Various methods of presenting and mathematically describing particle size distribution are explained and evaluated. The hyperbolic distribution is found to be the most practical but the more complex characteristic vector analysis is the most sensitive to changes in the shape of the particle size distributions.nParticle size distribution, nutrient concentrations, temperature and other biological and hydrographic data were taken during two cruises off the Oregon coast. The first, in late July, 1973, was during a period of consistent upwelling-favorable winds. The second cruise, in August, 1974, was during a period of intermittently favorable winds. Thus the data presented represent several different upwelling situations. Two distinct vertical structures of suspended particulates and two types of particle size distributions were found, separated by a particle front. On the offshore side of the front, the structure was characterized by dominantly small particles and a subsurface maximum of suspended matter. On the other side of the front, the structure shows a particle maximum at or very near the surface with dominantly large particles.
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