RegCM3模式在西北地区的应用研究I:对极端干旱事件的模拟  

Application of Regional Climate Model(RegCM3) in North-west China I: Simulation of an arid extreme event

作　　者：鲍艳[1] 吕世华[1] 陆登荣[2] 侯瑞卿 

机构地区：[1]中国科学院寒区旱区环境与工程研究所 [2]甘肃省气象局兰州中心气象台,甘肃兰州730000 [3]河北省气象局,河北石家庄050000

出　　处：《冰川冻土》2006年第2期164-174,共11页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金重点项目(40233035);中国气象局兰州干旱气象研究所干旱基金项目(2005009)资助

摘　　要：为了检验区域气候模式RegCM3在西北地区的模拟能力，对2001年夏季西北地区极端干旱事件进行了模拟．结果表明：模式能很好地再现西北地区主要的环流特征和温度及降水的变化情况，主要的偏差在于高原上低压中心的模拟偏低，对西北东部对流层低层位势高度的模拟偏高．区域平均的温度模拟存在着1～3℃的冷偏差，偏差产生的原因与地表净辐射的负偏差有关．月降水量模拟远远偏大，最小的百分比偏差也达到了30％．模拟结果同时表明，由于受模式初始场的影响，6月降水和气温的模拟效果最差．RegCM3的模拟中还存在着许多问题，必须开展进一步的工作来提高模式的模拟效果，减少偏差．In order to test the performance of RegCM（v3. 0） in Northwest China, an arid extreme event of summer 2001 was simulated using this model. Results indicated that the simulation can well reproduce the main circulation characteristics, variation of air temperature and wind field, as well as precipitation over sub-regions. Comparing with the analysis, deviation of the large-scale features remained small. The most obvious deviation was the lower pressure centre over Qinghai-Tibet Plateau and the simulation of potential height in lower troposphere is to be high in the East of Northwest China. Regional-averaged air temperature had the cold bias of -1～-3 ℃, which was bound up with the negative deviation of surface net radiation in simulation. Too much rainfall was simulated with the minimum deviation percentage of 30%. Results also indicated simulation of air temperature and precipitation in June was the worst due to the influence of initial field of model. There are still a lot of problems in simulation of RegCM3. Further work should be done to improve the performance of RegCM3 over Northwest China.

关 键 词：西北干旱区 极端干旱 区域气候模式REGCM3 

分 类 号：P435[天文地球—大气科学及气象学]