Organic matter transport across a macrotidal estuary grandient: the Seine estuary,Fance |
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Authors: | Hervé Texier Robert Lafite Jean Paul Dupont Virginie Firmin François Gadel Léon Serve Bruno Charriere |
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Institution: | (1) Laboratoire de Géologie Marine (Chimie Marine), Université de Caen, 14032 Caen Cedex, France;(2) Département de Géologie, Université de Rouen, BP 118, 76134 Mont-Saint-Aignan Cedex, France;(3) Department of Oceanography, University of Southampton, S095NH Southampton, UK;(4) Laboratoire de Sédimentologie et Géochimie Marines, Université de Perpignan, 66860 Perpignan, France;(5) Laboratoire de Biologie Végétale, Université de Perpignan, 66860 Perpignan, France |
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Abstract: | The macrotidal Seine estuary receives mineral and organic fluxes from a strongly industrialized basin. Upstream-downstream
analysis of POC, polysaccharides and phenolic compounds in the particulate fraction indicated clearly the continental inflow.
Within the maximum turbidity zone, the organic matter/suspended particulate matter ratio is lower than elsewhere which results
from the dilution effect. Particulate tracers were quantified using grain size analysis and S.E.M. techniques. These sedimentary
data defined the ratio of marine to continental particulate flux and mechanisms controlling the suspended particulate matter
load within the estuarine mixing zone (resuspension, frontal enrichment and turbulent mixing processes). Organic parameters
confirm the data on the mineral matter and were used to distinguish between the marine and continental inputs, from the upstream
and downstream samples. Between the two endmembers, variations in organic parameters were controlled mainly by the hydrodynamics
in the estuarine zone, rather than by salinity changes. |
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Keywords: | organic matter phenolic compounds suspended particulate matter estuarine gradient macrotidal Seine |
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