谱模式中负地形的处理与东亚副热带气候的模拟  

Disposal of Negative Orography in a Spectral Model and Modeling of Subtropical Climate in East Asia

作　　者：刘屹岷[1] 吴国雄[1] 刘辉[1] 

机构地区：[1]中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京100029

出　　处：《大气科学》1999年第6期652-662,共11页Chinese Journal of Atmospheric Sciences

基　　金：国家重点基础研究发展规划项目;国家自然科学基金

摘　　要：谱模式中负地形对气候模拟有来重干扰。本文重新处理ＩＡＰ／ＬＡＳＧ ＧＯＡＬＳ模式地形及海陆分布，通过对比新旧地形强迫下数值试验的结果，揭示了原有ＧＯＡＬＳ／ＬＡＳＧ 气候模式对西太平洋副高模拟中存在的系统偏差与（３０°Ｎ，１２０°Ｅ） 长江口附近的负地形及纬向地形谷有关。与ＮＣＥＰ／ＮＣＡＲ 再分析资料和ＣＭＡＰ 综合分析资料比较表明，新的地形方案减弱了负地形效应，使东亚气候，如夏季西太平洋副热带高压及夏季降水的模拟得到明显改善。Motivated by the serious impact of negative orography on climatic simulation in spectral models, the orography presentation has been renewed in the global climate model IAP/LASG GOALS. Based on comparison between results from old and new orographic experiments, it is revealed that the originally systemic deviation of modeling on the Western Pacific Subtropical High is related to the negative orography at 30 o N, 120 o E and along the latitude to its east. By comparing these model results with the reanalysis data of NCEP/NCAR and CMAP, it can be concluded that the effects of negative orography can be suppressed to a great deal under the new orography scheme, and therefore the simulation of East Asia subtropical climate can be distinctly improved.

关 键 词：谱模式 负地形 副热带高压 热带气候 

分 类 号：P461.3[天文地球—大气科学及气象学] P444