DOI: 10.1007/s00382-015-2518-0
Scopus记录号: 2-s2.0-84947486042
论文题名: Linear interference and the northern annular mode response to El Niño and climate change
作者: Fletcher C.G. ; Minokhin I.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-11-12 起始页码: 2977
结束页码: 2991
语种: 英语
英文关键词: Climate change
; El Niño
; Linear Interference
; Northern annular mode
; Robustness
; Rossby wave
; Teleconnections
英文摘要: The northern annular mode (NAM) characterizes a significant fraction of wintertime climate variability in the Northern Hemisphere. Understanding the processes governing changes in the NAM on interannual and longer timescales is therefore of critical importance. Previous work reveals a consensus around the negative NAM response to El Niño events (ELN), but considerable disagreement among model projections of the NAM response to climate change (CC), despite the tropical oceans warming in both cases. This work presents numerical simulations with two atmospheric GCMs that reveal robust opposite-signed NAM responses to prescribed sea-surface temperature (SST) anomalies representing ELN (negative NAM) and CC (positive NAM). The primary driver of the sign and amplitude of the NAM response is the linear interference between the planetary waves generated in response to the SST perturbations, and the climatological stationary waves. However, the linear interference framework breaks down in the case involving CC, because the total wave driving of the NAM involves a balance between a strong negative contribution from the eddies related to linear interference, and a strong positive contribution from nonlinear and higher frequency eddies. In addition, the response to CC is less robust in the two models, which may be related to the models’ parameterizations causing differences in the sensitivity to imposed SST anomalies. © 2015, Springer-Verlag Berlin Heidelberg. 资助项目: CFI, Canada Foundation for Innovation
; NSERC, Canada Foundation for Innovation
; UofT, Canada Foundation for Innovation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53902
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography and Environmental Management, University of Waterloo, Waterloo, ON, Canada
Recommended Citation:
Fletcher C.G.,Minokhin I.. Linear interference and the northern annular mode response to El Niño and climate change[J]. Climate Dynamics,2015-01-01,45(2017-11-12)