大气环流模式CAM中土壤冻融过程改进对东亚气候模拟的影响  

Impact of Improved Soil Freezing Process on Climate in East Asia Using NCAR CAM Model

作　　者：李震坤[1,2] 朱伟军[1] 武炳义[2] 

机构地区：[1]南京信息工程大学,南京210044 [2]中国气象科学研究院,北京100081

出　　处：《大气科学》2011年第4期683-693,共11页Chinese Journal of Atmospheric Sciences

基　　金：国家重点基础研究发展计划项目2007CB411505;财政部/科技部公益性行业专项GYHY200706005;国家自然科学基金资助项目40875052;40921003

摘　　要：本文在改进了大气环流模式NCARCAM3.1中的土壤冻融过程参数化的基础上,模拟研究了改进的冻土过程对东亚气候模拟的影响。模拟结果分析表明,改进冻融过程参数化后,冬季欧亚大陆上大部分地区大气对地表的加热偏强,而夏季地表对大气的加热偏强,尤其是青藏高原对大气的加热作用显著增强。东亚气候对冻土过程参数化方案非常敏感,冬、夏两季地表气温都有显著的变化。在模式中合理考虑土壤冻融过程后,模拟的冬季西伯利亚高压增强,东亚大槽位置偏西;东亚夏季风增强,副热带高压增强西伸和偏北,造成华北和长江中下游降水偏多,华南降水偏少。此结果对改进气候模式对东亚气候模拟能力有重要意义。An improved frozen soil parameterization scheme is introduced and its effects on climate in East Asia are investigated by using the latest version of general circulation model（GCM） CAM3.1 developed at NCAR.Simulation results show that the improved soil freezing process leads to enhanced heating of the earth＇s surface by the atmosphere over most parts of Eurasia in winter,while it leads to enhanced heating of the atmosphere by the earth＇s surface in summer,especially the abnormal heating is significantly strengthened over the Tibetan Plateau.The climate in East Asia is very sensitive to the frozen soil parameterization with notable change of the surface air temperature in both winter and summer.With the improved soil freezing process,the simulated Siberian high is enhanced and the East Asia trough moves westward in winter;the East Asian summer monsoon is intensified,and the western Pacific Ocean subtropical high extends northwestward,resulting in increasing rainfall in northern China and the middle and lower reaches of the Yangtze River and decreasing rainfall in South China.These results may have meaningful implications for improving the performance of GCM to simulate the climate in East Asia.

关 键 词：冻土 东亚 参数化 

分 类 号：P435[天文地球—大气科学及气象学]