Understanding of aerosol wet deposition mechanisms using physical and chemical observations of precipitation and a meteorological chemistry model

• Project/Area Number: 15K16121
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: Japan, Meteorological Research Institute
• Principal Investigator: Kajino Mizuo 気象庁気象研究所, 環境・応用気象研究部, 主任研究官 (00447939)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: エアロゾル / 化学輸送モデル / 湿性除去 / Rainout/washout比 / エアロゾル・雲相互作用 / ラージエディシミュレーション

Outline of Final Research Achievements

Wet deposition process determines the deposition amounts of atmospheric aerosols and the abundance in the air. Wet deposition consists of the two distinct processes: in-cloud scavenging acting as cloud condensation nuclei (rainout) and coalescence by settling hydrometeors (washout), but the two processes has not been separately evaluated by conventional observations. In this study, continuous observations of physical and chemical properties of precipitation and aerosols have been done at Meteorological Research Institute (Tsukuba city) and the rainout/washout contributions were quantitatively evaluated. The washout contribution of sulfur oxides was estimated as 20%, which are significantly lower than the previous studies (approximately 50%, both for observations and simulations).

Research Products

• [Journal Article] Long-term assessment of airborne radiocesium after the Fukushima nuclear accident: re-suspension from bare soil and forest ecosystems (2016)
  • Author(s): Kajino, M., Ishizuka, M., Igarashi, Y., Kita, K., Yoshikawa, C. and Inatsu, M.
  • Journal Title: Atmos. Chem. Phys Volume: 16 Issue: 20 Pages: 13149-13172
  • DOI: 10.5194/acp-16-13149-2016
  • Peer Reviewed / Open Access
• [Journal Article] A model validation study of the washout/rainout contribution of sulfate and nitrate in wet deposition compared with precipitation chemistry data in Japan (2015)
  • Author(s): Kajino, M., Aikawa, M.
  • Journal Title: Atmospheric Environment Volume: 117 Pages: 124-134
  • DOI: 10.1016/j.atmosenv.2015.06.042
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] SCALE-LESにおけるエアロゾルモジュールの実装 (2016)
  • Author(s): 梶野瑞王、佐藤陽祐、島伸一郎
  • Organizer: エアロゾルー雲相互作用について語らう会
  • Place of Presentation: 国立極地研究所（東京都立川市）
  • Year and Date: 2016-02-26
• [Presentation] エアロゾル湿性除去過程に関する物理・化学同時観測 (2016)
  • Author(s): 梶野瑞王、藍川昌秀、平木隆年、堀江洋祐、財前祐二、足立光司、田尻拓也、川端康弘、五十嵐康人
  • Organizer: 2016年日本気象学会春季大会
  • Place of Presentation: 国立オリンピック記念青少年総合センター（東京都渋谷区）
• [Presentation] 雲微物理過程のエアロゾル均一核形成の不確定性に対する感度 (2016)
  • Author(s): 梶野瑞王、佐藤陽祐
  • Organizer: 2016年日本気象学会春季大会
  • Place of Presentation: 国立オリンピック記念青少年総合センター（東京都渋谷区）
• [Presentation] Toward consistent prediction of physical, chemical and optical properties of aerosols, gases and precipitation in Northeast Asia (2015)
  • Author(s): Kajino, M. et al.
  • Organizer: 13th International Conference on Atmospheric Sciences and Applications to Air Quality
  • Place of Presentation: 神戸国際会議場（兵庫県神戸市）
  • Year and Date: 2015-11-11
  • Int'l Joint Research
• [Presentation] Toward a minimal representation of aerosols in gas-aerosol-cloud interaction modeling (2015)
  • Author(s): Kajino, M., Sato, Y.
  • Organizer: International Workshop on downscaling 2015
  • Place of Presentation: つくば国際会議場（茨城県つくば市）
  • Year and Date: 2015-10-06
• [Remarks] 気象庁気象研究所 環境・応用気象研究部 第四研究室 主任研究官 梶野瑞王
  • URL: http://www.mri-jma.go.jp/Member/ap/uokajinomizuoka.html
• [Remarks] メンバー紹介 環境・応用気象研究部
  • URL: http://www.mri-jma.go.jp/Dep/ap/ap4lab/member/member_kajino.html
• [Remarks] 気象庁気象研究所 環境・応用気象研究部 第四研究室 主任研究官 梶野瑞王
  • URL: http://www.mri-jma.go.jp/Member/ap/uokajinomizuoka.html