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

EAGER：量化大气中可逆和不可逆水性二次有机气溶胶 (SOA) 的形成

• 批准号: 1464458
• 负责人: Christopher Hennigan
• 金额: $ 9.94万
• 依托单位: University of Maryland Baltimore County
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-12-01 至 2015-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1464458&HistoricalAwards=false
• 关键词: EAGER; Quantifying; Reversible; Irreversible; Aqueous

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.

该项目将检查马里兰州城市环境气溶胶的季节性组成，以更好地了解气溶胶中发生的水相反应作为二次有机气溶胶（SOA）来源的贡献。 SOA与气体-颗粒物转化相反，构成了大气中细颗粒物（PM2.5um）质量的主要部分。然而，根据预测的SOA浓度的国家的最先进的模型表明，SOA的形成途径缺乏一个机械的理解。水溶胶中可溶性有机气体的吸收和反应被认为是SOA形成的一个重要来源，而传统的模型却忽略了这一点。 SOA构成了大气中细颗粒物（PM2.5um）质量的主要部分，并影响大气能见度，辐射平衡以及人类健康。本研究符合EAGER标准，因为分析工作的关键部分（即串联PILS的快速切换？该建议所依赖的是探索性的，并且该方法在很大程度上未经测试。如果成功的话，这将为更广泛、更全面地定义水溶性SOA转换的组成和反应性奠定基础。