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大气科学  2006 

LASG/IAP大气环流谱模式对陆面过程的敏感性试验

DOI: 10.3878/j.issn.1006-9895.2006.06.03

Keywords: 大气环流模式,陆面模式,陆气通量

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Abstract:

将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最近发展的高分辨率全球大气环流谱模式SAMIL-R42L26,分别与两个陆面模式--NCAR通用陆面模式CLM和简化的简单生物圈模式SSiB进行耦合.在比较了两个陆面过程模式,指出CLM改进方面的基础上,通过分析两个陆气耦合模式所模拟的陆气通量交换结果,指出新版本的陆气耦合模式(SAMIL-R42L26与CLM耦合)对表面感热、温度、降水率、潜热通量和海平面气压场的模拟能力大大提高,尤其对于夏季表面感热通量场,使亚洲北部和东南部、格陵兰岛以及北美洲大部分地区的数值从100W/m2降低到接近60W/m2,与NCEP再分析资料一致.新版本的陆气耦合模式模拟陆地表面能量收支趋于平衡,为下一步发展海-陆-气-冰耦合气候系统模式提供保障.采用CLM陆面模式,SAMIL-R42L26能较好地模拟亚洲季风区地表感热和潜热的季节演变趋势,而采用SSiB陆面模式的结果,则存在较大误差.文中的结果表明,不同的陆面模式所模拟的大气下垫面(包括洋面)通量发生的变化,通过陆气耦合过程产生的影响不仅仅是局地性的,而且是全球范围的.

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