Articles | Volume 23, issue 10
https://doi.org/10.5194/bg-23-3591-2026
https://doi.org/10.5194/bg-23-3591-2026
Research article
 | 
26 May 2026
Research article |  | 26 May 2026

Factors controlling dissolved 137Cs activities in Matsukawa-ura lagoon, a semi-closed estuary, after the Fukushima accident

Takuya Niida, Hyoe Takata, Sho Watanabe, Shinya Namura, and Toshihiro Wada

Cited articles

Aoyama, M., Uematsu, M., Tsumune, D., and Hamajima, Y.: Surface pathway of radioactive plume of TEPCO Fukushima NPP1 released 134Cs and 137Cs, Biogeosciences, 10, 3067–3078, https://doi.org/10.5194/bg-10-3067-2013, 2013. 
Aoyama, M., Kajino, M., Tanaka, T. Y., Sekiyama, T. T., Tsumune, D., Tsubono, T., Hamajima, Y., Inomata, Y., and Gamo, T.: 134Cs and 137Cs in the North Pacific Ocean derived from the TEPCO Fukushima Dai-ichi Nuclear Power Plant accident, Japan in March 2011. Part Two: estimation of 134Cs and 137Csinventories in the North Pacific Ocean, J. Oceanogr., 72, 67–76, https://doi.org/10.1007/s10872-015-0332-2, 2016. 
Arita, K., Yabe, T., and Hayashi, S.: Actual situation of concentration and inventory of radioactive cesium in Matsukawa-ura Lagoon sediment, Fukushima Prefecture, J. Jpn. Soc. Civ. Eng. Ser. G (Environ. Res.), 70, III_225–III_231, https://doi.org/10.2208/jscejer.70.III_225, 2014 (in Japanese with English abstract). 
Fukushima Prefecture Webpage: https://www.pref.fukushima.lg.jp/uploaded/attachment/738356.pdf, last access: 30 June 2024. 
IAEA: Sediment Distribution Coefficients and Concentration Factors for Biota in the Marine Environment, Technical Reports Series No. 422, International Atomic Energy Agency, Vienna, Austria, https://www-pub.iaea.org/MTCD/Publications/PDF/TRS422_web.pdf (last access: 30 June 2024), 2004. 
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Short summary
This study on 137Cs was conducted in Matsukawa-ura lagoon, a semi-enclosed estuary 40 km north of Fukushima Dai-ichi Nuclear Power Plant. Few studies exist on 137Cs in estuaries, so this research aimed to estimate its source using mass balance calculations. Results indicated that dissolved 137Cs in the lagoon is influenced by water temperature, with bottom sediments contributing more significantly to 137Cs levels than river sources.
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