道東沖合表層における134Cs濃度の経年変動からみた海水循環

新垣 亮真; 真下 海成; 井上 睦夫; 谷内 由貴子; 中野渡 拓也; 長尾 誠也

doi:10.14862/geochemproc.71.0_66

Abstracts of Annual Meeting of the Geochemical Society of Japan

DOI https://doi.org/10.14862/geochemproc.71.0_66

Conference information

Host: Abstracts of Annual Meeting of the Geochemical Society of Japan

Name : Abstracts of Annual Meeting of the Geochemical Society of Japan

Number : 71

Date : September 18, 2024 - September 20, 2024

Temporal variations of 134Cs concentration off the Doto; Implications for water circulations.

*Arakaki Ryoma, Mashita Kaisei, Inoue Mutsuo, Taniuti Yukiko, Nakanowatari Takuya, Nagao Seiya

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Keywords: 134-Cs, seawater circulation, Okhotsk Sea

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Pages 66-

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Abstract

134-Cs is an artificial radionuclide released into the marine environment by the 2011Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, and is subsequentlytransported along with currents. From the short half-life (2.06 years) and solublecharacteristics, 134-Cs currently detected in seawater is derived from the FDNPP accident. Therefore, 134-Cs is a strong chemical tracer to study the seawater circulations. In this study, we examined the temporal variation of 134-Cs concentrations in the sea surface off the Doto and the southwestern Okhotsk Sea from 2018 to 2024 and discuss the subarctic current systems in the northwestern North Pacific Ocean, including water circulation timespans.

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