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大气科学  2011 

登陆台风卡努(0515)内核区环流结构特征分析

DOI: 10.3878/j.issn.1006-9895.2011.01.06

Keywords: 登陆台风,地基雷达轨迹显示技术,轴对称环流结构,非对称结构

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Abstract:

本文采用地基雷达轨迹显示技术(GroundBasedVelocityTrackDisplay,简称GBVTD)反演的雷达风场资料,分析台风卡努(0515)在登陆期间近中心环流结构特征。轴对称环流结构分析表明,登陆前卡努轴对称切向风速最大值出现在眼墙区域2km高度附近,最大风速半径随高度向外倾斜。轴对称径向入流主要位于低层,而上升气流主要出现在眼墙区和外围雨带区内。台风最大风速半径在登陆前几乎不变,但登陆后逐渐內缩。登陆过程中,轴对称切向风速值总体随时间呈明显减弱的趋势,但在中低层存在波动,特别是在登陆前半小时,切向风速突然增强。此外,登陆后最大轴对称切向风速高度明显抬升,伴随着外围雨带区上升流显著减弱。同时台风低层入流增强、厚度增加、范围向内和向外扩展。非对称环流结构显示:登陆过程中,台风眼墙区切向风环流和雷达回波均呈显著的一波不对称结构。其中大风速区和强降水区的位置相对于台风移动方向和垂直风切变方向有显著的规律性分布。由于卡努移动速度较快,且登陆期间受强垂直风切变影响。因此,其不对称结构应是垂直风切、台风移动和陆气相互作用三者共同作用的结果。

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