Consulta: subjectFacets:"Particles"
Registros recuperados: 5
Data/hora: 10/06/2024 06:30:20

Iron sources and dissolved-particulate interactions in the seawater of the Western Equatorial Pacific, iron isotope perspectives
Provedor de dados: 5
Autores: Labatut, M.; Lacan, F.; Pradoux, C.; Chmeleff, J.; Radic, A.; Murray, J. W.; Poitrasson, F.; Johansen, A. M.; Thil, F.
This work presents iron isotope data in the western equatorial Pacific. Marine aerosols and top core margin sediments display a slightly heavy Fe isotopic composition (Fe-56) of 0.330.11 (2SD) and 0.140.07, respectively. Samples reflecting the influence of Papua New Guinea runoff (Sepik River and Rabaul volcano water) are characterized by crustal values. In seawater, Fe is mainly supplied in the particulate form and is found with a Fe-56 between -0.49 and 0.34 +/- 0.07 parts per thousand. The particulate Fe seems to be brought mainly by runoff and transported across continental shelves and slopes. Aerosols are suspected to enrich the surface Vitiaz Strait waters, while hydrothermal activity likely enriched New Ireland waters. Dissolved Fe isotopic ratios...
Tipo: Text
Palavras-chave: Iron isotopes; Particles; Equatorial Pacific; Papua New Guinea; Seawater; GEOTRACES.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00290/40074/39162.pdf

Role of particle sorption properties in the behavior and speciation of trace metals in macrotidal estuaries: The cadmium example
Provedor de dados: 5
Autores: Gonzalez, Jean-louis; Thouvenin, Benedicte; Dange, Catherine; Chiffoleau, Jean-francois; Boutier, Bernard.
The role of particles in the fate and speciation of trace metals in macrotidal estuaries was studied using a surface complexation model (MOCO). Cadmium was selected as the target metal contaminant due to its reactivity in estuaries: cadmium behavior is mainly controlled by heterogeneous processes (sorption/desorption) related to salinity and suspended matter gradients.   Various scenarios of suspended matter distribution according to salinity were simulated. The impact of surface properties (specific surface area, density of surface sites, acido-basic properties, and complexation constant) was evaluated using data collected on particles from the Gironde, Loire, and Seine estuaries.   Our results show that particle surface properties, evaluated on the basis...
Tipo: Text
Palavras-chave: Turbidity maximum; Speciation; Sorption; Particles; Modeling; Macrotidal estuaries; Cadmium.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2005.pdf

Rôle des particules sur le comportement et la spéciation de métaux traces: exemple du cadmium
Provedor de dados: 5
Autores: Gonzalez, Jean-louis; Thouvenin, Benedicte; Dange, Catherine.
The role of particles in the fate and speciation of trace metals in macrotidal estuaries was studied using a surface complexation model (MOCO). Cadmium was selected as the target metal contaminant due to its reactivity in estuaries: cadmium behavior is mainly controlled by heterogeneous processes (sorption/desorption) related to salinity and suspended matter gradients.Various scenarios of suspended matter distribution according to salinity were simulated. The impact of surface properties (specific surface area, density of surface sites, acidity instrinsic properties and complexation constant) was evaluated using data collected on particles from the Gironde, Loire and Seine estuaries.
Tipo: Text
Palavras-chave: Particles; Speciation; Sorption/desorption; Cadmium; Modeling; Surface properties.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00480/59152/61781.pdf

Heterogeneity of sediments and settling particles in aerated ponds
Provedor de dados: 5
Autores: Kassila, Jawad; Hussenot, Jerome.
A study was conducted in seabass (Dicentrarchus labrax) and oyster (Crassostrea gigas) ponds to assess the levels of heterogeneity of sediments and settling particles. The intensity of sampling to estimate with high accuracy some characteristics will depend on the magnitude of the variation within the population under consideration. Several variables, such as total phosphate (Tot-P), total iron (Tot-Fe), total ammonium nitrogen (TAN), organic carbon (Org-C), total nitrogen (Tot-N) and P fractions were analysed during the rearing period. The box-and-whisker plots were used as graphical/statistical tools to visualize the descriptive statistical characteristics of the data. In the fish pond, the sediments have high concentrations of Tot-P, Tot-Fe and TAN in...
Tipo: Text
Palavras-chave: Sampling strategy; Resuspension; Sedimentation; Artificial aeration; Particles; Sediment.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1224.pdf

Plankton size distributions and trophic relations before and after the construction of the storm-surge barrier in the Oosterschelde estuary
Provedor de dados: 27
Autores: Tackx, M.L.M.; Herman, P.M.J.; Van Rijswijk, P.; Vink, M.; Bakker, C.
Phytoplankton and zooplankton biomass distributions were calculated on a carbon basis for the inland part of the Oosterschelde, in the period before (1983), during (1984, 1986) and after (1987, 1988) the construction of the storm-surge barrier. In all years studied, both phytoplankton and zooplankton distributions are very irregular, and little consistent patterns emerge. The data were used to test the model of Sheldon et al. (1977). The observed standing stock ratios of zooplankton to phytoplankton agree with the model predictions in 1983, and are slightly higher during the period 1984-1987. In 1988, the model predictions are very different from the observed values, because of important changes in the zooplankton species abundance occurring in this year.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Particles; Particles; Particles; Plankton; Size distribution; Spectra; Zooplankton; Netherlands.
Ano: 1994
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2675