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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Modeling the formation of secondary organic aerosol in coastal areas: Role of the sea-salt aerosol organic layer - art. no. 4440
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Modeling the formation of secondary organic aerosol in coastal areas: Role of the sea-salt aerosol organic layer - art. no. 4440

机译：模拟沿海地区次生有机气溶胶的形成：海盐气溶胶有机层的作用-艺术。没有。 4440

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1] In recent models the formation of secondary organic aerosol has been described by absorption of semivolatile oxidation products to an organic aerosol mixture and/or dissolution into an aerosol aqueous phase. In coastal areas, freshly formed sea-salt aerosol absorbs secondary semivolatile organic oxidation products into its surface organic layer, which consequently allows for the partitioning of the secondary organics to the sea-salt aerosol brine core. This process is modeled in the present study. Equilibrium between the gas phase and a continental primary organic aerosol phase, a sea-salt organic layer, and a continental aqueous aerosol is maintained, as is equilibrium between the organic layer and the brine core. Within aqueous phases, dissociation of acidic species is considered, and charge balance determines pH. Six semivolatile organic oxidation products that have been observed as secondary organic aerosol constituents, eight primary organic aerosol constituents representative of urban aerosols, five sea-salt organic layer species, and four organic components of the brine core are described molecularly. Numerical iteration techniques are used to solve the relevant nonlinear governing equations for the concentrations of each product in each aerosol phase and the gas phase, as well as for the pH of the relevant aqueous phases. Variables of interest include ambient temperature and species concentrations. Results indicate that the aqueous aerosols and the sea-salt aerosol brine core are the most efficient media for absorption under the conditions described, that organic layers enhance the partitioning to the brine core, and that secondary organic acids contribute to the acidification of the sea-salt aerosol brine core. [References: 61
机译：[1]在最近的模型中，已经描述了通过将半挥发性氧化产物吸收到有机气溶胶混合物中和/或溶解到气溶胶水相中来形成二次有机气溶胶。在沿海地区，新近形成的海盐气溶胶将次级半挥发性有机氧化产物吸收到其表面有机层中，从而使次级有机物分配到海盐气溶胶盐水核中。此过程在本研究中建模。气相与大陆性主要有机气溶胶相，海盐有机层和大陆性气溶胶之间保持平衡，有机层与盐水核心之间也保持平衡。在水相中，考虑了酸性物质的离解，电荷平衡决定了pH。从分子上描述了六个半挥发性有机氧化产物，这些产物被视为次要有机气溶胶成分，代表城市气溶胶的八个主要有机气溶胶成分，五个海盐有机层种类以及盐水芯的四个有机成分。使用数值迭代技术来求解有关每个气溶胶相和气相中每种产物的浓度以及有关水相的pH值的相关非线性控制方程。感兴趣的变量包括环境温度和物质浓度。结果表明，在所述条件下，水性气溶胶和海盐气溶胶盐水核是最有效的吸收介质，有机层增强了对盐水核的分配，并且次级有机酸有助于海藻酸化。盐雾气溶胶盐水芯。 [参考：61

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