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

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
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福岛第一核电站事故第三阶段大气 137Cs 浓度的模型比对:使用相同源项和 1 公里分辨率气象场进行模拟

DOI:
10.1016/j.aeaoa.2020.100086
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发表时间:
2020-10
影响因子:
--
通讯作者:
Hiromi Yamazawa
Hiromi Yamazawa
中科院分区:
--
文献类型:
--
作者:
Yousuke Sato;Tsuyoshi Thomas Sekiyama;Sheng Fang;Mizuo Kajino;Arnaud Quérel;Denis Quélo;Hiroaki Kondo;Hiroaki Terada;Masanao Kadowaki;Masayuki Takigawa;Yu Morino;Junya Uchida;Daisuke Goto;Hiromi Yamazawa

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2011年3月,日本福岛第一核电站(FDNPP)排放的铯-137(137 Cs)的大气行为研究开展了第三次模型比对项目(MIP)(3rd FDNPP-MIP)。使用比先前FDNPP-MIP(2nd FDNPP-MIP,Sato等人,2018年; 3公里),以评估模型在FDNPP附近测量的高浓度事件的性能。第二次FDNPP-MIP中使用的9个模式也用于第三次FDNPP-MIP,所有模式都使用相同的源项和气象场。通过与观测数据的比较,模型的性能进行了评估。我们的分析表明,大多数观测到的高atmospheric 137 Cs浓度(羽流)合理地很好地模拟模型,一些模型的良好性能提高了多模式的性能,突出了使用多模式集合的优势。分析还证实,使用更精细的网格分辨率导致FDNPP附近的气象场更好地再现在第三次FDNPP-MIP中,模式的性能优于第二次FDNPP MIP。风场的良好代表性导致了对FDNPP西北部高沉积量分布的合理模拟,以及与第二次FDNPP MIP相比,FDNPP南部地区沉积量的高估减少。相比之下,模型在模拟中取地区、群马北方地区和东京首都圈(TMA)上空观测到的羽流时的性能比第2次FDNPP-MIP稍差。
The third model intercomparison project (MIP) for investigating the atmospheric behavior of atmospheric caesium-137 (137Cs) 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 atmospheric137Cs 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.
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