Aerosol complexity in megacities: From size-resolved chemical composition to optical properties of the Beijing atmospheric particles

摘要: Megacities need adapted tools for the accurate modeling of aerosol impacts. For this purpose a new experimental data processing has been worked out Beijing aerosols as case study. Size-resolved particles were extensively sampled during winter and summer 2003 subsequently fully chemically characterized. The product is an model presenting particle pattern (mode number, size chemistry) without any prerequisite constrain either on mode number or each chemical composition. Six modes found five them consistently appear internally mixed organized around black carbon dust core coated by organic and/or inorganic material. Data checked robust comparisons with other (particle sunphotometer-derived derived data). We presence two accumulation in different internal mixing optical calculations show that single scattering albedo (ωo # 0.90) significantly higher than expected. Such approach would allow realistic atmospheric impacts under complex situations.