Development of Critical Data for Predicting Growth of Secondary Organic Aerosols in Air

开发预测空气中二次有机气溶胶增长的关键数据

• 批准号: 1207112
• 负责人: Barbara Finlayson-Pitts
• 金额: $ 69.25万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-15 至 2016-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1207112&HistoricalAwards=false
• 关键词: Development; Critical; Data; Predicting; Growth

This project is comprised of a series of studies to measure the uptake coefficients for semi-volatile organic compounds (SVOC) on secondary organic aerosols (SOA) formed from the oxidation of a variety of gas phase precursors. The rationale for these investigations is that SOA growth is better described by a kinetically limited mechanism than one based on equilibrium phase partitioning, and that uptake coefficients for various SVOC on typical atmospheric SOA are needed in order to model SOA growth more accurately. However, uptake coefficients data on SOA are limited. The activities therefore include studies of the generation and composition of SOA formed from oxidation of SOA precursors by nitrate radical or/and ozone inside a large-volume, slow-flow aerosol flow tube; studies of the uptake of organic nitrates and SVOC on SOA as well as studies of possible evaporation of SOA components using attenuated total reflectance Fourier transform infrared spectrometry (ATR-FTIR); measurements of absolute uptake coefficients of organic nitrates and SVOC on SOA using a Knudson cell and a coated wall fast flow reactor; characterization of the uptake of organic nitrates and SVOC on self-assembled monolayers; and analysis of SOA using nano-secondary ion mass spectrometry (nano-SIMS). The research will yield information important in assessing the relative importance of kinetically limited mechanisms versus equilibrium partitioning in SOA growth.Broader impacts include providing kinetic data and molecular insights on the uptake of semi-volatile organic compounds onto secondary organic aerosol, disseminating results broadly through publications, summer teacher workshops, hosted lab tours for students and the general public, visits of researchers to local schools, training of undergraduate and graduate students and postdoctoral fellows, continued involvement of underrepresented groups in the principal investigator's research activities, and development of new experiments for the undergraduate curriculum at UC-Irvine.

该项目由一系列研究组成，用于测量由多种气相前体的氧化形成的二级有机气溶胶（SOA）上半挥发性有机化合物（SVOC）的摄取系数。这些研究的理由是，与基于平衡相分配的机制相比，动力学上有限的机制更好地描述了SOA的生长，并且需要对典型大气SOA进行各种SVOC的吸收系数，以便更准确地对SOA增长进行建模。但是，SOA上的摄取系数数据受到限制。因此，活动包括研究由硝酸盐自由基或/和/和臭氧在大容量的，慢流动性气溶胶流动管内的SOA前体氧化形成的SOA的生成和组成；研究有机硝酸盐和SVOC对SOA的摄取以及使用衰减的总反射率傅立叶变换红外光谱法（ATR-FTIR）可能蒸发SOA成分的研究；使用Knudson细胞和涂层壁快速流动反应器测量有机硝酸盐和SVOC的绝对摄取系数和SVOC的测量；对自组装单层的有机硝酸盐摄取和SVOC的摄取的表征；以及使用纳米级别离子质谱法（纳米SIMS）对SOA进行分析。这项研究将产生有关评估动力学有限机制与平衡分配在SOA增长中的相对重要性重要的信息。BoarDer的影响包括提供动力学数据和分子见解，对半挥发性有机化合物的吸收，将次要的有机物的研究范围扩大到出版物中，访问夏季教师的临时访问者，访问夏季教师的临时访问者，访问临时的有机物，并将其传播为夏季，访问了夏季的教师，并访问了夏季教师，主持人，主持人，主持人，主持人，主持人，主持人，主持人，主持人，访问了临时的有机物，并将其传播到临时的访问者中，并将其传播到临时的访问者中，并将其传播到临时的访问者中，这学校，对本科生和研究生和博士后研究员的培训，不断分配的小组继续参与主要研究人员的研究活动，并开发了UC-Irvine本科课程的新实验。