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Distribution and stoichiometry of Al, Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb in the East China Sea
Journal of Oceanography ( IF 2.3 ) Pub Date : 2020-11-23 , DOI: 10.1007/s10872-020-00577-z
Yuzuru Nakaguchi , Yoshinori Ikeda , Atsushi Sakamoto , Linjie Zheng , Tomoharu Minami , Yoshiki Sohrin

The dissolved (d) and total dissolvable (td) trace metals were determined in seawater samples collected from the East China Sea (ECS). Labile particulate (lp) species was calculated as td minus d, and the sectional and vertical distributions of d and lp trace metals were evaluated. The surface concentrations of dAl, dCo, dNi, dCu, and dPb were higher in the continental shelf region than in the Kuroshio region. lpAl and lpFe were the dominant species below a depth of 400 m, and a strong positive correlation was observed between them in the Kuroshio region. The enrichment factor (EF) against crustal abundance was calculated for the purpose of estimating the origin of dMs in the ECS. The EF(dFe) was close to unity. These results suggest that both lpFe and dFe are dominated by crustal sources. The other elements had high EF, indicating significant contributions from other sources. EF(dPb) was close to the enrichment factor in aerosol, suggesting atmospheric input from anthropogenic sources. The dM/P ratios were calculated to investigate the validity of the extended Redfield ratio in the ECS. The Mn/P, Co/P, Cu/P, Zn/P, and Cd/P ratios in shallow water (< 200 m) were within the same order of magnitude as those in phytoplankton. In contrast, the Al/P and Fe/P ratios were, respectively, 27 and 213 times higher in phytoplankton compared to those in shallow water. These results suggest that dFe is a potential limiting factor for biological production, although it is not exhausted in surface water.

中文翻译:

东海Al、Mn、Fe、Co、Ni、Cu、Zn、Cd、Pb的分布及化学计量

在从东海 (ECS) 收集的海水样品中测定溶解 (d) 和总可溶解 (td) 痕量金属。不稳定颗粒 (lp) 种类计算为 td 减去 d,并评估 d 和 lp 痕量金属的截面和垂直分布。dAl、dCo、dNi、dCu 和 dPb 的表面浓度在大陆架地区高于黑潮地区。lpAl和lpFe是400 m以下的优势种,在黑潮地区它们之间存在很强的正相关关系。计算了相对于地壳丰度的富集因子 (EF),目的是估计 ECS 中 dMs 的起源。EF(dFe) 接近于 1。这些结果表明 lpFe 和 dFe 都以地壳来源为主。其他元素具有高 EF,表明其他来源的重大贡献。EF(dPb) 接近气溶胶中的富集因子,表明来自人为来源的大气输入。计算 dM/P 比率以研究 ECS 中扩展的 Redfield 比率的有效性。浅水(< 200 m)中的Mn/P、Co/P、Cu/P、Zn/P和Cd/P比率与浮游植物的比率在同一数量级内。相比之下,浮游植物中的 Al/P 和 Fe/P 比分别比浅水中的高 27 和 213 倍。这些结果表明 dFe 是生物生产的潜在限制因素,尽管它不会在地表水中耗尽。计算 dM/P 比率以研究 ECS 中扩展的 Redfield 比率的有效性。浅水(< 200 m)中的Mn/P、Co/P、Cu/P、Zn/P和Cd/P比率与浮游植物的比率在同一数量级内。相比之下,浮游植物中的 Al/P 和 Fe/P 比分别比浅水中的高 27 和 213 倍。这些结果表明 dFe 是生物生产的潜在限制因素,尽管它不会在地表水中耗尽。计算 dM/P 比率以研究 ECS 中扩展的 Redfield 比率的有效性。浅水(< 200 m)中的Mn/P、Co/P、Cu/P、Zn/P和Cd/P比率与浮游植物的比率在同一数量级内。相比之下,浮游植物中的 Al/P 和 Fe/P 比分别比浅水中的高 27 和 213 倍。这些结果表明 dFe 是生物生产的潜在限制因素,尽管它不会在地表水中耗尽。
更新日期:2020-11-23
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