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大气科学  2009 

陆面过程模型CoLM与区域气候模式RegCM3的耦合及初步评估

DOI: 10.3878/j.issn.1006-9895.2009.04.08

Keywords: 陆面过程模型,区域气候模式,耦合

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Abstract:

陆面过程通过影响陆面和大气之间物质(如,水分)和能量的交换影响气候,其参数化方案对数值天气预报、全球及区域气候模拟有重要影响。本研究利用对生物物理、生物化学过程考虑更全面的陆面模式CommonLandModel(CoLM)替代区域气候模式RegCM3原有的陆面模式BATS,发展了耦合区域气候模式C-RegCM3;将其应用于东亚地区典型洪涝年份夏季气候模拟以进行评估,结果表明新耦合的模式C-RegCM3能合理模拟大尺度环流场、近地表气温和降水的分布特征,对西北半干旱地区降水模拟比RegCM3有所改进。通过利用区域气候模式C-RegCM3及RegCM3对地表能量和水文过程模拟结果的比较,发现在半干旱、半湿润过渡区C-RegCM3模拟的潜热增大、感热减小;模拟的地表吸收太阳辐射差异较明显的地区位于模式模拟的主要雨区;C-RegCM3在上述过渡区模拟的夏季地表土壤湿度比RegCM3偏干,这与它在过渡区降水模拟偏少、蒸散发模拟偏大相对应,体现了该模式在半干旱、半湿润过渡带模拟出比RegCM3更明显的局地土壤湿度-降水-蒸散发之间的正反馈作用。

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