Data/hora: 09/06/2024 00:52:20

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Modeling biogeochemical processes in sediments from the Rhone River prodelta area (NW Mediterranean Sea)
Autores: | Pastor, L.; Cathalot, C.; Deflandre, B.; Viollier, E.; Soetaert, K.; Meysman, F. J. R.; Ulses, C.; Metzger, E.; Rabouille, C.
Data: | 2011-05-27
Ano: | 2011
Resumo: | In situ oxygen microprofiles, sediment organic carbon content, and pore-water concentrations of nitrate, ammonium, iron, manganese, and sulfides obtained in sediments from the Rhone River prodelta and its adjacent continental shelf were used to constrain a numerical diagenetic model. Results showed that (1) the organic matter from the Rhone River is composed of a fraction of fresh material associated to high first-order degradation rate constants (11-33 yr(-1)); (2) the burial efficiency (burial/input ratio) in the Rh boolean AND one prodelta (within 3 km of the river outlet) can be up to 80 %, and decreases to similar to 20% on the adjacent continental shelf 10-15 km further offshore; (3) there is a large contribution of anoxic processes to total mineralization in sediments near the river mouth, certainly due to large inputs of fresh organic material combined with high sedimentation rates; (4) diagenetic by-products originally produced during anoxic organic matter mineralization are almost entirely precipitated (&gt; 97 %) and buried in the sediment, which leads to (5) a low contribution of the re-oxidation of reduced products to total oxygen consumption. Consequently, total carbon mineralization rates as based on oxygen consumption rates and using Redfield stoichiometry can be largely underestimated in such River-dominated Ocean Margins (RiOMar) environments.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00303/41423/40614.pdf

https://archimer.ifremer.fr/doc/00303/41423/71282.pdf

DOI:10.5194/bg-8-1351-2011

https://archimer.ifremer.fr/doc/00303/41423/

Editor: | Copernicus GmbH
Formato: | application/pdf
Fonte: | Biogeosciences (1726-4170) (Copernicus GmbH), 2011-05-27 , Vol. 8 , N. 5 , P. 1351-1366

Fonte:

Author(s) 2011. CC Attribution 3.0 License.

info:eu-repo/semantics/openAccess

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