The role of boundary‐layer friction on tropical cyclogenesis and subsequent intensification
The role of boundary‐layer friction on tropical cyclogenesis and subsequent intensification
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DOI：
10.1002/qj.3104
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发表时间：
2017-07
影响因子：
8.9
通讯作者：
G. Kilroy;M. Montgomery;Roger K. Smith
中科院分区：
文献类型：
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作者：
G. Kilroy;M. Montgomery;Roger K. Smith
将最近一个理想的高分辨率热带气旋发生数值模式模拟与地面阻力设为零的模拟进行了比较。结果表明，虽然在两种模拟中都出现了自旋，但无表面阻力的模拟中的涡旋达到其强化开始时间的时间是无表面阻力模拟的两倍。当不考虑表面摩擦时，模拟的涡核尺寸比有摩擦的情况下大得多，随后的涡强度明显弱于有摩擦的情况。在没有地面阻力的情况下，对流最终在没有任何系统组织的情况下发展，并且通常位于方位平均最大切向风的半径之外。这些结果强调了摩擦在组织新生涡旋核心的深对流中的关键作用，并提出了在数值模式中热带气旋发生的时间可能与模式中使用的边界层参数化方案有重要关系的可能性。
A recent idealized, high‐resolution, numerical model simulation of tropical cyclogenesis is compared with a simulation in which the surface drag is set to zero. It is shown that, while spin‐up occurs in both simulations, the vortex in the one without surface drag takes over twice as long to reach its intensification begin time. When surface friction is not included, the inner core size of the simulated vortex is considerably larger and the subsequent vortex intensity is significantly weaker than in the case with friction. In the absence of surface drag, the convection eventually develops without any systematic organization and lies often outside the radius of azimuthally averaged maximum tangential winds. The results underscore the crucial role of friction in organizing deep convection in the inner core of the nascent vortex and raise the possibility that the timing of tropical cyclogenesis in numerical models may have an important dependence on the boundary‐layer parametrization scheme used in the model.