DOI: 10.1007/s00382-013-1695-y
Scopus记录号: 2-s2.0-84875716155
论文题名: Impact of projected SST changes on summer rainfall in southeastern South America
作者: Junquas C. ; Vera C.S. ; Li L. ; Le Treut H.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-07-08 起始页码: 1569
结束页码: 1589
语种: 英语
英文关键词: Climate change
; Rainfall changes
; Sea surface temperature projections
; South America climate
; Two-way nesting system
英文摘要: Recent studies have shown that global warming and associated sea-surface temperature (SST) changes may trigger an important rainfall increase in southeastern South America (SESA) during the austral summer (December-January-February, DJF). The goal of this paper is to provide some insight into processes which may link global and SESA changes. For this purpose, a "two-way nesting" system coupling interactively the regional and global versions of the LMDZ4 atmospheric model is used to study the response to prescribed SST changes. The regional model is a variable-grid version of the global model, with a zoom focused over South America. An ensemble of simulations forced by distinct patterns of DJF SST changes has been carried out using a decomposition of full SST changes into their longitudinal and latitudinal components. The full SST changes are based on projections for the end of the twenty-first century from a multi-model ensemble of WCRP/CMIP3. Results confirm the presence of a major rainfall dipole structure, characterized by an increase in SESA and a decrease in the South Atlantic Convergence Zone region. Rainfall changes found in the WCRP/CMIP3 models are largely explained as a response of this dipole structure to the zonally-asymmetric (or longitudinal) component of SST changes. The rainfall response to the zonal-mean (or latitudinal) SST changes (including the global warming signal itself) shows an opposite contribution. The processes explaining the role of zonally-asymmetric SST changes involve remote effects of SST warming over the equatorial Indian and Pacific oceans inducing an atmospheric wave-train extended across the South Pacific into South America. © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54918
Appears in Collections: 过去全球变化的重建
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作者单位: Laboratoire de Météorologie Dynamique, Institut Pierre Simon Laplace, UPMC/CNRS, Paris, France; Centro de Investigaciones Del Mar y la Atmosfera (CIMA/CONICET-UBA), DCAO/FCEN, UMI IFAECI/CNRS, Buenos Aires, Argentina
Recommended Citation:
Junquas C.,Vera C.S.,Li L.,et al. Impact of projected SST changes on summer rainfall in southeastern South America[J]. Climate Dynamics,2013-01-01,40(2017-07-08)