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- Title
Cloud condensation nuclei activity at Jeju Island, Korea in spring 2005.
- Authors
Kuwata, M.; Kondo, Y.; Miyazaki, Y.; Komazaki, Y.; Kim, J. H.; Yum, S. S.; Tanimoto, H.; Matsueda, H.
- Abstract
We measured the number concentrations of cloud condensation nuclei (CCN) and the size distributions of CCN/CN (CN: condensation nuclei) ratios at supersaturations (SSs) of 0.097, 0.27, 0.58, and 0.97% at Jeju-Island, Korea during March-April 2005. Measurements of aerosol inorganic ions, water-soluble organic carbon (WSOC), organic carbon (OC), and elemental carbon (EC) in PM2.5 were simultaneously made. The CCN/CN ratios increased with increasing particle diameter, and the diameter at CCN/CN=0.5 was defined as D50. D50 represents the activation dry diameter of atmospheric particles. The average D50 at SS=0.097% and 0.97% was 136 nm and 31 nm, respectively. The temporal variation of D50 at SS=0.097% was correlated with the mass fraction of water-soluble components (inorganic ions + WSOC), indicating that the temporal variation of CCN activity was mainly controlled by changes in the water-soluble components fraction. The critical dry diameter (Dcrit), which is the threshold dry diameter for CCN activation, was calculated from the observed aerosol chemical com positions by Köhler theory for comparison with D50. The D50 at SS=0.097% was correlated (r²=0.48) with calculated Dcrit, although Dcrit were larger than D50 by 20-29% on average. The systematic difference between D50 and Dcrit could be caused by the size dependence of the aerosol chemical compositions or surface tension lowering caused by the mixing of water-soluble organic compounds. This difference corresponds to a 27±14% uncertainty in the CCN number concentration estimated from the observed particle number size distribution.
- Subjects
CHEJU Strait (Korea); KOREA; CONDENSATION; CLOUDS; ATMOSPHERIC aerosols; ATMOSPHERIC chemistry
- Publication
Atmospheric Chemistry & Physics Discussions, 2007, Vol 7, Issue 6, p15805
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-7-15805-2007