DOI: 10.1002/2016GL068851
论文题名: Annular modes and apparent eddy feedbacks in the Southern Hemisphere
作者: Byrne N.J. ; Shepherd T.G. ; Woollings T. ; Plumb R.A.
刊名: Geophysical Research Letters
ISSN: 0094-9106
EISSN: 1944-8837
出版年: 2016
卷: 43, 期: 8 起始页码: 3897
结束页码: 3902
语种: 英语
英文关键词: annular modes
; eddy feedbacks
; lagged correlation analysis
; nonstationary interannual variability
Scopus关键词: Correlation methods
; Momentum
; Annular modes
; Correlation analysis
; Eddy momentum flux
; Interannual variability
; Midlatitude troposphere
; Non-stationarities
; Southern Annular Mode
; Southern Hemisphere
; Feedback
; annual variation
; correlation
; midlatitude environment
; seasonal variation
; Southern Hemisphere
; troposphere
; zonal wind
英文摘要: Lagged correlation analysis is often used to infer intraseasonal dynamical effects but is known to be affected by nonstationarity. We highlight a pronounced quasi 2 year peak in the anomalous zonal wind and eddy momentum flux convergence power spectra in the Southern Hemisphere, which is prima facie evidence for nonstationarity. We then investigate the consequences of this nonstationarity for the Southern Annular Mode and for eddy momentum flux convergence. We argue that positive lagged correlations previously attributed to the existence of an eddy feedback are more plausibly attributed to nonstationary interannual variability external to any potential feedback process in the midlatitude troposphere. The findings have implications for the diagnosis of feedbacks in both models and reanalysis data as well as for understanding the mechanisms underlying variations in the zonal wind. ©2016. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84964344686&doi=10.1002%2f2016GL068851&partnerID=40&md5=2162d3be2c134870cc08a2d48276fe31
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10069
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Byrne N.J.,Shepherd T.G.,Woollings T.,et al. Annular modes and apparent eddy feedbacks in the Southern Hemisphere[J]. Geophysical Research Letters,2016-01-01,43(8).