Articles | Volume 12, issue 23
Biogeosciences, 12, 7107–7128, 2015
https://doi.org/10.5194/bg-12-7107-2015
Biogeosciences, 12, 7107–7128, 2015
https://doi.org/10.5194/bg-12-7107-2015

Research article 08 Dec 2015

Research article | 08 Dec 2015

Ocean dynamic processes causing spatially heterogeneous distribution of sedimentary caesium-137 massively released from the Fukushima Daiichi Nuclear Power Plant

H. Higashi et al.

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Cited articles

Ambe, D., Kaeriyama, H., Shigenobu, Y., Fujimoto, K., Ono, T., Sawada, H., Saito, H., Miki, S., Setou, T., Morita, T., and Watanabe, T.: Five-minute resolved spatial distribution of radiocesium in sea sediment derived from the Fukushima Dai-ichi Nuclear Power Plant, J. Environ. Radioactiv., 138, 264–275, https://doi.org/10.1016/j.jenvrad.2014.09.007, 2014.
Aoyagi, K. and Igarashi, S.: On the size distribution of sediments in the coastal sea of Fukushima Prefecture, Bull. Fukushima Prefecture Fish. Exp. Station, 8, 69–81, 1999 (in Japanese).
Blaas, M., Dong, C., Marchesiello, P., McWilliams, J. C., and Stolzenbach, K. D.: Sediment-transport modeling on Southern Californian shelves: a ROMS case study, Cont. Shelf Res., 27, 832–853, 2007.
Buesseler, K., Aoyama, M., and Fukasawa, M.: Impacts of the Fukushima nuclear power plants on marine radioactivity, Environ. Sci. Technol., 45, 9931–9935, https://doi.org/10.1021/es202816c, 2011.
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Short summary
We elucidated ocean dynamic processes causing spatially-heterogeneous sedimentary radiocaesium-137 distribution in and around the shelf off Fukushima and adjacent prefectures on the basis of numerical simulation. Our result suggests that accumulation of sedimentary radiocaesium-137 in a swath just offshore of shelf break results from spatiotemporal variation of bottom friction occurred via a periodic spring tide about every 2 weeks and via occasional strong wind.
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