A numerical investigation into the long-term behaviors of Fukushima-derived Cs-137 in the ocean
A numerical investigation into the long-term behaviors of Fukushima-derived Cs-137 in the ocean
复制标题
对福岛衍生 Cs-137 在海洋中长期行为的数值研究
DOI：
10.1007/s13131-015-0775-8
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发表时间：
2015
影响因子：
1.4
通讯作者：
Xia Changshui
中科院分区：
文献类型：
--
作者：
Zhao Chang;Wang Gang;Qia Fangli;Wang Guansuo;Jung Kyung Tae;Xia Changshui
2011年的福岛核事故向太平洋释放了大量放射性核素，其中包括137cs。建立了水平网格间距为0.5°×0.5°、垂直层数为21层的准全球海洋放射性输运模型，研究了福岛137cs在海洋中的长期输运。模拟结果表明，137cs羽流将随着黑潮及其延伸迅速向东移动。浓度低于2 Bq/m3的受污染水体将在事故发生4 - 5年后到达北美西海岸。尽管137cs的浓度很低，但到2016年，它们会通过不同的洋流分支进入印度洋和南太平洋。与此同时，北太平洋西部137cs浓度随时间快速下降。到目前为止，高污染的水仍然停留在400米以上，没有迹象表明有明显渗透到更深层。
The Fukushima nuclear accident in 2011 released large amounts of radionuclides, including137Cs, into the Pacific Ocean. A quasi-global ocean radioactive transport model with horizontal grid spacing of 0.5°×0.5° and 21 vertical layers was thereafter established to study the long-term transport of the Fukushima-derived137Cs in the ocean. The simulation shows that the plume of137Cs would be rapidly transported eastward alongside the Kuroshio Current and its extensions. Contaminated waters with concentrations lower than 2 Bq/m3would reach the west coast of North America 4 or 5 years after the accident. The137Cs tends to be carried, despite its very low concentration, into the Indian and South Pacific Oceans by 2016 via various branches of ocean currents. Meanwhile, the137Cs concentrations in the western part of the North Pacific Ocean decrease rapidly with time. Up to now the highly contaminated waters have remained in the upper 400 m, showing no evidence of significant penetration to deeper layers.