长江口邻近海域夏季溶解态稀土元素的空间分布特征  

Spatial distribution characteristics of dissolved rare earth elements in the Yangtze River Estuary adjacent sea area in summer

作　　者：朱祖浩 李锐 郑爱榕[2] 郑雪红[2] 陈丁[2] ZHU Zuhao;LI Rui;ZHENG Airong;ZHENG Xuehong;CHEN Ding(Fourth Institute of Oceanography,Ministry of Natural Resources,Beihai 536000,China;College of Ocean and Earth Sciences,Xiamen University,Xiamen 361102,China)

机构地区：[1]自然资源部第四海洋研究所,广西北海536000 [2]厦门大学海洋与地球学院,福建厦门361102

出　　处：《厦门大学学报（自然科学版）》2020年第S01期114-123,共10页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金海洋科学基地野外实践能力提高项目(J1310037);北海市科技计划项目(201995037)。

摘　　要：稀土元素的分布和某些稀土元素之间的比值可应用于物质来源及演化过程以及水团移动等地球化学过程的示踪.本文研究了2016年7月长江口邻近海域的溶解态稀土元素的空间分布特征及其与环境因子的相关性.结果表明溶解态稀土元素的平面分布在表底两层表现出截然相反的特征,表层受长江输送的影响呈现出明显的西北至东南向递减趋势,底层则受控于南部台湾暖流水团混合、颗粒物解析和部分溶解,表现为南高北低的特点,中层颗粒活性不同的轻重稀土元素表现出不同的分布特点.研究海域溶解态稀土元素的垂直分布大体表现为表层最高、中层和底层高低不一的特点,主要受长江冲淡水输送和底层外部水团输送的影响.对溶解态稀土元素和盐度分布的同步分析表明,二者具有显著的负相关关系,表明盐度是该研究海域溶解态稀土元素的分布等行为的关键影响因素.The spatial distribution of rare earth elements,as well as the ratio of some rare earth elements,can be used to trace geochemical processes such as the origin and evolution of substances and the movement of water masses.In this paper,the spatial distribution of dissolved rare earth elements in the Yangtze River Estuary adjacent sea area in July,2016 and their correlations with environmental factors were studied.The results showed that the horizontal distribution of the dissolved rare earth elements in the surface layer and bottom layer werecompletely opposite.The surface layer showed an obvious decreasing trend from northwest to southeast under the influence of the Yangtze River,and the bottom layer was controlled by mixing with the Taiwan warm current,desorption of particulate matter and partial dissolution,which showed the feature of relatively high concentrations in the south and low in the north.The middle layer showed different distribution characteristics for light and heavy rare earth elements with different particulate activities.The vertical distribution of dissolved rare earth elements in the studied area was characterized by the highest concentrations in the surface layer,which was mainly affected by the fresh water from the Yangtze River and an external water mass from the bottom layer.There was a significant negative correlation between the distribution of dissolved rare earth elements and salinity,indicating that salinity was the key factor affecting the distribution of dissolved rare earth elements in the studied area.

关 键 词：长江口 溶解态稀土元素 空间分布 

分 类 号：P734.2[天文地球—海洋化学]