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Report No.

Lateral transport of Fukushima Daiichi Nuclear Power Plant accident-derived particulate radiocesium to semi-pelagic ocean off Fukushima

Buesseler, K. O.*; German, C. R.*; Honda, Makio*; Otosaka, Shigeyoshi  ; Black, E. E.*; Kawakami, Hajime*; Manganini, S. M.*; Pike, S.*

A three year time-series of particle fluxes is presented from sediment traps deployed at 500 and 1000 m at a site 115 km southeast of Fukushima Daiichi Nuclear Power Plant. Results show a high fraction of lithogenic material in sinking particles, suggesting a lateral source of sediments. From $$^{137}$$Cs/$$^{210}$$Pb ratio in sinking particles, it was inferred that accident-derived radiocesium associate with slope and shelf sediments were resuspended and transported laterally to the offshore regions in winter and typhoon seasons. Continuous observation of such transport processes of particulate radiocesium near the seabed would be significant for better understanding of the fate of accident-derived radiocesium.



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