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Proxy value of n-alkan-2-ones in the Hongyuan peat sequence to reconstruct Holocene climate changes on the eastern margin of the Tibetan Plateau
Zheng, YH (Zheng, Yanhong)[1,2]; Zhou, WJ (Zhou, Weijian)[2]; Meyers, PA (Meyers, Philip A.)[3]
2011-09-25
发表期刊CHEMICAL GEOLOGY
卷号288期号:3-4页码:97-104
文章类型期刊论文
摘要

n-Alkan-2-ones in the Hongyuan peat core from the eastern margin of the Tibetan Plateau were investigated to assess the paleoclimate proxy value of variations in their compositions over the last 13,500 cal years. A homologous series of these compounds that ranged from C(19) to C(31) was identified throughout the peat sequence, maximizing at C(23) and showing a strong odd-over-even carbon chain length predominance. To help evaluate the possible paleoclimatic value of the n-alkan-2-ones in the Hongyuan peat core, we compared our molecular results with the pollen records from the same sequence. Results show that past changes in monsoon precipitation amounts as revealed by the ratio of Abies/Cyperaceae (firs/sedges) are also recorded in the n-alkan-2-one (C(23) + C(25))/(C(27) + C(29) + C(31))-KET ratio and CPI-KET (Carbon Preference Index) value. Stratigraphic variations of n-alkane and n-alkanoic acid ratios suggest that changes in the moisture-sensitive microbial alpha-oxidation of odd-chain n-alkanes and decarboxylation of even-chain length n-alkanoic acids is recorded in the abundance of n-alkan-2-ones. Changes in the monsoon rain intensity on millennial scales are also evident in the n-alkan-2-one proxies, indicating that their variations in the peat sequence are correlative with changes in microbial activity controlled by the Asian monsoon. (C) 2011 Published by Elsevier B.V.

关键词The Tibetan Plateau Peat n-Alkan-2-ones Paleoclimatic changes
DOI10.1016/j.chemgeo.2011.06.011
收录类别SCI
语种英语
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被引频次:20[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/361006/10280
专题加速器质谱中心
通讯作者Zhou, WJ (Zhou, Weijian)[2]
作者单位1.State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;
2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China;
3.Department of Geological Sciences, The University of Michigan, Ann Arbor, MI 48109-1005, USA
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Zheng, YH ,Zhou, WJ ,Meyers, PA . Proxy value of n-alkan-2-ones in the Hongyuan peat sequence to reconstruct Holocene climate changes on the eastern margin of the Tibetan Plateau[J]. CHEMICAL GEOLOGY,2011,288(3-4):97-104.
APA Zheng, YH ,Zhou, WJ ,&Meyers, PA .(2011).Proxy value of n-alkan-2-ones in the Hongyuan peat sequence to reconstruct Holocene climate changes on the eastern margin of the Tibetan Plateau.CHEMICAL GEOLOGY,288(3-4),97-104.
MLA Zheng, YH ,et al."Proxy value of n-alkan-2-ones in the Hongyuan peat sequence to reconstruct Holocene climate changes on the eastern margin of the Tibetan Plateau".CHEMICAL GEOLOGY 288.3-4(2011):97-104.
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