DOI: 10.1175/JCLI-D-12-00279.1
Scopus记录号: 2-s2.0-84880283425
论文题名: Southward intertropical convergence zone shifts and implications for an atmospheric bipolar seesaw
作者: Cvijanovic I. ; Langen P.L. ; Kaas E. ; Ditlevsen P.D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 12 起始页码: 4121
结束页码: 4137
语种: 英语
Scopus关键词: Cloud forcing
; Hadley circulation
; Hydrologic cycles
; Paleoclimates
; Teleconnections
; Atmospheric temperature
; Experiments
; Feedback
; Water vapor
; Tropics
; cooling
; Hadley cell
; heat transfer
; hydrological cycle
; intertropical convergence zone
; nonlinearity
; Northern Hemisphere
; oceanic circulation
; paleoclimate
; precipitation (climatology)
; sea surface temperature
; Southern Hemisphere
; surface wind
; teleconnection
; temperature gradient
; warming
; water vapor
; Atlantic Ocean
; Atlantic Ocean (North)
; Southern Ocean
英文摘要: In this study, southward intertropical convergence zone (ITCZ) shifts are investigated in three different scenarios: Northern Hemispheric cooling, Southern Hemispheric warming, and a bipolar seesaw-like forcing that combines the latter two. The experiments demonstrate the mutual effects that northern- and southernhigh- latitude forcings exert on tropical precipitation, suggesting a time-scale-dependent dominance of northern versus southern forcings. In accordance with this, two-phase tropical precipitation shifts are suggested, involving a fast component dominated by the high-northern-latitude forcing and a slower component due to the southern-high-latitude forcing. The results may thus be useful for the future understanding and interpretation of high-resolution tropical paleoprecipitation proxies and their relation to high-latitude records (e.g., ice core data). The experiments also show that Southern Ocean warming has a global impact, affecting both the tropics and northern extratropics, as seen in a southward ITCZ shift and mid- and high-latitude North Atlantic surface temperature and wind changes. In terms of dynamical considerations, the tropical circulation response to high-latitude forcing is found to be nonlinear: the atmospheric heat transport and Hadley cell anomalies differ significantly (in magnitude) when comparing the warming and cooling experiments. These are related to different interhemispheric temperature gradients that are altered mainly by nonlinearities in water vapor response. Decomposition of the top-of-the-atmosphere flux response into atmospheric feedback effects shows the dominance of water vapor and cloud feedbacks in the tropics, with the longwave cloud feedback effect governing the overall cloud response. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51861
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark; Carnegie Institution for Science, Department of Global Ecology, Stanford University, Stanford, CA, United States; Danish Climate Centre, Danish Meteorological Institute, Copenhagen, Denmark
Recommended Citation:
Cvijanovic I.,Langen P.L.,Kaas E.,et al. Southward intertropical convergence zone shifts and implications for an atmospheric bipolar seesaw[J]. Journal of Climate,2013-01-01,26(12)