Analysis of observed iron (Fe) and nutrient data from the East Kamchatka Current (EKC) in the western Bering Sea, including the Kamchatka Basin, northeastern shelf slope, and Gulf of Anadyr, in the summers of 2014 and 2018 was conducted. The results indicate the location of the edge of high-nutrient and low-chlorophyll water (Fe-limited subarctic Pacific water), which expands into the EKC area. The supply of Fe was related to the freshwater supply from the Kamchatka Peninsula and caused nutrient depletion along the coast of the Kamchatka Peninsula in the EKC. Consistent with the subarctic Pacific, water with extremely high nitrate (N) and phosphate (P) concentrations and extremely low dissolved oxygen concentrations was observed in a wide density range in the intermediate layer (26.6–27.6 σ_θ) in the Kamchatka Basin and formed an intermediate nutrient pool. However, the concentrations of both dissolved Fe (dFe) and silicic acid (Si) were highest in the deep layer below the 27.6 σ_θ isopycnal surface in the basin, indicating that the dFe and Si cycles were decoupled from the N and P cycle in the basin intermediate water. The increase in dFe concentration with depth in the deep layer was probably due to a reduction in particulate Fe that occurred in the benthic pore water on the slope or in the settling particulate microenvironment, as indicated by a negative N* index. Based on the observed data around the Kamchatka Strait and EKC in the summer of 2018, the chemical properties of the water in the intermediate layers in the EKC on the Pacific side of the Kamchatka Peninsula were mainly influenced by circulation of the Western Subarctic Gyre, which flows from the southeastern Aleutian Islands, with minor influence from Kamchatka Basin water flowing through the Kamchatka Strait on the coastal side of the EKC. Our results also indicate that nutrient-rich water intrusion occurred from the Aleutian Basin intermediate nutrient pool to the bottom layer of the Gulf of Anadyr. Additionally, nitrate removal by via the denitrification process and the input of sedimentary Fe occurred in the intruding bottom water. The findings from this study are important for understanding the biogeochemical interactions occurring among the subarctic Pacific, Bering Sea, and Arctic Ocean.

对 2014 年和 2018 年夏季白令海西部（包括堪察加盆地、东北陆架斜坡和阿纳德尔湾）的东堪察加洋流 (EKC) 观测到的铁 (Fe) 和营养数据进行了分析。结果表明高营养和低叶绿素水（铁限制的亚北极太平洋水）边缘的位置，它扩展到了EKC区域。Fe 的供应与来自堪察加半岛的淡水供应有关，并导致 EKC 中堪察加半岛沿岸的养分枯竭。与亚北极太平洋一致，在中间层 (26.6–27.6 σ _θ) 在堪察加盆地形成了一个中间营养池。然而，溶解铁 (dFe) 和硅酸 (Si) 的浓度在 27.6 σ _θ以下的深层中最高盆地中的等密度面，表明 dFe 和 Si 循环与盆地中间水中的 N 和 P 循环解耦。dFe 浓度随深层深度增加可能是由于在斜坡底栖孔隙水中或沉降颗粒微环境中发生的颗粒 Fe 减少，如负 N* 指数所示。根据 2018 年夏季勘察加海峡和 EKC 周边观测资料，堪察加半岛太平洋一侧 EKC 中间层水的化学性质主要受西亚北极环流环流的影响。来自阿留申群岛东南部的河流，受堪察加盆地水流过 EKC 沿海一侧的堪察加海峡的影响较小。我们的结果还表明，从阿留申盆地中间营养池到阿纳德尔湾底层发生了富含营养的水侵入。此外，通过反硝化过程去除硝酸盐和沉积铁的输入发生在侵入底水中。这项研究的发现对于理解亚北极太平洋、白令海和北冰洋之间发生的生物地球化学相互作用非常重要。