气候变化领域集成服务门户(CCPortal): Variable apparent hydrogen isotopic fractionation between sedimentary n-alkanes and precipitation on the Tibetan Plateau

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DOI	10.1016/j.orggeochem.2018.05.011
	Variable apparent hydrogen isotopic fractionation between sedimentary n-alkanes and precipitation on the Tibetan Plateau
	Hou, Juzhi; Tian, Qian; Wang, Mingda
通讯作者	Hou, JZ (通讯作者)
发表日期	2018
ISSN	0146-6380
起始页码	78
结束页码	86
卷号	122
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.
关键词	DELTA-D VALUES PLANT LEAF WAX TERRESTRIAL PLANTS AFRICAN HYDROLOGY SURFACE SEDIMENT WATER RATIOS RECORD GRADIENTS CLIMATE
英文关键词	Sedimentary leaf wax D/H values; Precipitation D/H values; Apparent isotopic fractionation; Tibetan Plateau
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000437806200007
来源期刊	ORGANIC GEOCHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259181
推荐引用方式 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.
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.
MLA	Hou, Juzhi,et al."Variable apparent hydrogen isotopic fractionation between sedimentary n-alkanes and precipitation on the Tibetan Plateau".ORGANIC GEOCHEMISTRY 122(2018).