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https://hdl.handle.net/20.500.14094/90006807
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2024-04-20
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90006807 (fulltext)
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メタデータID
90006807
アクセス権
open access
出版タイプ
Version of Record
タイトル
Submesoscale Mixing on Initial Dilution of Radionuclides Released From the Fukushima Daiichi Nuclear Power Plant
著者
Kamidaira, Yuki ; Uchiyama, Yusuke ; Kawamura, Hideyuki ; Kobayashi, Takuya ; Furuno, Akiko
著者名
Kamidaira, Yuki
著者ID
A0968
研究者ID
1000080344315
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=321466d484cf497c520e17560c007669
著者名
Uchiyama, Yusuke
内山, 雄介
ウチヤマ, ユウスケ
所属機関名
工学研究科
著者名
Kawamura, Hideyuki
著者名
Kobayashi, Takuya
著者名
Furuno, Akiko
収録物名
Journal of Geophysical Research: Oceans
巻(号)
123(4)
ページ
2808-2828
出版者
American Geophysical Union
刊行日
2018-04
公開日
2020-02-27
抄録
This study developed a submesoscale eddy-resolving oceanic dispersal modeling system comprising a double-nested oceanic downscaling model and an offline oceanic radionuclide dispersion model. This was used to investigate the influences of submesoscale coherent structures (SCSs) and associated ageostrophic secondary circulations (ASCs) on the three-dimensional (3-D) dispersal of dissolved cesium-137 (137Cs) released from the Fukushima Daiichi Nuclear Power Plant (FNPP1). Extensive model-data comparison demonstrated that the innermost high-resolution model, with a lateral grid resolution of 1 km, could successfully reproduce transient mesoscale oceanic structures, the Kuroshio path and stratification, and spatiotemporal variations of 137Cs concentrations. Using an accompanying mesoscale eddy-resolving model (grid resolution: 10 km) as a guide, we showed that submesoscale dynamics are important for improved representation of both the eddy field and the resultant 3-D dispersal of 137Cs, with the temporal variability of surface 137Cs near the FNPP1 being equivalent to that in the coarse-resolution model. According to energy conversion and spectral analyses, SCSs and ASCs occur most intensively on the submesoscale, primarily because of shear instability. However, baroclinic instability serves as a secondary mechanism. SCSs have prominent seasonality, reflected by intensification in the colder months, which is when the FNPP1 accident occurred. Analysis of the vertical flux of 137Cs was performed by decomposition of the variables into eddy, mesoscale, and submesoscale components using frequency and wave number filters. It revealed that 42.7% of the FNPP1-derived 137Cs was transported downward below the mixed layer by eddies with the major contribution being from ASCs induced by submesoscale eddies.
キーワード
submesoscale coherent structures
Kuroshio
Fukushima Daiichi Nuclear Power Plant accident
oceanic dispersion simulation
137Cs
ROMS
SEA
カテゴリ
工学研究科
学術雑誌論文
権利
An edited version of this paper was published by AGU. Copyright 2018 American Geophysical Union
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資源タイプ
journal article
言語
English (英語)
ISSN
2169-9275
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eISSN
2169-9291
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NCID
AA10819754
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関連情報
DOI
https://doi.org/10.1002/2017JC013359
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