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14,649,000 Yen (FY1995 4,956,000 Yen)
We compared ocean color remote sensing data and optical buoy data from the Japan Sea with results of a simple 1-dimensional physical-biological model. First, we observed three-months time-series of weather, vertical structure of temperature, and sea surface phytoplankton pigment concentration from a moored optical buoy system. The buoy system was developed by the National Space Developmental Agency of Japan and moored from August 25 to November 26, 1993, at the Japan Sea, off Hamada, Shimane. Solar radiation decreased and mixed layer developed during the three months, and sea surface phytoplankton pigments were highest at the early November.
We developed a coupled 1-dimensional turbulence-, optical-, primary production-, ecosystem-model with data set of the buoy. The turbulence model generally reproduced the development of mixed layer. Coupled optical-turbulence model indicates that the phytoplankton affects to the mixed layer dynamics and the heat balance. We used the coupled model with forcing of data from weather station to simulate one-year change of surface pigment concentration off Hamada detected by Coastal Zone Color Scanner. The model well reproduced the time changes of surface phytoplankton pigment concentrations. Autumn bloom was initiated with the introduction of nutrients by the development of mixed layer, and ended by the light limitation caused by deep mixing. On the other hand, spring bloom started with the warming of surface water with high nutrient concentration and ended with depletion of nutrients.
Ocean Color Remote Sensing, Optical Buoy, Physical-Biological Model, Chlorophyll, Phytoplankton