A numerical investigation into the long-term behaviors of Fukushima-derived 137Cs in the ocean

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• 作者：Chang Zhao ; Gang Wang ; Fangli Qiao ; Guansuo Wang…
• 关键词：Fukushima accident ; 137Cs ; radioactivity model ; Kuroshio
• 刊名：Acta Oceanologica Sinica
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：34
• 期：12
• 页码：37-43
• 全文大小：1,519 KB
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• 作者单位：Chang Zhao (1)
  Gang Wang (1)
  Fangli Qiao (1)
  Guansuo Wang (1)
  Kyung-Tae Jung (2)
  Changshui Xia (1)
  
  1. Key Laboratory of Marine Science and Numerical Modeling, the First Institute of Oceanography, State Oceanic Administration, Qingdao o266061, China
  2. Korea Institute of Ocean Science and Technology, Ansan, 15627, Republic of Korea
  
• 刊物主题：Oceanography; Climatology; Ecology; Engineering Fluid Dynamics; Marine & Freshwater Sciences; Environmental Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-1099

文摘

The Fukushima nuclear accident in 2011 released large amounts of radionuclides, including 137Cs, 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-derived 137Cs in the ocean. The simulation shows that the plume of 137Cs would be rapidly transported eastward alongside the Kuroshio Current and its extensions. Contaminated waters with concentrations lower than 2 Bq/m3 would reach the west coast of North America 4 or 5 years after the accident. The 137Cs 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, the 137Cs 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. Keywords Fukushima accident 137Cs radioactivity model Kuroshio