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Historical changes in 239Pu and 240Pu sources in sedimentary recordsin the East China Sea: Implications for provenance and transportation
Wang,JL(Wang,Jinlong)1; Baskaran,M(Baskaran, Mark)2; Hou,XL(Hou,Xiaolin)2,4; Du,JZ(Du,Jinzhou)1; Zhang,J(Zhang,Jing)1; Du,Jinzhou
2017-05-15
发表期刊Earth and Planetary Science Letters
卷号466期号:2017页码:32-42
文章类型期刊论文
摘要Concentrations and isotopic compositions of plutonium (Pu) are widely used for its source identification and to determine transport processes of Pu-associated particulate matter and water. We investigated the concentrations of 239Pu and 240Pu and their ratios in a number of sediment samples from the East China Sea (ECS) collected in the summer of 2013 (August 6-28). The 239+240Pu activity concentrations in surface sediment samples were found to range between 0.048 and 0.492 Bq kg-1 and the 240Pu/239Pu atom ratios showed a similar trend as that of the 239, 240Pu activities; the Pu atom ratios ranged from 0.158 to 0.297 and were mostly higher than the mean global fallout value of 0.18. The 239, 240Pu inventories in the ECS varied widely, from 2 to 807 Bq m-2, with the highest values commonly found in the coastal areas. In the Yangtze Estuary, the mean 239+240Pu activity concentration is close to the estimated value of the suspended material from the Yangtze River catchment (0.18 Bq kg-1), and the 240Pu/239Pu atom ratio was found to be ∼0.18, which indicates that the Yangtze River input is the dominant source of Pu for this area. The total annual Yangtze River input of 239+240Pu was estimated to be 2.4 ×1010 Bq, which is small compared to the total amount of 239+240Pu buried, 3.1 ×1013 Bq in the whole ECS. The Pacific Proving Ground input appears to be the dominant source of Pu to the ECS, accounting for 45%-52% of the total inventory. The fractional amount of 239+240Pu scavenged from the total 239+240Pu transported by the Kuroshio Current (KC) and Taiwan Warm Current (TWC) into ECS sediments is estimated to be ∼10%. Our study shows that the 240Pu/239Pu atom ratio is useful not only to obtain a better insight of the biogeochemistry influenced by the KC, but also to trace the long-range transport of other particle-reactive species. Besides, the sedimentation rates obtained based on the penetration depths of 239+240Pu and vertical profiles of excess 210Pb agree within uncertainties, which suggests that 239+240Pu can potentially be used as a chronostratigraphic time marker in the marine environment.
关键词East China Sea Plutonium Isotopic Ratio Sediment Transportation Mass Balance
DOI10.1016/j.epsl.2017.03.005
收录类别SCI
所属项目编号2011CB409801 ; OCE-1237059 ; 201406140049
语种英语
项目资助者Ministry of Science andTechnology of PR China ; Ministry of Science andTechnology of PR China ; the U.S. National Science Foundation ; the U.S. National Science Foundation ; China Scholarship Council ; China Scholarship Council ; Fund of ECNU for Overseas Scholars ; Fund of ECNU for Overseas Scholars
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文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5599
专题加速器质谱中心
通讯作者Du,Jinzhou
作者单位1.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China
2.Department of Geology, Wayne State University, Detroit, MI, 48202-3622, USA
3.Center for Nuclear Technologies, Technical University of Denmark, Risø Campus, Roskilde 4000, Denmark
4.Xi’an AMS Center, SKLLQG, Institute of Earth Environment, CAS, 710061, Xi’an, PR China
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Wang,JL,Baskaran,M,Hou,XL,et al. Historical changes in 239Pu and 240Pu sources in sedimentary recordsin the East China Sea: Implications for provenance and transportation[J]. Earth and Planetary Science Letters,2017,466(2017):32-42.
APA Wang,JL,Baskaran,M,Hou,XL,Du,JZ,Zhang,J,&Du,Jinzhou.(2017).Historical changes in 239Pu and 240Pu sources in sedimentary recordsin the East China Sea: Implications for provenance and transportation.Earth and Planetary Science Letters,466(2017),32-42.
MLA Wang,JL,et al."Historical changes in 239Pu and 240Pu sources in sedimentary recordsin the East China Sea: Implications for provenance and transportation".Earth and Planetary Science Letters 466.2017(2017):32-42.
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