| 中国东部海域中239+240Pu的来源与沉积过程研究 |
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| 引用本文： | 黄亚楠.中国东部海域中239+240Pu的来源与沉积过程研究[J].海洋学报,2022,44(11):77-87. |
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| 作者姓名： | 黄亚楠 |
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| 作者单位： | 1.中山大学 海洋科学学院，广东 珠海 519082 |
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| 基金项目： | 广东省青年优秀人才国际培养计划博士后项目（20210616） |
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| 摘 要： | 本文对东海及毗邻海域中239+240Pu比活度、240Pu/239Pu原子比值和239+240Pu累积通量或沉积通量数据进行整理，首次从大气沉降、海水中、生物体中、沉积物捕获器中以及沉积物中的239+240Pu 5个方面阐述了东海及毗邻海域中239+240Pu的地球化学行为。研究结果表明，全球大气沉降和太平洋核试验场输入的239+240Pu是东海海水和沉积物中239+240Pu的两个主要来源；在长江径流、浙闽沿岸流、台湾暖流、黑潮与上升流等水团的混合作用以及清除作用的影响下，东海近岸海水中239+240Pu浓度在时间上呈现被清除而减少的趋势，相应近岸浅水区沉积物中239+240Pu的埋藏深度高于远岸深水海域。在黑潮入侵和上升流的作用下，冲绳海槽区尤其是台湾岛东北部，沉积物中的239+240Pu比活度与沉积通量显著增大。同时，利用东海表层沉积物中239+240Pu比活度和240Pu/239Pu原子比值的相关关系证实了台湾东北部黑潮底层分支流的存在，并指示出台湾暖流与黑潮底层分支流可能交汇的海域位置。
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| 关 键 词： | 239+240Pu 240Pu/239Pu 东海 沉积物 海水 |
| 收稿时间： | 2021-11-19 |
Source and sedimentary process of 239+240Pu in the eastern China seas |
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| Institution: | 1.School of Marine Science, Sun Yat-sen University, Zhuhai 519082, China2.Centro Nacional de Aceleradores, Sevilla 41092, Spain |
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| Abstract: | This study compiled the data of 239+240Pu specific activity, 240Pu/239Pu atom ratio and 239+240Pu flux or inventory in the East China Sea and adjacent waters. Based on the 239+240Pu concentration in atmospheric fallout, 239+240Pu in seawater, 239+240Pu in organisms, 239+240Pu in sediment trap and 239+240Pu in sediment, the geochemical behavior of 239+240Pu were explained in the East China Sea and adjacent waters. The results showed that global fallout and Pacific proving grounds close-in fallout were the two major sources of 239+240Pu. Under the influence of water masses such as the Changjing River diluted water, Zhejiang-Fujian Coastal Current, Taiwan Warm Current, Kuroshio Current and upwelling current, mixing effect and removal effect, the concentration of 239+240Pu in coastal waters of the East China Sea showed a trend of removal over time, the burial depth of 239+240Pu in the near shore sediments was deeper than that in the far sea area. In the northeast of Taiwan Island of China, the 239+240Pu specific activity and 239+240Pu inventory in Okinawa Trough increased significantly under the influence of Kuroshio current intrusion and upwelling current. At the same time, this study found that the relationship between 239+240Pu specific activity and 240Pu/239Pu atom ratio in surface sediments of the East China Sea, and confirmed the existence of a tributary of the Kuroshio bottom in northeastern Taiwan, and indicated the location where the Taiwan Warm Current and a tributary of the Kuroshio bottom may intersect. |
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