Environmental Dynamical Control of Tropical Cyclone Intensity—An Observational Study
Environmental Dynamical Control of Tropical Cyclone Intensity—An Observational Study
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DOI：
10.1175/mwr3278.1
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发表时间：
2006-04
影响因子：
3.2
通讯作者：
Zhihua Zeng;Yuqing Wang;Chun‐Chieh Wu
中科院分区：
文献类型：
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作者：
Zhihua Zeng;Yuqing Wang;Chun‐Chieh Wu
摘要利用1981-2003年西北太平洋热带气旋观测资料，分析了转捩速度和垂直风切变两个环境动力因子对热带气旋强度、强度和一生最大强度的影响。总的来说，快速平移和强垂直切变对TC的增强和一生的峰值强度都是负的。非常强烈的TC和具有快速增强速率的TC都只出现在3到8 m s-1之间的狭窄平移速度范围内，并且垂直切变相对较弱。绝大多数西北太平洋热带气旋在转向之前达到其一生的峰值强度，此时环境导向流和垂直切变都很弱。结果表明，当热带气旋的移动速度超过15 m s-1，或者当它们的大尺度环境垂直切变大于20 m s-1时，很少有热带气旋会增强。TC的强化率被发现增加…
Abstract The effects of two environmental dynamical factors, namely, the transitional speed and vertical wind shear, on tropical cyclone (TC) intensification, intensity, and lifetime peak intensity were analyzed based on observations in the western North Pacific during 1981–2003. In general, both the fast translation and strong vertical shear are negative to both TC intensification and the lifetime peak intensity. Both the very intense TCs and the TCs with rapid intensification rate are found only to occur in a narrow range of translational speeds between 3 and 8 m s−1, and in relatively weak vertical shear. The overwhelming majority of western North Pacific TCs reach their lifetime peak intensity just prior to recurvature where their environmental steering flow and vertical shear are both weak. The results show that few TCs intensified when they moved faster than 15 m s−1, or when their large-scale environmental vertical shear is larger than 20 m s−1. The intensification rate of TCs is found to increase ...