气候变化领域集成服务门户(CCPortal): Spatial variability and the controlling mechanisms of surface sediments from Nam Co, central Tibetan Plateau, China

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DOI	10.1016/j.sedgeo.2015.01.011
	Spatial variability and the controlling mechanisms of surface sediments from Nam Co, central Tibetan Plateau, China
	Wang, Junbo; Zhu, Liping; Wang, Yong; Ju, Jianting; Daut, Gerhard; Li, Minghui
通讯作者	Wang, JB (通讯作者)
发表日期	2015
ISSN	0037-0738
EISSN	1879-0968
起始页码	69
结束页码	77
卷号	319
英文摘要	Sixty-six surface sediments were retrieved from Nam Co, central Tibetan Plateau, to evaluate the spatial variability of their distributions and controls across the entire lake. Grain size distribution, total carbon, total nitrogen, total sulfur, Pb-210 and (CS)-C-137 activities, and carbon and oxygen isotopes of carbonate of the bulk sediments were analyzed, and the correlations among these variables, as well as water depth, were calculated. The results showed distinct spatial variability for all variables. The grain size distribution provides adequate information to reflect water energy levels within the lake. Based on these factors, the accumulation zone of Nam Co was distinguished from the erosional and transportation zones. The results indicate that the deep area (>80 m) of the central main basin and the centre of the eastern small basin serve as the accumulation zones in Nam Co. Water depth is the most important factor influencing the distribution of the surface sediments because all variables show different distribution patterns in shallow and deep areas. Additionally, river input, sediment focusing, grain size effects, and heterogeneous physicochemical features of the lake water, as well as possible currents within the lake, also play different roles that affect surface sediment characteristics. Water depth noticeably affects grain size and the delta C-13 and delta O-15 values of carbonate sediment, implying that these proxies could be used as indicators of lake level change. These findings are of significance for palaeoenvironmental interpretations when using these proxies. (C) 2015 Elsevier B.V. All rights reserved.
关键词	HYDROLOGICAL CHANGES LAKE SEDIMENT GRAIN-SIZE ORGANIC-MATTER ELEMENTS POLLEN RECORD VEGETATION AFRICA BAIKAL
英文关键词	Geochemical proxies; Spatial variability; Lake level; Controlling mechanisms; Nam Co; Tibetan Plateau
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000351795400006
来源期刊	SEDIMENTARY GEOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258472
推荐引用方式 GB/T 7714	Wang, Junbo,Zhu, Liping,Wang, Yong,et al. Spatial variability and the controlling mechanisms of surface sediments from Nam Co, central Tibetan Plateau, China[J]. 中国科学院青藏高原研究所,2015,319.
APA	Wang, Junbo,Zhu, Liping,Wang, Yong,Ju, Jianting,Daut, Gerhard,&Li, Minghui.(2015).Spatial variability and the controlling mechanisms of surface sediments from Nam Co, central Tibetan Plateau, China.SEDIMENTARY GEOLOGY,319.
MLA	Wang, Junbo,et al."Spatial variability and the controlling mechanisms of surface sediments from Nam Co, central Tibetan Plateau, China".SEDIMENTARY GEOLOGY 319(2015).