An observational study of multiple tropical cyclone events in the western north Pacific
An observational study of multiple tropical cyclone events in the western north Pacific
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DOI：
10.1111/j.1600-0870.2009.00435.x
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发表时间：
2010-01
期刊：
影响因子：
--
通讯作者：
Kyle D. Krouse;A. Sobel
中科院分区：
文献类型：
--
作者：
Kyle D. Krouse;A. Sobel
摘要利用最佳路径和NCEP/NCAR再分析资料，研究了西北太平洋多气旋事件（MCE）的统计特征，其中一个热带气旋（“女儿”）在另一个现存的热带气旋（“母亲”）的一生中在其以东形成。据发现，大约30%的所有热带气旋成为母亲，MCE发生相对更频繁地在早，晚的季节比旺季。MCE和没有形成女儿的事件之间大尺度条件的复合差异表明，MCE受到东风垂直切变和气旋性低层水平切变的青睐。这些发现与以下假设大致一致（尽管它们没有证明）：Rossby波辐射是MCE事件中很大一部分的重要机制，并且辐射受线性驻波动力学的支配。
Abstract Best-track and NCEP/NCAR reanalysis data are used to study the statistics of multiple cyclone events (MCEs), in which one tropical cyclone (the ‘daughter’) forms to the east of another extant TC (the ‘mother’) during the mother’s lifetime, in the western north Pacific. It is found that approximately 30% of all tropical cyclones become mothers, and that MCEs occur relatively more frequently in the early and late season than the peak season. Composite differences in large-scale conditions between MCEs and events in which a daughter does not form show that MCEs are favoured by easterly vertical shear and cyclonic low-level horizontal shear. These findings are broadly consistent with (though they do not prove) the hypothesis that Rossby wave radiation is an important mechanism in a significant fraction of MCE events and that the radiation is governed by linear stationary wave dynamics.