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Journal Articles

Oceanic dispersion simulations of $$^{137}$$Cs released from the Fukushima Daiichi Nuclear Power Plant

Masumoto, Yukio*; Miyazawa, Yasumasa*; Tsumune, Daisuke*; Tsubono, Takaki*; Kobayashi, Takuya; Kawamura, Hideyuki; Estournel, C.*; Marsaleix, P.*; Lanerolle, L.*; Mehra, A.*; et al.

Elements, 8(3), p.207 - 212, 2012/06

 Times Cited Count:79 Percentile:92.15(Geochemistry & Geophysics)

Present status of oceanic dispersion simulations of cesium 137 ($$^{137}$$Cs) directly discharged from Fukushima Daiichi Nuclear Power Plant are reviewed using five model outputs and other available informations, focusing on estimations of discharged amount of $$^{137}$$Cs and subsequent dispersion in a region off Fukushima during March and April, 2011. Common aspects and discrepancies among the simulated results are described. While the discharged amount spreads from about 1 to 27 P Bq of $$^{137}$$Cs among the estimates, the values obtained from the five models indicate 2 to 4 P Bq. With these total amounts and time evolutions of the discharge rate, mimicking observed $$^{137}$$Cs concentration near FDNPP, as a source for the dispersion calculation, all the five models simulated the $$^{137}$$Cs dispersion in the ocean reasonably well corresponding to the observed distributions.

Oral presentation

Off-line tracer applications based on Global HYCOM simulations

Garraffo, Z.*; Kamenkovich, I.*; Kim, H.-C.*; Kawamura, Hideyuki; Mehra, A.*; Rivin, I.*

no journal, , 

Off-line tracer modeling is a powerful practical method to simulate tracer evolution using previously calculated velocity and density fields. The main advantage of this approach is in its computational efficiency, which permits extended simulations and multiple sensitivity runs. The off-line tracer model used for this work is based on the code originally developed for HYCOM by Rainer Bleck. It calculates the 3D mass transport from daily averaged velocities, as well as daily mean and instantaneous layer thicknesses. Current simulations are based on 1/12-degree HYCOM climatological runs. Examples of applications presented here include simulations of: (a) idealized tracers in the Southern Ocean; (b) radionuclides in the Pacific Ocean; (c) nutrients in the Pacific Ocean.

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