关键词: 云凝结核数浓度, 有机气溶胶, 混合状态

Abstract: The κ-K?hler theory and a simulation of the aerosol mass concentrations in China for the year 2006 were used to calculate the number concentration of cloud condensation nuclei (CCN) in China and evaluate the contribution of organic aerosol (OA). The number concentrations of CCN in China show a west-to-east gradient, due to the stronger anthropogenic emissions in eastern China. Assuming that all aerosol chemical components are externally mixed, the number concentrations of CCN are 0.9×10³-1.2×10³ cm^-3 seasonally, and OA contributes 30% to the annual mean. Assuming that OA components are internally mixed, while inorganic aerosols are externally mixed, the number concentrations of CCN are 0.9×10³-1.1×10³ cm^-3, and OA contributes 28% to the annual mean. Though the differernce of annual average contribution of OA to CCN number is small when OA is external and internal mixed, there is large different spatially in summer and winter due to more secondary OA in summer and more primary OA in winter. The results show that OA are important sources of CCN in China.

Key words: cloud condensation nuclei number concentration, organic aerosol, mixing state