areas and values of this heavy rainfall were the quite close to the observed. There were no snow in the simulated results, and it was due possibly to the particular cloud microphysics field of South China. The simulated precipitation in each hour usualy weaken first and strengthen then, the physics variables of cloud had the same changes. Heat and vapor transported by the south jet stream were the premise of this rainfall, and latent heat made vertical motion stretched higher.

关 键 词：华南暴雨 云微物理过程 混合冰相显式物理方案 

分 类 号：P458[天文地球—大气科学及气象学]