DOI: 10.1007/s00382-014-2062-3
Scopus记录号: 2-s2.0-84966495212
论文题名: Effectiveness of the Bjerknes stability index in representing ocean dynamics
作者: Graham F.S. ; Brown J.N. ; Langlais C. ; Marsland S.J. ; Wittenberg A.T. ; Holbrook N.J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 2017-09-10 起始页码: 2399
结束页码: 2414
语种: 英语
英文关键词: Bjerknes stability index
; ENSO dynamics
英文摘要: The El Niño-Southern Oscillation (ENSO) is a naturally occurring coupled phenomenon originating in the tropical Pacific Ocean that relies on ocean–atmosphere feedbacks. The Bjerknes stability index (BJ index), derived from the mixed-layer heat budget, aims to quantify the ENSO feedback process in order to explore the linear stability properties of ENSO. More recently, the BJ index has been used for model intercomparisons, particularly for the CMIP3 and CMIP5 models. This study investigates the effectiveness of the BJ index in representing the key ENSO ocean feedbacks—namely the thermocline, zonal advective, and Ekman feedbacks—by evaluating the amplitudes and phases of the BJ index terms against the corresponding heat budget terms from which they were derived. The output from Australian Community Climate and Earth System Simulator Ocean Model (a global ocean/sea ice flux-forced model) is used to calculate the heat budget in the equatorial Pacific. Through the model evaluation process, the robustness of the BJ index terms are tested. We find that the BJ index overestimates the relative importance of the thermocline feedback to the zonal advective feedback when compared with the corresponding terms from the heat budget equation. The assumption of linearity between variables in the BJ index formulation is the primary reason for these differences. Our results imply that a model intercomparison relying on the BJ index to explain ENSO behavior is not necessarily an accurate quantification of dynamical differences between models that are inherently nonlinear. For these reasons, the BJ index may not fully explain underpinning changes in ENSO under global warming scenarios. © 2014, Springer-Verlag Berlin Heidelberg. 资助项目: ARC, Australian Research Council
; CSIRO, Commonwealth Scientific and Industrial Research Organisation
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54650
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Institute for Marine and Antarctic Studies, University of Tasmania, GPO Box 1538, Hobart, TAS, Australia; Wealth from Oceans National Research Flagship, CSIRO Marine and Atmospheric Research, Hobart, Australia; CSIRO Marine and Atmospheric Research, Aspendale, Australia; National Oceanographic and Atmospheric Administration, Geophysical Fluid Dynamics Laboratory, Princeton, United States; ARC Centre of Excellence for Climate System Science, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia
Recommended Citation:
Graham F.S.,Brown J.N.,Langlais C.,et al. Effectiveness of the Bjerknes stability index in representing ocean dynamics[J]. Climate Dynamics,2014-01-01,43(2017-09-10)