气候变化领域集成服务门户(CCPortal): Factors controlling the interannual variation of 30–60-day boreal summer intraseasonal oscillation over the Asian summer monsoon region

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DOI	10.1007/s00382-018-4216-1
	Factors controlling the interannual variation of 30–60-day boreal summer intraseasonal oscillation over the Asian summer monsoon region
	Li J.; Mao J.
发表日期	2019
ISSN	0930-7575
起始页码	1651
结束页码	1672
卷号	52 期号:2020-03-04
英文摘要	The 30–60-day boreal summer intraseasonal oscillation (BSISO) is a dominant variability of the Asian summer monsoon (ASM), with its intensity being quantified by intraseasonal standard deviations based on OLR data. The spatial and interannual variations of the BSISO intensity are identified via empirical orthogonal function (EOF) analysis for the period 1981–2014. The first EOF mode (EOF1) shows a spatially coherent enhancement or suppression of BSISO activity over the entire ASM region, and the interannual variability of this mode is related to the sea surface temperature anomaly (SSTA) contrast between the central–eastern North Pacific (CNP) and tropical Indian Ocean. In contrast, the second mode (EOF2) exhibits a seesaw pattern between the southeastern equatorial Indian Ocean (EIO) and equatorial western Pacific (EWP), with the interannual fluctuation linked with developing ENSO events. During strong years of EOF1 mode, the enhanced low-level westerlies induced by the summer-mean SSTA contrast between the warmer CNP and cooler tropical Indian Ocean tend to form a wetter moisture background over the eastern EIO, which interacts with intraseasonal low-level convergent flows, leading to stronger equatorial eastward propagation. The intensified easterly shear favors stronger northward propagation over the South Asian and Eastern Asian/Western North Pacific sectors, respectively. Opposite situation is for weak years. For interannual variations of EOF2 mode, the seesaw patterns with enhanced BSISO activity over the southeastern EIO while weakened activity over the EWP mostly occur in the La Niña developing summers, but inverse patterns appear in the El Niño developing summers. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Boreal summer intraseasonal oscillation; Interannual variation; Multi-scale interaction
语种	英语
scopus关键词	air-sea interaction; annual variation; climate oscillation; El Nino-Southern Oscillation; empirical orthogonal function analysis; monsoon; sea surface temperature; seasonal variation; summer; temperature anomaly; Asia; Indian Ocean; Indian Ocean (Equatorial); Indian Ocean (Tropical); 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/146510
作者单位	China University of Geosciences, Wuhan, 430074, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, P. O. Box 9804, Beijing, 100029, China
推荐引用方式 GB/T 7714	Li J.,Mao J.. Factors controlling the interannual variation of 30–60-day boreal summer intraseasonal oscillation over the Asian summer monsoon region[J],2019,52(2020-03-04).
APA	Li J.,&Mao J..(2019).Factors controlling the interannual variation of 30–60-day boreal summer intraseasonal oscillation over the Asian summer monsoon region.Climate Dynamics,52(2020-03-04).
MLA	Li J.,et al."Factors controlling the interannual variation of 30–60-day boreal summer intraseasonal oscillation over the Asian summer monsoon region".Climate Dynamics 52.2020-03-04(2019).