气候变化领域集成服务门户(CCPortal): New approach to assessing age uncertainties – The 2300-year varve chronology from Eklutna Lake; Alaska (USA)

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DOI	10.1016/j.quascirev.2018.10.018
	New approach to assessing age uncertainties – The 2300-year varve chronology from Eklutna Lake; Alaska (USA)
	Fortin D.; Praet N.; McKay N.P.; Kaufman D.S.; Jensen B.J.L.; Haeussler P.J.; Buchanan C.; De Batist M.
发表日期	2019
ISSN	0277-3791
起始页码	90
结束页码	101
卷号	203
英文摘要	Developing robust chronological frameworks of lacustrine sediment is central to reconstructing past environmental changes. We present varve chronologies from five sites extending back 2300 years from Eklutna Lake, in the Chugach Mountains of south-central Alaska. The chronologies are built from image analysis of high-resolution photographs and CT scans of sediment cores. The age uncertainty of each record is tested by three methods. We first present varve chronologies from individual sites and reconcile the difference in varve delimitation from two observers. The varve chronologies from each site are then compared to each other using a series of marker beds that can be traced across the lake basin. Finally, using a new Bayesian probabilistic model, we develop age models that incorporate information regarding age uncertainty from the multiple-observer method and the age distribution of marker layers from multiple cores. To evaluate the accuracy of the Bayesian model output, we used seven radiocarbon ages from terrestrial macrofossils and four tephra layers traceable across the core sites. The major-element geochemistry of the tephra layers and their ages are presented here for the first time. The Bayesian age model offers a new approach to quantifying age uncertainty in inter-correlated cores of varved sediment. © 2018 Elsevier Ltd
英文关键词	Age model; Alaska; Geochronology; Tephra; Varve
语种	英语
scopus关键词	Bayesian networks; Computerized tomography; Geochronology; Lakes; Probability distributions; Sediments; Age modeling; Alaska; Bayesian probabilistic models; Environmental change; Lacustrine sediments; Tephra; Varve; Varve chronologies; Uncertainty analysis; age structure; chronology; geochemistry; geochronology; lacustrine deposit; paleoenvironment; radiocarbon dating; sediment core; tephra; uncertainty analysis; varve; Alaska; Chugach Mountains; Coast Ranges; Eklutna Lake; United States
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/152076
作者单位	School of Earth & Sustainability, Northern Arizona University, Flagstaff, AZ, United States; Renard Centre of Marine Geology, Ghent University, Krijgslaan 281, S8 WE13, Ghent, 9000, Belgium; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada; U.S. Geological Survey, 4210 University Drive, Anchorage, AK, United States
推荐引用方式 GB/T 7714	Fortin D.,Praet N.,McKay N.P.,等. New approach to assessing age uncertainties – The 2300-year varve chronology from Eklutna Lake; Alaska (USA)[J],2019,203.
APA	Fortin D..,Praet N..,McKay N.P..,Kaufman D.S..,Jensen B.J.L..,...&De Batist M..(2019).New approach to assessing age uncertainties – The 2300-year varve chronology from Eklutna Lake; Alaska (USA).Quaternary Science Reviews,203.
MLA	Fortin D.,et al."New approach to assessing age uncertainties – The 2300-year varve chronology from Eklutna Lake; Alaska (USA)".Quaternary Science Reviews 203(2019).