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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Volume 10, issue 4
Biogeosciences, 10, 2349-2363, 2013
https://doi.org/10.5194/bg-10-2349-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Impacts of the Fukushima nuclear power plant discharges on...

Biogeosciences, 10, 2349-2363, 2013
https://doi.org/10.5194/bg-10-2349-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 09 Apr 2013

Research article | 09 Apr 2013

Inverse estimation of source parameters of oceanic radioactivity dispersion models associated with the Fukushima accident

Y. Miyazawa, Y. Masumoto, S. M. Varlamov, T. Miyama, M. Takigawa, M. Honda, and T. Saino Y. Miyazawa et al.
  • Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama, Kanagawa, Japan

Abstract. With combined use of the ocean–atmosphere simulation models and field observation data, we evaluate the parameters associated with the total caesium-137 amounts of the direct release into the ocean and atmospheric deposition over the western North Pacific caused by the accident of Fukushima Daiichi nuclear power plant (FNPP) that occurred in March 2011. The Green's function approach is adopted for the estimation of two parameters determining the total emission amounts for the period from 12 March to 6 May 2011. It is confirmed that the validity of the estimation depends on the simulation skill near FNPP. The total amount of the direct release is estimated as 5.5–5.9 × 1015 Bq, while that of the atmospheric deposition is estimated as 5.5–9.7 × 1015 Bq, which indicates broader range of the estimate than that of the direct release owing to uncertainty of the dispersion widely spread over the western North Pacific.

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