DOI: 10.1175/JCLI-D-11-00037.1
Scopus记录号: 2-s2.0-84863034162
论文题名: Impact of ENSO on the atmospheric variability over the North Atlantic in late Winter-Role of transient eddies
作者: Li Y. ; Lau N.-C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 1 起始页码: 320
结束页码: 342
语种: 英语
Scopus关键词: Atmospheric circulation
; Eddies
; ENSO
; North Atlantic oscillations
; Storm tracks
; Teleconnections
; Atmospheric pressure
; Climate models
; Climatology
; Storms
; Nickel compounds
; atmosphere-ocean coupling
; atmospheric circulation
; climate effect
; climate forcing
; climate variation
; eddy
; El Nino-Southern Oscillation
; general circulation model
; North Atlantic Oscillation
; sea surface temperature
; storm track
; teleconnection
; warming
; winter
; Atlantic Ocean
; Atlantic Ocean (North)
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Pacific Ocean (North)
; Pacific Ocean (Subtropical)
; Pacific Ocean (Tropical)
英文摘要: The dynamical mechanism for the late-winter teleconnection between El Niño-Southern Oscillation (ENSO) and the North Atlantic Oscillation (NAO) is examined using the output from a 2000-yr integration of a coupled general circulation model (GCM). The coupled model captures many salient features of the observed behavior of both ENSO and NAO, as well as their impact on the surface climate in late winter. Both the observational and model data indicate more occurrences of negative phase of NAO in late winter during El Niño events, and positive NAO in La Niña episodes. The potential role of high-frequency transient eddies in the above teleconnection is diagnosed. During El Niño winters, the intensified transient disturbances along the equatorward-shifted North Pacific storm track extend their influences farther downstream. The eddy-induced negative height tendencies are found to be more coherent and stronger over North Atlantic than that over North Pacific. These negative height tendencies over the North Atlantic are coincident with the southern lobe of NAO, and thus favor more occurrences of negative NAO events. During those El Niño winters with relatively strong SST warming in eastern equatorial Pacific, the eastward extension of eddy activity is reinforced by the enhanced near-surface baroclinicity over the subtropical eastern Pacific. This flow environment supports a stronger linkage between the Pacific and Atlantic storm tracks, and is more conducive to a negative NAO phase. These model results are supported by a parallel analysis of various observational datasets. It is further demonstrated that these transient eddy effects can be reproduced in atmosphericGCMintegrations subjected to ENSO-related SST forcing in the tropical Pacific. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52593
Appears in Collections: 气候变化事实与影响
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作者单位: Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States
Recommended Citation:
Li Y.,Lau N.-C.. Impact of ENSO on the atmospheric variability over the North Atlantic in late Winter-Role of transient eddies[J]. Journal of Climate,2012-01-01,25(1)