A Numerical study of the effects of aerosol hygroscopic properties to dry deposition on a broad-leaved forest
エアロゾルの吸湿特性が及ぼす広葉樹林における乾性沈着への影響; 数値的研究
堅田 元喜; 梶野 瑞王*; 松田 和秀*; 高橋 章*; 中屋 耕*
Katata, Genki; Kajino, Mizuo*; Matsuda, Kazuhide*; Takahashi, Akira*; Nakaya, Ko*
To investigate the impact of hygroscopic growth on dry deposition onto forest canopies, numerical simulations of PM2.5 sulfate deposition using a multi-layer atmosphere-SOiL-VEGetation model (SOLVEG) ware performed. The scheme of particle dry deposition in SOLVEG was extended for application to a broad-leaved forest. An aerosol hygroscopic model based on the widely used $$kappa$$-K$"o$hler theory was incorporated into the model to calculate water uptake by the aerosols. The model accurately reproduced essential turbulent exchange fluxes (momentum, heat, and water vapor) over the canopies and the soil temperature and moisture for a deciduous broad-leaved forest in central Japan. Temporal variations in the measured PM2.5 sulfate deposition velocity were generally reproduced by the model. By considering an increase in particle diameter due to hygroscopic growth, the prediction accuracy of the modeled deposition velocity under humid conditions was improved. Numerical experiments for varying aerosol size distributions and hygroscopic properties showed that the geometric mean diameter and hygroscopicity of particles have a large influence on hygroscopic growth levels. The results also suggested that the deposition velocity of wet particles increased due to hygroscopic growth when the relative humidity (RH) was approximately 50%, and that the velocity reached five times greater than that under dry conditions when RH exceeded 95%.
使用言語 : English
掲載資料名 : Atmospheric Environment
: 97
ページ数 : p.501 - 510
発行年月 : 2014/11
出版社名 : Elsevier
特許データ :
論文URL :
キーワード : no keyword
使用施設 :
広報プレスリリース :
受委託・共同研究相手機関 :
登録番号 : AA20130398
抄録集掲載番号 : 42001263
論文投稿番号 : 14902
Accesses  (From Jun. 2, 2014)
- Accesses
Add This