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Registros recuperados: 9
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Etude des sources d'alimentation potentielles des larves de l'huître perlière à l'échelle d'un lagon des Tuamotu, Ahe (Polynésie Française) ArchiMer
Mazzella, Audrey.
This work is part of a general study aiming at the modelling growth and dispersion of the larvae of Pinctada margaritifera in the lagoon of Ahe atoll (Tuamotu, French Polynesia). The general objective of this study is to set up a model coupling the growth and the dispersal of chlorophyll and particulate matter according to different spatial and temporal scales. Totally 1111 samples were taken in 12 stations from April 21st to May 28th, 2007. The speed and the direction of the wind bad a significant effect on the different parameters. The depth has not influence on the variations of the chlorophyll and the particulate matter that of their quality descriptors (proportion of cells lower than 2 µm, that of the phaeopigments and the organic matter). A...
Tipo: Text Palavras-chave: Ahe; Collectage; Temporel; Spatial; Chlorophylle; Phéopigments; Matières en suspension; Matière minérale; Matière organique.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00426/53794/54709.pdf
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Hydrologie : des mesures sur l'eau ArchiMer
Guesdon, Stephane; Soletchnik, Patrick.
Ce poster présente les stratégies spatio temporelles de mesures hydrologiques dans les pertuis charentais; (1) la "basse fréquence", par prélèvements d'échantillons d'eau de mer et (2) la "haute fréquence", par mesure in situ à partir de sonde multi paramètres immergées. Les objectifs de ces réseaux sont la surveillance et la recherche. Un exemple de déssalure "furtive" est présenté en rivière Seudre
Tipo: Text Palavras-chave: Marennes Oléron Bassin; Nutriment; Oxygène dissous; Chlorophylle; Matières en suspension; Turbidité; Salinité; Température; Hydrologie.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/acte-4039.pdf
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Impact du barrage d'Arzal sur la qualité des eaux de l'estuaire et de la baie de la Vilaine ArchiMer
Merceron, Michel.
The Arzal dam upon the Vilaine estuary provokes an aggravation of a recurrent summer hypoxia of the bottom waters in the bay of Vilaine.
Tipo: Text Palavras-chave: Suspended sediments; Salinity; Coastal zone; Dam estuary; Oxygen depletion; Matières en suspension; Salinité; Zone côtière; Estuaire; Barrage; Anoxie.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/rapport-2658.pdf
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Incertitudes des méthodes d’évaluation « eaux littorales » : utilisation de modèles linéaires dynamiques pour l’évaluation des incertitudes des paramètres hydrologiques ArchiMer
Soudant, Dominique; Auby, Isabelle; Daniel, Anne.
L’incertitude associée à une mesure a pour origine d’une part la variabilité environnementale et d’autre part l’ensemble du processus d’acquisition depuis le prélèvement jusqu’à la saisie de la donnée dans une base. L’estimation de l’ensemble de cette variabilité est un exercice complexe à réaliser dans le cadre d’un plan d’expérience. En revanche, les longues séries temporelles de données présentent la caractéristique d’intégrer toutes les variabilités. L’analyse de ces séries en termes de signal et bruit doit permettre de quantifier l’amplitude des incertitudes. Toutefois, les séries temporelles d’observation présentent un ensemble de caractéristiques les rendant difficiles à analyser. Les modèles linaires dynamiques constituent une approche adaptée à...
Tipo: Text Palavras-chave: Incertitude; Température; Turbidité; Matières en suspension; Oxygène dissous; Nutriments; Modèle linaire dynamique; Bassin d’Arcachon; REPHY..
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00441/55306/56821.pdf
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Les polychlorobiphenyles ( PCB ) en Baie de Seine ArchiMer
Abarnou, Alain.
PCB contamination and i ts relationship wi th suspended particulate matter (SPM) have been studied in water from the Seine estuary and the baie de Seine, in July 1985 and February 1986. PCB chromatograms are very similar and characterize a chronic contamination. PCB concentrations vary from 2 ng/l in the marine zone up to 210 ng/l in the estuary. SPM and PCB concentrations are weIl correlated. Highest PCB concentrations are measured in February due to higher SPM inputs mainly made of finer particles.
Tipo: Text Palavras-chave: PCB; Seine; Fleuve; Estuaire; Baie; Matières en suspension; PCB; Seine; River; Estuary; Bay; Suspended particulate matter.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00138/24924/23020.pdf
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Nouvelle méthode de dosage de quelques métaux - traces dans les sédiments et les matières en suspension ArchiMer
Chiffoleau, Jean-francois; Truquet, Isabelle.
Des matières solides séchées sont minéralisées en bombe fermée par un mélange d'acide nitrique, d'acide chlorhydrique et d'acide fluorhydrique à environ 120 °C pendant 180 minutes. Cette attaque acide est totale et le minéralisat liquide obtenu est analysé pour sa teneur en métaux par absorption atomique avec ou sans flamme. C'est une méthode très sensible puisqu'elle permet de détecter dans des particules jusqu'à 0,35 % d'Al; 0,15 % de Fe, 0,1 mg/kg de Cd, 2 mg/kg de Co, 0,4 mg/kg de Cr, 2 mg/kg de Cu, 0,4 mg/kg de Mn, 2 mg/kg de Ni, 2 mg/kg de Pb, 0,1 mg/kg de Zn. La précision de cette méthode, sa reproductibilité ( de l'ordre de 7 % ) et sa facilité de mise en oeuvre en font une méthode de choix pour l'étude de faibles de quantité d'échantillons, comme...
Tipo: Text Palavras-chave: Analyse; Métaux-traces; Sédiments; Matières en suspension; Absorption atomique.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00140/25119/23228.pdf
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Observer les coccolithophores de l'espace ArchiMer
Perrot, Laurie.
Coccoliths, in cells or detached, from coccolithophores are calcite plates with highly backscattering signal.Coccolithophore blooms are visible from space and are currently quantified by Calcite algorithm fromNASA applied to Ocean Color data. Coccoliths impact also the Suspended Particulate Matters (SPM) product from Ifremer, well established in the Northwest european continental shelf. Although these algorithms are independent, they are based on the same basic concepts, but Ifremer algorithm is more adaptable and allows to link up with other particles than coccoliths, as the resuspended matters or aggregates.Coccolithophore blooms identification over 18 years, from bay of Biscay to South Irelands has been established by a spectral method, allowing to...
Tipo: Text Palavras-chave: Matières en suspension; Télédétection; Golfe de Gascogne; Coccolithophores; Blooms; Suspended Particulate Matters; Remote-sensing; Bay of Biscay.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00497/60914/64269.pdf
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Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling ArchiMer
Lafite, Robert; Shimwell, Susan; Grochowski, Nicolas; Dupont, Jacques; Nash, Linda; Salomon, Jean-claude; Cabioch, Louis; Collins, Michael; Gao, Shu.
Suspended Particulate Matter (SPM) concentrations at various levels within the water column, together with salinity and temperature, were measured using water samples collected from six stations across the Straits of Dover. The sampling programme covered a 16-month period, undertaken during 23 cruises. On the basis of the spatial variability in the concentrations, the water bodies are divided by several boundaries, controlled by tidal and wind conditions. Within the water column, SPM concentrations were higher near the sea bed than in the surface waters. Throughout the cross-section, maximum concentrations occurred adjacent to the coastlines. Temporal variability in the SPM concentration exists on daily and seasonal scales within the coastal waters (4.2 to...
Tipo: Text Palavras-chave: English Channel; Straits; Transport mechanisms; Flux; Suspended particulate matter; Manche; Détroit; Mécanismes de transport; Flux; Matières en suspension.
Ano: 2000 URL: https://archimer.ifremer.fr/doc/2000/publication-527.pdf
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Suspended sediments in a macrotidal estuary: comparison and use of different sensors ArchiMer
Lunven, Michel; Gentien, Patrick.
Measurements made using an in situ particle-sizer (PSA) were compared to those of an optical backscatter sensor (OBS) in a macrotidal estuary. Both estimate the total volume of particles. After comparison with dry weight of suspended matter sampled in the study area, the different measurements were converted into dry weight. In three different kinetic energy regimes, times series were coherent for most of the observations. Discrepancies of suspended sediment concentrations estimated by both sensors appeared under specific hydrodynamic conditions: they were related to occurrences of definite particle populations. Overestimations and underestimations of measurements by the instruments depend on the optical principles of the sensors (backscatter and...
Tipo: Text Palavras-chave: Particle size; Suspended particulate matter; Aggregates; Taille de particule; Matières en suspension; Agrégats.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-521.pdf
Registros recuperados: 9
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