Arid
DOI10.1016/j.orggeochem.2018.05.011
Variable apparent hydrogen isotopic fractionation between sedimentary n-alkanes and precipitation on the Tibetan Plateau
Hou, Juzhi1,2; Tian, Qian1,3; Wang, Mingda1
通讯作者Hou, Juzhi
来源期刊ORGANIC GEOCHEMISTRY
ISSN0146-6380
出版年2018
卷号122页码:78-86
英文摘要

The hydrogen isotope ratio values of sedimentary leaf wax n-alkanes (delta D-wax) have been considered a reliable proxy for precipitation isotope ratios (delta D-P) across various transects on a global basis. Records of delta D-wax have been used to infer past changes in hydrology, climate and altimetry, assuming nearly constant apparent hydrogen isotopic fractionation (epsilon(wax-P)) between sedimentary leaf wax components and precipitation. Here, we present the results of an analysis of delta D-wax values from the surface sediments of 22 lakes across a precipitation and vegetation gradient on the Tibetan Plateau. The delta D-wax values correlated significantly with mean annual precipitation delta D (r 0.90) and summer precipitation delta D (r 0.91), suggesting that delta D-wax can record delta D-P in very dry regions. However, epsilon(wax-P) varies with annual precipitation as well as with relative humidity. Calculation using Craig-Gordon isotope models showed that the variable epsilon(wax-P) values likely resulted from intensive soil evaporation and plant evapotranspiration in this relatively arid region. This implies that variable isotopic fractionation should be taken into consideration when reconstructing paleohydrology, paleoclimate and paleoaltimetry. (C) 2018 Elsevier Ltd. All rights reserved.


英文关键词Sedimentary leaf wax D/H values Precipitation D/H values Apparent isotopic fractionation Tibetan Plateau
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000437806200007
WOS关键词DELTA-D VALUES ; PLANT LEAF WAX ; TERRESTRIAL PLANTS ; AFRICAN HYDROLOGY ; SURFACE SEDIMENT ; WATER ; RATIOS ; RECORD ; GRADIENTS ; CLIMATE
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构中国科学院青藏高原研究所
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/211904
作者单位1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China;
2.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China;
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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GB/T 7714
Hou, Juzhi,Tian, Qian,Wang, Mingda. Variable apparent hydrogen isotopic fractionation between sedimentary n-alkanes and precipitation on the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2018,122:78-86.
APA Hou, Juzhi,Tian, Qian,&Wang, Mingda.(2018).Variable apparent hydrogen isotopic fractionation between sedimentary n-alkanes and precipitation on the Tibetan Plateau.ORGANIC GEOCHEMISTRY,122,78-86.
MLA Hou, Juzhi,et al."Variable apparent hydrogen isotopic fractionation between sedimentary n-alkanes and precipitation on the Tibetan Plateau".ORGANIC GEOCHEMISTRY 122(2018):78-86.
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