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Salinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, China
Liu, WG (Liu, Weiguo)[1,2]; Liu, ZH (Liu, Zhonghui)[3]; Wang, HY (Wang, Huanye)[1]; He, YX (He, Yuxin)[3]; Wang, Z (Wang, Zheng)[1]; Xu, LM (Xu, Liming)[4]
2011-04-01
发表期刊GEOCHIMICA ET COSMOCHIMICA ACTA
卷号75期号:7页码:1693-1703
文章类型期刊论文
摘要

Long-chain alkenones in lacustrine settings are potentially excellent biomarkers for the reconstruction of past terrestrial environmental conditions, and have been found in many different types of lakes around the globe. A wider range of factors influence the occurrence and distribution of alkenones in lake sediments and waters when compared to marine systems. Lake environmental conditions, such as temperature (in particular) and salinity, are among the key factors controlling alkenone distributions in lacustrine settings. Here we investigated alkenone distribution patterns in lakes of the northern Qinghai-Tibetan Plateau, China, and their possible relationship with environmental conditions, by analyzing paired samples of suspended particulate matter in surface waters and surface sediments. Salinity of investigated lake waters ranges from almost 0 to similar to 100 g/L, while temperature variation among the lakes is minimal, effectively eliminating temperature effects on the alkenone distribution patterns observed here. We show that (1) alkenone concentrations vary substantially between the lakes, yet controlling mechanisms remain elusive; (2) C(37)/C(38) ratios are substantially lower in the lakes of the Qaidam Basin than in the Lake Qinghai region, probably indicating different alkenone producers in the two regions; and (3) large variations in %C(37:4) (the percentage of the C(37:4) alkenone), determined from both surface waters and sediments, are negatively correlated with salinity. We suggest that the %C(37:4) index could be used as a salinity indicator at least on a regional scale, with careful considerations of other potentially complicating factors. However, potential reasons for why salinity could significantly affect %C(37:4) values need further investigation.

DOI10.1016/j.gca.2010.10.029
收录类别SCI
语种英语
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/10254
专题加速器质谱中心
通讯作者Liu, WG (Liu, Weiguo)[1,2]
作者单位1.State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi’an 710075, China;
2.School of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
3.Department of Earth Sciences, The University of Hong Kong, Hong Kong, China;
4.Qinghai Institute of Salt Lake, CAS, Xining 810008, China
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GB/T 7714
Liu, WG ,Liu, ZH ,Wang, HY ,et al. Salinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, China[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2011,75(7):1693-1703.
APA Liu, WG ,Liu, ZH ,Wang, HY ,He, YX ,Wang, Z ,&Xu, LM .(2011).Salinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, China.GEOCHIMICA ET COSMOCHIMICA ACTA,75(7),1693-1703.
MLA Liu, WG ,et al."Salinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, China".GEOCHIMICA ET COSMOCHIMICA ACTA 75.7(2011):1693-1703.
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