Water depth affecting thaumarchaeol production in Lake Qinghai, northeastern Qinghai-Tibetan plateau: Implications for paleo lake levels and paleoclimate

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	Water depth affecting thaumarchaeol production in Lake Qinghai, northeastern Qinghai-Tibetan plateau: Implications for paleo lake levels and paleoclimate
	Wang, Huanye 1,2,3,4; Dong, Hailiang 5,6; Zhang, Chuanlun L.2,7; Jiang, Hongchen 5; Zhao, Meixun 8; Liu, Zhonghui 9; Lai, Zhongping 3; Liu, Weiguo 1
	2014-03-12
发表期刊	CHEMICAL GEOLOGY
卷号	368 页码:76-84
关键词	Thaumarchaeol Delta C-13(Org) Lake Level Paleohydrology Lake Qinghai Qinghai-tibetan Plateau
摘要	Archaeal glycerol dialkyl glycerol tetraethers (GDGTs) are increasingly popular and versatile tool for palaeolimnology studies, but their applications in paleohydrology are scarce, especially for thaumarchaeol which is specific for the newly proposed phylum Thaumarchaeota. After investigating our published GDGT data of Lake Qinghai, we found that both the concentration of thaumarchaeol and the relative abundance of thaumarchaeol to total archaeal GDGTs (%thaum) in core-top sediments increased significantly with increasing water depth (R=0.88 and 0.95, respectively), with lower concentrations of 5+/-5 ng/g in shallow areas (water depth<5m) and higher concentrations of 121+/-65ng/g in deep areas (water depth>10m). This is likely because that the producers of thaumarchaeol, Thaumarchaeota, prefer living in the relative deeper zone in lacustrine systems, where probably both competition of ammonium (the substrate) from other microbes and light intensity are low. Therefore, we proposed that thaumarchaeol was mainly produced in situ and changes in % thaum might reflect water-depth variations in this closed-basin lake. The application of % thaum as a water-depth indicator in a Holocene sediment sequence of core QH-2011 provided a high-resolution relative lake-level history of Lake Qinghai which resembles that inferred from the delta C-13(org) value obtained in the same core. This supports the use of %thaumas an indicator of lakewater depth in paleohydrology studies, especially for medium lakes. Moreover, the records of the two independent proxies in core QH-2011 confirmed a shallow Lake Qinghai in the early Holocene and a late-Holocene highstand, highlighting the importance of local temperature (and evaporation loss) in controlling effective moisture in the arid/semi-arid region. (C) 2014 Elsevier B. V. All rights reserved.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5674
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
作者单位	1.Chinese Acad Sci, IEE, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China 2.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China 3.Chinese Acad Sci, Qinghai Inst Salt Lake, Key Lab Salt Lake Resources & Chem, Beijing 100864, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China 6.Miami Univ, Dept Geol & Environm Earth Sci, Oxford, OH 45056 USA 7.Univ Georgia, Dept Marine Sci, Athens, GA 30602 USA 8.Ocean Univ China, Qingdao Collaborat Innovat Ctr Marine Sci & Techn, Key Lab Marine Chem Theory & Technol, Minist Educ, Qingdao 266100, Peoples R China 9.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Wang, Huanye,Dong, Hailiang,Zhang, Chuanlun L.,et al. Water depth affecting thaumarchaeol production in Lake Qinghai, northeastern Qinghai-Tibetan plateau: Implications for paleo lake levels and paleoclimate[J]. CHEMICAL GEOLOGY,2014,368:76-84.
APA	Wang, Huanye.,Dong, Hailiang.,Zhang, Chuanlun L..,Jiang, Hongchen.,Zhao, Meixun.,...&Liu, Weiguo.(2014).Water depth affecting thaumarchaeol production in Lake Qinghai, northeastern Qinghai-Tibetan plateau: Implications for paleo lake levels and paleoclimate.CHEMICAL GEOLOGY,368,76-84.
MLA	Wang, Huanye,et al."Water depth affecting thaumarchaeol production in Lake Qinghai, northeastern Qinghai-Tibetan plateau: Implications for paleo lake levels and paleoclimate".CHEMICAL GEOLOGY 368(2014):76-84.