EAGER: Quantifying Reversible and Irreversible Aqueous Secondary Organic Aerosol (SOA) Formation in the Atmosphere

该项目将研究马里兰州一个城市地点周围环境气溶胶的季节组成，以更好地了解作为二次有机气溶胶来源的气溶胶中发生的水相反应的贡献。与气体到颗粒的转化不同，SOA在大气中细颗粒物(PM2.5um)质量中占很大比例。然而，最先进的模型对SOA浓度的预测不足表明，缺乏对SOA形成途径的机械性理解。可溶有机气体在水相气溶胶中的吸收和反应被认为是传统模型忽略的一个重要来源。二氧化硫是大气中细颗粒物(PM2.5微米)质量的主要组成部分，影响大气能见度、辐射平衡和人体健康。这项调查符合急切的标准，因为分析工作的一个关键部分(即串联桩的快速切换？颗粒进入液体取样器)的提议是探索性的，该方法在很大程度上未经测试。如果成功，这也将为更广泛、更全面地定义水溶性SOA转化的组成和反应性奠定基础。

The project will examine the seasonal composition of ambient aerosols at an urban site in Maryland to better understand the contribution of aqueous-phase reactions occurring in aerosols as a source secondary organic aerosol (SOA). SOA, in contrast to gas-to-particle conversion, constitutes a major fraction of fine (PM2.5um) particle mass in the atmosphere. However, an under-prediction of SOA concentrations by state-of-the-art models indicates that a mechanistic understanding of SOA formation pathways is lacking. The uptake and reaction of soluble organic gases in aqueous aerosols is argued to be an important source of SOA formation that traditional models have neglected. SOA constitutes a major fraction of fine (PM2.5um) particle mass in the atmosphere, and impacts atmospheric visibility, radiation balance, and also human health. This investigation meets the EAGER criteria because a key part of the analytical work (i.e. fast switching of a tandem PILS ? particle into liquid sampler) the proposal depends upon is exploratory in nature, and the approach largely untested. If successful, this would also provide the foundation for a broader, more comprehensive definition of the composition and the reactivity of water soluble SOA transformation.