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大气科学  2007 

BATS1e陆面模式对p-σ九层区域气候模式性能的影响

DOI: 10.3878/j.issn.1006-9895.2007.01.16

Keywords: 陆面模式,区域气候模式,数值模拟,模式性能

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Abstract:

将BATS1e(Biosphere-AtmosphereTransferSchemeversion1e)陆面模式与p-σ九层区域气候模式(PσRCM9)进行耦合,发展了一个包含有更复杂陆-气相互作用的区域气候模式(BATS1e-PσRCM9)。通过对东亚地区1月和7月气候平均场和1991年江淮流域梅雨期间三次强降水过程的数值模拟,考察了BATS1e陆面模式对PσRCM9模式模拟性能的影响。数值试验结果表明,BATS1e-PσRCM9模式对东亚区域冬、夏季气候平均场的模拟能力有明显提高,且对近地层和对流层低层各气象要素场模拟效果的改善比对流层中高层更加明显。与PσRCM9模式的模拟结果相比,BATS1e-PσRCM9模式对中国东南部地区降水的模拟与观测更为一致,并且对江淮流域梅雨期间的强降水过程也有较好的模拟能力。由于BATS1e-PσRCM9模式改进了地气之间动量、热量和水汽通量交换的计算,更好地描述了陆地下垫面与大气之间的相互作用,从而改善了模式对近地层各气象要素场的模拟。因此,通过耦合BATS1e陆面模式能较明显地提高PσRCM9模式模拟东亚区域短期气候变化的能力,这为区域气候模式的进一步发展奠定了基础。

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