Articles | Volume 14, issue 4
https://doi.org/10.5194/os-14-813-2018
https://doi.org/10.5194/os-14-813-2018
Research article
 | 
24 Aug 2018
Research article |  | 24 Aug 2018

Transport of FNPP1-derived radiocaesium from subtropical mode water in the western North Pacific Ocean to the Sea of Japan

Yayoi Inomata, Michio Aoyama, Yasunori Hamajima, and Masatoshi Yamada

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Short summary
Analysing increased 137Cs and 134Cs / 137Cs ratio derived from the Fukushima Nuclear Power Plant accident in the Sea of Japan and its marginal sea, we found a rapid transport process associated with subduction in the subtropical mode water (STMW) formation region and obduction in the north East China Sea. The integrated amount of FNPP1 137Cs entering the Sea of Japan until 2016 was estimated to be 0.21 ± 0.03 PBq, which corresponds to 5.1 (3.4–8.0) % of the total amount of FNPP1 137Cs in the STMW.