Variable apparent hydrogen isotopic fractionation between sedimentary n-alkanes and precipitation on the Tibetan Plateau | |
Tian, Q (Tian, Qian)1,2; Hou, JZ (Hou, Juzhi)1,2; Wang, MD (Wang, Mingda)2 | |
刊名 | ORGANIC GEOCHEMISTRY |
2018-08-01 | |
卷号 | 122期号:0页码:78-86 |
关键词 | Delta-d Values Plant Leaf Wax Terrestrial Plants African Hydrology Surface Sediment Water Ratios Record Gradients Climate |
ISSN号 | 0146-6380 |
DOI | 10.1016/j.orggeochem.2018.05.011 |
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. |
学科主题 | 地理学 |
WOS研究方向 | Geochemistry & Geophysics |
语种 | 英语 |
出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
WOS记录号 | WOS:000437806200007 |
内容类型 | 期刊论文 |
源URL | [http://ir.itpcas.ac.cn/handle/131C11/8585] |
专题 | 青藏高原研究所_图书馆 |
通讯作者 | Hou, JZ (Hou, Juzhi) |
作者单位 | 1.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China; 2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China; 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China. |
推荐引用方式 GB/T 7714 | Tian, Q ,Hou, JZ ,Wang, MD . Variable apparent hydrogen isotopic fractionation between sedimentary n-alkanes and precipitation on the Tibetan Plateau[J]. ORGANIC GEOCHEMISTRY,2018,122(0):78-86. |
APA | Tian, Q ,Hou, JZ ,&Wang, MD .(2018).Variable apparent hydrogen isotopic fractionation between sedimentary n-alkanes and precipitation on the Tibetan Plateau.ORGANIC GEOCHEMISTRY,122(0),78-86. |
MLA | Tian, Q ,et al."Variable apparent hydrogen isotopic fractionation between sedimentary n-alkanes and precipitation on the Tibetan Plateau".ORGANIC GEOCHEMISTRY 122.0(2018):78-86. |
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