This study investigates the origins and transport mechanism of dissolved trace metals (d-Mn, d-Fe, d-Cu, and d-Co) and macronutrients in Ariake Sea, a shallow and semi-enclosed inlet bay during early summer. Concentrations of macronutrients and dissolved trace metals (d-Mn, d-Fe, d-Cu, and d-Co) were the highest in the surface waters of the innermost station in Ariake Sea and decreased gradually from the nearshore regions to the East China Sea. During estuarine mixing, d-Fe, d-Mn, and d-Cu showed non-conservative patterns, while d-Co exhibited a conservative pattern. This variability reflects the combined effects of water circulation and geochemically driven cycles in shaping the distribution of the metals. D-Mn and d-Fe were removed during estuarine mixing. Meanwhile, d-Cu pattern indicated input via intra-estuarine processes. The internal flux of d-Cu (1.6 × 10¹³ nmol/month) calculated from our data was slightly higher than its river fluxes (1.1 × 10¹³ nmol/month). We proposed sedimentary fluxes (2.1 × 10¹¹–1.8 × 10¹³ nmol/month) supplied more d-Cu than other possible sources such as photodissolution of SPM, groundwater discharge, and atmospheric deposition. The conservative pattern of d-Co reflected a balance between input and removal during estuarine mixing.

本研究调查了初夏浅水半封闭入口湾有明海中溶解的微量金属（d-Mn、d-Fe、d-Cu 和 d-Co）和常量营养素的起源和迁移机制。有明海最内站表层水中常量营养素和溶解微量金属（d-Mn、d-Fe、d-Cu、d-Co）浓度最高，从近岸向华东逐渐降低海。在河口混合过程中，d-Fe、d-Mn 和 d-Cu 表现出非保守模式，而 d-Co 表现出保守模式。这种可变性反映了水循环和地球化学驱动循环在塑造金属分布方面的综合影响。D-Mn 和 d-Fe 在河口混合过程中被去除。同时，d-Cu 模式表明通过河口内过程输入。¹³  nmol/月）根据我们的数据计算出略高于其河流通量（1.1 × 10 ¹³  nmol/月）。我们建议沉积通量（2.1 × 10 ¹¹ –1.8 × 10 ¹³  nmol/月）比其他可能的来源（如 SPM 的光溶解、地下水排放和大气沉积）提供更多的 d-Cu。d-Co 的保守模式反映了河口混合过程中输入和清除之间的平衡。