Data/hora: 13/06/2024 05:24:55

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

restricted use