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Ikeda, M. ., Hokkaido University, Kawasaki, Japan, mikeda@ees.hokudai.ac.jp


Radionuclide-polluted water flowed out of Fukushima-I in early April. Radionuclide also fell out from the atmosphere in March and spread much more widely than the water flow. The ocean simulation models were developed to reproduce current patterns and radionuclide distributions, under atmospheric forcing and river flows. For the coastal region, the models were applied to reproduce freshwater- and wind-driven coastal currents and nested with the offshore mesoscale features, which were updated with data assimilation. A systematic inter-comparison of these models (MIP) was useful for higher reliability of the simulations. The models were first verified against current meter data before the event. With the two kinds of radionuclide, the polluted water spread along the coast southward on the average with variations due to winds and was gradually taken away within the mesoscale eddies. In addition, low-level pollution spread along the Kuroshio Extension and also the general circulation for a few years. Even though the current patterns were reproduced consistently among the models, the radionuclide contents showed significant differences in the southern coastal region. The component in sediments was also estimated.

Session #:088
Date: 2/21/2012
Time: 15:15
Location: Ballroom E

Presentation is given by student: No