Secondary Organic Aerosol Formation in the Southeastern United States

美国东南部二次有机气溶胶的形成

• 批准号: 0802237
• 负责人: Rodney Weber
• 金额: $ 39.45万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-06-01 至 2013-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0802237&HistoricalAwards=false
• 关键词: Secondary; Organic; Aerosol; Formation; Southeastern

This project will investigate lightweight oxidation products from anthropogenic and biogenic volatile organic compounds (VOCs) as a source for secondary organic aerosol (SOA) in urban Atlanta, Georgia. The mechanism through which SOA may be formed involves partitioning of low carbon-number, water-soluble, secondary VOCs to the particle aqueous phase where they are heterogeneously oxidized to lower vapor pressure products. To investigate this process the Principal Investigator (PI) proposes to undertake online measurements of a suite of small organic acid and carbonyl compounds in the gas and aerosol phases, along with additional ancillary measurements. These experiments will be conducted over an extended period of time at a variety of sites to examine factors that influence the gas-particle partitioning and its linkage to hydrophilic/hydrophobic fractions and overall particle water-soluble organic carbon mass. The motivation for the project is the unexpectedly high SOA concentrations observed in urban atmospheres that cannot be explained by current SOA formation chemical mechanisms.

该项目将调查轻质氧化产物的人为和生物源挥发性有机化合物（VOCs）作为来源的二次有机气溶胶（SOA）在城市亚特兰大，格鲁吉亚。 SOA可能形成的机制包括将低碳数、水溶性的二次VOC分配到颗粒水相中，在那里它们被非均相氧化成较低蒸气压的产物。为了研究这一过程，主要研究者（PI）建议对气相和气溶胶相中的一系列小有机酸和羰基化合物进行在线测量，沿着其他辅助测量。 这些实验将在不同地点进行一段较长的时间，以检查影响气体-颗粒分配及其与亲水/疏水部分和总颗粒水溶性有机碳质量的联系的因素。 该项目的动机是在城市大气中观察到的出乎意料的高SOA浓度，无法用目前的SOA形成化学机制来解释。