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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
Source PublicationCHEMICAL GEOLOGY
AbstractOn 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.
KeywordHydrogen Isotopes Water Isotopes Leaf Wax Lake Sediments Tibetan Plateau Holocene
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000383937500019
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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
Recommended Citation
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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