DOI: 10.1002/grl.50136
论文题名: Meridional movement of wind anomalies during ENSO events and their role in event termination
作者: McGregor S. ; Ramesh N. ; Spence P. ; England M.H. ; McPhaden M.J. ; Santoso A.
刊名: Geophysical Research Letters
ISSN: 0094-9296
EISSN: 1944-9027
出版年: 2013
卷: 40, 期: 4 起始页码: 749
结束页码: 754
语种: 英语
英文关键词: El Niño
; ENSO
; La Niña
; termination
Scopus关键词: Earth sciences
; Geophysics
; Eastern pacific
; ENSO
; Equatorial heat content
; Meridional winds
; Observational analysis
; Product selection
; termination
; Wind anomalies
; Atmospheric pressure
; El Nino-Southern Oscillation
; meridional circulation
; nonlinearity
; wind profile
; winter
; zonal wind
; Pacific Ocean
; Pacific Ocean (Central)
; Pacific Ocean (East)
英文摘要: Observational analysis has shown that when El Niño-Southern Oscillation (ENSO) events typically reach their peak amplitude in boreal winter, the associated zonal wind anomalies abruptly shift southward so that the maximum anomalous zonal wind is located around 5°-7°S. Here, an analysis utilizing multiple wind products identifies a clear ENSO phase nonlinearity in the extent of this meridional wind movement and its dynamically linked changes in equatorial heat content. It is shown that the meridional wind movement and its discharging effect increase with increasing El Niño amplitude, while both remain relatively small regardless of La Niña amplitude. This result implies that asymmetries in the extent of the meridional wind shift may contribute to the observed asymmetry in the duration of El Niño and La Niña events. We also evaluate the result sensitivities to wind product selection and discuss Eastern Pacific (EP) and Central Pacific (CP) El Niño event differences. Key Points The meridional shift plays a prominent role in strong El Nino event termination The magnitude of this meridional shift is related to El Nino event intensity ENSO phase asymmetries in the wind shift play a role in the duration asymmetry ©2013. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878176319&doi=10.1002%2fgrl.50136&partnerID=40&md5=1508b1576893e40c955617e85e7fa571
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6560
Appears in Collections: 气候减缓与适应
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作者单位: Climate Change Research Centre, University of New South Wales, Sydney, NSW 2052, Australia
Recommended Citation:
McGregor S.,Ramesh N.,Spence P.,et al. Meridional movement of wind anomalies during ENSO events and their role in event termination[J]. Geophysical Research Letters,2013-01-01,40(4).