DOI: 10.1007/s00382-015-2853-1
Scopus记录号: 2-s2.0-84945557763
论文题名: The role of the southward wind shift in both, the seasonal synchronization and duration of ENSO events
作者: Abellán E. ; McGregor S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-01-02 起始页码: 509
结束页码: 527
语种: 英语
英文关键词: Asymmetry
; ENSO
; HCM
; Seasonal synchronization
; Southward wind shift
; Termination
英文摘要: Near the end of the calendar year, when El Niño events typically reach their peak amplitude, there is a southward shift of the zonal wind anomalies, which were centred around the equator prior to the event peak. Previous studies have shown that ENSO’s anomalous wind stresses, including this southward shift, can be reconstructed with the two leading EOFs of wind stresses over the tropical Pacific. Here a hybrid coupled model is developed, featuring a statistical atmosphere that utilises these first two EOFs along with a linear shallow water model ocean, and a stochastic westerly wind burst model. This hybrid coupled model is then used to assess the role of this meridional wind movement on both the seasonal synchronization as well as the duration of the events. It is found that the addition of the southward wind shift in the model leads to a Christmas peak in variance, similar to the observed timing, although with weaker amplitude. We also find that the added meridional wind movement enhances the termination of El Niño events, making the events shorter, while this movement does not appear to play an important role on the duration of La Niña events. Thus, our results strongly suggest that the meridional movement of ENSO zonal wind anomalies is at least partly responsible for seasonal synchronization of ENSO events and the duration asymmetry between the warm (El Niño) and cool (La Niña) phases. © 2015, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53664
Appears in Collections: 过去全球变化的重建
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作者单位: ARC Centre of Excellence for Climate System Science and Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia; School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC, Australia
Recommended Citation:
Abellán E.,McGregor S.. The role of the southward wind shift in both, the seasonal synchronization and duration of ENSO events[J]. Climate Dynamics,2016-01-01,47(2017-01-02)