中国东部海域中^(239+240)Pu的来源与沉积过程研究  

Source and sedimentary process of ^(239+240)Pu in the eastern China seas

作　　者：黄亚楠 Huang Ya’nan(School of Marine Science,Sun Yat-sen University,Zhuhai 519082,China;Centro Nacional de Aceleradores,Sevilla 41092,Spain)

机构地区：[1]中山大学海洋科学学院,广东珠海519082 [2]西班牙国家加速器中心,安达卢西亚自治区塞维利亚41092

出　　处：《海洋学报》2022年第11期77-87,共11页

基　　金：广东省青年优秀人才国际培养计划博士后项目(20210616)。

摘　　要：本文对东海及毗邻海域中^(239+240)Pu比活度、^(240)Pu/^(239)Pu原子比值和^(239+240)Pu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+240)Pu 5个方面阐述了东海及毗邻海域中^(239+240)Pu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+240)Pu是东海海水和沉积物中^(239+240)Pu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+240)Pu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+240)Pu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+240)Pu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+240)Pu比活度和^(240)Pu/^(239)Pu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。This study compiled the data of ^(239+240)Pu specific activity,^(240)Pu/^(239)Pu atom ratio and ^(239+240)Pu flux or inventory in the East China Sea and adjacent waters.Based on the ^(239+240)Pu concentration in atmospheric fallout,Pu in seawater,^(239+240)Pu in organisms,^(239+240)Pu in sediment trap and ^(239+240)Pu in sediment,the geochemical behavior of ^(239+240)Pu 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+240)Pu.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+240)Pu in coastal waters of the East China Sea showed a trend of removal over time,the burial depth of ^(239+240)Pu in the near shore sediments was deeper than that in the far sea area.In the northeast of Taiwan Island of China,thePu specific activity and ^(239+240)Pu 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 betweenPu specific activity and ^(240)Pu/^(239)Pu 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.

关 键 词：^(239+240)Pu ^(240)Pu/^(239)Pu 东海 沉积物 海水 

分 类 号：P736.44[天文地球—海洋地质]