Data/hora: 08/06/2024 15:25:32

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Contrasted release of insoluble elements (Fe, Al, rare earth elements, Th, Pa) after dust deposition in seawater: a tank experiment approach
Autores: | Roy-barman, Matthieu; Foliot, Lorna; Douville, Eric; Leblond, Nathalie; Gazeau, Frédéric; Bressac, Matthieu; Wagener, Thibaut; Ridame, Céline; Desboeufs, Karine; Guieu, Cécile.
Data: | 2020
Ano: | 2020
Resumo: | The release of lithogenic elements (which are often assumed to be insoluble) such as Aluminum (Al), Iron (Fe), Rare Earth Elements (REE), Thorium (Th) and Protactinium (Pa) by Saharan dust reaching Mediterranean seawater was studied through tank experiments over 3 to 4 days under controlled conditions including control without dust addition and dust seeding under present and future climate conditions (+3 °C and −0.3 pH unit). Unfiltered surface seawater from 3 oligotrophic regions (Tyrrhenian Sea, Ionian Sea and Algerian Basin) were used. The maximum dissolution fractions were low for all seeding experiments: less than 0.3 % for Fe, 1 % for 232Th and Al, about 2–5 % for REE and less than 6 % for Pa. Different behaviors were observed: dissolved Al increased until the end of the experiments, Fe did not dissolve significantly and Th and light REE were scavenged back on the particles after a fast initial release. The constant 230Th/232Th ratio during the scavenging phase suggests that there is little or no further dissolution after the initial Th release. Quite unexpectedly, comparison of present and future conditions indicates that changes in temperature and/or pH influence the release of thorium and REE in seawater, leading to a lower Th release and a higher light REE release under increased greenhouse conditions.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00642/75456/76274.pdf

https://archimer.ifremer.fr/doc/00642/75456/76275.pdf

https://archimer.ifremer.fr/doc/00642/75456/83425.pdf

https://archimer.ifremer.fr/doc/00642/75456/83426.pdf

DOI:10.5194/bg-2020-247

https://archimer.ifremer.fr/doc/00642/75456/

Editor: | Copernicus GmbH
Relação: | info:eu-repo/grantAgreement/EC/FP7/626734/EU//IRON-IC
Formato: | application/pdf
Fonte: | Biogeosciences (1726-4189) (Copernicus GmbH), 2020 , Vol. 18 , N. 8 , P. 2663-2678

Fonte:

info:eu-repo/semantics/openAccess

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