DOI: 10.1016/j.quascirev.2013.01.007
Scopus记录号: 2-s2.0-84873738577
论文题名: Estimating the hydrogen isotopic composition of past precipitation using leaf-waxes from western Africa
作者: Collins J.A. ; Schefuß E. ; Mulitza S. ; Prange M. ; Werner M. ; Tharammal T. ; Paul A. ; Wefer G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 65 起始页码: 88
结束页码: 101
语种: 英语
英文关键词: African
; Hydrogen isotopic composition of precipitation
; Leaf-waxes
; Organic geochemistry
Scopus关键词: African
; Fractionation factors
; Hydrogen isotopic composition
; Hydrological changes
; Last Glacial Maximum
; Late Holocene
; Leaf-waxes
; Marine cores
; n-Alkanes
; Organic geochemistry
; Quantitative estimates
; Vegetation type
; Wet season
; Forestry
; Hydrogen
; Isotopes
; Lasers
; Paraffins
; Vegetation
; Estimation
; coastal zone
; estimation method
; Heinrich event
; Holocene
; hydrological change
; isotopic composition
; Last Glacial Maximum
; leaf
; marine sediment
; organic geochemistry
; precipitation (climatology)
; relative humidity
; vegetation history
; wet season
; Africa
; Alkanes
; Forestry
; Humidity
; Hydrogen
; Isotopes
; Leaves
; Plants
; Precipitation
; Wax
; West Africa
英文摘要: The hydrogen isotopic composition of plant leaf-wax n-alkanes (δDwax) is a novel proxy for estimating δD of past precipitation (δDp). However, vegetation life-form and relative humidity exert secondary effects on δDwax, preventing quantitative estimates of past δDp. Here, we present an approach for removing the effect of vegetation-type and relative humidity from δDwax and thus for directly estimating past δDp. We test this approach on modern day (late Holocene; 0-3 ka) sediments from a transect of 9 marine cores spanning 21°N-23°S off the western coast of Africa. We estimate vegetation type (C3 tree versus C4 grass) using δ13C of leaf-wax n-alkanes and correct δDwax for vegetation-type with previously-derived apparent fractionation factors for each vegetation type. Late Holocene vegetation-corrected δDwax (δDvc) displays a good fit with modern-day δDp, suggesting that the effects of vegetation type and relative humidity have both been removed and thus that δDvc is a good estimate of δDp. We find that the magnitude of the effect of C3 tree - C4 grass changes on δDwax is small compared to δDp changes. We go on to estimate δDvc for the mid-Holocene (6-8 ka), the Last Glacial Maximum (LGM; 19-23 ka) and Heinrich Stadial 1 (HS1; 16-18.5 ka). In terms of past hydrological changes, our leaf-wax based estimates of δDp mostly reflect changes in wet season intensity, which is complementary to estimates of wet season length based on leaf-wax δ13C. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60688
Appears in Collections: 过去全球变化的重建
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作者单位: MARUM - Center for Marine Environmental Sciences, Faculty of Geosciences, University of Bremen, D-28359 Bremen, Germany; Alfred Wegener Institute for Polar and Marine Research, D-27570 Bremerhaven, Germany
Recommended Citation:
Collins J.A.,Schefuß E.,Mulitza S.,et al. Estimating the hydrogen isotopic composition of past precipitation using leaf-waxes from western Africa[J]. Quaternary Science Reviews,2013-01-01,65