Data/hora: 15/06/2024 12:13:14

Provedor de dados: | 5
País: | France
Título: | Variability in benthic oxygen fluxes during the winter-spring transition in coastal sediments: an estimation by in situ micro-electrodes and laboratory mini-electrodes
Autores: | Lansard, B; Rabouille, C; Massias, D.
Data: | 2003-06
Ano: | 2003
Palavras-chave: | Oxygène; Micro-électrodes in situ; Biogéochimie; Cycle du carbone; Sédiment côtier; Oxygen; In situ micro-electrodes; Biogeochemistry; Carbon cycle; Coastal sediment.
Resumo: | 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 difference between oxygen profiles when photosynthesis was active. This is probably indicative of a coupling between photosynthesis and respiration in hot spots located close to the photosynthetic organisms. The comparison between in situ micro-electrode profiles and laboratory mini-electrode measurements revealed a good agreement when respiration was dominant, but photosynthetic activity was not detected by the laboratory mini-electrode profiles.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00322/43272/43003.pdf

DOI:10.1016/S0399-1784(03)00013-6

http://archimer.ifremer.fr/doc/00322/43272/

Editor: | Gauthier-villars/editions Elsevier
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-villars/editions Elsevier), 2003-06 , Vol. 26 , N. 3 , P. 269-279

Fonte:

2003 Éditions scientifiques et médicales Elsevier SAS and Ifremer/CNRS/IRD. All rights reserved.

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