Contribution of Biogenic Volatile Organic Compounds to Organic Aerosol Formation in the Presence and Absence of Anthropogenic Pollution

这个项目将加深对二次有机气溶胶(SOA)的形成和转化的了解，并将研究生物来源的挥发性有机化合物(BVOC)如何与人为污染相互作用，以改变大气的氧化能力，促进SOA的形成。将于2013年夏天在阿拉巴马州进行南方氧化物和气溶胶研究(SOAS)期间，使用半挥发性热解吸气溶胶气相色谱仪(SVTAG)系统每小时测量一次各种形态的蒸气和颗粒相中间体和半挥发性有机化合物。将在烟雾室研究二次有机化合物及其前体的时间演变，并与SOAS运动的数据进行比较，以确定现场数据是否支持在烟雾室观察到的机制。这项研究将对了解自然排放挥发性有机化合物的森林茂密地区二次有机气溶胶的形成具有重要意义。城市地区空气污染物的排放可能会增加二次气溶胶的形成。该项目收集的数据对于增进区域大气化学、臭氧和二次气溶胶产生及其在气候进程中的作用的知识和预测至关重要。

This project will develop a better understanding of the formation and transformation of Secondary Organic Aerosol (SOA) and will examine how Biogenic Volatile Organic Compounds (BVOC) interact with anthropogenic pollution to alter the atmosphere's oxidative capacity and enhance SOA formation. Hourly measurements will be made, using a Semi-Volatile Thermal desorption Aerosol Gas chromatograph (SVTAG) system, of speciated vapor and particle phase intermediate and semi-volatile organic compounds during the Southern Oxidant and Aerosol Study (SOAS) to be conducted in Alabama in the summer of 2013. The time-evolution of secondary organic compounds and their precursors will be studied a smog chamber and compared with data from the SOAS campaign to ascertain whether mechanisms observed in the smog chamber are supported by the field data. This study will make a significant contribution to understanding the formation of secondary organic aerosol in a heavily forested region with natural emissions of volatile organic compounds. Emissions of air pollutants from urban areas may enhance secondary aerosol formation. The data collected in this project will be critical to advancing the knowledge and prediction of regional atmospheric chemistry, ozone and secondary aerosol production, and their role in climate processes.