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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, Weiguo ; Liu, Zhonghui ; Wang, Huanye ; He, Yuxin ; Wang, Zheng ; Xu, Liming
2011-04-01
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
AbstractLong-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. (C) 2011 Elsevier Ltd. All rights reserved.
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/6886
Collection中国科学院青海盐湖研究所
Recommended Citation
GB/T 7714
Liu, Weiguo,Liu, Zhonghui,Wang, Huanye,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.
APA Liu, Weiguo,Liu, Zhonghui,Wang, Huanye,He, Yuxin,Wang, Zheng,&Xu, Liming.(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.
MLA Liu, Weiguo,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 (2011).
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