The distribution of dissolved manganese (dMn) was studied in the Yellow Sea (YS) and East China Sea (ECS) onboard the GEOTRACES GP06-CN cruise in October 2015. Dissolved Mn samples were collected by both Niskin-X and CTD-Niskin systems at 8 clean stations and collected by the CTD-Niskin system at all 27 grid stations. There was no significant difference in dMn between the two systems (r = 0.98, p < 0.01, n = 39) from the results of the 8 clean stations. We used the “towed fish” system to collect high-resolution surface samples. The range and mean concentrations of dMn were 0.9–16.9 nM and 5.7 ± 2.5 nM in the ECS and 5.4–42.5 nM and 12.5 ± 5.3 nM in the YS. Dissolved Mn concentration decreased with increasing distance from the coast, with high concentrations (~ 42.5 nM) occurring around Jiaozhou Bay and the Zhe-Min coast and low concentrations (< 3.0 nM) appearing in the shelf break, which was affected by Kuroshio Water (KW) intrusion. Vertical distributions of dMn in the PN and QT sections showed that dMn concentrations were relatively high in the surface and near-bottom layers. Based on simplified two end-members mixing model calculations, we found that water mass mixing between the Changjiang Diluted Water (CDW) and KW, upward diffusion of dMn from the porewater, and release of dMn during sediment resuspension were the major influencing factors controlling the dMn behavior in the ECS. According to the positive correlation between the subsurface dMn maximum and apparent oxygen utilization (AOU) below 400 m in the shelf break, organic matter remineralization in the OMZ also affected dMn behavior in the ECS. Dissolved Mn was nearly conservative in the subsurface layers of the southern ECS. The presence of a dMn plume indicated cross-shelf transport at the subsurface at a potential density of 23.0–24.0 kg/m³. The plume was over the QT section, accompanied by a reduction in the dMn concentration to 12.2% of the concentration adjacent to the 50 m isobath and an output flux of 1.9 × 10 ⁸ mol Mn/yr. These results indicated that the ECS is highly efficient in pumping Mn-rich coastal waters to the Kuroshio region and western Pacific in autumn.

2015 年 10 月，在 GEOTRACES GP06-CN 游轮上研究了黄海 (YS) 和东海 (ECS) 中溶解锰 (dMn) 的分布。 溶解锰样品由 Niskin-X 和 CTD-Niskin 系统收集在 8 个清洁站，并由 CTD-Niskin 系统在所有 27 个网格站收集。两个系统之间的 dMn 没有显着差异（r  = 0.98，p  < 0.01，n = 39) 来自 8 个清洁站的结果。我们使用“拖鱼”系统来收集高分辨率的表面样本。dMn 的范围和平均浓度在 ECS 中为 0.9–16.9 nM 和 5.7 ± 2.5 nM，在 YS 中为 5.4–42.5 nM 和 12.5 ± 5.3 nM。溶解锰浓度随着离海岸距离的增加而降低，在胶州湾和浙闽海岸附近出现高浓度（~42.5 nM），在受黑潮水影响的陆架断裂处出现低浓度（< 3.0 nM）（ KW) 入侵。PN 和 QT 截面中 dMn 的垂直分布表明，dMn 浓度在表层和近底层中相对较高。基于简化的两个端元混合模型计算，我们发现长江稀释水 (CDW) 和 KW 之间的水团混合，再悬浮是控制 ECS 中 dMn 行为的主要影响因素。根据陆架断裂处地下 dMn 最大值与表观氧利用（AOU）之间的正相关关系，OMZ 中的有机质再矿化也影响了 ECS 中的 dMn 行为。溶解锰在南部 ECS 的地下层中几乎是保守的。dMn 羽流的存在表明在地下以 23.0–24.0 kg/m ³的潜在密度进行跨架运输。羽流在 QT 剖面上方，伴随着 dMn 浓度降低至 50 m 等深线附近浓度的 12.2%，输出通量为 1.9 × 10 ⁸摩尔锰/年。这些结果表明，ECS 在秋季向黑潮地区和西太平洋抽取富含锰的沿海水域是高效的。