Contribution of Electroactive Humic Substances to the Iron-Binding Ligands Released During Microbial Remineralization of Sinking Particles
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 2020 |
| Auteurs (6) | : | WHITBY H BRESSAC Matthieu SARTHOU Géraldine ELLWOOD Michael GUIEU Cecile BOYD P,w |
| Revue scientifique | : | Geophysical Research Letters |
| Volume | : | 47 |
| Fascicule | : | 7 |
| Pages | : | |
| DOI | : | 10.1029/2019GL086685 |
| URL | : | https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019gl086685 |
| Abstract | : | 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. |
| Mots-clés | : | Iron, ligand, humic, remineralisation, particle, degradation |
| Commentaire | : | e2019GL086685 2019GL086685 |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Whitby H, Bressac M, Sarthou G, Ellwood M, Guieu C, Boyd PW (2020) Contribution of Electroactive Humic Substances to the Iron-Binding Ligands Released During Microbial Remineralization of Sinking Particles. Geophys Res Lett 47 | doi: 10.1029/2019GL086685
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