| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
A call for refining the role of humic-like substances in the oceanic iron cycle
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| Autores: |
Whitby, Hannah
Planquette, Helene
Cassar, Nicolas
Bucciarelli, Eva
Osburn, Christopher L.
Janssen, David J.
Cullen, Jay T.
González, Aridane G.
Völker, Christoph
Sarthou, Geraldine
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| Data: |
2020-12
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| Ano: |
2020
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| Resumo: |
Primary production by phytoplankton represents a major pathway whereby atmospheric CO2 is sequestered in the ocean, but this requires iron, which is in scarce supply. As over 99% of iron is complexed to organic ligands, which increase iron solubility and microbial availability, understanding the processes governing ligand dynamics is of fundamental importance. Ligands within humic-like substances have long been considered important for iron complexation, but their role has never been explained in an oceanographically consistent manner. Here we show iron co-varying with electroactive humic substances at multiple open ocean sites, with the ratio of iron to humics increasing with depth. Our results agree with humic ligands composing a large fraction of the iron-binding ligand pool throughout the water column. We demonstrate how maximum dissolved iron concentrations could be limited by the concentration and binding capacity of humic ligands, and provide a summary of the key processes that could influence these parameters. If this relationship is globally representative, humics could impose a concentration threshold that buffers the deep ocean iron inventory. This study highlights the dearth of humic data, and the immediate need to measure electroactive humics, dissolved iron and iron-binding ligands simultaneously from surface to depth, across different ocean basins.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00622/73388/72598.pdf
https://archimer.ifremer.fr/doc/00622/73388/72599.pdf
https://archimer.ifremer.fr/doc/00622/73388/72600.xlsx
DOI:10.1038/s41598-020-62266-7
https://archimer.ifremer.fr/doc/00622/73388/
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| Editor: |
Springer Science and Business Media LLC
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| Relação: |
info:eu-repo/grantAgreement/EC/FP7/609102/EU//PRESTIGE
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| Formato: |
application/pdf
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| Fonte: |
Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2020-12 , Vol. 10 , N. 1 , P. 6144 (12p.)
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| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
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