DOI: 10.1175/JCLI-D-17-0663.1
Scopus记录号: 2-s2.0-85052231322
论文题名: Asymmetric modulation of ENSO teleconnections by the interdecadal Pacific oscillation
作者: Dong B. ; Dai A. ; Vuille M. ; Timm O.E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 18 起始页码: 7337
结束页码: 7361
语种: 英语
英文关键词: Climate models
; Climate variability
; ENSO
; Interdecadal variability
; Pacific decadal oscillation
; Teleconnections
Scopus关键词: Climate change
; Climate models
; Mechanical waves
; Modulation
; Tropics
; Climate variability
; ENSO
; Inter-decadal variability
; Pacific decadal oscillation
; Teleconnections
; Oceanography
英文摘要: Remote influences of ENSO are known to vary with different phases of the interdecadal Pacific oscillation (IPO). Here, observational and reanalysis data from 1920 to 2014 are analyzed to present a global synthesis of the IPO's modulation on ENSOteleconnections, followed by a modeling investigation. Regressions of surface air temperature T, precipitation P, and atmospheric circulations upon IPO and ENSO indices reveal substantial differences between ENSO and IPO teleconnections to regional T and P in terms of spatial pattern, magnitude, and seasonality. The IPO's modulation on ENSOteleconnections asymmetrically varies with both IPO and ENSO phases. For a given ENSO phase, IPO's modulations are not symmetric between its two phases; for a given IPO SST anomaly, its influence depends on whether it is superimposed on El Niño, La Niña, or neutral ENSO. The IPO modulations are linked to the atmospheric response to tropical SST anomalies, manifested in the local Hadley circulation and the local Walker circulation at low latitudes and the Rossby wave train in the extratropics, including the Pacific-North American (PNA) pattern in the Northern Hemisphere.Aset of numerical experiments usingCAM5 forced with different combinations of the IPO- and ENSO-related SSTs further shows that the asymmetric modulation arises from the nonlinear Clausius- Clapeyron relation, so that the atmospheric circulation response to the same IPO-induced SST departure is larger during a warm rather than a cold ENSO phase, and the response to a warm IPO state is larger than that to a cold IPO state. The asymmetry depends primarily on the tropical Pacific mean state and tropical SST anomalies and secondarily on extratropical SST anomalies. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111383
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY, United States; Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Dong B.,Dai A.,Vuille M.,et al. Asymmetric modulation of ENSO teleconnections by the interdecadal Pacific oscillation[J]. Journal of Climate,2018-01-01,31(18)