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Zonal and vertical transports of Fukushima-derived radiocesium in the subarctic gyre of the North Pacific until 2014
http://hdl.handle.net/2241/0002003618
http://hdl.handle.net/2241/00020036188921ac3e-5aba-441c-a6c2-b3bedb17a0b0
名前 / ファイル | ライセンス | アクション |
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JER_247-106864.pdf (9.4 MB)
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Item type | Journal Article(1) | |||||||||||||||||||
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公開日 | 2022-05-17 | |||||||||||||||||||
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タイトル | Zonal and vertical transports of Fukushima-derived radiocesium in the subarctic gyre of the North Pacific until 2014 | |||||||||||||||||||
言語 | en | |||||||||||||||||||
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言語 | eng | |||||||||||||||||||
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資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||||
資源タイプ | journal article | |||||||||||||||||||
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アクセス権 | open access | |||||||||||||||||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||||||||||||
著者 |
Kumamoto Yuichiro
× Kumamoto Yuichiro
× 青山 道夫
× Hamajima Yasunori
× Naga Hisao
× Yamagata Takeyasu
× Murata Akihiko
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内容記述タイプ | Abstract | |||||||||||||||||||
内容記述 | The Fukushima Dai-ichi Nuclear Power Plant (FNPP1) accident in March 2011 resulted in serious radiocesium contamination of the North Pacific Ocean. Most of the radiocesium was dissolved in seawater and transported by surface currents and subduction of mode waters. Within several years after the accident, a high-concentration water plume of the FNPP1-derived radiocesium at the sea surface had been transported from Japan to the North American continent across the subarctic gyre of the North Pacific Ocean. We measured vertical profiles of dissolved radiocesium along the nominal 47°N zonal line across the North Pacific subarctic gyre twice, in summer 2012 and summer 2014. Using these data and published data, we quantitatively discussed the zonal and vertical transports of the water plume until 2014. The FNPP1-derived radiocesium remained in the surface layer shallower than 200 m, which is the approximate winter mixed-layer depth in the western subarctic gyre. The mean penetration depth did not change between 2012 and 2014. The highest concentration was observed at 180°W in 2012 and at 151°W in 2014, which suggests that the zonal transport speed of the water plume in the eastern subarctic gyre was about 3.8 cm s−1. By combining the data from the zonal line in 2014 and a nominal 152°W meridional line in 2015, we elucidated the three-dimensional size of the high-concentration water plume in summer 2014. The total inventory of the FNPP1-derived radiocesium in the subarctic North Pacific Ocean, decay-corrected to the accident date, was estimated to be 12.0 ± 2.4 PBq. | |||||||||||||||||||
言語 | en | |||||||||||||||||||
書誌情報 |
en : Journal of environmental radioactivity 巻 247, p. 106864, 発行日 2022-03-15 |
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収録物識別子タイプ | EISSN | |||||||||||||||||||
収録物識別子 | 0265-931X | |||||||||||||||||||
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収録物識別子タイプ | NCID | |||||||||||||||||||
収録物識別子 | AA10458871 | |||||||||||||||||||
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関連タイプ | isIdenticalTo | |||||||||||||||||||
識別子タイプ | DOI | |||||||||||||||||||
関連識別子 | https://doi.org/10.1016/j.jenvrad.2022.106864 | |||||||||||||||||||
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言語 | en | |||||||||||||||||||
権利情報 | © 2022 The Authors. Published by Elsevier Ltd. | |||||||||||||||||||
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言語 | en | |||||||||||||||||||
権利情報 | © 2022 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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出版タイプ | VoR | |||||||||||||||||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||||||||||||
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出版者 | Elsevier | |||||||||||||||||||
言語 | en |