气候变化领域集成服务门户(CCPortal): Chronology of Holocene lacustrine sediments in Co Ngoin, central Tibetan Plateau

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DOI	10.1007/s11430-006-0991-3
	Chronology of Holocene lacustrine sediments in Co Ngoin, central Tibetan Plateau
	Wu Yanhong; Wang Sumin; Hou Xinhua
发表日期	2006
ISSN	1006-9313
起始页码	991
结束页码	1001
卷号	49 期号:9
英文摘要	Chronology is the basis for using lacustrine sediments to reconstruct the history of environmental change. Radioactive-nuclides such as C-14, Pb-210 and Cs-137 dating are mainly used to establish the chronology for recent several ten thousand years. Because of being mixed with dead carbon, the measured C-14 age is always older than the actual age which is recognized as reservoir effect. Cs is a kind of active metal element, and easy to migrate vertically in the sediment that leads to the error of the time marker. Pb-210 dating should make sure to select CIC model or CRIS model. On the Tibetan Plateau, most of the lakes are alkaline closed lake where Cs is more moveable in the sediment and the reservoir effect caused by dead carbon on C-14 dating is stronger. Based on the analysis on results of C-14, Pb-210 and Cs-137 of the lacustrine sediments from Co Ngoin, central Tibetan Plateau, we use the simple regression method to re-calculate the C-14 calendar ages, and establish the time sequence for cores CE-1 and CE-2 with result of Pb-210 CRS model for the upper 35 cm and recalculated C-14 calendar age for sediments bellow 35 cm. Since 1400 cal. a BP, sedimentation interrupted for more than 1000 years. According to this time sequence, variations of environmental proxies confidently reflect the major climatic events in Holocene.
关键词	BASIN WESTERN TIBET ENVIRONMENTAL-CHANGES MIDHOLOCENE CLIMATE STABLE ISOTOPES LAKE PALEOCLIMATE CARBON RECORD CHINA
英文关键词	C-14; Pb-210 and (CS)-C-137; chronology; lacustrine sediments; climatic event; Co Ngoin; central Tibetan Plateau
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000241845500010
来源期刊	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
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/257419
推荐引用方式 GB/T 7714	Wu Yanhong,Wang Sumin,Hou Xinhua. Chronology of Holocene lacustrine sediments in Co Ngoin, central Tibetan Plateau[J]. 中国科学院青藏高原研究所,2006,49(9).
APA	Wu Yanhong,Wang Sumin,&Hou Xinhua.(2006).Chronology of Holocene lacustrine sediments in Co Ngoin, central Tibetan Plateau.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,49(9).
MLA	Wu Yanhong,et al."Chronology of Holocene lacustrine sediments in Co Ngoin, central Tibetan Plateau".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 49.9(2006).