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Particulate organic matter (POM) plays a significant role in nutrient cycle in waters by decomposition and settling process. In this study, the decomposition and settling characteristics of POM sampled in the head of Osaka Bay are investigated in laboratory experiments. As a result, decomposition and settling rate were formulated, respectively. Furthermore, based on their experimental results, we make an analysis to clarify nutrient vertical transport by POM using 1D vertical diffusion model. The calculation result showed that POM generated in surface layer was decomposed (or dissolved) or sink into sea bottom in 10 days, and about 32.1 %, 58.0 % and 29.9 % of N, P and Si, respectively, in the settling particle were regenerated in the water column.

Vertical Nutrient Transport by Decomposition and Settling Process of POM in Osaka Bay