DOI: 10.1007/s00382-016-3081-z
Scopus记录号: 2-s2.0-84961199197
论文题名: Accelerated greenhouse gases versus slow insolation forcing induced climate changes in southern South America since the Mid-Holocene
作者: Berman A.L. ; Silvestri G.E. ; Rojas M. ; Tonello M.S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-01-02 起始页码: 387
结束页码: 404
语种: 英语
英文关键词: Anthropogenic forcing
; Mid-Holocene
; natural forcing
; Patagonia
; PMIP3 models
; South America
英文摘要: This paper is a pioneering analysis of past climates in southern South America combining multiproxy reconstructions and the state-of-the-art CMIP5/PMIP3 paleoclimatic models to investigate the time evolution of regional climatic conditions from the Mid-Holocene (MH) to the present. This analysis allows a comparison between the impact of the long term climate variations associated with insolation changes and the more recent effects of anthropogenic forcing on the region. The PMIP3 multimodel experiments suggest that changes in precipitation over almost all southern South America between MH and pre-industrial (PI) times due to insolation variations are significantly larger than those between PI and the present, which are due to changes in greenhouse gas concentrations. Anthropogenic forcing has been particularly intense over western Patagonia inducing reduction of precipitation in summer, autumn and winter as a consequence of progressively weaker westerly winds over the region, which have moved further poleward, between ca. 35–55°S and have become stronger south of about 50°S. Orbital variations between the MH to the PI period increased insolation over southern South America during summer and autumn inducing warmer conditions in the PI, accentuated by the effect of anthropogenic forcing during the last century. On the other hand, changes in orbital parameters from the MH to the PI period reduced insolation during winter and spring inducing colder conditions, which have been reversed by the anthropogenic forcing. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: FONDECYT, Fondo Nacional de Desarrollo Científico y Tecnológico
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53381
Appears in Collections: 过去全球变化的重建
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作者单位: Centro de Investigaciones del Mar y la Atmósfera/CONICET-UBA, UMI IFAECI/CNRS, Int. Guiraldes 2160, Ciudad Universitaria, Buenos Aires, Argentina; Departamento de Geofísica, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile; Laboratorio de Paleoecologia y Palinologia/Ecología y Paleoecologia de Ambientes Acuáticos Continentales, Instituto de Investigaciones Marinas y Costeras (IIMyC), CONICET-UNMdP, J.B.Justo 2550, Mar del Plata, Argentina
Recommended Citation:
Berman A.L.,Silvestri G.E.,Rojas M.,et al. Accelerated greenhouse gases versus slow insolation forcing induced climate changes in southern South America since the Mid-Holocene[J]. Climate Dynamics,2017-01-01,48(2017-01-02)