Collaborative Research: US GEOTRACES Pacific Section: Measurement of the organic complexation of dissolved iron, copper and cobalt, and total dissolved cobalt

溶解的铁（Fe）、铜（Cu）和钴（Co）是浮游植物生长的必需元素，这反过来又影响海洋碳循环;然而，尽管这些生物活性元素具有重要作用，但其循环、分布和生物利用度仍知之甚少。 例如，强有机配体影响生物利用度和溶解度，但目前尚不清楚在可变条件下整个水柱中的相互作用如何变化。百慕大海洋科学研究所、伍兹霍尔海洋学研究所和斯克里普斯海洋学研究所的研究人员认识到需要这一数据，将在2013年GEOTRACES考察期间测量溶解的铁、铜和钴的有机络合作用以及溶解的钴总浓度，这次考察将横切秘鲁沿海上升流区、一个强氧最低区、东太平洋海隆热液羽流、以及塔希提岛附近贫营养的沃茨。 这项研究将导致这些生物活性元素在整个水柱的形态，这将有助于评估溶解的铁，铜，钴分布和配体浓度梯度之间的关系，并可能揭示大的化学梯度在这个动态的海洋区域的重要数据集。 至于溶解的钴浓度，这些测量应提供新的见解海洋地球化学的元素，特别是在氧气最低区和热液羽。就更广泛的影响而言，为了开展外联工作，研究人员计划通过网络、在百慕大海洋科学研究所（BIOS）的图尔斯参观期间以及在每年的BIOS海洋科学服务日开放日上向公众传播他们的工作成果。以及通过与海洋科学教育卓越中心合作制作的五部分网络研讨会系列-海洋系统在缅因州大学和课堂课程。 伍兹霍尔海洋学研究所的一名研究生和斯克里普斯海洋学研究所的一名研究生将接受培训和支助，作为该项目的一部分。

Dissolved iron (Fe), copper (Cu), and cobalt (Co) are essential elements for phytoplankton growth which in turn influences the marine carbon cycle; however, despite this important role, the cycling, distribution, and bioavailability of these bioactive elements remains poorly understood. For example, strong organic ligands influence bioavailability and solubility, but it is unclear how interactions change throughout the water column under variable conditions. Recognizing a need for this data, researchers from the Bermuda Institute of Ocean Sciences, Woods Hole Oceanographic Institution, and Scripps Institute of Oceanography will measure the organic complexation of dissolved Fe, Cu, and Co as well as total dissolved Co concentrations during the 2013 GEOTRACES cruise which will transect the coastal upwelling zone off Peru, an intense oxygen minimum zone, the East Pacific Rise hydrothermal plume, and the oligotrophic waters near Tahiti. This study will result in a significant dataset on the speciation of these bioactive elements throughout the water column which will help assess the relationships between dissolved Fe, Cu, and Co distributions and ligand concentration gradients and will likely reveal large chemical gradients over this dynamic oceanographic region. As regards dissolved Co concentrations, these measurements should provide new insights on the marine biogeochemistry of the element, especially in relation to oxygen minimum zones and hydrothermal plumes. In terms of the broader impacts, for the outreach efforts, the researchers plan to disseminate results from their work to the public via the web, during tours at the Bermuda Institute of Ocean Sciences (BIOS), and at the annual BIOS Marine Science Service Day open house, as well as through a five-part webinar series produced in collaboration with the Center for Ocean Sciences Education Excellence-Ocean Systems at the University of Maine and classroom curricula. One graduate student from Woods Hole Oceanographic Institution and one graduate student from Scripps Institute of Oceanography would be trained and supported as part of this project.