Distinctive distribution and migration of global fallout plutonium isotopes in an alpine lake and its implications for sediment dating
文献类型：期刊论文
| 作者 | Guo, Haiting1; Xu, Yihong2,3; Pan, Shaoming1; Liu, Zhiyong4,5 |
| 刊名 | CHEMOSPHERE
 |
| 出版日期 | 2021-09-01 |
| 卷号 | 279页码:10 |
| 关键词 | Pu isotopes Alpine lake sediments Snowmelt input Diffusive migration Advection-diffusion equation |
| ISSN号 | 0045-6535 |
| DOI | 10.1016/j.chemosphere.2021.130535 |
| 通讯作者 | Xu, Yihong(yhxu@ahnu.edu.cn) ; Pan, Shaoming(span@nju.edu.cn) |
| 英文摘要 | 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. |
| WOS关键词 | VERTICAL DISTRIBUTIONS ; LACUSTRINE SEDIMENTS ; BOTTOM SEDIMENTS ; OXIDATION-STATE ; MIXING RATES ; PU ISOTOPES ; CS-137 ; MOBILITY ; RADIOCESIUM ; PB-210 |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000659971200059 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | 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 |
| 源URL | [http://ir.ieecas.cn/handle/361006/16792]  |
| 专题 | 地球环境研究所_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. |
入库方式： OAI收割
来源：地球环境研究所
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