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大气科学  2008 

变性台风Winnie(9711)环流中的锋生现象

DOI: 10.3878/j.issn.1006-9895.2008.03.18

Keywords: 台风,变性加强,锋生,非地转湿Q矢量

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Abstract:

基于T106一日四次1.125°×1.125°格点资料,采用非地转湿Q矢量对登陆台风Winnie(9711)变性加强过程中环流内的锋生现象进行诊断分析。结果表明,Winnie变性加强与其环流内的中尺度锋生过程密切相关,其低层环流中可发现包围台风中心的环状锋生现象。其中,北侧锋带与西侧锋带在结构、性质上有所不同,北侧锋具有暖锋特征,而西侧锋具有冷锋特点。台风残余低压环流中心位于两条锋带的交汇处,其变性加强过程类似于一个温带气旋在地面锋上的发展过程。Winnie变性加强过程中,北侧暖锋锋生强,锋面次级环流明显,降水区主要出现在该锋带附近。西侧冷锋锋生弱,无明显锋面次级环流,降水不明显。强锋生区首先在台风上空高层产生,随后增强下传,加强了低层锋生过程。中低层锋生强度以及锋上垂直运动与凝结潜热作用有密切关系。

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