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北大西洋涛动与西北太平洋热带气旋频数关系的年代际变化

, PP. 1026-1033

Keywords: 热带气旋频数,北大西洋涛动,年代际,波活动通量大气环流

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Abstract:

?基于观测资料分析,研究了夏季北大西洋涛动与西北太平洋热带气旋频数之间的关系,发现两者的联系呈现由弱转强的年代际变化特征.1948~1977年,北大西洋涛动与西北太平洋热带气旋频数的联系较弱;但1980~2009年,两者转为显著的正相关,北大西洋涛动偏强(弱)对应西北太平洋热带气旋数偏多(少).本文进一步从大气环流变化角度,探讨了北大西洋涛动与西北太平洋热带气旋频数的关系在前后两个时段出现不同的可能原因.结果表明,在后一时段,当北大西洋涛动偏强时,西北太平洋低层为异常气旋型环流,季风槽加强,西太平洋副热带高压偏东,西北太平洋地区高层大气异常辐散,低层大气异常辐合,这些条件均有利于热带气旋的生成和发展,西北太平洋热带气旋因此偏多.然而,在前一时段,北大西洋涛动对上述环流系统的影响不明显,因而减弱了北大西洋涛动与西北太平洋热带气旋频数的联系.研究进一步揭示,与北大西洋涛动异常相关联的波活动通量的变化可以解释北大西洋涛动与西北太平热带气旋频数联系的这种年代际变化.

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