气候变化领域集成服务门户(CCPortal): Recent weakening of the linkage between the spring Arctic Oscillation and the following winter El Niño-Southern Oscillation

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DOI	10.1007/s00382-019-04988-7
	Recent weakening of the linkage between the spring Arctic Oscillation and the following winter El Niño-Southern Oscillation
	Chen S.; Wu R.; Chen W.; Yu B.
发表日期	2020
ISSN	0930-7575
起始页码	53
结束页码	67
卷号	54 期号:2020-01-02
英文摘要	Previous studies indicated that the spring Arctic Oscillation (AO) is an important extratropical forcing of the occurrence of El Niño-Southern Oscillation (ENSO) in the following winter. This study reveals an interdecadal weakening in the spring AO-winter ENSO connection around the early-1990s and investigates the reason of this change. Before the early-1990s, in association with the positive phase of the spring AO, an anomalous anticyclone appears over the mid-latitude North Pacific, accompanied by an anomalous cyclone over the subtropical North Pacific that is supported by the wave-mean flow interaction. Correspondingly, the sea surface temperature (SST) warming and its associated positive precipitation anomalies develop over the subtropical North Pacific, which play a crucial role in forming and maintaining the westerly wind anomalies over the tropical western Pacific (TWP) from spring to the following summer. The TWP westerly wind anomalies would induce the El Niño event in the following winter. After the early-1990s, by contrast, the Pacific component of the circulation anomalies related to the spring AO is weak and shifts northward. This is followed by weak anomalies of SST and precipitation over the subtropical North Pacific, as well as weak TWP westerly wind anomalies from spring to the following summer. Hence, the spring AO-winter ENSO connection is weak after the early-1990s. The change of the spring AO associated circulation anomalies over the North Pacific around the early-1990s tends to be related to the interdecadal change in the intensity of the Aleutian Low. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Early-1990s; ENSO; Interdecadal change; Spring Arctic Oscillation
语种	英语
scopus关键词	anticyclone; Arctic Oscillation; decadal variation; El Nino-Southern Oscillation; extratropical environment; midlatitude environment; precipitation assessment; sea surface temperature; spring (season); westerly; Pacific Ocean; Pacific Ocean (North); Pacific Ocean (West)
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/145779
作者单位	Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; Climate Research Division, Environment and Climate Change Canada, Toronto, ON, Canada; School of Earth Sciences, Zhejiang University, Hangzhou, China
推荐引用方式 GB/T 7714	Chen S.,Wu R.,Chen W.,et al. Recent weakening of the linkage between the spring Arctic Oscillation and the following winter El Niño-Southern Oscillation[J],2020,54(2020-01-02).
APA	Chen S.,Wu R.,Chen W.,&Yu B..(2020).Recent weakening of the linkage between the spring Arctic Oscillation and the following winter El Niño-Southern Oscillation.Climate Dynamics,54(2020-01-02).
MLA	Chen S.,et al."Recent weakening of the linkage between the spring Arctic Oscillation and the following winter El Niño-Southern Oscillation".Climate Dynamics 54.2020-01-02(2020).