Convection of surface water in the northeastern Japan Sea: Implications from vertical profiles of 134Cs concentrations

Mutsuo Inoue, Ryosei Takehara, Shiori Yamashita, Tomoharu Senjyu, Takami Morita, Shizuho Miki, Seiya Nagao

研究成果: ジャーナルへの寄稿記事

抄録

This study examined the spatial profiles of 134Cs concentrations in the Japan Sea (particularly in the northeastern area) in July 2017 and July 2018. We detected 134Cs in water samples above a depth of ~200 m (~0.3–1 mBq/L decay-corrected to the date of the Fukushima Dai-ichi Nuclear Power Plant accident), which predominantly reflected the mixing of 134Cs-contaminated Tsushima Warm Current (TWC) water within 4 years after 134Cs re-entry from the Pacific Ocean into the Japan Sea in 2013. Furthermore, 134Cs was only detected at depths of 300 m and 500 m (~0.2 mBq/L) in the northern Japan Basin, which corresponded to ~30% of the annual mean concentration levels in TWC water (0.75 mBq/L). Observed spatial variations in 134Cs concentrations were explained by the surface TWC circulation and subsequent convection processes.

元の言語英語
記事番号103661
ジャーナルMarine Chemistry
214
DOI
出版物ステータス出版済み - 8 20 2019

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Surface waters
vertical profile
convection
surface water
Water
Reentry
nuclear power plant
water
Nuclear power plants
accident
Accidents
spatial variation
ocean
basin
sea
Convection

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Chemistry(all)
  • Environmental Chemistry
  • Water Science and Technology

これを引用

Convection of surface water in the northeastern Japan Sea : Implications from vertical profiles of 134Cs concentrations. / Inoue, Mutsuo; Takehara, Ryosei; Yamashita, Shiori; Senjyu, Tomoharu; Morita, Takami; Miki, Shizuho; Nagao, Seiya.

:: Marine Chemistry, 巻 214, 103661, 20.08.2019.

研究成果: ジャーナルへの寄稿記事

Inoue, Mutsuo ; Takehara, Ryosei ; Yamashita, Shiori ; Senjyu, Tomoharu ; Morita, Takami ; Miki, Shizuho ; Nagao, Seiya. / Convection of surface water in the northeastern Japan Sea : Implications from vertical profiles of 134Cs concentrations. :: Marine Chemistry. 2019 ; 巻 214.
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abstract = "This study examined the spatial profiles of 134Cs concentrations in the Japan Sea (particularly in the northeastern area) in July 2017 and July 2018. We detected 134Cs in water samples above a depth of ~200 m (~0.3–1 mBq/L decay-corrected to the date of the Fukushima Dai-ichi Nuclear Power Plant accident), which predominantly reflected the mixing of 134Cs-contaminated Tsushima Warm Current (TWC) water within 4 years after 134Cs re-entry from the Pacific Ocean into the Japan Sea in 2013. Furthermore, 134Cs was only detected at depths of 300 m and 500 m (~0.2 mBq/L) in the northern Japan Basin, which corresponded to ~30{\%} of the annual mean concentration levels in TWC water (0.75 mBq/L). Observed spatial variations in 134Cs concentrations were explained by the surface TWC circulation and subsequent convection processes.",
author = "Mutsuo Inoue and Ryosei Takehara and Shiori Yamashita and Tomoharu Senjyu and Takami Morita and Shizuho Miki and Seiya Nagao",
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AU - Inoue, Mutsuo

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AU - Yamashita, Shiori

AU - Senjyu, Tomoharu

AU - Morita, Takami

AU - Miki, Shizuho

AU - Nagao, Seiya

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N2 - This study examined the spatial profiles of 134Cs concentrations in the Japan Sea (particularly in the northeastern area) in July 2017 and July 2018. We detected 134Cs in water samples above a depth of ~200 m (~0.3–1 mBq/L decay-corrected to the date of the Fukushima Dai-ichi Nuclear Power Plant accident), which predominantly reflected the mixing of 134Cs-contaminated Tsushima Warm Current (TWC) water within 4 years after 134Cs re-entry from the Pacific Ocean into the Japan Sea in 2013. Furthermore, 134Cs was only detected at depths of 300 m and 500 m (~0.2 mBq/L) in the northern Japan Basin, which corresponded to ~30% of the annual mean concentration levels in TWC water (0.75 mBq/L). Observed spatial variations in 134Cs concentrations were explained by the surface TWC circulation and subsequent convection processes.

AB - This study examined the spatial profiles of 134Cs concentrations in the Japan Sea (particularly in the northeastern area) in July 2017 and July 2018. We detected 134Cs in water samples above a depth of ~200 m (~0.3–1 mBq/L decay-corrected to the date of the Fukushima Dai-ichi Nuclear Power Plant accident), which predominantly reflected the mixing of 134Cs-contaminated Tsushima Warm Current (TWC) water within 4 years after 134Cs re-entry from the Pacific Ocean into the Japan Sea in 2013. Furthermore, 134Cs was only detected at depths of 300 m and 500 m (~0.2 mBq/L) in the northern Japan Basin, which corresponded to ~30% of the annual mean concentration levels in TWC water (0.75 mBq/L). Observed spatial variations in 134Cs concentrations were explained by the surface TWC circulation and subsequent convection processes.

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