NOTE On Correlation of Fractal Dimension of Marine Particles with Depth
ciency (E ij Å 1), then the mechanism/size order is Brownian coagulation (for very small particles), shear, differential sedimentation, and settling Fractal dimension of marine particles/aggregates is determined (for largest particles) (4). However, collision functions calculated with from light-scattering data obtained from in situ measurements in contact efficiencies, which are size dependant (hence x 1), indicate that various depths ranging from 10 to 800 m. Analysis of calculated mechanism/size-range order depends on the turbulent energy dissipation fractal dimension data indicates a correlation of fractal dimension rate (5, 6).
and depth for Drake Passage. The average fractal dimension
For a high turbulent dissipation rate (e ¢ 10 02 cm 2 s 03 ), shear coagulation changes from 2.9 { 0.1 beneath the surface to 2.0 { 0.1 at 800 dominates over differential sedimentation at small and medium sizes (1- m. This agrees with a decrease of turbulent energy dissipation rate 50 mm), while at larger sizes these mechanisms are of the same order of with depth, indicating domination of shear coagulation for depths magnitude. For a lower turbulent dissipation rate, differential sedimentation °400 m (D V Å 2.7 { 0.3) and coagulation due to a differential is dominant over shear coagulation for all sizes. Hence, we may expect sedimentation at greater depths ( D V Å 2.1 { 0.3). No correlation that in the deep oceanic waters differential sedimentation dominates in all but very small size ranges, while at the surface, especially at higher turbulent was found between depth and fractal dimension for the Peru updissipation rates, shear coagulation would dominate in small-and mediumwelling area. The average fractal dimension 2.8 { 0.3 indicates size ranges. This should reflect itself in the fractal dimension of the aggrethat the shear coagulation is the dominant process throughout the gates. Hence, we expect to find a change in average fractal dimension of water column in the upwelling area. ᭧ 1998 Academic Press aggregates going from surface to depth.