Abstract
Sediment trap samples and undisturbed cores of bottom sediment were obtained during spring and summer from a 350-m-deep site in the Laurentian Trough, Gulf of St. Lawrence, and used to determine the flux of organic carbon to the sediment surface, and oxygen and organic carbon concentration profiles close to the sediment-water interface. Oxygen uptake rates by the sediments, calculated from micro-electrode profiles and a one-dimensional molecular diffusion transport model, can only account for 20% of the organic carbon that is mineralized in the sediment. Mechanisms other than molecular diffusion must dominate the transport of oxygen across the sediment-water interface in these deep coastal sediments.
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