Isotopic evolution of dissolved Ni, Cu, and Zn along the Kuroshio through the East China Sea
Isotopic evolution of dissolved Ni, Cu, and Zn along the Kuroshio through the East China Sea
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东海黑潮沿岸溶解的镍、铜和锌的同位素演化
DOI：
10.1016/j.marchem.2022.104135
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发表时间：
2022
期刊：
影响因子：
3
通讯作者：
Sohrin Yoshiki
中科院分区：
文献类型：
--
作者：
Takano Shotaro;Liao Wen-Hsuan;Ho Tung-Yuan;Sohrin Yoshiki
在本研究中，我们研究了北太平洋西部北赤道流到东中国海黑潮的溶解镍(Ni)、铜(Cu)和锌(Zn)的浓度和同位素比值的演化，那里的人为物质和成岩物质通过河流和风沙通道的输入相对较高。东中国海与西北太平洋深水中镍、铜、锌的含量和同位素比值相似。长江稀释水(盐度34.0)中镍、铜、锌的浓度分别为3.0~4.1nmol/kg、2.0~2.7nmoL/kg、0.5~1.1nmoL/kg，显著高于西北太平洋表层水，表明河流输入的影响。长江稀释水中Ni的同位素比值为+0.8~+1.4‰，低于西北太平洋表层水(<；15 0 m)的+1.7‰。溶解镍的浓度和同位素比值的分布符合长江冲淡水、黑潮表层水和西北太平洋深水三个端元之间的简单混合。利用Ni同位素比值和浓度的混合模型定量评价了东中国海溶解Ni的来源。长江稀释水中铜的同位素比值范围为+0.4~+0.5‰，锌的同位素比值范围为0.1~+0.2−，与冲绳海槽表层水相似，但低于远洋，如中太平洋。与已发表的全球海洋数据相比，一些沿海地区表层水中溶解的镍、铜和锌的同位素轻于远洋地区，表明轻同位素的镍、铜和锌来自大陆。
In this study, we have investigated the evolution of concentrations and isotope ratios of dissolved nickel (Ni), copper (Cu), and zinc (Zn) from the North Equatorial Current in the western North Pacific to the Kuroshio in the East China Sea, where the inputs of anthropogenic and lithogenic materials through riverine and aeolian pathways are relatively high. The concentrations and isotope ratios for Ni, Cu, and Zn in the deep water of the East China Sea are similar to those of the western North Pacific. The concentrations of Ni, Cu, and Zn in the Changjiang diluted water (<34.0 of salinity) are 3.0–4.1 nmol/kg, 2.0–2.7 nmol/kg, and 0.5–1.1 nmol/kg, respectively, which are significantly higher than those in the surface water of the western North Pacific, thereby indicating the impact of the riverine input. In the Changjiang diluted water, isotope ratios of Ni range from +0.8 to +1.4‰, which is lower than +1.7‰ observed in the surface water (<150 m) of the western North Pacific. The distribution of concentrations and isotope ratios for dissolved Ni fit with simple mixing among the three endmembers, Changjiang diluted water, Kuroshio surface water, and deep water in the western North Pacific. A mixing model using isotope ratios and concentrations for Ni quantitatively evaluates the sources of dissolved Ni in the East China Sea. The ranges of the isotope ratios are +0.4 to +0.5‰ for Cu and −0.1 to +0.2‰ for Zn in the Changjiang diluted water, which are similar to those in the surface water of the Okinawa Trough but lower than those in the distal ocean, such as the central Pacific. Compared with published data from the global ocean, dissolved Ni, Cu, and Zn are isotopically lighter in the surface water of some coastal regions than in the pelagic regions, indicating that isotopically light Ni, Cu, and Zn are supplied from the continents.