二次有机气溶胶的气体/粒子分配理论

本文重点评述了二次有机气溶胶形成的气体/粒子分配理论,简要介绍了它的发展和可能的应用.在大气中,气体有机物种的氧化可以产生半挥发性的有机化合物,二次有机气溶胶的形成可以用气体/粒子分配的吸收模型来评估.气体/粒子分配过程决定于半挥发性化合物的成分、浓度和蒸气压,以及吸收性材料的浓度和成分.在气体/粒子分配理论的基础上,人们又研究和开发出二次有机气溶胶的分子组分的气体/粒子分配的热力学模型,它可以用来预估气溶胶中液态水的含量、无机物的分布、亲水性和疏水性有机物的分布.二次有机气溶胶形成的化学机理和气体/粒子分配的热力学模型与加利福尼亚工学院三维都市/区域性大气模型相结合,可以用于气相和气溶胶相模拟.

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The paper reviews the gas/particle partitioning theory for secondray organic aerosol formation and describes its development and possible applications.In atmosphere,semi-volatile organic compounds are formed through oxidation of certain gas-phase organic species and the secondray organic aerosol formation may be best described by a gas/particle partitioning absorption model.The process of gas/particle partitioning is dependent on both the composition,concentration and vapor pressure of semi-volatile species,and the concentration and composition of absorptive materials.On the basis of gas/particle partitioning theory,the thermodynamic model for gas/particle partitioning of molecular constituents has also been developed.This model can be used to predict the liquid water contents in aerosol,distributions of inorganic compounds and hydrophilic/hydrophobic organic compounds.The combination of the chemistry mechanism and the thermodynamic model for secondary organic aerosol formation with the California Institute of Technology((CIT)'s) three-dimensional urban/regional atmospheric model could be used to perform comprehensive gas-and aerosol-phase simulations.