“莫兰蒂”台风致灾大风结构特征及成因分析
投稿时间: 2018-02-03  最后修改时间: 2018-03-18  点此下载全文
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作者单位E-mail
陈德花 厦门市气象局 dehua_chen@163.com 
张玲 厦门市气象台  
张伟 厦门市气象台  
基金项目:国家自然科学基金项目(41705045);福建省自然科学基金项目(2016J01182);厦门市科学技术局科技惠民项目(3502Z20164083);中国气象局预报员专项(CMAYBY2017-036);福建省气象局开放基金项目(2016K02);福建省强降水机理研究创新团队;厦门市气象局海洋精细化预报创新团队
中文摘要:本文基于多种观测资料和数值模拟,分析1614号“莫兰蒂”台风致灾大风的风场结构特征及成因。“莫兰蒂”台风是继5903号台风以来影响厦门地区最强的台风,其强风的影响范围相对较小,主要集中在台风本体附近。通过分析局地强风和台风的相关性发现;登陆前台风环流内的局地强风呈现阶段性波动特征,局地强风相对台风方位角的变化随着台风靠近先出现顺转后逆转。基于台风风压关系的分析表明,“莫兰蒂”强度估计和实测吻合。台风登陆后受地形摩擦作用,使得台风左侧的风速大于右侧。通过数值模拟分析,在影响局地强风过程的主要物理因子中,风矢量的水平平流和气压梯度项的影响最为主要。“莫兰蒂”台风的强风区呈现明显的中尺度特征,通过较高动量的空气垂直输送和动量下传作用,导致眼壁周围风力增强。
中文关键词:“莫兰蒂”,致灾大风,风压关系 ,数值模拟
 
Architectural Feature and Causes Analysis of the Catastrophic Wind Caused by Super Typhoon‘Meranti’
Abstract:Using various of observation data and numerical simulation. The catastrophic wind caused by super typhoon ‘Meranti’ is studied. This is the strongest typhoon ever influenced Xiamen since number 5903 typhoon. The radius of its impact is relatively small and concentrates in its core area. Before landfall, local strong wind in ‘Meranti’ shows fluctuating characteristic. Strength analysis based on the wind- pressure relation is completely compatible with observation. After landfall of ‘Meranti’, friction effect makes the wind in its left side stronger the right side. Numerical analysis shows that advection of wind vector and pressure gradient are the main factors that caused the catastrophic wind. The strong wind structure of ‘Meranti’ shows significant meso-scale features. Wind near eye-wall is strengthened through Momentum transfer effect.
keywords:‘Meranti’, catastrophic wind, wind-pressure relationship, numerical simulation
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