气候变化领域集成服务门户(CCPortal): Pacific mean-state control of atlantic multidecadal oscillation-el niño relationship

CCPortal

DOI	10.1175/JCLI-D-19-0398.1
	Pacific mean-state control of atlantic multidecadal oscillation-el niño relationship
	Dongmin K.I.M.; Lee S.-K.; Lopez H.; Goes M.
发表日期	2020
ISSN	0894-8755
起始页码	4273
结束页码	4291
卷号	33 期号:10
英文摘要	We investigate the potential impacts of the interdecadal Pacific oscillation (IPO) and Atlantic multidecadal oscillation (AMO) on El Niño and the associated atmosphere and ocean dynamics by using the Community Earth System Model-Large Ensemble Simulation (CESM-LENS). The individual effects of IPO and AMO on El Niño frequency and the underlying atmosphere-ocean processes are well reproduced in CESM-LENS and agree with previous studies. However, the sensitivity of El Niño frequency to the AMO is robust mainly during the negative IPO phase and very weak during the positive IPO phase. Further analysis suggests that the atmospheric mean state in the Pacific is much amplified during the negative IPO phase, facilitating the AMO-induced interocean atmospheric teleconnections. More specifically, during the negative IPO phase of the amplified mean state, the positive AMO enhances ascending motion from the northeastern Pacific, which in turn increases subsidence into the southeast Pacific through local anomalous Hadley circulation. The associated low-level easterly wind anomalies in the central equatorial Pacific are also reinforced by amplified upper-level divergence over the Maritime Continent to enhance the negative IPO, which is unfavorable for El Niño occurrence. Conversely, the negative AMO nearly cancels out the suppressing effect of the negative IPO on El Niño occurrence. During the positive IPO phase of the weakened atmospheric mean state, however, the AMO-induced interocean atmospheric teleconnections are much weaker; thus, neither the positive nor the negative AMO has any significant impact on El Niño occurrence. © 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	Earth atmosphere; Atlantic multidecadal oscillations; Atmospheric teleconnections; Earth system model; Ensemble simulation; Hadley circulation; Inter-decadal pacific oscillations; North-eastern Pacific; Suppressing effects; Nickel compounds; air-sea interaction; Atlantic Multidecadal Oscillation; atmospheric dynamics; decadal variation; easterly wave; El Nino; Hadley cell; teleconnection; wind; 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/171319
作者单位	Cooperative Institute for Marine and Atmospheric Studies, University of Miami, NOAA/Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States; NOAA/Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States
推荐引用方式 GB/T 7714	Dongmin K.I.M.,Lee S.-K.,Lopez H.,et al. Pacific mean-state control of atlantic multidecadal oscillation-el niño relationship[J],2020,33(10).
APA	Dongmin K.I.M.,Lee S.-K.,Lopez H.,&Goes M..(2020).Pacific mean-state control of atlantic multidecadal oscillation-el niño relationship.Journal of Climate,33(10).
MLA	Dongmin K.I.M.,et al."Pacific mean-state control of atlantic multidecadal oscillation-el niño relationship".Journal of Climate 33.10(2020).