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Validation of the Short-Term Emergency Assessment system of Marine Environmental Radioactivity (STEAMER)

Kawamura, Hideyuki  ; Kobayashi, Takuya ; Kamidaira, Yuki   

This study aims to validate accuracies of forecast of the Short-Term Emergency Assessment system of Marine Environmental Radioactivity (STEAMER) developed at JAEA by using forecast and reanalysis ocean current data. Oceanic dispersion simulations were carried out in the northwestern Pacific Ocean for 30 days from first day of every month between 2015 and 2017. It was assumed that $$^{137}$$Cs was continuously released into the ocean from the Fukushima Daiichi Nuclear Power Plant. The released $$^{137}$$Cs was inclined to disperse by mesoscale eddies in the northern part and by the Kuroshio Extension in the southern part. The simulation results with forecast ocean current data were similar to those with reanalysis ocean current data in the early periods and differences between them were remarkable after that. The cause must be accuracies of variable ocean current in the coastal ocean rather than phenomena with long time scale such as the Kuroshio Extension.

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