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大气科学  2005 

边界层动力"抽吸泵"对青藏高原低涡的作用

DOI: 10.3878/j.issn.1006-9895.2005.06.12

Keywords: 边界层,抽吸,高原低涡,结构,发展

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Abstract:

考虑热带气旋类青藏高原低涡为受加热和摩擦强迫并满足热成风平衡的轴对称涡旋系统,通过求解线性化柱坐标系中涡旋模式的初值问题,分析了高原边界层动力"抽吸泵"对高原低涡结构及发展的作用,得出了特定热力、动力作用下高原低涡水平流场和垂直流场的典型结构特征,并讨论了低涡发展与边界层抽吸作用的关系.结果表明:高原上较强的边界层动力"抽吸泵"作用对高原低涡的流场结构及发展有重要影响.当边界层动力"抽吸泵"表现为"抽"的效应时,有利于边界层中对流活动的发展;反之表现为"吸"的效应时,有利于边界层以上的高原低涡的加强.

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