RegCM3在青藏高原地区的应用研究：积云参数化方案的敏感性  

Application of Regional Climate Model (RegCM3) to the Tibetan Plateau: Sensitivity experiments for cumulus convection parameterization scheme

作　　者：杨雅薇[1] 杨梅学[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室

出　　处：《冰川冻土》2008年第2期250-258,共9页Journal of Glaciology and Geocryology

基　　金：国家重点基础研究发展计划(973计划)项目(2005CB422004)资助

摘　　要：为检验区域气候模式RegCM3在青藏高原地区的模拟能力,选择青藏高原地区的两个气候异常年(1997年少雨年和1998年多雨年)进行模拟,选取夏季(6-8月)分析RegCM3对青藏高原地区气候异常的模拟能力;积云参数化方案敏感性研究分别对1997年和1998年夏季选取不同的积云参数化方案进行对比分析.结果显示:RegCM3能够模拟出青藏高原1997年少雨年和1998年的多雨年气温基本特征,但在地形起伏较大地区模拟的温度偏低,对降水基本特征的模拟欠佳;两种积云参数化方案中,与Grell方案对比,Anthes-Kuo方案中总降水量的数量模拟更接近观测,但就温度和降水模拟的相关性上,Grell方案优于Anthes-Kuo方案.将RegCM3应用于青藏高原地区进行气候模拟时,选择Grell积云参数化方案比Anthes-Kuo方案更为适宜.To verify the simulating ability of RegCM3 in Tibetan Plateau, several experiments are done in this paper. Firstly, the periods from June to August in 1997 and 1998 are chosen as simulating period, when precipitation in the plateau was abnormal. The summer precipitation in 1997 was less than the mean value of recent 30 years. Contrarily, the summer precipitation in 1998 was more than the mean value of recent 30 years. Secondly, the sensitivity of temperature and precipitation to the scheme of cumulus convection was examined. The results demonstrated that the characteristics of temperature are able to be simulated, however, there are cold bias in the steep mountains and warm bias in the middle of Tibetan Plateau. The sensitive experiments show that cumulus parameterization scheme of Anther-Kuo is better than the scheme of Grell to simulate the convective precipitation. Moreover, the total precipitation simulated by Anther-Kuo scheme is closer to the observation. However, the Grell scheme is better when simutating the spatial pattern of temperature. Both schemes are not satisfaction in simulation of areas with steep mountains.

关 键 词：区域气候模式REGCM3 降水异常 Grell SCHEME Anthes-Kuo SCHEME 

分 类 号：P435[天文地球—大气科学及气象学]