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A model intercomparison of atmospheric Cs-137 concentrations from the Fukushima Daiichi Nuclear Power Plant accident, phase III : Simulation with an identical source term and meteorological field at 1-km resolution

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Title: A model intercomparison of atmospheric Cs-137 concentrations from the Fukushima Daiichi Nuclear Power Plant accident, phase III : Simulation with an identical source term and meteorological field at 1-km resolution
Authors: Sato, Yousuke Browse this author →KAKEN DB
Sekiyama, Tsuyoshi Thomas Browse this author
Fang, Sheng Browse this author
Kajino, Mizuo Browse this author
Querel, Arnaud Browse this author
Quelo, Denis Browse this author
Kondo, Hiroaki Browse this author
Terada, Hiroaki Browse this author
Kadowaki, Masanao Browse this author
Takigawa, Masayuki Browse this author
Morino, Yu Browse this author
Uchida, Junya Browse this author
Goto, Daisuke Browse this author
Yamazawa, Hiromi Browse this author
Keywords: Model intercomparison project for atmospheric(137)Cs
Atmospheric dispersion model
Radionuclide
Issue Date: Oct-2020
Publisher: Elsevier
Journal Title: Atmospheric Environment-X
Volume: 7
Start Page: 100086
Publisher DOI: 10.1016/j.aeaoa.2020.100086
Abstract: The third model intercomparison project (MIP) for investigating the atmospheric behavior of atmospheric caesium-137 (Cs-137) emitted from Fukushima Daiichi Nuclear Power Plant (FDNPP) (3rd FDNPP-MIP), Japan, in March 2011, was conducted. A finer horizontal grid spacing (1 km) was used than in the previous FDNPP-MIP (2nd FDNPP-MIP, Sato et al., 2018; 3 km) to evaluate the models' performance for high-concentration events measured near FDNPP. Nine of the models used in the 2nd FDNPP-MIP were also used in the 3rd FDNPP-MIP, and all models used identical source terms and meteorological fields. The performance of the models was evaluated through a comparison with observational data. Our analyses indicated that most of the observed high atmospheric Cs-137 concentrations (plumes) were reasonably well simulated by the models, and the good performance of some models improved the performance of the multimodel, highlighting the advantage of using a multimodel ensemble. The analyses also confirmed that the use of a finer grid resolution resulted in the meteorological field near FDNPP being better reproduced in the 3rd FDNPP-MIP, and the performance of the models was better than that of the 2nd FDNPP MIP. The good representation of the wind field resulted in the reasonable simulation of the narrow distribution of high deposition amount to the northwest of FDNPP and the reduction of the overestimation in deposition amount over the area to the south of FDNPP compared to the 2nd FDNPP MIP. In contrast, the performance of the models in simulating plumes observed over the Nakadori area, the northern part of Gunma, and the Tokyo Metropolitan Area (TMA) was slightly worse than in the 2nd FDNPP-MIP.
Rights: A model intercomparison of atmospheric 137Cs concentrations from the Fukushima Daiichi Nuclear Power Plant accident, phase III: Simulation with an identical source term and meteorological field at 1-km resolution
https://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/79678
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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