Characterization and Apportionment of Primary and Secondary Organic Aerosols during the MIRAGE-Mex Experiment Using GCMS and LCMS Methods

该项目将试图通过将有机气溶胶的气相色谱-质谱仪分析与在水化学领域广泛使用的基于液体色谱的方法相结合，来表征在区域和全球环境的大城市影响--墨西哥城污染流出场活动--期间大气气溶胶的组成和来源。该项目将侧重于极性分子和大分子(分子质量从300-2000个原子质量单位不等)，据信它们来自大气处理，但预计存在于初级排放中。这项研究预计将加强用于研究大气气溶胶中复杂有机混合物的工具，并有助于更好地了解这些气溶胶的来源和组成，以及它们对气候强迫、人类健康和生态系统的影响。一名博士后学者和两名本科生将在该项目的支持下参与大气化学研究。一名本科生将参与该项目的现场操作，另一名本科生将有机会从事用于有机气溶胶分析的分析方法。

This project will attempt to characterize the composition and sources of atmospheric aerosols during the Megacity Impacts on Regional and Global Environments, the Mexico City Pollution Outflow field campaign, by integrating gas chromatography mass spectrometry analysis of organic aerosols with liquid chromatography based methods that have been widely used in the aquatic chemistry field. The project will focus on polar molecules and macromolecules (molecular weights ranging from 300-2000 atomic mass units) which are believed to originate from atmospheric processing but are expected to exist in primary emissions. This study is expected to result in the enhancement of tools used to study complex organic mixtures in atmospheric aerosols and lead to a greater understanding of the origin and composition of these aerosols, as well as their impacts on climate forcing, human health and the ecosystem. A post-doctoral scholar and two undergraduate students will participate in atmospheric chemistry research under the auspices of this project. One undergraduate student will participate in the field operations of the project and a second will have the opportunity to work on analytical methods used for organic aerosol analysis.