Depth profile chlorophyll, macronutrient, trace metal, metal speciation, and carbon system data from FeOA project cruise SKQ202209S on the R/V Sikuliaq in the Northeast Pacific between June and July 2022

This dataset includes the concentrations of dissolved inorganic macronutrients (phosphate, nitrate plus nitrite (N+N), silicic acid, and nitrite), chlorophyll a and phaeophytin, dissolved trace metals (iron, manganese, nickel, zinc, copper), and labile dissolved nickel, as well as pH and total alkalinity measurements, from discrete depth profile samples collected on the FeOA cruise SKQ202209S on R/V Sikuliaq in the Northeast Pacific from June to July 2022. This project investigates the effects of ocean acidification on the associations between iron and organic ligands in seawater and on iron bioavailability to marine phytoplankton communities. The project used a combination of shipboard incubation experiments and depth profiles to characterize iron speciation and cycling across coastal upwelling, oligotrophic open ocean, and iron-limited subarctic oceanographic regimes in the NE Pacific. Surface seawater was incubated at pH of 8.1, 7.6, and 7.1 with natural iron and with dissolved iron amendments in order to investigate interactions between pH and iron bioavailability across the different regimes. Understanding how pH influences iron and its relationship with ligands provides important information for assessing the impacts of ocean acidification on primary production and biogeochemical processes.本数据集涵盖2022年6月至7月在东北太平洋开展的FeOA航次SKQ202209S中，由西库利亚克号科考船（R/V Sikuliaq）采集的离散深度剖面样品的检测数据，包括溶解态无机大量营养盐（磷酸盐、硝酸盐+亚硝酸盐（N+N）、硅酸、亚硝酸盐）、叶绿素a与脱镁叶绿素、溶解态痕量金属（铁、锰、镍、锌、铜）及活性溶解态镍，还有pH值与总碱度的测量结果。本项目旨在探究海洋酸化对海水中铁与有机配体结合状态的影响，以及对海洋浮游植物群落铁生物可利用性的作用。本项目结合船基培养实验与深度剖面分析，对东北太平洋沿岸上升流区、寡营养开阔大洋区以及铁限制亚北极海洋区域的铁形态与循环过程进行表征。本研究将采集的表层海水分别置于pH值为8.1、7.6和7.1的环境中开展培养，设置天然铁组与溶解态铁添加组，以此探究不同海洋区域内pH与铁生物可利用性的相互作用机制。阐明pH如何影响铁及其与配体的相互关系，可为评估海洋酸化对初级生产与生物地球化学过程的影响提供关键依据。