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em Publishing Network for Geoscientific


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The sedimentation system of the bottom contour current over the continental slope of the Bear Island in the Norwegian Sea is considered. The nepheloid layer that provides high horizontal flux of sedimentary material represents the main source of matter for bottom sediments. Vertical particulate matter flux is largely formed in the nepheloid layer; flux from higher layers of the water column is insignificant. Horizontal and vertical fluxes of sedimentary matter show positive correlation. Matter flux from bottom sediment into the nepheloid layer and residence time of particles in the latter are estimated.

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This paper reports results of a geochemical study of suspended particulate matter and particle fluxes in the Norwegian Sea above the Bear Island slope. Concentrations of suspended particles and the main components of suspended matter were determined in the euphotic, intermediate (clean water), and bottom nepheloid layers. It was shown that biogenic components are predominant in water above the nepheloid layer, whereas suspended matter of the nepheloid layer is formed by resuspension of lithogenic components of bottom sediments. Chemical compositions of suspended matter and material collected in sediment traps are identical.