DOI: 10.1175/JCLI-D-13-00045.1
Scopus记录号: 2-s2.0-84888046328
论文题名: ENSO transition, duration, and amplitude asymmetries: Role of the nonlinear wind stress coupling in a conceptual model
作者: Choi K.-Y. ; Vecchi G.A. ; Wittenberg A.T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 23 起始页码: 9462
结束页码: 9476
语种: 英语
Scopus关键词: Atmosphere-ocean interactions
; Conceptual model
; Control simulation
; ENSO
; Geophysical fluid dynamics laboratories
; Numerical analysis/modeling
; Self-sustained oscillations
; Southern oscillation
; Atmospheric pressure
; Ice control
; Nonlinear feedback
; Oceanography
; Wind stress
; Computer simulation
; air-sea interaction
; amplitude
; atmosphere-ocean coupling
; El Nino-Southern Oscillation
; numerical model
; sea surface temperature
; Southern Oscillation
; wind stress
英文摘要: The El Niño-Southern Oscillation (ENSO) exhibits well-known asymmetries: 1) warm events are stronger than cold events, 2) strong warm events are more likely to be followed by cold events than vice versa, and 3) cold events are more persistent than warm events. Coupled GCM simulations, however, continue to underestimate many of these observed features. To shed light on these asymmetries, the authors begin with a widely used delayed-oscillator conceptual model for ENSO and modify it so that wind stress anomalies depend more strongly on SST anomalies (SSTAs) during warm conditions, as is observed. Then the impact of this nonlinearity on ENSO is explored for three dynamical regimes: self-sustained oscillations, stochastically driven oscillations, and self-sustained oscillations disrupted by stochastic forcings. In all three regimes, the nonlinear air-sea coupling preferentially strengthens the feedbacks (both positive and delayed negative) during the ENSO warm phase-producing El Niños that grow to a larger amplitude and overshoot more rapidly and consistently into the opposite phase, than do the La Niñas. Finally, the modified oscillator is applied to observational records and to control simulations from two global coupled ocean-atmosphere-land-ice models [Geophysical Fluid Dynamics Laboratory Climate Model version 2.1 (GFDL CM2.1) and version 2.5 (GFDL CM2.5)] to elucidate the causes of their differing asymmetries. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51528
Appears in Collections: 气候变化事实与影响
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作者单位: Princeton University, 201 Forrestal Road, Princeton, NJ 08540, United States; Geophysical Fluid Dynamics Laboratory, Princeton University, Princeton, NJ, United States
Recommended Citation:
Choi K.-Y.,Vecchi G.A.,Wittenberg A.T.. ENSO transition, duration, and amplitude asymmetries: Role of the nonlinear wind stress coupling in a conceptual model[J]. Journal of Climate,2013-01-01,26(23)