| 137Cs 测年的1986 年时标探讨 |
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| 引用本文： | 任珊,潘少明,徐仪红,郝永佩.137Cs 测年的1986 年时标探讨[J].海洋通报,2018(2):192-200. |
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| 作者姓名： | 任珊 潘少明 徐仪红 郝永佩 |
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| 作者单位： | 南京大学地理与海洋科学学院，江苏南京210023；海岸与海岛开发教育部重点实验室，江苏南京210023,南京大学地理与海洋科学学院，江苏南京210023；海岸与海岛开发教育部重点实验室，江苏南京210023,南京大学地理与海洋科学学院，江苏南京210023；海岸与海岛开发教育部重点实验室，江苏南京210023,南京大学地理与海洋科学学院，江苏南京210023；海岸与海岛开发教育部重点实验室，江苏南京210023 |
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| 基金项目： | 国家重点研发计划项目（2016YFA0600502）；国家自然科学基金（41671466）；国家自然科学基金青年基金（41501286）；江苏省自然科学基金青年基金（BK20150578） |
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| 摘 要： | 本文依据日本监测的137Cs 年大气沉降通量，利用相应的降水数据进行修正，定量分析长江口1986 年137Cs 大气沉降特征，结合长江口沉积物中137Cs 与239+240Pu 比活度垂直剖面的分布特征对1986 年时标进行探讨，同时讨论了识别该时标的方法。结论如下： （1） 长江口137Cs 大气沉降通量趋势与日本东京基本一致，1986 年都存在明显的137Cs 沉降峰，所以长江口沉积物中应存在切尔诺贝利核事故泄露的137Cs 蓄积峰记录。（2） 相比于稳定的湖泊沉积环境，沉积动力环境复杂的长江口可以结合Pu 同位素推断137Cs 剖面的1986 年次级峰，但是根据沉积物平均沉积速率、蓄积峰比值等推算此次级峰较为困难，所以对1986 年辅助计年时标的应用要慎重。
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| 关 键 词： | 137Cs 次蓄积峰 1986 年时标 长江口 |
| 收稿时间： | 2017/3/30 0:00:00 |
| 修稿时间： | 2017/7/10 0:00:00 |
Study and discussion on 1986 time marker in 137Cs dating |
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| REN Shan,PAN Shao-ming,XU Yi-hong and HAO Yong-pei.Study and discussion on 1986 time marker in 137Cs dating[J].Marine Science Bulletin,2018(2):192-200. |
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| Authors: | REN Shan PAN Shao-ming XU Yi-hong and HAO Yong-pei |
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| Institution: | School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China; Ministry of Education Key Laboratory for Coastal and Island Development, Nanjing 210023, China,School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China; Ministry of Education Key Laboratory for Coastal and Island Development, Nanjing 210023, China,School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China; Ministry of Education Key Laboratory for Coastal and Island Development, Nanjing 210023, China and School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China; Ministry of Education Key Laboratory for Coastal and Island Development, Nanjing 210023, China |
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| Abstract: | In this work, we revise the corresponding precipitation data with the 137Cs atmospheric deposition monitored by Japan and accordingly analyze the atmospheric depositional characteristics of Yangtze River Estuary in 1986. In addition, the distributions of 137Cs and 239+240Pu activity in vertical profile in sediments are combined to study the dating marker 1986 in Yangtze Estuary, and the methods of determining the marker are also discussed. The results are as follows: (1) Trend of atmospheric deposition of 137Cs in the Yangtze River Estuary is nearly consistent with that of Tokyo, and there is an obvious peak of 137Cs in 1986. Therefore, sediments in the Yangtze River Estuary should exist 137Cs accumulation peak record resulted from Chernobyl nuclear accident; (2) Sedimentary dynamics are complicated in Yangtze River Estuary compared with stable lacustrine deposition environment. We used plutonium isotope to infer the sub-peak in 137Cs profile related to 1986. However, it is difficult to reckon this peak on the basis of average deposition rate and accumulation peak ratio. Hence, the application of the time marker 1986 should be careful. |
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| Keywords: | 137Cs sub-peak 1986 Yangtze River Estuary |
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