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Dependence of CCN activity of less volatile particles on the amount of coating observed in Tokyo

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Title: Dependence of CCN activity of less volatile particles on the amount of coating observed in Tokyo
Authors: Kuwata, M. Browse this author
Kondo, Y. Browse this author
Mochida, M. Browse this author
Takegawa, N. Browse this author
Kawamura, K. Browse this author →KAKEN DB
Keywords: Cloud Condensation Nuclei
black carbon
Issue Date: 7-Jun-2007
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research
Volume: 112
Start Page: D11207
Publisher DOI: 10.1029/2006JD007758
Abstract: A novel observation system has been developed to measure cloud condensation nuclei (CCN) activity simultaneously with volatility of aerosol particles at 400°C. CCN/CN ratios were measured using a CCN counter and a condensation particle counter, and volatility was measured with a volatility tandem differential mobility analyzer (VTDMA). This system was connected to a hygroscopicity tandem differential mobility analyzer in tandem to measure these properties of hygroscopicity-selected particles. These instruments were deployed in Tokyo in November 2004. In Tokyo, the dominant fraction of nonvolatile cores at 400°C has been found to be black carbon (BC). Therefore the number size distribution measured by VTDMA represents the mixing state of black carbon particles. The VTDMA measurement of hygroscopicity-selected particles revealed that most of the less hygroscopic particles were less volatile, while more hygroscopic particles were more volatile. CCN/CN ratios of less volatile particles [(CCN/CN)LV] are estimated from CCN activity and volatility measurements of less hygroscopic particles. (CCN/CN)LV at SS = 0.5% is correlated with the decrease of peak diameter due to volatilization (Δd m), and (CCN/CN)LV is nearly equal to unity at Δd m = 10 nm. This result suggests that the CCN activity of BC particles significantly depends on the amount of coating.
Rights: An edited version of this paper was published by AGU. Copyright 2007, American Geophysical Union, JOURNAL OF GEOPHYSICAL RESEARCH, 112.
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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