Data/hora: 09/06/2024 11:38:06

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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