气候变化领域集成服务门户(CCPortal): Modulation of the Relationship between ENSO and Its Combination Mode by the Atlantic Multidecadal Oscillation

CCPortal

DOI	10.1175/JCLI-D-19-0740.1
	Modulation of the Relationship between ENSO and Its Combination Mode by the Atlantic Multidecadal Oscillation
	Geng X.; Zhang W.; Jin F.-F.; Stuecker M.F.; Levine A.F.Z.
发表日期	2020
ISSN	0894-8755
起始页码	4679
结束页码	4695
卷号	33 期号:11
英文摘要	Recent studies demonstrated the existence of a conspicuous atmospheric combination mode (C-mode) originating from nonlinear interactions between El Ninõ-Southern Oscillation (ENSO) and the Pacific warm pool annual cycle (AC). Here we find that the C-mode exhibits prominent decadal amplitude variations during the ENSO decaying boreal spring season. It is revealed that the Atlantic multidecadal oscillation (AMO) can largely explain this waxing and waning in amplitude. A robust positive correlation between ENSO and the C-mode is detected during a negative AMO phase but not during a positive phase. Similar results can also be found in the relationship of ENSO with 1) the western North Pacific (WNP) anticyclone and 2) spring precipitation over southern China, both of which are closely associated with the C-mode.We suggest that ENSO property changes due to an AMO modulation play a crucial role in determining these decadal shifts. During a positive AMO phase, ENSO events are distinctly weaker than those in an AMO negative phase. In addition, El Ninõ events concurrent with a positive AMO phase tend to exhibit a westward-shifted sea surface temperature (SST) anomaly pattern. These SST characteristics during the positive AMO phase are both not conducive to the development of the meridionally asymmetric C-mode atmospheric circulation pattern and thus reduce the ENSO/C-mode correlation on decadal time scales. These observations can be realistically reproduced by a coupled general circulation model (CGCM) experiment in which North Atlantic SSTs are nudged to reproduce a 50-yr sinusoidally varying AMO evolution. Our conclusion carries important implications for understanding seasonally modulated ENSO dynamics and multiscale climate impacts over East Asia. © 2020 American Meteorological Society. All rights reserved.
英文关键词	Atmospheric pressure; Modulation; Oceanography; Surface waters; Atlantic multidecadal oscillations; Atmospheric circulation patterns; Coupled general circulation models; Nonlinear interactions; Positive correlations; Sea surface temperature anomalies; Southern oscillation; Western North Pacific; Climatology; amplitude; Atlantic Multidecadal Oscillation; climate effect; correlation; decadal variation; El Nino-Southern Oscillation; sea surface temperature; Pacific Ocean; Pacific Ocean (North)
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/171271
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education, Nanjing University of Information Science and Technology, CIC-FEMD/ILCEC, Nanjing, China; Department of Atmospheric Sciences, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu, HI, United States; 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, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Geng X.,Zhang W.,Jin F.-F.,et al. Modulation of the Relationship between ENSO and Its Combination Mode by the Atlantic Multidecadal Oscillation[J],2020,33(11).
APA	Geng X.,Zhang W.,Jin F.-F.,Stuecker M.F.,&Levine A.F.Z..(2020).Modulation of the Relationship between ENSO and Its Combination Mode by the Atlantic Multidecadal Oscillation.Journal of Climate,33(11).
MLA	Geng X.,et al."Modulation of the Relationship between ENSO and Its Combination Mode by the Atlantic Multidecadal Oscillation".Journal of Climate 33.11(2020).