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	Provedor de dados ArchiMer (2) Autor Massias, D (2) Bertrand, P (1) Disnar, Jr (1) Giraud, X (1) Huc, Ay (1) Lallier-verges, E (1) Lansard, B (1) Pedersen, Tf (1) Pierre, C (1) Rabouille, C (1) Schneider, R (1) Shimmield, G (1) Tribovillard, N (1) Venec-peyre, Mt (1) Villanueva, J (1) Mais... Palavra-chave Biogeochemistry (1) Biogéochimie (1) Carbon cycle (1) Coastal sediment (1) Coastal upwelling (1) Cycle du carbone (1) Deep-sea sediments (1) In situ micro-electrodes (1) Micro-électrodes in situ (1) Oxygen (1) Oxygène (1) Petroleum source rocks (1) Quaternary climate (1) Southwestern African Margin (1) Sédiment côtier (1) Mais... Tipo do documento Text (2) Ano 2003 (2) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Organic-rich sediments in ventilated deep-sea environments: Relationship to climate, sea level, and trophic changes ArchiMer Bertrand, P; Pedersen, Tf; Schneider, R; Shimmield, G; Lallier-verges, E; Disnar, Jr; Massias, D; Villanueva, J; Tribovillard, N; Huc, Ay; Giraud, X; Pierre, C; Venec-peyre, Mt. Sediments on the Namibian Margin in the SE Atlantic between water depths of similar to1000 and similar to3600 m are highly enriched in hydrocarbon-prone organic matter. Such sedimentation has occurred for more than 2 million years and is geographically distributed over hundreds of kilometers along the margin, so that the sediments of this region contain a huge concentrated stock of organic carbon. It is shown here that most of the variability in organic content is due to relative dilution by buried carbonates. This reflects both export productivity and diagenetic dissolution, not differences in either water column or bottom water anoxia and related enhanced preservation of organic matter. These observations offer a new mechanism for the formation of... Tipo: Text Palavras-chave: Petroleum source rocks; Coastal upwelling; Deep-sea sediments; Quaternary climate; Southwestern African Margin. Ano: 2003 URL: https://archimer.ifremer.fr/doc/00224/33553/31977.pdf Variability in benthic oxygen fluxes during the winter-spring transition in coastal sediments: an estimation by in situ micro-electrodes and laboratory mini-electrodes ArchiMer Lansard, B; Rabouille, C; Massias, D. Two expeditions were achieved at the winter-spring transition in the Golfe de Fos (Mediterranean Sea) at a site situated at 21 m depth. An in situ autonomous oxygen profiler and laboratory oxygen mini-electrodes were used to measure the oxygen distribution in the sediments and calculate the diffusive oxygen fluxes. Clearer waters during the second expedition promoted a rapid shift from a net heterotrophic environment to a photosynthesis-dominated sediment. The diffusive exchange fluxes of oxygen through the sediment-water interface varied from an average consumption of 5.3 mmol m(-2) d(-1) (February) to a net production of 12 mmol m(-2) d(-1) (March). At both periods, a large spatial heterogeneity was recorded by the different electrodes, with a larger... Tipo: Text Palavras-chave: Oxygène; Micro-électrodes in situ; Biogéochimie; Cycle du carbone; Sédiment côtier; Oxygen; In situ micro-electrodes; Biogeochemistry; Carbon cycle; Coastal sediment. Ano: 2003 URL: http://archimer.ifremer.fr/doc/00322/43272/43003.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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