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To understand the flow fields in the Ocean is very important. In a peculiarly, it is gradually found to that Kuroshio's meander and temperature fluctuations in the Ocean affect the climate change of all the world included in Japan. We attempt to reproduce the Pacific Ocean flow fields to use a data assimilation system. The calculated flow fields also appear to be quite good and agree reasonably well with surface drifter observations calculated by Y.Michida. And the coefficient of correlation is r=0.74 in the zonal component. And we calculate the concentration of radionuclides (Cs-137, Sr-90, Pu-239/240) in the Pacific Ocean to use flow fields that is estimated by a data assimilation system. And this analysis estimates not only the flow fields but also the prediction of diffusion that is relevant to nuclear energy plant troubles and the evaluation of substances that is caused by atomic submarines troubles. Results of the concentration of radionuclides (Cs-137, Sr-90) in the Pacific Ocean are very good, compared with observation values (HAMdatabase). So we can prove the reproducibility of the flow fields in the mid-depth deeper.

CALCULATIONS OF THE CONCENTRATION OF RADIONUCLIDES (Cs-137, Sr-90, Pu-239/240) IN THE PACIFIC OCEAN