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Registros recuperados: 5
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ECOMARGE: Flux of particulate matter in the northwestern Mediterranean (golfe du Lion) ArchiMer
Heussner, S; Monaco, A; Fowler, S W; Buscail, R; Millot, C; Bojanowski, R.
As part of the multidisciplinary programme ECOMARGE (ECOsysteme des MARGEs continentales) an experiment to measure vertical flux of particles was carried out in the golfe du Lion off Banyuls-sur-Mer (Lacaze-Duthiers canyon) over a period of 17 days in autumn 1983. Sediment traps were deployed at depths of 100, 200 and 315 m in a water column 350 m deep. The trapped material appeared to consist of fine muddy sediment and numerous biogenic debris. Total mass flux increased linearly with depth from 4 g m super(-2) day super(-1) at 100 m to 13 g m super(-2) day super(-1) at 315 m. The lithogenic fraction was predominant at all depths (55 to 60% of total mass flux). Trap-collected fecal pellets were categorized by different shape classes and enumerated. Mass...
Tipo: Text
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00267/37837/35918.pdf
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Particulate matter and organic carbon budgets for the Gulf of Lions (NW Mediterranean) ArchiMer
Durrieu De Madron, X; Abassi, A; Heussner, S; Monaco, A; Aloisi, Jc; Radakovitch, O; Giresse, P; Buscail, R; Kerherve, P.
An analysis of sedimentological, sediment trap and hydrological data was performed to investigate the transport and fate of particulate matter in the Gulf of Lions. The sedimentological properties outline the major sedimentary units of the shelf (Rhone prodelta, mid-shelf mud belt, outer shelf) and slope. The geometry of these sedimentary units and the southwestwards increase of particulate fluxes on the slope highlight the influence of the general cyclonic circulation on the dispersion of land-derived particulate matter. Considering the known input and output terms, budgets of particulate matter and organic carbon in the Gulf of Lions are proposed. Inputs were river supply, atmospheric deposition and primary production; outputs were sediment burial and...
Tipo: Text Palavras-chave: Méditerranée; Golfe du Lion; Sédiment; Flux; Bilans de masse et de carbone organique; Mediterranean Sea; Gulf of Lions; Sediment; Flux; Organic carbon and mass budgets.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00301/41210/40366.pdf
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Seasonal variations of downward particle fluxes in front of a reef pass (Moorea Island, French Polynesia) ArchiMer
Schrimm, M; Heussner, S; Buscail, R.
Downward particle fluxes off the Taotoi Pass, a typical Polynesian lagoon pass, have been measured over an annual cycle by means of an array of three mooring lines deployed at 40 m depth on the external sandy plain seawards of the Tiahura reef. Each line was equipped with two hand-operated sediment traps located 1.5 and 10 m above the bottom. During the 1-year survey, the traps were deployed for seven periods of 2-3 weeks. One line equipped with an automated trap was further deployed at 400 m depth on the deep fore-reef slope to collect deep settling particles over two consecutive 6-month periods. For all periods investigated, fluxes on the external plain were highest in front of the pass, and decreased by half on either side (up- and downstream with...
Tipo: Text Palavras-chave: Flux particulaire; Exportation de carbone; Récif corallien; Carbone organique; Carbonate; Particle flux; Carbon export; Coral reefs; Organic carbon; Carbonate.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00322/43320/42934.pdf
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Stable isotopes (C-13/C-12 and N-15/N-14) in settling organic matter of the northwestern Mediterranean Sea: biogeochemical implications ArchiMer
Kerherve, P; Minagawa, M; Heussner, S; Monaco, A.
Within the framework of the High Frequency Flux (HFF) experiment (MATER programme), time-series sediment traps have been deployed for two months on the continental slope off Marseilles to measure downward particle fluxes at a high frequency sampling rate (two and six days). Combined isotopic analyses of carbon and nitrogen have been performed on selected samples. Both isotopic tracers have been used for the first time on organic material of the Mediterranean Sea (Gulf of Lions) to determine the main biological sources and to address the biogeochemical processes that affected this material. Settling particles were characterised by very low values of delta N-15 (near 0 parts per thousand) and delta C-13 (near -24.5 parts per thousand) that indicate the...
Tipo: Text Palavras-chave: Isotopes stables; Traceurs isotopiques; Particules en sédimentation; Fixation d’azote; Golfe du Lion; Stable isotopes; Isotopic tracers; Settling particles; Nitrogen fixation; Gulf of Lions.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00289/40019/38609.pdf
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Unusual Po-210/Pb-210 ratios in the surface water of the Gulf of Lions ArchiMer
Radakovitch, O; Cherry, Rd; Heyraud, M; Heussner, S.
Concentrations of Po-210 and Pb-210 have been measured in sea water collected in the Grand Rhone Canyon. Concentrations of Pb-210 are at similar levels to those found in other Mediterranean seawater samples, and are at the levels which would be expected in comparison with global sea water data. The same applies to the Po-210 concentrations in samples from below 100 m depth. Surface samples from above 100 m have Po-210 at levels rather higher than expected, and their Po-210/Pb-210 ratios are about 1 or more as compared with the usual open ocean ratio of about 0.5. These data can be interpreted as indicating another source of supply of Po-210 to the surface layer in addition to the normal atmospheric input. We suggest that an episodic advective particulate...
Tipo: Text Palavras-chave: Enlèvement; Mer Méditerranée; Bilan de radioélément; Temps de résidence; Scavenging; Mediterranean Sea; Radionuclide budget; Residence time.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43668/43202.pdf
Registros recuperados: 5
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