DOI: 10.1175/JCLI-D-12-00414.1
Scopus记录号: 2-s2.0-84878159039
论文题名: On the speed of the eddy-driven jet and the width of the hadley cell in the southern hemisphere
作者: Ceppi P. ; Hartmann D.L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 10 起始页码: 3450
结束页码: 3465
语种: 英语
Scopus关键词: Critical latitude
; Eddy momentum flux
; Interannual variability
; Intergovernmental panel on climate changes
; Meridional winds
; Seasonal dependence
; Southern Hemisphere
; Strong correlation
; Climate change
; Clouds
; Data integration
; Digital storage
; Momentum
; Speed
; annual variation
; eddy
; Hadley cell
; Intergovernmental Panel on Climate Change
; jet
; Southern Hemisphere
; spectral analysis
; trend analysis
; twenty first century
英文摘要: A strong correlation between the speed of the eddy-driven jet and the width of the Hadley cell is found to exist in the Southern Hemisphere, both in reanalysis data and in twenty-first-century integrations from the Intergovernmental Panel on Climate Change (IPCC) Fifth Assessment Report multimodel archive. Analysis of the space-time spectra of eddy momentum flux reveals that variations in eddy-driven jet speed are related to changes in the mean phase speed of midlatitude eddies. An increase in eddy phase speeds induces a poleward shift of the critical latitudes and a poleward expansion of the region of subtropical wave breaking. The associated changes in eddy momentum flux convergence are balanced by anomalous meridional winds consistent with a wider Hadley cell. At the same time, faster eddies are also associated with a strengthened poleward eddy momentum flux, sustaining a stronger westerly jet in midlatitudes. The proposed mechanism is consistent with the seasonal dependence of the interannual variability of the Hadley cell width and appears to explain at least part of the projected twenty-first-century trends. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51930
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Ceppi P.,Hartmann D.L.. On the speed of the eddy-driven jet and the width of the hadley cell in the southern hemisphere[J]. Journal of Climate,2013-01-01,26(10)