Cloud condensation nuclei activity at Jeju Island, Korea in spring 2005

M. Kuwata, Y. Kondo, Y. Miyazaki, Y. Komazaki, J. H. Kim, Seong Soo Yum, H. Tanimoto, H. Matsueda

Research output: Contribution to journalArticle

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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. We made simultaneous measurements of aerosol inorganic ions, water-soluble organic carbon (WSOC), organic carbon (OC), and elemental carbon (EC) in PM2.5. 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±17 nm and 31±3 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 compositions by Köhler theory for comparison with D50. The D50 at SS=0.097% was correlated (r2=0.48) with calculated Dcrit, although D crit was 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.

Original languageEnglish
Pages (from-to)2933-2948
Number of pages16
JournalAtmospheric Chemistry and Physics
Volume8
Issue number11
DOIs
Publication statusPublished - 2008 Jun 2

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cloud condensation nucleus
supersaturation
organic carbon
aerosol
temporal variation
water
chemical composition
atmospheric particle
ion
surface tension
condensation
organic compound
carbon

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Kuwata, M., Kondo, Y., Miyazaki, Y., Komazaki, Y., Kim, J. H., Yum, S. S., ... Matsueda, H. (2008). Cloud condensation nuclei activity at Jeju Island, Korea in spring 2005. Atmospheric Chemistry and Physics, 8(11), 2933-2948. https://doi.org/10.5194/acp-8-2933-2008
Kuwata, M. ; Kondo, Y. ; Miyazaki, Y. ; Komazaki, Y. ; Kim, J. H. ; Yum, Seong Soo ; Tanimoto, H. ; Matsueda, H. / Cloud condensation nuclei activity at Jeju Island, Korea in spring 2005. In: Atmospheric Chemistry and Physics. 2008 ; Vol. 8, No. 11. pp. 2933-2948.
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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. We made simultaneous measurements of aerosol inorganic ions, water-soluble organic carbon (WSOC), organic carbon (OC), and elemental carbon (EC) in PM2.5. 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±17 nm and 31±3 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 compositions by K{\"o}hler theory for comparison with D50. The D50 at SS=0.097{\%} was correlated (r2=0.48) with calculated Dcrit, although D crit was 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.",
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Kuwata, M, Kondo, Y, Miyazaki, Y, Komazaki, Y, Kim, JH, Yum, SS, Tanimoto, H & Matsueda, H 2008, 'Cloud condensation nuclei activity at Jeju Island, Korea in spring 2005', Atmospheric Chemistry and Physics, vol. 8, no. 11, pp. 2933-2948. https://doi.org/10.5194/acp-8-2933-2008

Cloud condensation nuclei activity at Jeju Island, Korea in spring 2005. / Kuwata, M.; Kondo, Y.; Miyazaki, Y.; Komazaki, Y.; Kim, J. H.; Yum, Seong Soo; Tanimoto, H.; Matsueda, H.

In: Atmospheric Chemistry and Physics, Vol. 8, No. 11, 02.06.2008, p. 2933-2948.

Research output: Contribution to journalArticle

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T1 - Cloud condensation nuclei activity at Jeju Island, Korea in spring 2005

AU - Kuwata, M.

AU - Kondo, Y.

AU - Miyazaki, Y.

AU - Komazaki, Y.

AU - Kim, J. H.

AU - Yum, Seong Soo

AU - Tanimoto, H.

AU - Matsueda, H.

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N2 - 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. We made simultaneous measurements of aerosol inorganic ions, water-soluble organic carbon (WSOC), organic carbon (OC), and elemental carbon (EC) in PM2.5. 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±17 nm and 31±3 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 compositions by Köhler theory for comparison with D50. The D50 at SS=0.097% was correlated (r2=0.48) with calculated Dcrit, although D crit was 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.

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