DOI: 10.1016/j.quascirev.2015.08.012
Scopus记录号: 2-s2.0-84939789328
论文题名: Arctic climate response to the termination of the African Humid Period
作者: Muschitiello F. ; Zhang Q. ; Sundqvist H.S. ; Davies F.J. ; Renssen H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 125 起始页码: 91
结束页码: 97
语种: 英语
英文关键词: African Humid period
; Arctic climate
; Atmospheric circulation
; Mid Holocene
Scopus关键词: Atmospheric movements
; Atmospheric temperature
; Climatology
; Earth (planet)
; Hierarchical systems
; Repair
; Arctic climate
; Atmospheric circulation
; Coupled global climate model
; Holocenes
; Humid periods
; Oceanic poleward heat transport
; Precipitation change
; Surface temperatures
; Climate models
; albedo
; atmospheric circulation
; climate change
; climate modeling
; desertification
; Holocene
; humid environment
; interglacial
; perturbation
; precipitation (climatology)
; reconstruction
; surface temperature
; Arctic
; Atlantic Ocean
; Atlantic Ocean (North)
; Sahara
英文摘要: The Earth's climate response to the rapid vegetation collapse at the termination of the African Humid Period (AHP) (5.5-5.0 kyr BP) is still lacking a comprehensive investigation. Here we discuss the sensitivity of mid-Holocene Arctic climate to changes in albedo brought by a rapid desertification of the Sahara. By comparing a network of surface temperature reconstructions with output from a coupled global climate model, we find that, through a system of land-atmosphere feedbacks, the end of the AHP reduced the atmospheric and oceanic poleward heat transport from tropical to high northern latitudes. This entails a general weakening of the mid-latitude Westerlies, which results in a shift towards cooling over the Arctic and North Atlantic regions, and a change from positive to negative Arctic Oscillation-like conditions. This mechanism would explain the sign of rapid hydro-climatic perturbations recorded in several reconstructions from high northern latitudes at 5.5-5.0 kyr BP, suggesting that these regions are sensitive to changes in Saharan land cover during the present interglacial. This is central in the debate surrounding Arctic climate amplification and future projections for subtropical precipitation changes. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59833
Appears in Collections: 过去全球变化的重建
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作者单位: Bolin Centre for Climate Research, Stockholm University, Svante Arrhenius väg 8, Stockholm, Sweden; Department of Geological Sciences, Stockholm University, Svante Arrhenius väg 8, Stockholm, Sweden; Department of Physical Geography and Quaternary Geology, Stockholm University, Svante Arrhenius väg 8, Stockholm, Sweden; Department of Earth Sciences, VU University Amsterdam, De Boelelaan 1085-1087, Amsterdam, Netherlands
Recommended Citation:
Muschitiello F.,Zhang Q.,Sundqvist H.S.,et al. Arctic climate response to the termination of the African Humid Period[J]. Quaternary Science Reviews,2015-01-01,125