气候变化领域集成服务门户(CCPortal): Decadal change of combination mode spatiotemporal characteristics due to an ENSO regime shift

CCPortal

DOI	10.1175/JCLI-D-19-0822.1
	Decadal change of combination mode spatiotemporal characteristics due to an ENSO regime shift
	Jiang F.; Zhang W.; Stuecker M.F.; Jin F.-F.
发表日期	2020
ISSN	0894-8755
起始页码	5239
结束页码	5251
卷号	33 期号:12
英文摘要	Previous studies have shown that nonlinear atmospheric interactions between ENSO and the warm pool annual cycle generates a combination mode (C-mode), which is responsible for the termination of strong El Niño events and the development of the anomalous anticyclone over the western North Pacific (WNP). However, the C-mode has experienced a remarkable decadal change in its characteristics around the early 2000s. The C-mode in both pre- and post-2000 exhibits its characteristic anomalous atmospheric circulation meridional asymmetry but with somewhat different spatial structures and time scales. During 1979–99, the C-mode pattern featured prominent westerly surface wind anomalies in the southeastern tropical Pacific and anticyclonic anomalies over the WNP. In contrast, the C-mode-associated westerly anomalies were shifted farther westward to the central Pacific and the WNP anticyclone was farther westward extended and weaker after 2000. These different C-mode patterns were accompanied by distinct climate impacts over the Indo-Pacific region. The decadal differences of the C-mode are tightly connected with the ENSO regime shift around 2000; that is, the occurrence of central Pacific (CP) El Niño events with quasi-biennial and decadal periodicities increased while the occurrence of eastern Pacific (EP) El Niño events with quasi-quadrennial periodicity decreased. The associated near-annual combination tone periodicities of the C-mode also changed in accordance with these changes in the dominant ENSO frequency between the two time periods. Numerical model experiments further confirm the impacts of the ENSO regime shift on the C-mode characteristics. These results have important implications for understanding the C-mode dynamics and improving predictions of its climate impacts. © 2020 American Meteorological Society.
英文关键词	Nickel compounds; Anticyclonic anomalies; Atmospheric circulation; Atmospheric interaction; Mode characteristics; Model experiments; Spatiotemporal characteristics; Surface wind anomalies; Western North Pacific; Climatology; air-sea interaction; atmospheric circulation; decadal variation; El Nino-Southern Oscillation; periodicity; spatiotemporal analysis; surface wind; westerly; Pacific Ocean; Pacific Ocean (Central); Pacific Ocean (East); Pacific Ocean (North); Pacific Ocean (Tropical)
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/171295
作者单位	Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing, China; Department of Oceanography, and International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawai‘i at Manoa, Honolulu, HI, United States; Department of Atmospheric Sciences, School of Ocean and Earth Science and Technology, University of Hawai‘i at Manoa, Honolulu, HI, United States
推荐引用方式 GB/T 7714	Jiang F.,Zhang W.,Stuecker M.F.,et al. Decadal change of combination mode spatiotemporal characteristics due to an ENSO regime shift[J],2020,33(12).
APA	Jiang F.,Zhang W.,Stuecker M.F.,&Jin F.-F..(2020).Decadal change of combination mode spatiotemporal characteristics due to an ENSO regime shift.Journal of Climate,33(12).
MLA	Jiang F.,et al."Decadal change of combination mode spatiotemporal characteristics due to an ENSO regime shift".Journal of Climate 33.12(2020).