气候变化领域集成服务门户(CCPortal): Potential impact of preceding Aleutian low variation on El Niño–Southern oscillation during the following winter

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DOI	10.1175/JCLI-D-19-0717.1
	Potential impact of preceding Aleutian low variation on El Niño–Southern oscillation during the following winter
	Chen S.; Chen W.; Wu R.; Yu B.; Graf H.F.
发表日期	2020
ISSN	0894-8755
起始页码	3061
结束页码	3077
卷号	33 期号:8
英文摘要	The present study reveals a close relation between the interannual variation of Aleutian low intensity (ALI) in March and the subsequent winter El Niño–Southern Oscillation (ENSO). When March ALI is weaker (stronger) than normal, an El Niño (a La Niña)–like sea surface temperature (SST) warming (cooling) tends to appear in the equatorial central-eastern Pacific during the subsequent winter. The physical process linking March ALI to the following winter ENSO is as follows. When March ALI is below normal, a notable atmospheric dipole pattern develops over the North Pacific, with an anticyclonic anomaly over the Aleutian region and a cyclonic anomaly over the subtropical west-central Pacific. The formation of the anomalous cyclone is attributed to feedback of the synoptic-scale eddy-to-mean-flow energy flux and associated vorticity transportation. Specifically, easterly wind anomalies over the midlatitudes related to the weakened ALI are accompanied by a decrease in synoptic-scale eddy activity, which forces an anomalous cyclone to its southern flank. The accompanying westerly wind anomalies over the tropical west-central Pacific induce SST warming in the equatorial central-eastern Pacific during the following summer–autumn via triggering eastward-propagating warm Kelvin waves, which may sustain and develop into an El Niño event during the following winter via positive air–sea feedback. The relation of March ALI with the following winter ENSO is independent of the preceding tropical Pacific SST, the preceding-winter North Pacific Oscillation, and the spring Arctic Oscillation. The results of this analysis may provide an additional source for the prediction of ENSO. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Atmospheric pressure; Oceanography; Storms; Surface waters; Tropics; Anticyclonic anomalies; Arctic Oscillation; Interannual variation; Physical process; Potential impacts; Sea surface temperature (SST); Southern oscillation; Synoptic-scale eddies; Climatology; annual variation; anticyclone; atmospheric circulation; El Nino-Southern Oscillation; prediction; sea surface temperature; seasonal variation; Pacific Ocean
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171358
作者单位	Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; School of Earth Sciences, Zhejiang University, Hangzhou, Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Climate Research Division, Environment and Climate Change Canada, Toronto, ON, Canada; Center for Atmospheric Science, University of Cambridge, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Chen S.,Chen W.,Wu R.,等. Potential impact of preceding Aleutian low variation on El Niño–Southern oscillation during the following winter[J],2020,33(8).
APA	Chen S.,Chen W.,Wu R.,Yu B.,&Graf H.F..(2020).Potential impact of preceding Aleutian low variation on El Niño–Southern oscillation during the following winter.Journal of Climate,33(8).
MLA	Chen S.,et al."Potential impact of preceding Aleutian low variation on El Niño–Southern oscillation during the following winter".Journal of Climate 33.8(2020).