Chinese Science Bulletin

, Volume 57, Issue 26, pp 3518–3524 | Cite as

Numerical study and prediction of nuclear contaminant transport from Fukushima Daiichi nuclear power plant in the North Pacific Ocean

  • Hui Wang
  • ZhaoYi Wang
  • XueMing Zhu
  • DaKui Wang
  • GuiMei Liu
Open Access
Article Oceanology

Abstract

On March 11, 2011, a large earthquake and subsequent tsunami near the east coast of Japan destroyed the Fukushima Daiichi nuclear power plant (FD-NPP), causing a massive release of nuclear contaminants. In this paper, a Pacific basin-wide physical dispersion model is developed and used to investigate the transport of nuclear contaminants. The Pacific circulation model, based on the Regional Ocean Modeling System (ROMS), is forced with air-sea flux climatology derived from COADS (the Comprehensive Ocean-Atmosphere Data Set). It is shown that ocean current dominates nuclear contaminant transport. Following the Kuroshio Extension and North Pacific Current, nuclear contaminants at the surface will move eastward in the Pacific as far as 140°W, thereafter dividing into two branches. For the south branch, nuclear contaminants will be transported westward by the equatorial current, and can reach the Philippines after 10 years’ time. In contrast, the north branch will arrive at the American west coast and then migrate to the Bering Sea. At 200 m water depth, part of the nuclear materials will move southwestward along with deep ocean circulation, which could potentially reach the east coast of Taiwan. The other part will move to the west coast of America and separate into two branches. One will move northward along the west coast of Alaska, while the other will travel southward to the Hawaiian Islands. The transport of radiation contaminants below 500 m is slow, and will primarily remain in the central Pacific. The physical dispersion model results show that high concentrations of the radioactive isotope cesium-137 (137Cs) will move eastward and reach the central Pacific and west coast of North America in two and eight years, respectively. The sea areas influenced by the nuclear contaminants continue to expand, while peak concentrations decrease in the North Pacific.

Keywords

regional ocean model nuclear contaminants transport prediction 137Cs 

References

  1. 1.
    Chino M, Nakayama H, Nagai H, et al. Preliminary estimation of release amounts of 131I and 137Cs accidentally discharged from the Fukushima Daiichi nuclear power plant into the atmosphere. J Nucl Sci Technol, 2011, 48: 1129–1134CrossRefGoogle Scholar
  2. 2.
    Butler D. Radioactivity spreads in Japan. Nature, 2011, 471: 555–556CrossRefGoogle Scholar
  3. 3.
    Yasunari T J, Stohl A, Hayano R S, et al. Cesium-137 deposition and contamination of Japanese soils due to the Fukushima nuclear accident. Proc Natl Acad Sci USA, 2011, 108: 19530–19534CrossRefGoogle Scholar
  4. 4.
    Bowyer T W, Biegalski S R, Cooper M, et al. Elevated radioxenon detected remotely following the Fukushima nuclear accident. J Environ Radioact, 2011, 102: 681–687CrossRefGoogle Scholar
  5. 5.
    Masson O, Baeza A, Bieringer J, et al. Tracking of airborne radionuclides from the damaged Fukushima Dai-lchi nuclear reactors by European Networks. Environ Sci Technol, 2011, 45: 7670–7677CrossRefGoogle Scholar
  6. 6.
    Qiao F L, Wang G S, Zhao W, et al. Predicting the spread of nuclear radiation from the damaged Fukushima Nuclear Power Plant. Chin Sci Bull, 2011, 56: 1890–1896CrossRefGoogle Scholar
  7. 7.
    Yutaka K. Monitoring of aerosols in Tsukuba after Fukushima Nuclear Power Plant incident in 2011. J Environ Radioact, 2011, doi: 10.1016/j.jenvrad.2011.10.011Google Scholar
  8. 8.
    Stohl A, Seibert P, Wotawa G, et al. Xenon-133 and caesium-137 releases intothe atmosphere from the Fukushima Dai-ichi nuclear power plant: determination of the source term, atmospheric dispersion, and deposition. Atmos Chem Phys, 2011,11: 28319–28394CrossRefGoogle Scholar
  9. 9.
    Morino Y, Ohara T, Nishizawa M. Atmospheric behavior, deposition, and budget of radioactive materials from the Fukushima Daiichi nuclear power plant in March 2011. Geophys Res Lett, 2011, 38: L00G11CrossRefGoogle Scholar
  10. 10.
    Fang G H, Wei Z X, Wang Y G, et al. An extended variable-grid global ocean circulation model and its preliminary results of the equatorial Pavific Circulation (in Chinese). Acta Oceanol Sin, 2004, 23: 23–30Google Scholar
  11. 11.
    Xu Y F, Li Y C, Zhao L, et al. A basin-wide ocean general circulation model of the Pacific Ocean and its simulation results (in Chinese). Chin J Atmos Sci, 2006, 30: 927–938Google Scholar
  12. 12.
    Mo H E, Yu Y Q, Liu H L, et al. Preliminary results from a high-resolution Pacific-Indian basin-wide ocean general circulation model (in Chinese). J Trop Ocean, 2009, 28: 56–65Google Scholar
  13. 13.
    Cai Y, Wang Z G. Simulation of Pacific Ocean Circulation based on global warming from 1960 to 1999. Mar Sci Bull, 2010, 12: 10–15Google Scholar
  14. 14.
    Tsumune D, Tsubono T, Aoyama M, et al. Distribution of oceanic Cs137 from the Fukushima Dai-ichi Nuclear Power Plant simulated numerically by a regional ocean model. J Environ Radioact, 2011, doi: 10.1016/j.jenvrad.2011.10.007Google Scholar
  15. 15.
    Malcolm J, Roberts A, Clayton M, et al. Impact of resolution on the Tropical Circulation in a matrix of coupled models. J Clim, 2009, 22: 2541–2556CrossRefGoogle Scholar
  16. 16.
    Shchepetkin A F, McWilliams J C. The Regional Ocean Modeling System (ROMS): A split-explicit, free-surface, topography following coordinates oceanic model. Ocean Model, 2005, 9: 347–404CrossRefGoogle Scholar
  17. 17.
    Gates W L, Mitchell J F B, Boer G J, et al. Climate modeling, climate prediction and model validation. In: Climate Change 1992. The Supplementary Report to the IPCC Scientific Assessment. Cambridge: Cambrige University Press, 1992. 101–134Google Scholar
  18. 18.
    Zhao L, Xu Y F. Effect of boundary condition on A basinwide scale ocean general circulation model for the North Pacific (in Chinese). Adv Mar Sci, 2006, 24: 292–300Google Scholar
  19. 19.
    Gao S, Lü X Q. Simulation of sea surface temperature of equatorial and North Pacific using a hybrid coordinate ocean model (in Chinese). Adv Mar Sci, 2007, 25: 257–267Google Scholar
  20. 20.
    Xia C S, Qiao F L, Zhang Q H, et al. Numerical modeling of the quasi-global ocean circulation base on POM. J Hydrodyn, 2004, 16: 537–543Google Scholar
  21. 21.
    Kobashi, Kawamura. Variation of sea surface height at periods of 65–220 days in the subtropical gyre of the North Pacific. J Geophys Res, 2001, 106: 817–831CrossRefGoogle Scholar
  22. 22.
    Suga T, Kimio H. The subtropical mode water circulation in the North Pacific. J Phys Oceanogr, 1995, 25: 958–970CrossRefGoogle Scholar
  23. 23.
    Liu Q Y, Hu H B. A subsurface pathway for low potential vorticity transport from the central North Pacific toward Taiwan Island. Geophys Res Lett, 2007, 34: L12710CrossRefGoogle Scholar

Copyright information

© The Author(s) 2012

Authors and Affiliations

  • Hui Wang
    • 1
  • ZhaoYi Wang
    • 1
  • XueMing Zhu
    • 1
  • DaKui Wang
    • 1
  • GuiMei Liu
    • 1
  1. 1.Key Laboratory of Research on Marine Hazards ForecastingNational Marine Environmental Forecasting CenterBeijingChina

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