DOI: 10.1175/JCLI-D-14-00716.1
Scopus记录号: 2-s2.0-84949944941
论文题名: El Niño-Southern oscillation sea level pressure anomalies in the Western Pacific: Why are they there?
作者: Ji X. ; Neelin J.D. ; Mechoso C.R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 22 起始页码: 8860
结束页码: 8872
语种: 英语
Scopus关键词: Atmospheric pressure
; Climatology
; Mechanical waves
; Nickel
; Oceanography
; Plasma diagnostics
; Sea level
; Wind effects
; ENSO
; Numerical analysis/modeling
; Rossby wave
; Southern oscillation
; Teleconnections
; Tropics
英文摘要: Although sea level pressure (SLP) anomalies in the western Pacific have long been recognized as an integral part of the classic Southern Oscillation pattern associated with El Niño-Southern Oscillation (ENSO), there is an unresolved question regarding the dynamics that maintain these anomalies. Traditional studies of the ENSO response in the tropics assume a single deep baroclinic mode associated with the tropospheric temperature anomalies. However, the SLP anomalies in the western Pacific are spatially separated from the baroclinic signal in the NCEP-NCAR reanalysis, CMIP5 models, and an intermediate complexity model [a quasi-equilibrium tropical circulation model (QTCM)]. Separation of ENSO SLP anomalies in the tropical Pacific into baroclinic and barotropic components indicates that the barotropic component contributes throughout the tropics and constitutes the primary contribution in the western Pacific. To demonstrate the roles of baroclinic and barotropic modes in ENSO teleconnections within the tropics, a series of QTCM experiments is performed, where anomalies in the interactions between baroclinic and barotropic modes are suppressed over increasingly wider latitudinal bands in the tropical Pacific. If this suppression is done in the 15°N-15°S band, the pressure signals in the western Pacific are only partly removed, whereas if it is done in the 30°N-30°S band, the anomalies in the western Pacific are almost entirely removed. This suggests the following pathway: interactions with SST anomalies create the baroclinic response in the central and eastern Pacific, but baroclinic-barotropic interactions, arising substantially in the subtropical Pacific, generate a barotropic response that yields the SLP anomalies in the western Pacific. © 2015 American Meteorological Society. 资助项目: NSF, National Science Foundation
; NSF, National Science Foundation
; NOAA, National Science Foundation
; NOAA, National Science Foundation
; UC, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50741
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA, United States
Recommended Citation:
Ji X.,Neelin J.D.,Mechoso C.R.. El Niño-Southern oscillation sea level pressure anomalies in the Western Pacific: Why are they there?[J]. Journal of Climate,2015-01-01,28(22)