Consulta: creatorFacets:"Grenz, C"
Registros recuperados: 4
Data/hora: 08/06/2024 18:52:29

Nutrients and carbon budgets for the Gulf of Lion during the Moogli cruises
Provedor de dados: 5
Autores: Durrieu De Madron, X; Denis, L; Diaz, F; Garcia, N; Guieu, C; Grenz, C; Loye-pilot, Md; Ludwig, W; Moutin, T; Raimbault, P; Ridame, C.
Shelf-slope exchanges and budgets of organic and inorganic nutrients are calculated for the Gulf of Lion continental margin in the northwestern Mediterranean. Computations are based on data from three seasonal marine surveys performed in March 1998, June 1998 and January 1999 in the framework of the French Programme National d'Environnement Cotier. A Land-Ocean Interactions in the Coastal Zone type box model is used to calculate the advective exchanges between the shelf and the adjacent open sea and to estimate the budgets of non-conservative elements (DIP, DIN, DOP, DON, DOC, POC, PON, POP). These budgets consider river discharges, urban sewage supply, atmospheric deposition, and fluxes at the water-sediment and shelf-slope interfaces. Uncertainties on...
Tipo: Text
Palavras-chave: Mer Méditerranée; Echanges côte-large; Fonctionnement de l’écosystème; Cycle du carbone; Bilan de sels nutritifs; Mediterranean Sea; Shelf-slope exchanges; Ecosystem functioning; Carbon cycle; Nutrients budget.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00301/41236/40426.pdf

Trawling-induced resuspension and dispersal of muddy sediments and dissolved elements in the Gulf of Lion (NW Mediterranean)
Provedor de dados: 5
Autores: De Madron, X; Ferre, B; Le Corre, Gildas; Grenz, C; Conan, P; Pujo Pay, M; Buscail, R; Bodiot, O.
A dedicated trawling experiment was performed at three sites on the Gulf of Lion continental shelf, with the aim of assessing the resuspension of particulate and dissolved matter triggered by different types of trawls on muddy sediments. The different configurations were: (i) bottom trawl, with bobbin for ground rope (Rockhopper): (ii) bottom trawl, without bobbin (Medits); and (iii) pelagic trawl, towed at 1 and 10m above the seabed.   The plumes of resuspended sediment were measured using the acoustic backscattered intensity, from a towed ADCP. Concomitant profiles of particle size-distribution, light transmission and water samples were collected, outside and inside the plumes. The analysis of the data enabled derivation of the major physical and...
Tipo: Text
Palavras-chave: Northwestern Mediterranean Sea; Gulf of Lion; Suspended particulate matter; Sediment resuspension; Cohesive sediments; Bottom trawling; Coastal fisheries.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1355.pdf

Spatial variability in oxygen and nutrient fluxes at the sediment-water interface on the continental shelf in the Gulf of Lions (NW Mediterranean)
Provedor de dados: 5
Autores: Denis, L; Grenz, C.
The spatial variability of oxygen and dissolved nutrient exchanges across the sediment-water interface was studied on the continental shelf in the Gulf of Lions (NW Mediterranean Sea). Replicate sediment cores were sampled at nine stations (64-162 m depth) along two lines parallel to the coast during two cruises in March and June 1998. Sediment-water exchanges were measured using the core incubation technique. Surficial sediments, bottom water and interstitial water characteristics were also described. Fluxes of oxygen (3.72-8.83 mmol m(-2) d(-1)), nitrate (0.026-0.283 mmol m(-2) d(-1)), ammonium (-0.022 to 0.204 mmol m(-2) d(-1)), nitrite (-0.034 to 0.002 mmol m(-2) d(-1)), phosphate (-0.007 to 0.029 mmol m(-2) d(-1)) and silicate (0.504-1.656 mmol m(-2)...
Tipo: Text
Palavras-chave: Flux à l’interface eau-sédiment; Sels nutritifs; Minéralisation; Méditerranée nord-occidentale; Plateau continental; Sediment-water fluxes; Nutrients; Mineralization processes; NW Mediterranean; Continental shelf.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00321/43263/42994.pdf

Measurement of benthic nutrient fluxes in mediterranean shellfish farms - a methodological approach
Provedor de dados: 5
Autores: Grenz, C; Plantecuny, Mr; Plante, R; Alliot, E; Baudinet, D; Berland, B.
Benthic chambers were used to investigate fluctuations in nutrient fluxes and oxygen changes when comparing two benthic biota. Muddy sediments located under mussel-cultivation ropes were compared with a station outside the mussels' influence. Biodeposition from the mussels results in a drastic increase in the nutrient fluxes. A standard procedure is established in order to give reliable comparisons between stations and seasons: as a rule it should include six-hour periods of incubation with sampling intervals of two hours and at least four benthic chambers - preferably six - at each station.
Tipo: Text
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00102/21373/18973.pdf