Numerical Analyses of Transport Processes of Bioaerosol Released from a Temperate Deciduous Broad-Leaved Forest

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  • MINAMI Kotaro
    Graduate School of Science and Engineering, Ibaraki University
  • KATATA Genki
    Global and Local Environment Co-creation Institute, Ibaraki University The Canon Institute for Global Studies
  • KITA Kazuyuki
    Graduate School of Science and Engineering, Ibaraki University
  • SORIMACHI Atsuyuki
    Integrated Center for Science and Humanities, Fukushima Medical University
  • HOSAKA Kentaro
    Department of Botany, National Museum of Nature and Science
  • IGARASHI Yasuhito
    Graduate School of Science and Engineering, Ibaraki University Institute for Integrated Radiation and Nuclear Science, Kyoto University

Bibliographic Information

Other Title
  • 温帯落葉広葉樹林から放出されたバイオエアロゾルの輸送過程の数値解析
  • オンタイ オチバ コウヨウジュリン カラ ホウシュツ サレタ バイオエアロゾル ノ ユソウ カテイ ノ スウチ カイセキ

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Abstract

<p>　Following the Fukushima Daiichi nuclear power plant accident, it has been recognized that bioaerosols with radioactive cesium may have released from radiologically contaminated forest into the atmosphere. In order to evaluate the above process, the emission rate of bioaerosol was inversely estimated using a numerical model named SOLVEG that includes the processes of emission, deposition, and turbulent transport of aerosols. For the inverse estimation, micrometeorological variables and bioaerosol number concentration and flux were observed at a Japanese temperate broad-leaved forest in summer. By tuning modelled emission rate of bioaerosols from forest floor, its best estimate was obtained at the agreement between calculated and observed concentrations below the canopy. General trends of calculated momentum, heat, and bioaerosol fluxes above the canopy were also reproduced in the simulation. In the numerical experiment without bioaerosol input at the top of atmosphere above the canopy, a certain amount (59%) of bioaerosol flux at the floor released above the canopy top, while the rest of the flux deposited onto both canopy and soil. This potential flux above the canopy top was 2.0±1.8×10-2 μg m-2 s-1, which may correspond to the re-emission rate proposed previously by the chemical transport model.</p>

Journal

  • Earozoru Kenkyu

    Earozoru Kenkyu 35 (3), 208-218, 2020-09-20

    Japan Association of Aerosol Science and Technology

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