DOI: 10.1175/JCLI-D-13-00757.1
Scopus记录号: 2-s2.0-84905915960
论文题名: Analysis of the nonlinearity of El Niño-Southern Oscillation teleconnections
作者: Frauen C. ; Dommenget D. ; Tyrrell N. ; Rezny M. ; Wales S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 16 起始页码: 6225
结束页码: 6244
语种: 英语
Scopus关键词: Sea level
; Atmospheric general circulation models
; Non-linear response
; Regional differences
; Sea level pressure
; Sea surface temperature (SST)
; Single components
; Spatial patterns
; Teleconnection patterns
; Atmospheric pressure
; air-sea interaction
; atmospheric general circulation model
; El Nino-Southern Oscillation
; nonlinearity
; numerical model
; precipitation (climatology)
; sea level pressure
; sea surface temperature
; teleconnection
; tropical region
; Pacific Ocean
; Pacific Ocean (Central)
英文摘要: El Niño-Southern Oscillation (ENSO) has significant variations and nonlinearities in its pattern and strength. ENSO events vary in their position along the equator, with somelocated in the central Pacific (CP) and others in the east Pacific (EP). To study how these variations are reflected in global ENSO teleconnections, both observations and idealized atmospheric general circulation model (AGCM) simulations are analyzed. Clear nonlinearities exist in observed teleconnections of sea level pressure (SLP) and precipitation. However, it is difficult to distinguish if these are caused by the different signs, strengths, or spatial patterns of events (strong El Niño events mostly being EP events and strong La Niña events mostly being CP events) or by combinations of these. Therefore, sensitivity experiments are performed with anAGCMforced with idealized EP and CP ENSO sea surface temperature (SST) patterns with varying signs and strengths. The response is generally stronger for warm events than for cold events and the teleconnection patterns vary with changing SST anomaly patterns. EP events show stronger nonlinearities than CP events. The nonlinear responses to ENSO events can be explained as a combination of nonlinear responses to a linear ENSO(fixed pattern but varying signs and strengths) and a linear response to a nonlinear ENSO(varying patterns).Any observed event is a combination of these aspects.While inmost tropical regions these add up, leading to stronger nonlinear responses than expected from the single components, in some regions they cancel each other, resulting in little overall nonlinearity. This leads to strong regional differences in ENSO teleconnections. © 2014 American Meteorological Society. 资助项目: ARC, Australian Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51098
Appears in Collections: 气候变化事实与影响
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作者单位: School of Mathematical Sciences, Monash University, Clayton, VIC, Australia; ARC Centre of Excellence for Climate System Science, Monash University, Clayton, VIC, Australia; Met Office, Exeter, United Kingdom; University of Melbourne, Melbourne, VIC, Australia
Recommended Citation:
Frauen C.,Dommenget D.,Tyrrell N.,et al. Analysis of the nonlinearity of El Niño-Southern Oscillation teleconnections[J]. Journal of Climate,2014-01-01,27(16)