The distribution of ammonium salts among a size and composition dispersed aerosol |
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| Institution: | 1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Environment, Beijing Normal University, Beijing 100875, China;4. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;5. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;6. Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China |
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| Abstract: | The chemical and physical processes that govern the distribution of ammonium salt condensate over a size- and composition-dispersed aerosol particle population are considered. From an analysis of the concentration profiles of ammonia, nitric acid, and hydrochloric acid vapors surrounding an aerosol particle, the single particle fluxes of these species are derived. By evaluating the time scales for equilibration of the vapor-phase species with a population of aerosol particles, it is found that ammonium salts in the gas and aerosol phases are not always in equilibrium, especially under less polluted and cooler conditions. The principles that govern the distribution of ammonium salts on aerosol particles of different size and composition are identified, and it is found that thermodynamic equilibrium often does not uniquely determine the distribution of ammonium salt condensate. Thus it is concluded that both transport and thermodynamic properties of the aerosol population govern the distribution of ammonium salt condensate. |
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