2012 年 27 巻 1 号 p. 81-89
Generation of sulfuric acid from air containing SO2 and the growth of sulfuric acid aerosol are an important process in the formation of atmospheric aerosol. In this study, laboratory experiments on photo-oxidation of SO2 and generation of secondary sulfuric acid aerosol were carried out. Numerical model on the growth of binary component aerosol of water and sulfuric acid was also developed. The model calculation of generation and growth of secondary sulfuric aerosol was conducted by coupling the aerosol growth model with both overall reaction model of generation of sulfuric acid from SO2 and parameterized homogeneous binary nucleation model. As expected, the present model calculation underestimated the particle growth because the condensation and evaporation of water vapor were not included. However, the model calculations successfully explained the decrease in number concentration and increase in particle size at longer residence time qualitatively.