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Holocene climate controls on water isotopic variations on the northeastern Tibetan Plateau
He, Yuxin1,2; Zhao, Cheng2,3,4; Liu, Zhonghui2; Wang, Huanye5; Liu, Weiguo5; Yu, Zicheng4; Zhao, Yan6,7; Ito, Emi8
2016-11-15
发表期刊CHEMICAL GEOLOGY
卷号440期号:2016页码:239-247
文章类型Article
摘要On the Tibetan Plateau, applications of delta D and delta O-18 values in paleoclimate studies tend to be complicated due to multiple processes influencing isotopic compositions in paleoclimatic archives. In this study, isotopic compositions of modern waters in the eastern Qaidam Basin on the northeastern Tibetan Plateau, and delta D values of n-fatty acids (n-FA delta D) from a sediment core at Hurleg Lake were systematically analyzed to infer hydroclimate controls during the Holocene. The modern water isotopic results show a major contribution of snowmelt water originating from high-elevation mountains to the north of the Qaidam Basin via river and groundwater discharge, and the importance of evaporation in affecting lake water budget in this region. n-C-26 FA delta D values tend to be more negative at millennial-scale warm-dry periods during the Holocene, and vice versa, opposite to what is commonly expected. Assisted with modern water isotopic results, we infer amplified contribution of snowmelt water to the soil water around this open lake system at warm-dry periods. Meanwhile, changes in n-C-16 FA delta D values at Hurleg Lake reflect the evolution of isotopic compositions of lake water, thus we use the isotopic difference between n-C-26 and n-C-16 FA (Delta DC16-C26) to infer hydroclimate and evaporation variations in this region. Based on our data, relatively low n-C-26 FA delta D and n-C-16 FA delta D values at 10-6 cal ka BP indicate large contribution of snowmelt water into the lake during the Holocene Climate Optimum. After 6 cal ka BP, changes in evaporation became the major control on lake hydrology and led to larger fluctuations of Delta DC16-C26. Our study highlights the importance of systematic analysis on modern processes before using stable isotopes for paleoclimate reconstructions, and demonstrates that delta D difference between long-chain and short-chain n-FA might be an effective way to better understand the controlling factor of hydrological variations in a climatic complex region like the Tibetan Plateau. (C) 2016 Elsevier B.V. All rights reserved.
关键词Hydrogen Isotopes Water Isotopes Leaf Wax Lake Sediments Tibetan Plateau Holocene
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.chemgeo.2016.07.024
关键词[WOS]INDIVIDUAL N-ALKANES ; ARID CENTRAL-ASIA ; PLANT LEAF WAXES ; DELTA-D VALUES ; D/H RATIOS ; LACUSTRINE SEDIMENTS ; LAKE QINGHAI ; ICE-CORE ; TERRESTRIAL PLANTS ; HIGH-RESOLUTION
收录类别SCI
语种英语
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000383937500019
引用统计
被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5661
专题加速器质谱中心
作者单位1.Zhejiang Univ, Sch Earth Sci, Hangzhou, Zhejiang, Peoples R China
2.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
3.Chinese Acad Sci, State Key Lab Lake Sci & Environm, Nanjing Inst Geog & Limnol, Nanjing 210008, Jiangsu, Peoples R China
4.Lehigh Univ, Dept Earth & Environm Sci, Bethlehem, PA 18015 USA
5.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian, Peoples R China
6.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China
7.Univ Chinese Acad Sci, Beijing, Peoples R China
8.Univ Minnesota, Dept Earth Sci, Limnol Res Ctr, Minneapolis, MN USA
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GB/T 7714
He, Yuxin,Zhao, Cheng,Liu, Zhonghui,et al. Holocene climate controls on water isotopic variations on the northeastern Tibetan Plateau[J]. CHEMICAL GEOLOGY,2016,440(2016):239-247.
APA He, Yuxin.,Zhao, Cheng.,Liu, Zhonghui.,Wang, Huanye.,Liu, Weiguo.,...&Ito, Emi.(2016).Holocene climate controls on water isotopic variations on the northeastern Tibetan Plateau.CHEMICAL GEOLOGY,440(2016),239-247.
MLA He, Yuxin,et al."Holocene climate controls on water isotopic variations on the northeastern Tibetan Plateau".CHEMICAL GEOLOGY 440.2016(2016):239-247.
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