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DOI	10.1007/s00382-020-05437-6
	Extratropical extended-range precursors near the tropopause preceding persistent strong precipitation in South China: a climatology
	Zhao L.; Liu H.; Hu Y.; Cheng H.; Xiao Z.
发表日期	2020
ISSN	0930-7575
起始页码	3133
结束页码	3150
卷号	55
英文摘要	The pre-summer rainy season (PSRS; April–June) is the period of most frequent strong precipitation in South China (SC). Persistent strong precipitation events (PSPEs) can cause greater loss of life and property than short-lived strong precipitation. This paper investigates extended-range signals near the tropopause preceding two persistent positive climatological intraseasonal oscillations (PPCISOs) in precipitation corresponding to two climatological PSPEs in SC during the PSRS, using the CISO analysis of isentropic potential vorticity (IPV). It is found that precursor signals can be better seen in IPV CISOs than in unfiltered IPV. The first rainfall PPCISO is caused by an eastward propagation of high-IPV CISOs along the dynamical tropopause originating from the Arctic region and west of the Tibetan Plateau. The second is the most persistent (13 days). Its high-IPV CISOs originate over the Arctic region and the tropical monsoon region, respectively, 20 or more days prior to the rainfall CISO peak. The west of the Tibetan Plateau and the northern region of the East Asian westerly jet near the tropopause are two transit points where extratropical high-IPV CISOs strengthen and then change their propagation direction. The southward high-IPV CISOs and the northward positive IPV CISO caused by the monsoon begin to interact about 10 days prior to rainfall peak. Since then, the interaction leads a narrow meridional positive PV channel on the inclined 345 K isentropic surface. A specific CISO pattern, characterized by an elongated high-IPV CISO isolated by three negative IPV CISOs (the South Asian, the Okhotsk and the western Pacific subtropical highs), is responsible for the long duration of the second rainfall PPCISO. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Climatological intraseasonal oscillations; Extended range; Interaction between the stratosphere and the troposphere; Isentropic potential vorticity; Monsoon; Persistent rainfall; Pre-summer rainy season in South China
语种	英语
scopus关键词	climatology; extratropical cyclone; monsoon; oscillation; potential vorticity; precipitation (climatology); rainfall; stratosphere-troposphere interaction; summer; tropopause; Arctic; China; Qinghai-Xizang Plateau
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/145259
作者单位	LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, No. 40 Hua Yan Li, ChaoYang District, Beijing, 100029, China; Department of Aviation Meteorology, Civil Aviation University of China, Tianjin, 300300, China; Guangdong Climate Center, Guangdong Province, Guangzhou, 510080, China; 63729 Troops, Taiyuan, 030027, China
推荐引用方式 GB/T 7714	Zhao L.,Liu H.,Hu Y.,et al. Extratropical extended-range precursors near the tropopause preceding persistent strong precipitation in South China: a climatology[J],2020,55.
APA	Zhao L.,Liu H.,Hu Y.,Cheng H.,&Xiao Z..(2020).Extratropical extended-range precursors near the tropopause preceding persistent strong precipitation in South China: a climatology.Climate Dynamics,55.
MLA	Zhao L.,et al."Extratropical extended-range precursors near the tropopause preceding persistent strong precipitation in South China: a climatology".Climate Dynamics 55(2020).