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大气科学  2006 

亚洲夏季风爆发与热源强迫下的热带大气Rossby波

DOI: 10.3878/j.issn.1006-9895.2006.06.17

Keywords: 热源强迫,非线性赤道Rossby波,南海夏季风,涡对

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Abstract:

对南海夏季风爆发前的风场和局地对流凝结加热强迫作用进行了合成分析,表明南海夏季风爆发前局地对流凝结加热作用对与南海夏季风爆发密切相关的低频涡对的产生起着重要作用.然后,从动力学的角度研究了带有外部热源强迫的赤道β平面上的Rossby波,利用Gardner-Morikawa变换和摄动展开方法,得到了热源强迫下描写赤道Rossby的mKdV方程,进而得到了不同热源形式下切变气流中赤道非线性Rossby波的解析解.结果表明,不同类型的热源对赤道Rossby波的结构起着非常重要的作用,同时也为南海夏季风爆发前低频涡对的形成给出了一种动力学解释.

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