The seasonal variations of atmospheric 134,137Cs activity and possible host particles for their resuspension in the contaminated areas of Tsushima and Yamakiya, Fukushima, Japan

Takeshi Kinase, Kazuyuki Kita, Yasuhito Igarashi, Kouji Adachi, Kazuhiko Ninomiya, Atsushi Shinohara, Hiroshi Okochi, Hiroko Ogata, Masahide Ishizuka, Sakae Toyoda, Keita Yamada, Naohiro Yoshida, Yuji Zaizen, Masao Mikami, Hiroyuki Demizu, Yuichi Onda

    研究成果: Article

    4 引用 (Scopus)

    抄録

    A large quantity of radionuclides was released by the Fukushima Daiichi Nuclear Power Plant accident in March 2011, and those deposited on ground and vegetation could return to the atmosphere through resuspension processes. Although the resuspension has been proposed to occur with wind blow, biomass burning, ecosystem activities, etc., the dominant process in contaminated areas of Fukushima is not fully understood. We have examined the resuspension process of radiocesium (134,137Cs) based on long-term measurements of the atmospheric concentration of radiocesium activity (the radiocesium concentration) at four sites in the contaminated areas of Fukushima as well as the aerosol characteristic observations by scanning electron microscopy (SEM) and the measurement of the biomass burning tracer, levoglucosan. The radiocesium concentrations at all sites showed a similar seasonal variation: low from winter to early spring and high from late spring to early autumn. In late spring, they showed positive peaks that coincided with the wind speed peaks. However, in summer and autumn, they were correlated positively with atmospheric temperature but negatively with wind speed. These results differed from previous studies based on data at urban sites. The difference of radiocesium concentrations at two sites, which are located within a 1 km range but have different degrees of surface contamination, was large from winter to late spring and small in summer and autumn, indicating that resuspension occurs locally and/or that atmospheric radiocesium was not well mixed in winter/spring, and it was opposite in summer/autumn. These results suggest that the resuspension processes and the host particles of the radiocesium resuspension changed seasonally. The SEM analyses showed that the dominant coarse particles in summer and autumn were organic ones, such as pollen, spores, and microorganisms. Biological activities in forest ecosystems can contribute considerably to the radiocesium resuspension in these seasons. During winter and spring, soil, mineral, and vegetation debris were predominant coarse particles in the atmosphere, and the radiocesium resuspension in these seasons can be attributed to the wind blow of these particles. Any proofs that biomass burning had a significant impact on atmospheric radiocesium were not found in the present study. [Figure not available: see fulltext.].

    元の言語English
    記事番号12
    ジャーナルProgress in Earth and Planetary Science
    5
    発行部数1
    DOI
    出版物ステータスPublished - 2018 12 1

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    resuspension
    seasonal variation
    autumn
    biomass burning
    winter
    summer
    wind velocity
    scanning electron microscopy
    particle
    contaminated area
    atmosphere
    vegetation
    urban site
    nuclear power plant
    forest ecosystem
    accident
    radionuclide
    spore
    pollen
    air temperature

    ASJC Scopus subject areas

    • Earth and Planetary Sciences(all)

    これを引用

    The seasonal variations of atmospheric 134,137Cs activity and possible host particles for their resuspension in the contaminated areas of Tsushima and Yamakiya, Fukushima, Japan. / Kinase, Takeshi; Kita, Kazuyuki; Igarashi, Yasuhito; Adachi, Kouji; Ninomiya, Kazuhiko; Shinohara, Atsushi; Okochi, Hiroshi; Ogata, Hiroko; Ishizuka, Masahide; Toyoda, Sakae; Yamada, Keita; Yoshida, Naohiro; Zaizen, Yuji; Mikami, Masao; Demizu, Hiroyuki; Onda, Yuichi.

    :: Progress in Earth and Planetary Science, 巻 5, 番号 1, 12, 01.12.2018.

    研究成果: Article

    Kinase, T, Kita, K, Igarashi, Y, Adachi, K, Ninomiya, K, Shinohara, A, Okochi, H, Ogata, H, Ishizuka, M, Toyoda, S, Yamada, K, Yoshida, N, Zaizen, Y, Mikami, M, Demizu, H & Onda, Y 2018, 'The seasonal variations of atmospheric 134,137Cs activity and possible host particles for their resuspension in the contaminated areas of Tsushima and Yamakiya, Fukushima, Japan', Progress in Earth and Planetary Science, 巻. 5, 番号 1, 12. https://doi.org/10.1186/s40645-018-0171-z
    Kinase, Takeshi ; Kita, Kazuyuki ; Igarashi, Yasuhito ; Adachi, Kouji ; Ninomiya, Kazuhiko ; Shinohara, Atsushi ; Okochi, Hiroshi ; Ogata, Hiroko ; Ishizuka, Masahide ; Toyoda, Sakae ; Yamada, Keita ; Yoshida, Naohiro ; Zaizen, Yuji ; Mikami, Masao ; Demizu, Hiroyuki ; Onda, Yuichi. / The seasonal variations of atmospheric 134,137Cs activity and possible host particles for their resuspension in the contaminated areas of Tsushima and Yamakiya, Fukushima, Japan. :: Progress in Earth and Planetary Science. 2018 ; 巻 5, 番号 1.
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    AU - Kinase, Takeshi

    AU - Kita, Kazuyuki

    AU - Igarashi, Yasuhito

    AU - Adachi, Kouji

    AU - Ninomiya, Kazuhiko

    AU - Shinohara, Atsushi

    AU - Okochi, Hiroshi

    AU - Ogata, Hiroko

    AU - Ishizuka, Masahide

    AU - Toyoda, Sakae

    AU - Yamada, Keita

    AU - Yoshida, Naohiro

    AU - Zaizen, Yuji

    AU - Mikami, Masao

    AU - Demizu, Hiroyuki

    AU - Onda, Yuichi

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    N2 - A large quantity of radionuclides was released by the Fukushima Daiichi Nuclear Power Plant accident in March 2011, and those deposited on ground and vegetation could return to the atmosphere through resuspension processes. Although the resuspension has been proposed to occur with wind blow, biomass burning, ecosystem activities, etc., the dominant process in contaminated areas of Fukushima is not fully understood. We have examined the resuspension process of radiocesium (134,137Cs) based on long-term measurements of the atmospheric concentration of radiocesium activity (the radiocesium concentration) at four sites in the contaminated areas of Fukushima as well as the aerosol characteristic observations by scanning electron microscopy (SEM) and the measurement of the biomass burning tracer, levoglucosan. The radiocesium concentrations at all sites showed a similar seasonal variation: low from winter to early spring and high from late spring to early autumn. In late spring, they showed positive peaks that coincided with the wind speed peaks. However, in summer and autumn, they were correlated positively with atmospheric temperature but negatively with wind speed. These results differed from previous studies based on data at urban sites. The difference of radiocesium concentrations at two sites, which are located within a 1 km range but have different degrees of surface contamination, was large from winter to late spring and small in summer and autumn, indicating that resuspension occurs locally and/or that atmospheric radiocesium was not well mixed in winter/spring, and it was opposite in summer/autumn. These results suggest that the resuspension processes and the host particles of the radiocesium resuspension changed seasonally. The SEM analyses showed that the dominant coarse particles in summer and autumn were organic ones, such as pollen, spores, and microorganisms. Biological activities in forest ecosystems can contribute considerably to the radiocesium resuspension in these seasons. During winter and spring, soil, mineral, and vegetation debris were predominant coarse particles in the atmosphere, and the radiocesium resuspension in these seasons can be attributed to the wind blow of these particles. Any proofs that biomass burning had a significant impact on atmospheric radiocesium were not found in the present study. [Figure not available: see fulltext.].

    AB - A large quantity of radionuclides was released by the Fukushima Daiichi Nuclear Power Plant accident in March 2011, and those deposited on ground and vegetation could return to the atmosphere through resuspension processes. Although the resuspension has been proposed to occur with wind blow, biomass burning, ecosystem activities, etc., the dominant process in contaminated areas of Fukushima is not fully understood. We have examined the resuspension process of radiocesium (134,137Cs) based on long-term measurements of the atmospheric concentration of radiocesium activity (the radiocesium concentration) at four sites in the contaminated areas of Fukushima as well as the aerosol characteristic observations by scanning electron microscopy (SEM) and the measurement of the biomass burning tracer, levoglucosan. The radiocesium concentrations at all sites showed a similar seasonal variation: low from winter to early spring and high from late spring to early autumn. In late spring, they showed positive peaks that coincided with the wind speed peaks. However, in summer and autumn, they were correlated positively with atmospheric temperature but negatively with wind speed. These results differed from previous studies based on data at urban sites. The difference of radiocesium concentrations at two sites, which are located within a 1 km range but have different degrees of surface contamination, was large from winter to late spring and small in summer and autumn, indicating that resuspension occurs locally and/or that atmospheric radiocesium was not well mixed in winter/spring, and it was opposite in summer/autumn. These results suggest that the resuspension processes and the host particles of the radiocesium resuspension changed seasonally. The SEM analyses showed that the dominant coarse particles in summer and autumn were organic ones, such as pollen, spores, and microorganisms. Biological activities in forest ecosystems can contribute considerably to the radiocesium resuspension in these seasons. During winter and spring, soil, mineral, and vegetation debris were predominant coarse particles in the atmosphere, and the radiocesium resuspension in these seasons can be attributed to the wind blow of these particles. Any proofs that biomass burning had a significant impact on atmospheric radiocesium were not found in the present study. [Figure not available: see fulltext.].

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    KW - Radiocesium

    KW - Resuspension

    KW - Seasonal variation

    KW - Spore

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