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DOI	10.1007/s00382-020-05340-0
	The combined influence of ENSO and PDO on the spring UTLS ozone variability in South America
	Gamelin B.L.; Carvalho L.M.V.; Kayano M.
发表日期	2020
ISSN	0930-7575
起始页码	1539
结束页码	1562
卷号	55
英文摘要	Ozone in the upper troposphere–lower stratosphere (UTLS) is primarily regulated by tropospheric dynamics. Understanding mechanisms driving ozone variability at the UTLS is crucial to evaluate the transport of mass to and from the lower stratosphere. The El Niño-Southern Oscillation (ENSO) is the primary coupled mode acting on interannual timescales modulating tropospheric circulation worldwide. ENSO teleconnections can depend on the phases of the Pacific Decadal Oscillation (PDO) and on the characteristics of the warming over central and eastern tropical Pacific. This study investigates the role of ENSO on UTLS ozone variability with focus on South America and examines patterns of teleconnections in the two recent warm (1980–1997) and cool (1998–2012) PDO phases. The dominant mode of ozone variability is identified by applying a principal component analysis (PCA) to modern-era retrospective analysis for research and applications, Version 2 (MERRA-2) ozone data from September–November (SON). SON is the season with the largest UTLS ozone variance over South America. The first mode resembles a Rossby wave train across South America with spatial patterns dependent on PDO phase. We show that the ENSO teleconnections and respective influences on SON UTLS ozone are stronger during the cool PDO when ENSO and PDO are mostly in phase. Additionally, the strength of the ENSO teleconnection appears to depend on patterns of SST anomalies over tropical Pacific. The decadal variability in the ENSO-PDO relationships and teleconnections with the Southern Hemisphere resulted in a shift in upper tropospheric circulation in tropical and subtropical regions of South America. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	ENSO; ENSO teleconnections; PDO; Rossby wave trains; South America; Upper troposphere–lower stratosphere ozone
语种	英语
scopus关键词	atmospheric chemistry; decadal variation; El Nino-Southern Oscillation; ozone; Pacific Decadal Oscillation; Rossby wave; sea surface temperature; Southern Hemisphere; spatial variation; spring (season); stratosphere-troposphere interaction; teleconnection; Pacific Ocean; Pacific Ocean (Tropical); South America
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/145344
作者单位	Department of Geography, University of California, Santa Barbara, CA 93106, United States; Earth Research Institute, University of California, Santa Barbara, United States; Instituto Nacional de Pesquisas Espaciais, Centro de Previsão de Tempo E Estudos Climáticos, São José dos Campos, Brazil
推荐引用方式 GB/T 7714	Gamelin B.L.,Carvalho L.M.V.,Kayano M.. The combined influence of ENSO and PDO on the spring UTLS ozone variability in South America[J],2020,55.
APA	Gamelin B.L.,Carvalho L.M.V.,&Kayano M..(2020).The combined influence of ENSO and PDO on the spring UTLS ozone variability in South America.Climate Dynamics,55.
MLA	Gamelin B.L.,et al."The combined influence of ENSO and PDO on the spring UTLS ozone variability in South America".Climate Dynamics 55(2020).