Kinematic Structure of Mesovortices in the Eyewall of Hurricane Ike (2008) Derived from Ground-Based Dual-Doppler Analysis
Kinematic Structure of Mesovortices in the Eyewall of Hurricane Ike (2008) Derived from Ground-Based Dual-Doppler Analysis
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由地面双多普勒分析得出的飓风艾克 (2008) 眼壁中中涡旋的运动学结构
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发表时间：
2016
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影响因子：
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通讯作者：
K. Knupp
中科院分区：
文献类型：
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作者：
S. Wingo;K. Knupp
摘要已有研究表明，热带气旋（TC）内核涡度混合可以促进中涡旋（MV）的形成并影响风暴强度。对mv的观察在很大程度上是偶然的，但对于提高对这些特征及其在TC动力学中的作用的理解是必要的。本研究对飓风艾克（2008）登陆前后眼壁的mv进行了近10小时的地基双多普勒分析。导出三维风，垂直涡度，水平散度和扰动压力进行了分析。结果表明持续的运动场排列和不断发展的垂直结构。摄动压力反演表明局部压力最小值与最小值有关。当风眼周围的气旋推进时，优先的上升气流位置似乎在当地最大涡度附近呈气旋性转变。根据已发表的观测数据集，Ike MVs的双多普勒上升气流幅度在TC垂直速度的前5%-10%。mv是我…
AbstractPrevious work has shown that vorticity mixing in the tropical cyclone (TC) inner core can promote mesovortex (MV) formation and impact storm intensity. Observations of MVs have largely been serendipitous but are necessary to improve understanding of these features and their role in TC dynamics. This study presents nearly 10 h of ground-based dual-Doppler analysis of MVs in the eyewall of Hurricane Ike (2008) near and during landfall. Derived 3D winds, vertical vorticity, horizontal divergence, and perturbation pressures are analyzed. Results indicate persistent kinematic field arrangements and evolving vertical structures. Perturbation pressure retrievals suggest local pressure minima associated with the MVs. Preferential updraft locations appear to transition cyclonically about the local vorticity maximum as the MVs progress around the eye. Based on published observational datasets, the dual-Doppler updraft magnitudes in Ike’s MVs are within the top 5%–10% of TC vertical velocities. The MVs are m...