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高原气象  2009 

不同辐射传输方案对P-σRCM9区域气候模式性能的影响

, PP. 1-11

Keywords: 区域气候模式,辐射传输方案,温度模拟,西风急流,降水模拟

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Abstract:

将NCARCCM3辐射传输方案CRM(ColumnRadiationModel)引入到P-σRCM9区域气候模式中,并对两组辐射传输方案下P-σRCM9区域气候模式模拟的东亚冬、夏季气候特征差异进行对比分析,发现采用CRM辐射传输方案能够改善P-σRCM9区域气候模式对中国区域冬、夏季地面温度的模拟,且在夏季的改善比冬季更明显,还改善了P-σRCM9区域气候模式对对流层高层(200~100hPa)短波辐射加热率和长波辐射加热率的计算,然后改进了模式对200~300hPa垂直平均经向温度梯度的模拟,进而使得模拟的冬、夏季东亚高空西风急流比采用KQ辐射传输方案的模拟结果更加接近NCEP/NCAR再分析资料。同时还发现,采用CRM辐射传输方案后,P-σRCM9气候模式模拟的中国地区冬、夏季的降水率在强度和分布形势上均比采用KQ辐射传输方案的模拟结果更接近观测,CRM辐射传输方案能够较明显地提高P-σRCM9气候模式对中国地区冬、夏季降水的模拟能力。

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