DOI: 10.1002/jgrd.50461
论文题名: The relationship between the ITCZ and the Southern Hemispheric eddy-driven jet
作者: Ceppi P. ; Hwang Y.-T. ; Liu X. ; Frierson D.M.W. ; Hartmann D.L.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 11 起始页码: 5136
结束页码: 5146
语种: 英语
英文关键词: Hadley cells
; ITCZ
; Jet streams
; Teleconnections
Scopus关键词: Climate change
; Eddy momentum flux
; Hadley cells
; Intertropical convergence zone
; ITCZ
; Jet streams
; Northern Hemispheres
; Teleconnections
; Thermal forcing
; Tropics
; climate forcing
; cooling
; eddy
; Hadley cell
; intertropical convergence zone
; jet stream
; momentum
; Northern Hemisphere
; paleoclimate
; Pleistocene
; Southern Hemisphere
; teleconnection
; westerly
英文摘要: We study the effect of a thermal forcing confined to the midlatitudes of one hemisphere on the eddy-driven jet in the opposite hemisphere. We demonstrate the existence of an "interhemispheric teleconnection," whereby warming (cooling) the Northern Hemisphere causes both the intertropical convergence zone (ITCZ) and the Southern Hemispheric midlatitude jet to shift northward (southward). The interhemispheric teleconnection is effected by a change in the asymmetry of the Hadley cells: as the ITCZ shifts away from the Equator, the cross-equatorial Hadley cell intensifies, fluxing more momentum toward the subtropics and sustaining a stronger subtropical jet. Changes in subtropical jet strength, in turn, alter the propagation of extratropical waves into the tropics, affecting eddy momentum fluxes and the eddy-driven westerlies. The relevance of this mechanism is demonstrated in the context of future climate change simulations, where shifts of the ITCZ are significantly related to shifts of the Southern Hemispheric eddy-driven jet in austral winter. The possible relevance of the proposed mechanism to paleoclimates is discussed, particularly with regard to theories of ice age terminations. © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63683
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Ceppi P.,Hwang Y.-T.,Liu X.,et al. The relationship between the ITCZ and the Southern Hemispheric eddy-driven jet[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(11)