AGS-PRF: Atmospheric Lifecycle of Organic Carbon Through Multiple Generations of Aging

AGS-PRF：通过多代老化的有机碳的大气生命周期

• 批准号: 1433432
• 负责人: Gabriel Isaacman-VanWertz
• 金额: $ 8.6万
• 依托单位: Isaacman-VanWertz, Gabriel A
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-02-01 至 2017-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1433432&HistoricalAwards=false
• 关键词: AGS; PRF; Atmospheric; Lifecycle; Organic

This is a Postdoctoral Research Fellowship with the objective of characterizing the chemical properties of gas- and particle-phase carbon in the atmosphere. Laboratory experiments will be conducted in an environmental chamber to observe the formation of secondary organic aerosol and the aging of organic compounds over several days. The results will lead to a better understanding of the atmospheric carbon cycle essential for developing policies that mitigate the effects of organic carbon on air quality and climate.The experiments will take place in a reaction chamber at MIT using a Total Gas-phase Organics (TGO) instrument, an Aerodyne Aerosol Mass Spectrometer (AMS), a Chemical Ionization Mass Spectrometer (CIMS), and other instrumentation to provide detailed compositional data about specific classes of compounds and their oxidation products. Up to three days of atmospheric aging will be simulated in the reaction chamber through the atmospheric oxidation of precursors using the photolytic formation of hydroxyl radical from a steady stream of nitrous acid. Several reduced parameter chemical representations will be developed to describe the chemical properties and chemical transformations of organic aerosol and to model its oxidation pathways in the atmosphere. The experiments will help to constrain the budget of total carbon in the atmosphere.

这是一项博士后研究奖学金，旨在表征大气中气相和颗粒相碳的化学性质。实验室实验将在环境室中进行，以观察数天内二次有机气溶胶的形成和有机化合物的老化。研究结果将有助于更好地了解大气碳循环，这对于制定减轻有机碳对空气质量和气候影响的政策至关重要。实验将在麻省理工学院的反应室中进行，使用总气相有机物（TGO） ）仪器、Aerodyne 气溶胶质谱仪 (AMS)、化学电离质谱仪 (CIMS) 和其他仪器，可提供有关特定类别化合物及其氧化产物的详细成分数据。通过使用稳定的亚硝酸流光解形成羟基自由基，通过前体的大气氧化，在反应室中模拟长达三天的大气老化。将开发几种简化参数的化学表示法来描述有机气溶胶的化学性质和化学转化，并对其在大气中的氧化途径进行建模。这些实验将有助于限制大气中总碳的预算。