包络地形和重力波拖曳对区域气候模拟效果的影响  

Effects of Envelope Orography and Gravity Wave Drag Parameterization on Regional Climate Simulations

作　　者：刘华强[1] 钱永甫[2] 

机构地区：[1]南京气象学院气象灾害与环境变化开放实验室,南京210044 [2]南京大学大气科学系,南京210093

出　　处：《大气科学》2001年第2期209-220,共12页Chinese Journal of Atmospheric Sciences

基　　金：国家"九五"攻关项目!96-908-02-04-04;国家自然科学基金资助项目!49735170

摘　　要：用ＮＣＡＲ区域气候模式（ＲｅｇＣＭ２）的数值试验，研究了包络地形和地形重力波拖曳作用对１９９１年５、６月份中国区域内气候模拟效果的影响。通过试验结果的对比分析发现，在模式中引入地形重力波拖曳作用可在一定程度上改善模式对气候系统和要素的模拟效果，使模拟结果更符合气候实况。包络地形对模拟结果也有一定的改善，但对于细网格的区域气候模式（ＲＣＭ）来说，其效果不如重力波拖曳明显。不论是地形重力波拖曳还是包络地形，在模式积分的初期，它们的作用并不明显，随着积分时间的增长，它们对模拟结果的影响程度增大。The regional climate model (RegCM2) of NCAR is used to study the effects of envelope orography and gravity wave drag on the regional climate in China during May and June of 1991. Analysis and comparison of the model results show that the introducing of gravity wave drag to the model can improve the model performance to some extent and result in more realistic simulation, and the effect of envelope orography on regional climate simulation is less significant than that of gravity wave drag. The results also show that both gravity wave drag and envelope orography have smaller influence on model results in the beginning of simulation, but greater in the later stage.

关 键 词：区域气候模拟 包络地形 地形重力波 抑曳作用 RCM 中国 

分 类 号：P461.3[天文地球—大气科学及气象学]