DOI: 10.1175/JCLI-D-14-00185.1
Scopus记录号: 2-s2.0-84920272383
论文题名: On the extratropical influence of variations of the upper-tropospheric equatorial zonal-mean zonal wind during boreal winter
作者: Gollan G. ; Greatbatch R.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 1 起始页码: 168
结束页码: 185
语种: 英语
Scopus关键词: Atmospheric pressure
; Climatology
; Mechanical waves
; Orthogonal functions
; Regression analysis
; Time series
; Tropics
; Troposphere
; Madden-Julian oscillation
; Quasi-biennial oscillation
; Rossby wave
; Seasonal forecasting
; Stationary waves
; Teleconnections
; Weather forecasting
; extratropical environment
; Madden-Julian oscillation
; quasi-biennial oscillation
; Rossby wave
; standing wave
; teleconnection
; troposphere
; zonal wind
; Atlantic Ocean
; Atlantic Ocean (North)
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: Variations in the global tropospheric zonal-mean zonal wind [U] during boreal winter are investigated using rotated empirical orthogonal functions applied to monthly means. The first two modes correspond to the northern and southern annular mode and modes 3 and 4 represent variability in the tropics. One is related to El Niño-Southern Oscillation and the other has variability that is highly correlated with the time series of [U] at 150 hPa between 5°N and 5°S [U150]E and is related to activity of the Madden-Julian oscillation. The extratropical response to [U150]E is investigated using linear regressions of 500-hPa geopotential height onto the [U150]E time series. Use is made of reanalysis data and of the ensemble mean output from a relaxation experiment using the European Centre for Medium-Range Weather Forecasts model in which the tropical atmosphere is relaxed toward reanalysis data. The regression analysis reveals that a shift of the Aleutian low and a wave train across the North Atlantic are associated with [U150]E. It is found that the subtropical waveguides and the link between the North Pacific and North Atlantic are stronger during the easterly phase of [U150]E. The wave train over the North Atlantic is associated with Rossby wave sources over the subtropical North Pacific and North America. Finally, it is shown that a linear combination of both [U150]E and the quasi-biennial oscillation in the lower stratosphere can explain the circulation anomalies of the anomalously cold European winter of 1962/63 when both were in an extreme easterly phase. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50574
Appears in Collections: 气候变化事实与影响
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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Recommended Citation:
Gollan G.,Greatbatch R.J.. On the extratropical influence of variations of the upper-tropospheric equatorial zonal-mean zonal wind during boreal winter[J]. Journal of Climate,2015-01-01,28(1)