气候变化领域集成服务门户(CCPortal): A tropical cyclone removal technique based on potential vorticity inversion to better quantify tropical cyclone contribution to the background circulation

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DOI	10.1007/s00382-020-05165-x
	A tropical cyclone removal technique based on potential vorticity inversion to better quantify tropical cyclone contribution to the background circulation
	Arakane S.; Hsu H.-H.
发表日期	2020
ISSN	0930-7575
起始页码	3201
结束页码	3226
卷号	54
英文摘要	An effective way of investigating the effects of tropical cyclones (TCs) on different spatial/temporal-scale environmental fields is to contrast the original circulation with the circulation from which the TCs have been removed. Although dynamical balance is required for analyzing TC contributions, the dynamic balance of TC-removed fields obtained by the existing TC removal method (which is widely used in the TC bogus procedure) is often ignored. In this paper, a TC removal method incorporating the potential vorticity (PV) inversion technique is proposed and its application to climate study is demonstrated. This method objectively detects the TCs’ positive PV disturbance, which is strong with a deep structure and overwhelmingly dominates the relatively weak and thin negative PV disturbance. The TC-removed field is well-balanced due to the dynamic balance consideration in the PV inversion framework. This approach isolates TC vortices, which are stronger and have a wider range of impacts compared with the TC components derived by the existing removal methods. The TC-removed fields obtained by the existing and the proposed methods are profoundly different, especially in dynamic balance. The TC contribution to intraseasonal variance and seasonal mean circulation in the tropical western North Pacific is examined. The existence of TCs enhances the amplitude and propagation of intraseasonal oscillation and strengthens the seasonal mean circulations such as the low-level monsoon trough and upper-level anticyclone in the region. Whereas the existing and the proposed TC removal techniques yield consistent results, the proposed technique yields larger TC contributions to the seasonal-mean circulation and the amplitude and northward propagation tendency of intraseasonal oscillation. © 2020, The Author(s).
语种	英语
scopus关键词	anticyclone; atmospheric circulation; atmospheric dynamics; atmospheric structure; monsoon; potential vorticity; spatial variation; temporal variation; tropical cyclone; Pacific Ocean; Pacific Ocean (North)
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/145553
作者单位	Research Center for Environmental Changes, Academia Sinica, Taipei, 115, Taiwan; Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, 277-8568, Japan
推荐引用方式 GB/T 7714	Arakane S.,Hsu H.-H.. A tropical cyclone removal technique based on potential vorticity inversion to better quantify tropical cyclone contribution to the background circulation[J],2020,54.
APA	Arakane S.,&Hsu H.-H..(2020).A tropical cyclone removal technique based on potential vorticity inversion to better quantify tropical cyclone contribution to the background circulation.Climate Dynamics,54.
MLA	Arakane S.,et al."A tropical cyclone removal technique based on potential vorticity inversion to better quantify tropical cyclone contribution to the background circulation".Climate Dynamics 54(2020).