DOI: 10.1175/JCLI-D-16-0923.1
Scopus记录号: 2-s2.0-85025601876
论文题名: Factors determining the asymmetry of ENSO
作者: Liang J. ; Yang X.-Q. ; Sun D.-Z.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 16 起始页码: 6097
结束页码: 6106
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Budget control
; Climate change
; Climatology
; Nickel
; Nonlinear equations
; Nonlinear systems
; Atmosphere-ocean interactions
; Climate variability
; ENSO
; Non-linear heating
; Non-linear model
; Oscillation patterns
; Physical parameters
; Primitive equations
; Climate models
英文摘要: A fundamental aspect of the observed ENSO is the positive asymmetry between its two phases: the strongest El Niño is stronger than the strongest La Niña. The nonlinear term in the equation for the surface ocean heat budget has been theorized as a cause of the asymmetry. This theory is challenged by the diversity of asymmetry among the CMIP5 models: these models all employ primitive equations and thus have the nonlinear term in the heat budget equation for the ocean surface, yet the asymmetry simulated by these models ranges from significantly negative to significantly positive. Here, the authors employ an analytical but nonlinear model-a model that simulates the observed ENSO asymmetry-to show that the nonlinear heating term does not guarantee the oscillation in the system to possess positive asymmetry. Rather, the system can have regimes with negative, zero, and positive asymmetry. The regime in which the system finds itself depends on a multitude of physical parameters. Moreover, the range of certain physical parameters for the system to fall in the regime with positive asymmetry in the oscillation is rather narrow, underscoring the difficulty of simulating the observed ENSO asymmetry by CMIP5 models. Moreover, stronger positive asymmetry is found to be associated with a more complicated oscillation pattern: the two adjacent strongest warm events are spaced farther apart and more small events occur in between. These results deepen the understanding of factors that are behind the asymmetry of ENSO and offer paths to take to improve model-simulated ENSO asymmetry. © 2017 American Meteorological Society. 资助项目: NSF, National Science Foundation
; NSF, National Science Foundation
; NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
; NOAA, National Oceanic and Atmospheric Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48749
Appears in Collections: 气候减缓与适应 气候变化与战略
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作者单位: China Meteorological Administration-Nanjing University, Joint Laboratory for Climate Prediction Studies, School of Atmospheric Sciences, Nanjing, China; Jiangsu Collaborative Innovation Center of Climate Change, Nanjing University, Nanjing, China; Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, United States
Recommended Citation:
Liang J.,Yang X.-Q.,Sun D.-Z.. Factors determining the asymmetry of ENSO[J]. Journal of Climate,2017-01-01,30(16)