Abstract
The chemical composition of suspended particulate material (SPM) in the Tamar Estuary and its response to tidal sediment resuspension at the turbidity maximum have been investigated. The results discriminate four regions: (1) the outer estuary where spatial changes in the composition of SPM reflect the dispersal of estuarine particles modified by in situ generation of organic particles, (2) the middle estuary where the composition of SPM is mainly determined by hydrodynamic mixing although there is some evidence of in situ chemical reactivity, (3) the upper estuary where sharply distinct and temporally variable SPM compositions are centred at the turbidity maximum; these are largely the result of particle-selective accumulation, sedimentation and resuspension processes rather than of local particle-water chemical exchanges, and (4) the fluvial estuary where the SPM composition reflects the influx of riverine particles.
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