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标题：Role of Equatorial Wave Transitions in Tropical Cyclogenesis over the Western North Pacific
其他标题：Role of Equatorial Wave Transitions in Tropical Cyclogenesis over the Western North Pacific
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作者：Chen Guang-Hua ; Huang Rong-Hui
期刊名称：Atmospheric and Oceanic Science Letters
印刷版ISSN：1674-2834
电子版ISSN：2376-6123
出版年度：2008
卷号：1
期号：1
页码：64-68
DOI：10.1080/16742834.2008.11446765
出版社：Taylor and Francis Ltd
摘要：Abstract This study associates tropical cyclone (TC) activity over the western North Pacific (WNP) with the equatorial wave transition from an interannual viewpoint, revealing that the tropical cyclogenesis mean location may be modulated by a longitudinal shift in the transition of Mixed Rossby-gravity (MRG) waves to off-equatorial tropical depression (TD) disturbances from year to year. To a large extent, the wave transition is attributable to the monsoon trough in response to the thermal state of the warm pool (WP) over the WNP. During the cold state years in the WP, the basic flow confluence region associated with the monsoon trough penetrates eastward, leading to an eastward shift in the location of the wave transition. Such an environment, in which wave accumulation and energy conversion occur, is favorable for tropical cyclogenesis; as a result, the averaged cyclogenesis location moves eastward. The condition is reserved during the warm years in the WP, resulting in the prominent west-ward-retreating mean TC formation.
关键词：equatorial waves ; tropical cyclogenesis ; western North Pacific