Dissolved iron-binding ligand concentrations and conditional stability constants from field samples collected on US GEOTRACES GP17-ANT cruise NBP24-01 on RVIB Palmer in the Amundsen Sea from Nov 2023 to Jan 2024

Iron is an essential micronutrient for marine life, and its distribution across the world ocean is mostly driven by its complexation by a fraction of the dissolved organic matter pool called iron-binding ligands. This dataset includes the concentration and conditional stability constant of dissolved iron-binding ligands of samples collected during the U.S. GEOTRACES GP17-ANT cruise. This cruise was aiming to investigate the distribution of trace metals and dependent variables in the Amundsen Sea (Antarctica), hotspot of primary production and of major interest in carbon cycling. The cruise departed Punta Arenas (Chile) on November 29th, 2023 and arrived in Lyttelton (New Zealand) on January 28th 2024, after sample collection in the Amundsen Sea (Antarctica). Seawater samples were collected with a tow-fish and a trace metal clean rosette equipped with 24 GoFlo bottles, placed in acid-clean FLPE bottles, and stored frozen (-20 degrees Celsius) until onboard analysis by Dr. Léo Mahieu, if not analyzed within 24 hours after collection. The Amundsen Sea is the site of some of the biggest phytoplanktonic blooms happening seasonally across the world ocean, and is, therefore, an important zone for carbon fixation and export. Yet, uncertainty remains about the processes fueling this bloom, notably for iron. The Amundsen Sea is characterized by shallow depth allowing for connectivity between sediment resuspension and phytoplankton iron supply, and by one of the higher rates of the sea-ice melt rate observed on the Antarctic continent. This dataset is the first one to present iron-binding ligand characteristics in samples deeper than 300 m in the Amundsen Sea, and allows us to report on the impact of sediment resuspension, ice melting, and biological productivity on iron-binding ligand characteristics and on their role in transporting iron in the Amundsen Sea.铁是海洋生物必需的微量营养元素，其在全球海洋中的分布主要受与一类被称为铁结合配体（iron-binding ligands）的溶解有机质组分络合作用调控。本数据集涵盖了美国GEOTRACES GP17-ANT航次采集样品中溶解态铁结合配体的浓度与条件稳定常数。本次航次旨在探究南极阿蒙森海（Amundsen Sea）中痕量金属及其相关变量的分布特征——该海域是海洋初级生产的热点区域，也是碳循环研究的重点关注对象。该航次于2023年11月29日从智利蓬塔阿雷纳斯起航，在南极阿蒙森海完成样品采集后，于2024年1月28日抵达新西兰利特尔顿。海水样品采用拖曳式采样器与搭载24个GoFlo采水器的痕量金属洁净采水罗塞塔系统采集，样品被分装至经酸清洗的FLPE瓶中，并于-20℃冷冻保存，若采集后24小时内未能开展现场分析，则交由Léo Mahieu博士在船上进行后续检测。 阿蒙森海是全球海洋中季节性大规模浮游植物水华发生的区域之一，因此是碳固定与碳输出的重要海域。然而，支撑该水华发生的过程（尤其是铁元素相关过程）仍存在诸多不确定性。阿蒙森海海域水深较浅，使得沉积物再悬浮与浮游植物铁供应之间形成关联；同时，该海域也是南极大陆上海冰融化速率最高的区域之一。本数据集首次公开了阿蒙森海300米以深海域的铁结合配体特征数据，可用于解析沉积物再悬浮、海冰融化与生物生产过程对铁结合配体特征的影响，以及配体在阿蒙森海铁元素输运过程中发挥的作用。