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  1. 生命環境系 (Faculty of Life and Environmental Sciences)
  2. 恩田 裕一 (Onda Yuichi)
  1. 生命環境系 (Faculty of Life and Environmental Sciences)
  2. 青山 道夫 (Aoyama Michio)
  1. コンテンツタイプ (Contents Type)
  2. 雑誌発表論文等 (Journal article, etc.)
  3. J~
  4. Journal of environmental radioactivity

Impacts of direct release and river discharge on oceanic 137Cs derived from the Fukushima Dai-ichi Nuclear Power Plant accident

http://hdl.handle.net/2241/00159500
4804cd87-6084-4e0b-bd04-f0fd519cf507
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JER_2014-2015.pdf JER_2014-2015-106173 (3.1 MB)
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item type Journal Article(1)
公開日 2020-01-28
タイトル
言語 en
タイトル Impacts of direct release and river discharge on oceanic 137Cs derived from the Fukushima Dai-ichi Nuclear Power Plant accident
言語
言語 eng
資源タイプ
タイプ journal article
著者 恩田, 裕一

× 恩田, 裕一

WEKO 731
e-Rad 00221862
筑波大学研究者総覧 0000001209

恩田, 裕一

ja-Kana オンダ, ユウイチ

en ONDA, Yuichi

Search repository
青山, 道夫

× 青山, 道夫

WEKO 211008

青山, 道夫

ja-Kana アオヤマ, ミチオ

en AOYAMA, Michio

Search repository
Tsumune, Daisuke

× Tsumune, Daisuke

WEKO 217468

en Tsumune, Daisuke

Search repository
Tsubono, Takaki

× Tsubono, Takaki

WEKO 217469

en Tsubono, Takaki

Search repository
Misumi, Kazuhiro

× Misumi, Kazuhiro

WEKO 217470

en Misumi, Kazuhiro

Search repository
Tateda, Yutaka

× Tateda, Yutaka

WEKO 217471

en Tateda, Yutaka

Search repository
Toyoda, Yasushi

× Toyoda, Yasushi

WEKO 217472

en Toyoda, Yasushi

Search repository
抄録
内容記述 A series of accidents at the Fukushima Dai-ichi Nuclear Power Plant (1F NPP) following the Great East Japan Earthquake and tsunami of 11 March 2011 resulted in the release of radioactive materials to the ocean. We used the Regional Ocean Model System (ROMS) to simulate the 137Cs activity in the oceanic area off Fukushima, with the sources of radioactivity being direct release, atmospheric deposition, river discharge, and inflow across the domain boundary. The direct release rate of 137Cs after the accident until the end of 2016 was estimated by comparing simulated results with measured 137Cs activities adjacent to the 1F NPP. River discharge rates of 137Cs were estimated by multiplying simulated river flow rates by the dissolved 137Cs activities, which were estimated by an empirical function. Inflow of 137Cs across the domain boundary was set according to the results of a North Pacific Ocean model. Because the spatiotemporal variability of 137Cs activity was large, the simulated results were compared with the annual averaged observed 137Cs activity distribution. Normalized annual averaged 137Cs activity distributions in the regional ocean were similar for each year from 2013 to 2016. This result suggests that the annual averaged distribution is predictable. Simulated 137Cs activity attributable to direct release was in good agreement with measurement data from the coastal zone adjacent to the 1F NPP. Comparison of the simulated results with measured activity in the offshore area indicated that the simulation slightly underestimated the activity attributable to inflow across the domain boundary. This result suggests that recirculation of subducted 137Cs to the surface layer was underestimated by the North Pacific model. During the study period, the effect of river discharge on oceanic 137Cs activity was small compared to the effect of directly released 137Cs.
書誌情報 en : Journal of environmental radioactivity

巻 214-215, p. 106173, 発行日 2020-04
ISSN
収録物識別子 0265931X
書誌レコードID
収録物識別子 AA10458871
DOI
関連識別子
関連識別子 10.1016/j.jenvrad.2020.106173
権利
権利情報 © 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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値 publisher
出版者
出版者 Elsevier
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