Distinctive distribution and migration of global fallout plutonium isotopes in an alpine lake and its implications for sediment dating

doi:10.1016/j.chemosphere.2021.130535

IEECAS OpenIR > 黄土与第四纪地质国家重点实验室（2010~）

	Distinctive distribution and migration of global fallout plutonium isotopes in an alpine lake and its implications for sediment dating
	Guo, Haiting 1; Xu, Yihong 2,3; Pan, Shaoming 1; Liu, Zhiyong 4,5
通讯作者	Xu, Yihong(yhxu@ahnu.edu.cn) ; Pan, Shaoming(span@nju.edu.cn)
	2021-09-01
发表期刊	CHEMOSPHERE
ISSN	0045-6535
卷号	279 页码:10
摘要	This work investigated plutonium (Pu) isotopes in sediment cores collected from an alpine lake (Lake Heinongpo with 3779 m above sea level) in Southwestern China. Pu-240/Pu-239 atom ratios in all sediment samples showed the typical global fallout values of similar to 0.18 without any influences from other Pu contaminant sources. Pu239+240 activities with surface and subsurface maximums followed by exponential decline with sediment depth were respectively observed in the two sediment cores. The distinctive depth distributions of Pu-239,Pu-240 in the lake sediments was attributed to the very slow sediment deposition rate due to the lack of terrestrial sediment input, while the alpine snowmelt input was the primary source of Pu in the lake sediments in addition to the direct atmospheric deposition. The total Pu inventory was estimated to be 56.3 +/- 1.4 and 63.9 +/- 0.8 Bq/m(2) respectively in the two sediment cores. The generally higher Pu inventory in the Lake Heinongpo compared with other reported lakes in similar latitude should be mainly attributed to their different Pu input passages. The advection-diffusion equation was further applied to evaluate the downward migration of Pu isotopes in the sediment cores and predict the future evolution of Pu distribution in the sediment cores. The fitted results indicated that the diffusion effect controlled the downward migration of Pu in the sediments, but this diffusive migration will not prevent the peak of global fallout Pu in undisturbed sediment cores from being a valuable time marker for sediment dating. (C) 2021 Elsevier Ltd. All rights reserved.
关键词	Pu isotopes Alpine lake sediments Snowmelt input Diffusive migration Advection-diffusion equation
DOI	10.1016/j.chemosphere.2021.130535
关键词[WOS]	VERTICAL DISTRIBUTIONS ; LACUSTRINE SEDIMENTS ; BOTTOM SEDIMENTS ; OXIDATION-STATE ; MIXING RATES ; PU ISOTOPES ; CS-137 ; MOBILITY ; RADIOCESIUM ; PB-210
收录类别	SCI ; SCI
语种	英语
资助项目	National Key Research and Development Program of China[2016YFA0600502] ; National Natural Science Foundation of China[41877449] ; open fund of State Key Laboratory of Loess and Quaternary Geology, China[SKLLQG1624]
WOS研究方向	Environmental Sciences & Ecology
项目资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China ; open fund of State Key Laboratory of Loess and Quaternary Geology, China
WOS类目	Environmental Sciences
WOS记录号	WOS:000659971200059
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/16793
专题	黄土与第四纪地质国家重点实验室（2010~）
通讯作者	Xu, Yihong; Pan, Shaoming
作者单位	1.Nanjing Univ, Sch Geog & Ocean Sci, Minist Educ, Key Lab Coastal & Isl Dev, Nanjing 210023, Peoples R China 2.Anhui Normal Univ, Sch Geog & Tourism, Key Lab Earth Surface Proc & Reg Response Yangtze, Wuhu 241002, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 4.Soochow Univ, Sch Radiol & Interdisciplinary Sci RAD X, State Key Lab Radiat Med & Protect, Suzhou 215123, Peoples R China 5.Soochow Univ, Collaborat Innovat Ctr Radiat Med Jiangsu Higher, Suzhou 215123, Peoples R China
推荐引用方式 GB/T 7714	Guo, Haiting,Xu, Yihong,Pan, Shaoming,et al. Distinctive distribution and migration of global fallout plutonium isotopes in an alpine lake and its implications for sediment dating[J]. CHEMOSPHERE,2021,279:10.
APA	Guo, Haiting,Xu, Yihong,Pan, Shaoming,&Liu, Zhiyong.(2021).Distinctive distribution and migration of global fallout plutonium isotopes in an alpine lake and its implications for sediment dating.CHEMOSPHERE,279,10.
MLA	Guo, Haiting,et al."Distinctive distribution and migration of global fallout plutonium isotopes in an alpine lake and its implications for sediment dating".CHEMOSPHERE 279(2021):10.