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Miyazawa, Y. ., JAMSTEC, Yokohama, Japan, miyazawa@jamstec.go.jp
Masumoto, Y. ., JAMSTEC, Yokohama, Japan, masumoto@jamstec.go.jp
Varlamov, S. M., JAMSTEC, Yokohama, Japan, vsm@jamstec.go.jp
Miyama, T. ., JAMSTEC, Yokohama, Japan, tmiyama@jamstec.go.jp
Takigawa, M. ., JAMSTEC, Yokohama, Japan, takigawa@jamstec.go.jp
Honda, M. ., JAMSTEC, Yokosuka, Japan, hondam@jamstec.go.jp


We simulate radionuclide distribution in the ocean due to direct emission from the Fukushima Daiichi nuclear power plant for the period from 21 March to 6 May 2011. Dispersion of Caesium-137 is modeled by a transport equation with advection and diffusion by three dimensional ocean current. The ocean current data are provided from a tide-resolving ocean general circulation model with horizontal resolution of 1/36 degree covering the Japan coastal ocean. Results show that the radionuclide flows first along the coast to the south. It expands from the shelf region into open ocean in April mostly by the wind-forced ocean currents and, then, farther transported southeastward along the Kuroshio Extension front in May. Sensitivity experiments demonstrate that the wind driven currents facilitate the north-south extension of the radionuclide distribution through the repeated generations of the shelf waves. To examine wider scale dispersion, we perform another type of simulation using a basin-scale model with horizontal resolution of 1/12 degree with an additional input of Caesium-137 by atmospheric deposition, and validate the results using in-situ observations obtained over the North Western Pacific.

Poster presentation

Session #:088
Date: 2/21/2012
Time: 10:30 - 16:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: B1003