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Relationship between hygroscopicity and cloud condensation nuclei activity for urban aerosols in Tokyo

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Title: Relationship between hygroscopicity and cloud condensation nuclei activity for urban aerosols in Tokyo
Authors: Mochida, Michihiro Browse this author
Kuwata, Mikinori Browse this author
Miyakawa, Takuma Browse this author
Takegawa, Nobuyuki Browse this author
Kawamura, Kimitaka Browse this author →KAKEN DB
Kondo, Yutaka Browse this author
Keywords: particle hygroscopicity
urban aerosol
cloud condensation nuclei
Issue Date: 7-Dec-2006
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research
Volume: 111
Start Page: D23204
Publisher DOI: 10.1029/2005JD006980
Abstract: As described by the Köhler theory, the hygroscopicity of atmospheric aerosol particles is a key factor regulating their cloud condensation nuclei (CCN) activity. Here we investigated the relationship between hygroscopicity and CCN activity for urban aerosol particles using a hygroscopicity tandem differential mobility analyzer (HTDMA) coupled in series to a CCN counter. The HTDMA-CCNC system was operated near the center of the Tokyo metropolitan area from 10 to 17 November 2004. For aerosol particles whose dry mobility diameters were 30–200 nm, the ratios of CCN to condensation nuclei (CN) at 0.22–1.3% supersaturation were obtained as a function of particle hygroscopicity at 83 and 89% RH. More-hygroscopic particles were found to be more CCN active than less-hygroscopic particles of the same size, indicating that hygroscopicity is a critical factor regulating CCN activity. The chemical compositions of particles were simultaneously measured using an aerosol mass spectrometer. They were found to relate closely to CCN activity as well as to the hygroscopicity. The measured CCN–hygroscopicity relationships were compared to those predicted by Köhler theory. The results suggest that CCN activity is possibly perturbed by changes in surface tension due to organics, dissolution/dissociation of water-soluble organics under supersaturation conditions, or different nonideality of organics from inorganic salts. These factors associated with organics are potentially important for CCN activity and thus microphysical cloud processes in the atmosphere.
Rights: An edited version of this paper was published by AGU. Copyright 2006, American Geophysical Union, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 111.
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 河村 公隆

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