| The quantitative calculation of aerosol activation capacity is one of the most critical aspects of the assessment of global climate effects. In this paper,the cloud condensation and aerosol hygroscopicity data were observed at Mt.Huang from September to October in 2012. Based on the Sigmoidal Function of size-resolved activation curve, we calculated the aerosol hygroscopicity,and on this basis,the aerosol hygroscopicity was closed to analyze the time and scale of aerosol hygroscopicity. In addition, using the constructed size-resolved aerosol hygroscopicity, the activation ability of aerosol was analyzed by using the κ-Kohler theory, and the concentration of CCN was calculated using different parameterization schemes.Results show that:The aerosol hygroscopic parameter prediction value κCCN based on the Sigmoidal Function fitting of size-resolved activation curve, has a high prediction accuracy for the hygroscopicity of strong hygroscopic modes aerosol at all particle sizes we observed. The hygroscopicity of each size aerosol showed obvious diurnal variation characteristics. The change of hygroscopicity of small particles was larger than the change of large particles, since the high degree of internal mixing and uniform chemical composition of large particles. The hygroscopicity of aerosol decreased at first and then increased with the increase of the particle size, and the hygroscopicity of aerosol during the day was higher than the hygroscopicity at night.Analysis of the closure effect of different parameterized schemes show that: the parameterization scheme of the hygroscopicity probability distribution provides the best estimate of CCN closure,with coefficient of determination R2=0.89 and Slopee=1.11. This parameterization can calculate the CCN concentration much accurately than the other parameterization scheme that is best for the prediction of the concentration of CCN at Mt.Huang... |
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