The effects of initial vortex size on tropical cyclogenesis and intensification
The effects of initial vortex size on tropical cyclogenesis and intensification
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DOI：
10.1002/qj.3134
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发表时间：
2017-10
影响因子：
8.9
通讯作者：
G. Kilroy;Roger K. Smith
中科院分区：
文献类型：
--
作者：
G. Kilroy;Roger K. Smith
通过三个高分辨率的数值模拟，研究了初始涡旋大小对热带气旋生成和加强的影响，初始涡旋相对较弱，最大切向风速为5 m s−1，但位于不同的半径。在所有的模拟中，有一个渐进的组织对流诱导，气旋性的相对涡度到一个对流结构。随着初始涡尺寸的增加，组织发生得更晚。另外，涡度的大小、内外核切向风环流的大小以及涡旋的一生强度都变大。根据翻转环流的边界层控制对这种行为进行了解释。这一发现与以前的研究结果是一致的，这些研究绕过了起源阶段，并从明显更强的初始涡开始。
Three high‐resolution numerical simulations are carried out to investigate the effects of initial vortex size on tropical cyclogenesis and intensification, starting with a relatively weak initial vortex with a maximum tangential wind speed of 5 m s−1, but located at different radii. In all simulations, there is a progressive organization of convectively induced, cyclonic relative vorticity into a monopole structure. As the initial vortex size is increased, the organization occurs later. In addition, the size of the vorticity monopole, the sizes of the inner and outer core tangential wind circulations and the lifetime intensity of the vortex all become larger. An explanation for this behaviour is offered in terms of a boundary‐layer control of the overturning circulation. The findings are consistent with those of previous studies that bypass the genesis stage and start with appreciably stronger initial vortices.