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Detailed Reference Information |
Laakso, L., Kulmala, M. and Lehtinen, K.E.J. (2003). Effect of condensation rate enhancement factor on 3-nm (diameter) particle formation in binary ion-induced and homogeneous nucleation. Journal of Geophysical Research 108: doi: 10.1029/2003JD003432. issn: 0148-0227. |
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Charges in aerosol particles enhance condensation flux of polar molecules onto particles. In this paper, the effect of condensation enhancement due to Coulomb forces was investigated. The main aim is to find out the upper limit of the effect and its significance on nucleation mode particle growth dynamics. The enhancement factor seems to be below 5 for charged particle growth from 1.5 to 10 nm in particle radius. However, only a limited amount of particle population is charged, and the overall effect maximum effect was less than 2. This, combining with a vapor concentration of about 1 ¿ 107 molecules cm-3, is enough to explain nucleation mode growth of 1 nm h-1. Also, the effect of enhanced condensation on total observed aerosol concentration was simulated using an aerosol dynamic model. In the case of neutral nucleation, the effect is negligible for small enhancement factor (EF). With higher EF the final concentration was found to decrease. In the case of ion-induced nucleation the effect varied with preexisting particle concentration and enhancement factor. |
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Abstract |
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Keywords
Atmospheric Composition and Structure, Aerosols and particles (0345, 4801), Meteorology and Atmospheric Dynamics, Theoretical modeling, Meteorology and Atmospheric Dynamics, General or miscellaneous |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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