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大气科学  2015 

影响辽东半岛两个台风Meari和Muifa暴雨环流特征的对比分析

DOI: 10.3878/j.issn.1006-9895.1503.14191

Keywords: 热带气旋 暴雨 环流特征 变性

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Abstract:

Meari(1105)和Muifa(1109)是两个路径相似并在辽东半岛产生强降水的热带气旋。但Meari强降水持续时间长,而Muifa时间短。利用中国气象局热带气旋年鉴、FY_2D(0.1°×0.1°)云顶亮温资料、大连地区逐时自动气象站降雨量资料、常规观测资料和NCEP/NCAR再分析资料,对两个台风影响辽东半岛的降水过程进行了对比分析。结果表明:(1)Meari影响辽东半岛时强度较弱,但与低空东南急流相连获得丰富水汽供应,衰减缓慢;Muifa影响时强度较强但与低空急流水汽通道快速断开而衰减迅速。(2)两个台风均进入西风槽区而变性,但两者影响辽东半岛时处于不同的变性阶段。Meari为半冷半暖结构,其北侧中尺度对流活动发展旺盛,非对称结构明显;Muifa低层环流已变性为冷中心,云系结构孤立且无发展。(3)两次过程中辽东半岛位于台风不同的对流发展区域是其降水强度差异的原因之一。辽东半岛位于Meari北侧,低层的水平辐合较强,水平风垂直切变较大,深厚的上升运动维持;Muifa影响下辽东半岛位于其西侧,受偏北风下沉气流控制,不稳定度和动力抬升条件减弱

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