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积云对流参数化方案对热带大气季节内振荡模拟的影响

, PP. 1341-1351

Keywords: 积云对流参数化方案,季节内振荡,大气环流模式,非绝热加热廓线

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Abstract:

?本文利用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(LASG)的大气环流谱模式的最新版本SAMIL2.2.3系统分析了积云对流参数化方案对热带大气季节内振荡(ISO)模拟的影响.结果表明该模式的三种积云对流参数化方案都能模拟出热带地区气候平均季节内振荡(CISO)时空演变的基本特征;其中Tiedtke方案相比于Manabe方案和Zhang-McFarlane方案,模拟出的CISO与观测更为接近.而SAMIL2.2.3模式对ISO年际变化部分(TISO)的模拟结果显示尽管SAMIL2.2.3相对于之前的版本对Tiedtke方案和Zhang-McFarlane方案针对不同问题做了必要调整,但三种积云参数化方案中只有Zhang-McFarlane方案能够模拟出27~50天TISO模态的东传特征.另外,SAMIL2.2.3与其较早版本SAMIL2.08中的Manabe方案完全相同,物理过程的其他部分如辐射方案和气溶胶条件有所调整,但仅后者能模拟出100°E以西热带27~50天TISO模态的东传特征.因此,模式发展过程中物理参数化方案的改进并非在每一方面上都产生正面效果.动力框架和物理过程,以及不同物理过程之间的协调发展是改进模式的重要途径.

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