Modelling the global atmospheric transport and deposition of radionuclides from the Fukushima Dai-ichi nuclear accident
Modelling the global atmospheric transport and deposition of radionuclides from the Fukushima Dai-ichi nuclear accident
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DOI：
10.5194/acp-13-1425-2013
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发表时间：
2013-01-01
影响因子：
6.3
通讯作者：
Lelieveld, J.
中科院分区：
文献类型：
--
作者：
Christoudias, T.;Lelieveld, J.
我们模拟了福岛第一核电站事故释放的放射性核素的全球大气扩散和沉积。使用 EMAC 大气化学 - 大气环流模型，将环流动力学推向 ERA-中期再分析数据。我们应用了大约 0.5 度的纬度和经度分辨率 (T255)。该模型考虑了放射性同位素 I-131 和 Cs-137 的排放和传输，以及通过沉淀、颗粒沉降和干沉降的去除过程。此外，我们还模拟了Xe-133的释放，这是一种惰性气体，可以被视为污染空气的被动传输示踪剂。源术语基于 Chino 等人。 （2011）和斯托尔等人。 （2012）；尤其是 I-131 的排放估算具有高度的不确定性。计算出的浓度已与全面禁止核试验条约组织（CTBTO）的站观测结果进行了比较。我们计算出，福岛释放到大气中的放射性物质约有80%沉积到了太平洋中。日本大片有人居住的土地受到超过 40 kBqm(-2) 的污染。我们还估算了日本人接触的 Cs-137、Cs-134 和 I-131 的吸入剂量和 50 年剂量。
We modeled the global atmospheric dispersion and deposition of radionuclides released from the Fukushima Dai-ichi nuclear power plant accident. The EMAC atmospheric chemistry - general circulation model was used, with circulation dynamics nudged towards ERA-Interim reanalysis data. We applied a resolution of approximately 0.5 degrees in latitude and longitude (T255). The model accounts for emissions and transport of the radioactive isotopes I-131 and Cs-137, and removal processes through precipitation, particle sedimentation and dry deposition. In addition, we simulated the release of Xe-133, a noble gas that can be regarded as a passive transport tracer of contaminated air. The source terms are based on Chino et al. (2011) and Stohl et al. (2012); especially the emission estimates of I-131 are associated with a high degree of uncertainty. The calculated concentrations have been compared to station observations by the Comprehensive Nuclear-Test-Ban Treaty Organisation (CTBTO). We calculated that about 80% of the radioactivity from Fukushima which was released to the atmosphere deposited into the Pacific Ocean. In Japan a large inhabited land area was contaminated by more than 40 kBqm(-2). We also estimated the inhalation and 50-year dose by Cs-137, Cs-134 and I-131 to which the people in Japan are exposed.