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中文摘要：
利用MM5（V3.6）模式对2003年6月低纬高原地区一次大暴雨过程进行了数值模拟和地形敏感性试验,从重力波的角度研究低纬高原地区MβCSs生命史较短这一地域特征形成的原因。分析表明,大气稳定层结利于重力波的产生和传播,重力波的传播导致MβCSs的能量向两侧快速频散,使得成熟的MβCSs主体强度减弱,两侧有新的MβCSs生成并发展,中心降水也迅速减弱。地形敏感性试验表明,低纬高原地形使得大气在不稳定能量积累以后很快释放触发强降水,大气随即转化为稳定层结,利于重力波的快速传播和MβCSs主体能量的迅速频散,使得低纬高原地区触发暴雨的MβCSs生命史较短,引发的降水具有突发性强、历时短的特征。
英文摘要：
MM5（V3.6）was used to make numerical modeling on a heavy storm rainfall event which occurred on low latitude plateau in June 2003.Terrain sensitivity experiment was carried out to study the reasons of Mβ CSs＇s structure features on low latitude plateau by using Gravity Wave theory.The result shows that stable stratification is beneficial for gravity wave＇s growing and spreading,and the spreading of gravity wave leads to rapid dispersing of energy,which wakens the main part of Mβ CSs and produces new Mβ CSs around.Thus,precipitation is promptly weakened.Terrain sensitivity experiment reveals that the terrain of low latitude plateau makes strong unstable energy release rapidly,which attributes to heavy precipitation.Thus,the atmosphere changes to stable stratification,which is beneficial for Gravity Wave＇s rapid spreading and the rapid dispersing of main part of Mβ CSs.Therefore,on low latitude of plateau,the Mβ CSs which contribute to storm rainfall have short life-time,and the storm rainfall breaks out intensively in a short time.
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