Data/hora: 09/06/2024 11:40:10

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France

Título:

Le système des carbonates influencé par la diagenèse précoce dans les sédiments côtiers méditerranéens en lien avec l’acidification des océans

The carbonate system driven by early diagenesis in Mediterranean coastal sediments in relation to ocean acidification

Autores: | Rassmann, Jens.
Data: | 2016-11-28
Ano: | 2016
Palavras-chave: | Carbonate system; Early diagenesis; Mineralization; Pelagic-bentic fluxes; Rhone prodelta; Ocean acidification.
Resumo: | Continental shelves are key regions for the global carbon cycle and particularly exposed to ocean acidification. A large part of organic matter (OM) of continental and marine origin is mineralized in estuarine sediments following oxic and anoxic pathways. This mineralization produces dissolved inorganic carbon (DIC) leading to acidification of the bottom waters. Anoxic mineralization can produce total alkalinity (TA) that can contribute to buffer bottom water pH and increase the CO2 storage capacity of seawater. Measurements in the sediments of the Rhone River prodelta showed that anoxic mineralization, especially sulfate reduction, are the major pathways of OM mineralization and create high DIC and TA fluxes. Land derived OM is mineralized close to the river mouth and marine OM takes over on the shelf. An acidification experiment with sediment cores from the bay of Villefranche evidenced that acidification causes carbonate dissolution at the sediment surface that buffers porewater pH
Tipo: | Text
Idioma: | Francês

Identificador:

https://archimer.ifremer.fr/doc/00659/77076/78398.pdf

https://archimer.ifremer.fr/doc/00659/77076/

Editor: | Université Paris saclay
Formato: | application/pdf

Fonte:

info:eu-repo/semantics/openAccess

restricted use