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Dependence of CCN activity of less volatile particles on the amount of coating observed in Tokyo
| 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 | | volatility | | 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) |
| URI: | http://hdl.handle.net/2115/26172 |
| 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)
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Submitter: 河村 公隆
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