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DOI	10.1016/j.quascirev.2020.106413
	Time marker of 137Cs fallout maximum in lake sediments of Northwest China
	Lan J.; Wang T.; Chawchai S.; Cheng P.; Zhou K.; Yu K.; Yan D.; Wang Y.; Zang J.; Liu Y.; Tan L.; Ai L.; Xu H.
发表日期	2020
ISSN	0277-3791
卷号	241
英文摘要	Caesium-137 (137Cs) has no natural source and is commonly employed in establishing the chronology of recent lake sediments in the Anthropocene epoch. Because of their location in the northern mid-latitude Westerlies circulation region, downwind of the Chernobyl accident and their proximity to the Lop Nur Chinese Nuclear Testing (CNT) site, lake sediments in NW China record a137Cs fallout maximum of global atmospheric thermonuclear weapon tests (GTWT) in 1963–1964 Common Era (CE), with probably local fallout subpeaks due to the Chernobyl accident in 1986 CE and CNT in 1976 CE. This complexity means that the use of 137Cs fallout maximum in lake sediments as a time marker in NW China is thus far not well constrained, impeding assessment of recent and future changes in paleoclimate and human activities. To identify the 137Cs time marker and provide a reliable chronology of surface lake sediments for investigating paleoclimatic changes and for defining the Anthropocene epoch in NW China during the last 50–100 years, here we describe chronologies of 6 near-surface sediment cores from NW China based on 137Cs and 210Pb activities, and review the chronology of 23 lake sediments and 10 ice cores from NW China and central Asia based on 137Cs, 210Pb, 239+240Pu, 3H, 241Am, and beta-activity dating methods, and annual layer counting, as well as 240Pu/239Pu isotopic ratios. Based on the potential influence of radioactivity transport from the Chernobyl accident and CNT, and the comparison with deposition records of 26 European lake sediments and 5 Alpine ice cores, we propose that the 137Cs fallout maximum of lake sediments in NW China and central Asia is primarily attributable to GTWT and that there is no unambiguous evidence to confirm the Chernobyl- and CNT-derived 137Cs local-fallout subpeaks. Taking into account the approximately one-year delay between injection of 137Cs into the atmosphere and its incorporation in lake sediment records, we conclude that the 137Cs fallout maximum in lake sediments of NW China provides a reliable GTWT time marker for 1964 CE. © 2020 Elsevier Ltd
英文关键词	Anthropocene; Central Asia; Chronology; Ice core; Radionuclides; Recent lake sediment
语种	英语
scopus关键词	Fallout; Lakes; Lead compounds; Nuclear reactor accidents; Nuclear weapons; Chernobyl accident; Human activities; Isotopic ratios; Lake sediments; Lake-sediment records; Natural sources; NorthWest China; Nuclear testing; Sediments; Anthropocene; cesium isotope; Chernobyl accident; complexity; geoaccumulation; geochronology; lacustrine deposit; paleoclimate; radioactivity; radionuclide migration; sediment pollution; time series analysis; China; Lop Nur; Xinjiang Uygur
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/151414
作者单位	State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an, 710061, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Geology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand; Key Laboratory of Disaster Monitoring and Mechanism Simulating of Shaanxi Province, Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China; Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, 710049, China; Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin, 300072, China
推荐引用方式 GB/T 7714	Lan J.,Wang T.,Chawchai S.,et al. Time marker of 137Cs fallout maximum in lake sediments of Northwest China[J],2020,241.
APA	Lan J..,Wang T..,Chawchai S..,Cheng P..,Zhou K..,...&Xu H..(2020).Time marker of 137Cs fallout maximum in lake sediments of Northwest China.Quaternary Science Reviews,241.
MLA	Lan J.,et al."Time marker of 137Cs fallout maximum in lake sediments of Northwest China".Quaternary Science Reviews 241(2020).