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

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Title: Factors controlling dissolved 137Cs activities in Matsukawa-ura lagoon, a semi-closed estuary, after the Fukushima accident.
Authors: Niida, Takuya1,2 (AUTHOR) niida_takuya@kanso.co.jp, Takata, Hyoe3 (AUTHOR), Watanabe, Sho4 (AUTHOR), Namura, Shinya1 (AUTHOR), Wada, Toshihiro3 (AUTHOR)
Source: Biogeosciences. 2026, Vol. 23 Issue 10, p3591-3604. 14p.
Subject Terms: *Temperature effect, *Sediment-water interfaces, *Estuary management, *Lagoons, *Radioactive contamination, *Fukushima Nuclear Accident, Fukushima, Japan, 2011, *Seasonal temperature variations
Geographic Terms: Fukushima-ken (Japan), Japan
Company/Entity: Fukushima Daiichi Nuclear Power Plant (Japan)
Abstract: The spatial and seasonal dynamics of 137Cs were investigated from 2021 to 2023 in Matsukawa-ura lagoon, a semi-closed estuarine area approximately 40 km north of the Fukushima Daiichi Nuclear Power Plant (FDNPP), Japan. The weighted mean dissolved 137Cs concentrations in the lagoon ranged from 5.3 to 19 Bqm-3 , which were 2.4–8.6 times higher than those in the surrounding coastal seawater and inflowing river waters. Furthermore, dissolved 137Cs concentrations in the lagoon were higher in summer than in winter and showed a strong positive correlation with water temperature. Simplified box-model estimation indicates that continuous terrestrial input 137Cs are unlikely to contribute to the spatiotemporal variability of dissolved 137Cs concentrations in the lagoon. Instead 137Cs deposited in bottom sediments during the early stages of the FDNPP accident is gradually released as pore waters are exposed to seawater entering the lagoon, thereby sustaining elevated dissolved 137Cs concentrations. These results indicate that warmer summer conditions enhance the dissolution of 137Cs from bottom sediments and highlight the importance of sediment–pore water processes in controlling 137Cs dynamics in the coastal environments of Fukushima Prefecture. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 194401804
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Factors controlling dissolved <superscript>137</superscript>Cs activities in Matsukawa-ura lagoon, a semi-closed estuary, after the Fukushima accident.
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  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Niida%2C+Takuya%22">Niida, Takuya</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> niida_takuya@kanso.co.jp</i><br /><searchLink fieldCode="AR" term="%22Takata%2C+Hyoe%22">Takata, Hyoe</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Watanabe%2C+Sho%22">Watanabe, Sho</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Namura%2C+Shinya%22">Namura, Shinya</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wada%2C+Toshihiro%22">Wada, Toshihiro</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Biogeosciences%22">Biogeosciences</searchLink>. 2026, Vol. 23 Issue 10, p3591-3604. 14p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink><br />*<searchLink fieldCode="DE" term="%22Sediment-water+interfaces%22">Sediment-water interfaces</searchLink><br />*<searchLink fieldCode="DE" term="%22Estuary+management%22">Estuary management</searchLink><br />*<searchLink fieldCode="DE" term="%22Lagoons%22">Lagoons</searchLink><br />*<searchLink fieldCode="DE" term="%22Radioactive+contamination%22">Radioactive contamination</searchLink><br />*<searchLink fieldCode="DE" term="%22Fukushima+Nuclear+Accident%2C+Fukushima%2C+Japan%2C+2011%22">Fukushima Nuclear Accident, Fukushima, Japan, 2011</searchLink><br />*<searchLink fieldCode="DE" term="%22Seasonal+temperature+variations%22">Seasonal temperature variations</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Fukushima-ken+%28Japan%29%22">Fukushima-ken (Japan)</searchLink><br /><searchLink fieldCode="DE" term="%22Japan%22">Japan</searchLink>
– Name: SubjectCompany
  Label: Company/Entity
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Fukushima+Daiichi+Nuclear+Power+Plant+%28Japan%29%22">Fukushima Daiichi Nuclear Power Plant (Japan)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The spatial and seasonal dynamics of 137Cs were investigated from 2021 to 2023 in Matsukawa-ura lagoon, a semi-closed estuarine area approximately 40 km north of the Fukushima Daiichi Nuclear Power Plant (FDNPP), Japan. The weighted mean dissolved 137Cs concentrations in the lagoon ranged from 5.3 to 19 Bqm-3 , which were 2.4–8.6 times higher than those in the surrounding coastal seawater and inflowing river waters. Furthermore, dissolved 137Cs concentrations in the lagoon were higher in summer than in winter and showed a strong positive correlation with water temperature. Simplified box-model estimation indicates that continuous terrestrial input 137Cs are unlikely to contribute to the spatiotemporal variability of dissolved 137Cs concentrations in the lagoon. Instead 137Cs deposited in bottom sediments during the early stages of the FDNPP accident is gradually released as pore waters are exposed to seawater entering the lagoon, thereby sustaining elevated dissolved 137Cs concentrations. These results indicate that warmer summer conditions enhance the dissolution of 137Cs from bottom sediments and highlight the importance of sediment–pore water processes in controlling 137Cs dynamics in the coastal environments of Fukushima Prefecture. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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        Value: 10.5194/bg-23-3591-2026
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 3591
    Subjects:
      – SubjectFull: Temperature effect
        Type: general
      – SubjectFull: Sediment-water interfaces
        Type: general
      – SubjectFull: Estuary management
        Type: general
      – SubjectFull: Lagoons
        Type: general
      – SubjectFull: Radioactive contamination
        Type: general
      – SubjectFull: Fukushima Nuclear Accident, Fukushima, Japan, 2011
        Type: general
      – SubjectFull: Seasonal temperature variations
        Type: general
      – SubjectFull: Fukushima-ken (Japan)
        Type: general
      – SubjectFull: Japan
        Type: general
      – SubjectFull: Fukushima Daiichi Nuclear Power Plant (Japan)
        Type: general
    Titles:
      – TitleFull: Factors controlling dissolved 137Cs activities in Matsukawa-ura lagoon, a semi-closed estuary, after the Fukushima accident.
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            NameFull: Niida, Takuya
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            NameFull: Takata, Hyoe
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            NameFull: Watanabe, Sho
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            NameFull: Namura, Shinya
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            – D: 15
              M: 05
              Text: 2026
              Type: published
              Y: 2026
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              Value: 23
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              Value: 10
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            – TitleFull: Biogeosciences
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