Data/hora: 05/06/2024 15:52:26

Provedor de dados: | 5
País: | France
Título: | A call for refining the role of humic-like substances in the oceanic iron cycle
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.
Data: | 2020-12
Ano: | 2020
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.
Tipo: | Text
Idioma: | Inglês

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/

Editor: | Springer Science and Business Media LLC
Relação: | info:eu-repo/grantAgreement/EC/FP7/609102/EU//PRESTIGE
Formato: | application/pdf
Fonte: | Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2020-12 , Vol. 10 , N. 1 , P. 6144 (12p.)

Fonte:

info:eu-repo/semantics/openAccess

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