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Assessment of the aerosol water content in urban atmospheric particles by the hygroscopic growth measurements in Sapporo, Japan

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タイトル: Assessment of the aerosol water content in urban atmospheric particles by the hygroscopic growth measurements in Sapporo, Japan
著者: Kitamori, Yasuyuki 著作を一覧する
Mochida, Michihiro 著作を一覧する
Kawamura, Kimitaka 著作を一覧する
キーワード: Atmospheric particles
Particle hygroscopicity
Aerosol water content
発行日: 2009年 7月
出版者: Elsevier Ltd.
誌名: Atmospheric Environment
巻: 43
号: 21
開始ページ: 3416
終了ページ: 3423
出版社 DOI: 10.1016/j.atmosenv.2009.03.037
抄録: Aerosol water content (AWC) of urban aerosol particles was investigated based on the hygroscopic growth measurements for 100 and 200 nm particles using a hygroscopicity tandem differential mobility analyzer in Sapporo, Japan in July 2006. In most of the humidogram measurements, presence of less and more hygroscopic modes was evident from the different dependence on relative humidity (RH). The volume of liquid water normalized by that of dry particle (V_[W](RH)/V_[dry]) was estimated from the HTDMA data for 100 and 200 nm particles. The RH dependence of V_[W](RH)/V_[dry] was well represented by a fitted curve with a hygroscopicity parameter K_[eff]. The K_[eff] values for 200 nm particles were in general higher than those for 100 nm particles, indicating a higher hygroscopicity of 200 nm particles. Based on the K_[eff] values, the volume mixing ratios of water-soluble inorganic compounds (ammonium sulfate equivalent) were estimated to be on average 31% and 45% for 100 and 200 nm particles, respectively. The diurnal variation Of K_[eff], with relatively higher values in the noontime and nighttime and lower values in the morning and evening hours, was observed for both particle sizes. The V_[W](RH)/V_[dry] values under ambient RH conditions were estimated from K_[eff] to range from 0.05 to 2.32 and 0.06 to 2.43 for 100 nm and 200 nm particles, respectively. The degree of correlation between K_[eff] and V_[W](RH)/V_[dry] at ambient RH suggests a significant contribution of the variation Of K_[eff] to atmospheric AWC in Sapporo.
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 北森 康之


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