气候变化领域集成服务门户(CCPortal): Impacts of early/late South China Sea summer monsoon withdrawal on tropical cyclone genesis over the western North Pacific

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DOI	10.1007/s00382-020-05339-7
	Impacts of early/late South China Sea summer monsoon withdrawal on tropical cyclone genesis over the western North Pacific
	Hu P.; Huangfu J.; Chen W.; Huang R.
发表日期	2020
ISSN	0930-7575
起始页码	1507
结束页码	1520
卷号	55
英文摘要	This study reveals a significant in-phase relationship between the South China Sea summer monsoon (SCSSM) withdrawal date and tropical cyclone (TC) genesis over the western North Pacific (WNP). The number of TCs generated over the WNP from mid-September to mid-October is positively correlated with the SCSSM withdrawal date during the period of 1979–2016. The decreased (increased) number of TCs generated during early (late) SCSSM withdrawal years is attributed to both internal atmospheric dynamics and external sea surface temperature (SST) forcing. Through dynamic (Rossby wave response) and thermodynamic (increased moisture) processes, the warm SST anomalies during late withdrawal years over the tropical WNP contribute to maintaining the monsoon trough (MT) in the boreal autumn and moisturizing the mid-level atmosphere, providing a favorable environment for TC genesis. The remaining MT can facilitate the conversion of mean kinetic energy into eddy kinetic energy (EKE) and enhance synoptic-scale waves. In addition, upper-level baroclinic energy conversion also contributes to EKE development. Both barotropic and baroclinic processes favor TC genesis over the WNP. In contrast, colder SSTs during early withdrawal years induce the early withdrawal of the MT, leading to depressed enhancement of the EKE and weakening the northwestward propagation of synoptic-scale waves. Hence, fewer (more) TCs tend to be generated during early (late) withdrawal years. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Monsoon trough; South China Sea; Summer monsoon withdrawal; Tropical cyclone genesis
语种	英语
scopus关键词	atmospheric dynamics; cyclogenesis; monsoon; sea surface temperature; seasonal variation; tropical cyclone; Pacific Ocean; Pacific Ocean (Northwest); South China Sea
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145342
作者单位	Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Hu P.,Huangfu J.,Chen W.,et al. Impacts of early/late South China Sea summer monsoon withdrawal on tropical cyclone genesis over the western North Pacific[J],2020,55.
APA	Hu P.,Huangfu J.,Chen W.,&Huang R..(2020).Impacts of early/late South China Sea summer monsoon withdrawal on tropical cyclone genesis over the western North Pacific.Climate Dynamics,55.
MLA	Hu P.,et al."Impacts of early/late South China Sea summer monsoon withdrawal on tropical cyclone genesis over the western North Pacific".Climate Dynamics 55(2020).