A study of transport and impact strength of Fukushima nuclear pollutants in the north pacific surface
- 219 Downloads
Based on the statistics of surface drifter data of 1979–2011 and the simulation of nuclear pollutant particulate movements simulated using high quality ocean reanalysis surface current dataset, the transport pathways and impact strength of Fukushima nuclear pollutants in the North Pacific have been estimated. The particulates are used to increase the sampling size and enhance the representativeness of statistical results. The trajectories of the drifters and particulates are first examined to identify typical drifting pathways. The results show that there are three types of transport paths for nuclear pollutants at the surface: 1) most pollutant particles move eastward and are carried by the Kuroshio and Kuroshio-extension currents and reach the east side of the North Pacific after about 3.2–3.9 years; 2) some particles travel with the subtropical circulation branch and reach the east coast of China after about 1.6 years according to one drifter trajectory and about 3.6 years according to particulate trajectories; 3) a little of them travel with local, small scale circulations and reach the east coast of China after about 1.3–1.8 years. Based on the particulates, the impact strength of nuclear pollutants at these time scales can be estimated according to the temporal variations of relative concentration combined with the radioactive decay rate. For example, Cesium-137, carried by the strong North Pacific current, mainly accumulates in the eastern North Pacific and its impact strength is 4% of the initial level at the originating Fukushima area after 4 years. Due to local eddies, Cesium-137 in the western North Pacific is 1% of the initial pollutant level after 1.5 years and continuously increases to 3% after 4 years. The vertical movement of radioactive pollutants is not taken into account in the present study, and the estimation accuracy would be improved by considering three-dimensional flows.
Key wordsFukushima nuclear pollution ensemble estimation surface drifting buoy ocean reanalysis
Unable to display preview. Download preview PDF.
- Buck, E. H., Upton, H. F., and Folger, P., 2011. Effects of radiation from Fukushima Daiichi on the U.S. marine environment. Congressional Research Service (CRS) Report for Congress, R41751: 4.Google Scholar
- Li, Z. Q., Wu, B. Q., Yuan, Y. M., Bo, W. B., 2011. Drift-path Analysis of the Fukushima Nuclear Leakage Pollutant. Hydrographic Surveying and Charting, 31(4): 47–49.Google Scholar
- Liu, A. H., and Kuai, L. P., 2011. A review on radionuclides atmospheric dispersion modes. Journal of Meteorology and Environment, 27(4): 59–65Google Scholar
- Neumann, G., 1968. Ocean Currents. Elsevier Oceanographer Series, Elsevier Co., New York, 351pp.Google Scholar
- Tomczak, M., and Godfrey, J. S., 2001. Regional Oceanography: An Introduction. Elsevier Science Ltd., Oxford, UK, 110–120.Google Scholar
- Tsumune, D., Tsubono, T., Aoyama, M., and Hirose, K., 2011. Distribution of oceanic 137Cs from the Fukushima Dai-ichi Nuclear Power Plant simulated numerically by a regional ocean model. Journal of Environmental Radioactivity, DOI: 10.1016/j.jenvrad.2011.10.007.Google Scholar