DOI: 10.1016/j.quascirev.2014.09.016
Scopus记录号: 2-s2.0-84908501129
论文题名: Late Quaternary vegetation dynamics and hydro-climate in the Drakensberg, South Africa
作者: Norström E. ; Neumann F.H. ; Scott L. ; Smittenberg R.H. ; Holmstrand H. ; Lundqvist S. ; Snowball I. ; Sundqvist H.S. ; Risberg J. ; Bamford M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 105 起始页码: 48
结束页码: 65
语种: 英语
英文关键词: Holocene
; Late Quaternary
; Mineral magnetics
; N-Alkanes
; Paleoclimate
; Pollen
; South Africa
; Stable carbon isotopes
; Vegetation dynamics
Scopus关键词: Holocenes
; Late quaternary
; n-Alkanes
; Paleoclimates
; Pollen
; South Africa
; Stable carbon isotopes
; Vegetation dynamics
; carbon
; climate variation
; El Nino-Southern Oscillation
; fynbos
; isotopic fractionation
; paleoclimate
; Pleistocene-Holocene boundary
; pollen
; reconstruction
; regional climate
; sediment analysis
; speleothem
; stable isotope
; vegetation dynamics
; wetland
; South Africa
英文摘要: A multi-proxy study of a sediment sequence from Braamhoek wetland, covering the last c. 16,000 years, reveals a record of regional climate and vegetation dynamics in the Drakensberg region, South Africa, including signals from both the organic sediment fraction (fossil pollen, charcoal, n-alkane abundance, n-alkane δ13C, TOC) and the inorganic fraction (mineral magnetic properties). The reconstruction, supported by a robust chronology, indicates two major periods of increased regional wetness during the late Pleistocene to early Holocene phase (c. 13,800-12,600calyrBP; c. 10,200-8500calyrBP) and one during the late Holocene (c. 2000calyrBP to present). Drier conditions are recorded during the Younger Dryas (c. 12,600-11,300calyrBP) and mid-Holocene (c. 7000-2000calyrBP). A major decline in fynbos vegetation during the early Holocene suggests a shift towards warmer temperatures and possibly towards less pronounced winter rains in eastern South Africa from c. 8500calyrBP. Comparison with records from interior of South Africa show relatively high inter-site variability, however, the Braamhoek moisture proxies do co-vary with the speleothem isotope records from Makapansgat, suggesting a similar hydro-climate evolution in eastern and interior parts of the summer rainfall region during the studied period. On multi-millennial time scales, an inverse hydro-climatological pattern is evident between these two South African records and reconstructions from tropical locations in southeast Africa. Such a rainfall dipole between eastern tropical and southern Africa, has previously been identified on shorter time scales, i.e. on inter-annual to millennial scales. The Braamhoek study suggests that a similar dipole pattern is acting also on a multi-millennial perspective. These long-term precipitation anomalies are tentatively coupled to teleconnections from multi-millennial changes in the dynamics of the Indian Ocean Dipole (IOD) and El Niño-Southern Oscillation (ENSO). © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60118
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geological Sciences, Stockholm University, Sweden; Bert Bolin Centre for Climate Research, Stockholm University, Sweden; Forschungsstelle für Paläobotanik, Westfälische Wilhelms-Universität, Münster, Germany; Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa; Department of Plant Sciences, University of the Free State, Bloemfontein, South Africa; Department of Physical Geography and Quaternary Geology, Stockholm University, Sweden; Department of Applied Environmental Sciences (ITM), Stockholm University, Sweden; Department of Earth Sciences, Uppsala University, Sweden
Recommended Citation:
Norström E.,Neumann F.H.,Scott L.,et al. Late Quaternary vegetation dynamics and hydro-climate in the Drakensberg, South Africa[J]. Quaternary Science Reviews,2014-01-01,105