A unified view of tropical cyclogenesis and intensification
A unified view of tropical cyclogenesis and intensification
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DOI：
10.1002/qj.2934
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发表时间：
2017
影响因子：
8.9
通讯作者：
G. Kilroy;Roger K. Smith;M. Montgomery
中科院分区：
文献类型：
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作者：
G. Kilroy;Roger K. Smith;M. Montgomery
热带气旋生成的理想化高分辨率数值模拟是在一个模式中提出的，该模式仅用暖雨过程来代表深对流。从一个最初很弱的、无云的、轴对称的暖心涡旋（在100公里半径处最大风速为5 m s−1）开始，涡旋在大约2天的孕育期后开始迅速增强。从三维的角度来看，其成因过程类似于旋转对流模式中的涡旋强化，从更强的初始涡旋开始（Vmax = 15 m s−1）。深对流和对流放大的气旋性相对涡度在生成期远不是轴对称的。此外，气旋性的相对涡度组织成一个气旋结构发生在相对较低的风速，最大的本地风速之前，已经明显增加。正压过程被证明在加强开始时间附近的几个小时内，在帮助巩固单符号涡度方面起着重要的作用。
Idealized high‐resolution numerical simulations of tropical cyclogenesis are presented in a model that represents deep convection by a warm rain process only. Starting with an initially weak, cloud‐free, axisymmetric warm‐cored vortex (maximum wind speed 5 m s−1 at a radius of 100 km), rapid vortex intensification begins after a gestation period on the order of 2 days. From a three‐dimensional perspective, the genesis process is similar to that in the rotating convection paradigm for vortex intensification starting with a much stronger initial vortex (Vmax = 15 m s−1). The patterns of deep convection and convectively amplified cyclonic relative vorticity are far from axisymmetric during the genesis period. Moreover, the organization of the cyclonic relative vorticity into a monopole structure occurs at relatively low wind speeds, before the maximum local wind speed has increased appreciably. Barotropic processes are shown to play an important role in helping to consolidate a single‐signed vorticity monopole within a few hours near the intensification begin time.