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题名: A 15 ka lake water delta D record from Genggahai Lake, northeastern Tibetan Plateau, and its paleoclimatic significance
其他题名: A 15 ka lake water δD record from Genggahai Lake, northeastern Tibetan Plateau, and its paleoclimatic significance
作者: Rao, ZG; Qiang, MR; Jia, GD; Li, YX; Dan, D; Chen, FH(陈发虎)
收录类别: SCIE ; EI
出版日期: 2016-07
刊名: ORGANIC GEOCHEMISTRY
卷号: 97, 页码:5-16
出版者: ELSEVIER
出版地: OXFORD
英文摘要: The mid-chain and long chain n-alkanes in sediments of Genggahai Lake, on the northeastern Tibetan Plateau, have been assigned as being predominantly from aquatic plants. Thus, at the lake, compound specific hydrogen isotopic data for mid-and long chain n-alkanes (delta Dn-alkanes) are indicators of the variation in lake water delta D (delta D-LW). Genggahai dDLW is determined by the local meteoric water dD (delta D-MW) and by lake surface evaporation, as evidenced by modern observational data and the broad correlation between Genggahai dDLW and average lake water depth during the past 15 ka, with more negative dDLW values corresponding to greater average water depth. As demonstrated by the mid-and long chain dDn-alkanes data, the most negative interval of Genggahai delta D-LW was during the early Holocene. An overall trend towards more positive values from the early to the late Holocene clearly indicates the long term evolutionary history of local dDMW, which could be related to the intensity of the Indian summer monsoon (ISM) via the "rainfall amount effect". Therefore, the record of dDLW at Genggahai during the past 15 ka, which resembles that of stalagmite delta O-18 records from the core ISM region, apparently reflects the long term evolution of ISM intensity. Furthermore, several short-term positive excursions in Genggahai dDLW values during the late Holocene reflect enhanced lake surface evaporation via an "isotopic enrichment" mechanism that apparently resulted from periods of weakened ISM intensity. Our results highlight the fact that unambiguous source determination of n-alkanes is vital for determining the paleoclimatic significance of lacustrine dDn-alkanes data. (C) 2016 Elsevier Ltd. All rights reserved.
关键词: Northeastern Tibetan Plateau ; Mid and long chain n-alkanes ; Compound specific hydrogen isotopes ; Lake water delta D ; Indian summer monsoon ; Past 15 ka
作者部门: [Rao, Zhiguo ; Qiang, Mingrui ; Li, Yunxia ; Dan, Dan ; Chen, Fahu] Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China ; [Jia, Guodong] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Guangdong, Peoples R China ; [Jia, Guodong] Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
通讯作者: Rao, ZG (reprint author), Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China.
学科分类: Geochemistry & Geophysics
文章类型: Article
所属项目编号: National Science Foundation of China [40901055, 41271219, 41372181] ; project of the Chinese Ministry of Education [113057A]
所属项目名称: 国家自然科学基金项目 ; 教育部科学技术研究重点项目
项目资助者: NSFC ; MOE
语种: 英语
DOI: 10.1016/j.orggeochem.2016.03.007
ISSN号: 0146-6380
WOS记录号: WOS:000376532900002
EI记录号: 20161702298957
IR记录号: WOS:000376532900002
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/182333
Appears in Collections:资源环境学院_期刊论文

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Recommended Citation:
Rao, ZG,Qiang, MR,Jia, GD,et al. A 15 ka lake water delta D record from Genggahai Lake, northeastern Tibetan Plateau, and its paleoclimatic significance[J]. ORGANIC GEOCHEMISTRY,2016,97:5-16.
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