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Contribution of electroactive humic substances to the iron-binding ligands released during microbial remineralization of sinking particles

Citation

Whitby, H and Bressac, M and Sarthou, G and Ellwood, MJ and Guieu, C and Boyd, PW, Contribution of electroactive humic substances to the iron-binding ligands released during microbial remineralization of sinking particles, Geophysical Research Letters, 47, (7) Article e2019GL086685. ISSN 0094-8276 (2020) [Refereed Article]


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Copyright Statement

2020 by The Authors. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License, (https://creativecommons.org/licenses/by/4.0/) which permits use, distribution and reproduction in any medium, provided the original work is properly sited.

DOI: doi:10.1029/2019GL086685

Abstract

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.

Item Details

Item Type:Refereed Article
Keywords:humic substances, iron-binding ligands, iron, seawater
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical oceanography
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Measurement and assessment of marine water quality and condition
UTAS Author:Bressac, M (Dr Matthieu Bressac)
UTAS Author:Boyd, PW (Professor Philip Boyd)
ID Code:152072
Year Published:2020
Web of Science® Times Cited:5
Deposited By:Ecology and Biodiversity
Deposited On:2022-08-11
Last Modified:2022-09-07
Downloads:2 View Download Statistics

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