DOI: 10.1016/j.quascirev.2015.08.004
Scopus记录号: 2-s2.0-84939781030
论文题名: Influence of Late Pleistocene and Holocene climate on vegetation distributions in southwest Africa elucidated from sedimentary n-alkanes - Differences between 12°S and 20°S
作者: Badewien T. ; Vogts A. ; Dupont L. ; Rullkötter J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 125 起始页码: 160
结束页码: 171
语种: 英语
英文关键词: Antarctic warming
; C3 plants
; C4 plants
; Carbon isotopes
; CO2
; Heinrich Stadial
; Holocene
; Insolation
; n-Alkanes
; Pleistocene
Scopus关键词: Catchments
; Incident solar radiation
; Isotopes
; Sediments
; Solar radiation
; Vegetation
; Antarctic warming
; Carbon isotopes
; Heinrich Stadial
; Holocenes
; n-Alkanes
; Pleistocene
; Paraffins
; alkane
; C3 plant
; C4 plant
; carbon dioxide
; carbon isotope
; deglaciation
; Heinrich event
; Holocene
; insolation
; isotopic composition
; Pleistocene
; population distribution
; sediment core
; vegetation structure
; Africa
; Atlantic Ocean
; Atlantic Ocean (Southeast)
英文摘要: Global and local climatic forcing, e.g. concentration of atmospheric CO2 or insolation, influence the distribution of C3 and C4 plants in southwest Africa. C4 plants dominate in more arid and warmer areas and are favoured by lower pCO2 levels. Several studies have assessed past and present continental vegetation by the analysis of terrestrial n-alkanes in near-coastal deep sea sediments using single samples or a small number of samples from a given climatic stage. The objectives of this study were to evaluate vegetation changes in southwest Africa with regard to climatic changes during the Late Pleistocene and the Holocene and to elucidate the potential of single sample simplifications. We analysed two sediment cores at high resolution, altogether ca. 240 samples, from the Southeast Atlantic Ocean (20°S and 12°S) covering the time spans of 18 to 1 ka and 56 to 2 ka, respectively. Our results for 20°S showed marginally decreasing C4 plant domination (of ca. 5%) during deglaciation based on average chain length (ACL27-33 values) and carbon isotopic composition of the C31 and C33n-alkanes. Values for single samples from 18 ka and the Holocene overlap and, thus, are not significantly representative of the climatic stages they derive from. In contrast, at 12°S the n-alkane parameters show a clear difference of plant type for the Late Pleistocene (C4 plant domination, 66% C4 on average) and the Holocene (C3 plant domination, 40% C4 on average). During deglaciation vegetation change highly correlates with the increase in pCO2 (r2 = 0.91). Short-term climatic events such as Heinrich Stadials or Antarctic warming periods are not reflected by vegetation changes in the catchment area. Instead, smaller vegetation fluctuations during the Late Pleistocene occur in accordance with local variations of insolation. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59831
Appears in Collections: 过去全球变化的重建
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作者单位: Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky University of Oldenburg, Germany; Leibniz Institute for Baltic Sea Research, Warnemünde (IOW), Germany; MARUM - Center for Marine Environmental Sciences, University of Bremen, Germany
Recommended Citation:
Badewien T.,Vogts A.,Dupont L.,et al. Influence of Late Pleistocene and Holocene climate on vegetation distributions in southwest Africa elucidated from sedimentary n-alkanes - Differences between 12°S and 20°S[J]. Quaternary Science Reviews,2015-01-01,125