气候变化领域集成服务门户(CCPortal): Contribution of Electroactive Humic Substances to the Iron-Binding Ligands Released During Microbial Remineralization of Sinking Particles

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DOI	10.1029/2019GL086685
	Contribution of Electroactive Humic Substances to the Iron-Binding Ligands Released During Microbial Remineralization of Sinking Particles
	Whitby H.; Bressac M.; Sarthou G.; Ellwood M.J.; Guieu C.; Boyd P.W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:7
英文摘要	Iron is a key micronutrient in seawater, but concentrations would be negligible without the presence of organic ligands. The processes influencing the ligand pool composition are poorly constrained, limiting our understanding of the controls on dissolved iron distributions. To address this, the release of iron and iron-binding ligands during the microbial remineralization of sinking particles was investigated by deploying in situ particle interceptor/incubator devices at subsurface sites in the Mediterranean Sea and Subantarctic. Analyses revealed that the pool of released ligands was largely dominated by electroactive humic substances (74 ± 28%). The release of ligands during remineralization ensured that concurrently released iron remained in solution, which is crucial for iron regeneration. This study presents compelling evidence of the key role of humic ligands in the subsurface replenishment of dissolved iron and thus on the wider oceanic dissolved iron inventory, which ultimately controls the magnitude of iron resupplied to the euphotic zone. ©2020. The Authors.
英文关键词	Binding sites; Dissolution; Iron; Dissolved iron; Electro actives; Humic substances; Mediterranean sea; Organic ligands; Remineralization; Sinking particles; Subsurface sites; Ligands
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170495
作者单位	Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom; CNRS, Univ Brest, IRD, Ifremer, LEMAR, Plouzané, France; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, LOV, Villefranche-sur-mer, France; Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia; The Center for Prototype Climate Modeling, New York University in Abu Dhabi, Abu Dhabi, United Arab Emirates; Antarctic Climate and Ecosystems Collaborative Research Center, University of Tasmania, Hobart, TAS, Australia
推荐引用方式 GB/T 7714	Whitby H.,Bressac M.,Sarthou G.,et al. Contribution of Electroactive Humic Substances to the Iron-Binding Ligands Released During Microbial Remineralization of Sinking Particles[J],2020,47(7).
APA	Whitby H.,Bressac M.,Sarthou G.,Ellwood M.J.,Guieu C.,&Boyd P.W..(2020).Contribution of Electroactive Humic Substances to the Iron-Binding Ligands Released During Microbial Remineralization of Sinking Particles.Geophysical Research Letters,47(7).
MLA	Whitby H.,et al."Contribution of Electroactive Humic Substances to the Iron-Binding Ligands Released During Microbial Remineralization of Sinking Particles".Geophysical Research Letters 47.7(2020).