AGS-PRF: Laboratory Studies of the Heterogeneous Oxidation of Organic Compounds Found in Biomass Burning Aerosols by Hydroxyl Radicals

生物质燃烧排放到空气中的大气气溶胶在老化过程中会在大气中发生许多化学反应。这些反应可以显著改变这些颗粒物对空气质量和气候的影响。这位博士后研究员的研究将对简单和复杂的气溶胶混合物中影响这些反应的几个因素进行调查。这项研究的总体目标是通过对有机物质(各种官能团和混合物)和无机成分(硫酸盐和硝酸盐)的多组分混合物进行实验室研究，增加对有机气溶胶上非均相OH氧化机理的理解，这些混合物更接近于大气中BBA的组成复杂性。这一目标将通过四个目标来实现：(1)确定多官能团对OH非均相吸收动力学和氧化产物的影响；(2)检查单一组分有机气溶胶体系的非均相氧化是否与混合物中的不同；(3)确定相对湿度对单一有机体系和混合无机-有机混合物的非均相反应机理的影响；以及(4)整合数据以评估模型BBA体系中的哪些复杂性对非均相氧化机制的影响最大。这一努力的结果将为气候模型者估计气溶胶对气候变化的影响提供有用的信息。

Atmospheric aerosols emitted into the air by biomass burning undergo many chemical reactions in the atmosphere as they age. These reactions can significantly change the impacts that these particles have on air quality and climate. The research conducted by this Postdoctoral Fellow will investigate several factors that can influence these reactions for both simple and complex aerosol mixtures.The overarching goal of this research is to increase the understanding of heterogeneous OH oxidation mechanisms on organic aerosols by performing laboratory studies on multi-component mixtures of organics (variety of functional groups, and mixtures) and inorganic components (sulfate and nitrate), that more closely mimic the compositional complexity of BBA in the atmosphere. This goal will be achieved by four objectives: (1) Determine the effect multi-functional organic groups have on OH heterogeneous uptake kinetics and oxidation products; (2) Examine whether heterogeneous oxidation of single component organic aerosol systems are different than in mixtures; (3) Determine the effect relative humidity has on single organic systems and mixed inorganic-organic mixtures on heterogeneous reaction mechanisms; and (4) Integrate the data to assess what complexities in model BBA systems have the greatest impact on heterogeneous oxidation mechanisms. The results of this effort will provide useful information to climate modelers in estimating the impact of aerosols on climate change.