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Sediment resuspension and its effects on the turnover of methane, oxygen and carbon dioxide

Resuspension of sediment often results in enhanced decomposition of organic material. This is mainly due to the sudden availability of nutrients and organic material from deeper sediment horizons, as well as the introduction of oxygen and other electron acceptors to sedimentary bacteria. Another explanation is the increase of the available surface area for bacterial colonization on particles injected into the water column (WAINRIGHT 1990). In shallow estuaries, sediments may contain large amounts of organic material and can rapidly become anoxic. In estuaries with low salinities, particularly, a major part of anaerobic decomposition is through methanogenesis. Sediments can be mixed and resuspended through the action of currents and waves and in more urbanized areas by the motion of ship propellers (PETTIBONE et al. 1996). Most studies on the resuspension of sediment have focused on issues of turbidity, siltation, and the transport and availability of sedimentary contaminants. However, the resuspension of undisturbed, largely anoxic muds has potentially profound and complex effects on sedimentary and near-bottom gas fluxes. For example, methane cycling may be strongly altered if aerobic methane oxidation is stimulated during sediment resuspension. This process may lessen CH, evolution to the atmosphere, but is also coupled to the carbonate cycle.