DOI: 10.1007/s00382-014-2126-4
Scopus记录号: 2-s2.0-84897122103
论文题名: The impact of westerly wind bursts and ocean initial state on the development, and diversity of El Niño events
作者: Fedorov A.V. ; Hu S. ; Lengaigne M. ; Guilyardi E.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期: 2017-05-06 起始页码: 1381
结束页码: 1401
语种: 英语
英文关键词: Climate models
; El Niño dynamics
; El Niño flavors
; Westerly wind bursts (WWB)
英文摘要: Westerly wind bursts (WWBs) that occur in the western tropical Pacific are believed to play an important role in the development of El Niño events. Here, following the study of Lengaigne et al. (Clim Dyn 23(6):601–620, 2004), we conduct numerical simulations in which we reexamine the response of the climate system to an observed wind burst added to a coupled general circulation model. Two sets of twin ensemble experiments are conducted (each set has control and perturbed experiments). In the first set, the initial ocean heat content of the system is higher than the model climatology (recharged), while in the second set it is nearly normal (neutral). For the recharged state, in the absence of WWBs, a moderate El Niño with a maximum warming in the central Pacific (CP) develops in about a year. In contrast, for the neutral state, there develops a weak La Niña. However, when the WWB is imposed, the situation dramatically changes: the recharged state slides into an El Niño with a maximum warming in the eastern Pacific, while the neutral set produces a weak CP El Niño instead of previous La Niña conditions. The different response of the system to the exact same perturbations is controlled by the initial state of the ocean and the subsequent ocean–atmosphere interactions involving the interplay between the eastward shift of the warm pool and the warming of the eastern equatorial Pacific. Consequently, the observed diversity of El Niño, including the occurrence of extreme events, may depend on stochastic atmospheric processes, modulating El Niño properties within a broad continuum. © 2014, Springer-Verlag Berlin Heidelberg. 资助项目: ANR, Agence Nationale de la Recherche
; NSF, National Science Foundation
; DOE, U.S. Department of Energy
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54147
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology and Geophysics, Yale University, New Haven, CT, United States; IPSL/LOCEAN, Sorbonne Universités (UPMC-Paris 6, CNRS, IRD, MNHN), Paris, France; NCAS Climate, Meteorology Department, University of Reading, Reading, United Kingdom
Recommended Citation:
Fedorov A.V.,Hu S.,Lengaigne M.,et al. The impact of westerly wind bursts and ocean initial state on the development, and diversity of El Niño events[J]. Climate Dynamics,2015-01-01,44(2017-05-06)