engleski

On correlation of fractal dimensions of marine particles with depth

Fractal dimension of marine particles/aggregates is determined from light-scattering data obtained fromin situmeasurements in various depths ranging from 10 to 800 m. Analysis of calculated fractal dimension data indicates a correlation of fractal dimension and depth for Drake Passage. The average fractal dimension changes from 2.9 ± 0.1 beneath the surface to 2.0 ± 0.1 at 800 m. This agrees with a decrease of turbulent energy dissipation rate with depth, indicating domination of shear coagulation for depths ≤ 400 m (Image= 2.7 ± 0.3) and coagulation due to a differential sedimentation at greater depths (Image= 2.1 ± 0.3). No correlation was found between depth and fractal dimension for the Peru upwelling area. The average fractal dimension 2.8 ± 0.3 indicates that the shear coagulation is the dominant process throughout the water column in the upwelling area.

light scattering; fractal dimension; marine aggregate; aggregation; seawater

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