CAREER: Characterizing Acid-Catalyzed Secondary Organic Aerosol Formation in the Atmosphere

职业：表征大气中酸催化的二次有机气溶胶的形成

• 批准号: 1454763
• 负责人: Christopher Hennigan
• 金额: $ 52.46万
• 依托单位: University of Maryland Baltimore County
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-15 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1454763&HistoricalAwards=false
• 关键词: CAREER; Characterizing; Acid; Catalyzed; Secondary; CAREER; Characterizing; Acid; Catalyzed; Secondary

With this CAREER Award, the Environmental Chemical Sciences Program of the Division of Chemistry is supporting the research of Professor Christopher J. Hennigan at the University of Maryland, Baltimore County. Professor Hennigan is characterizing the effects of acid-catalyzed reactions on the atmospheric transformation of volatile organic compounds into secondary organic aerosol (SOA). SOA is a ubiquitous and highly abundant component of fine particle mass in the atmosphere, contributing to aerosol effects on human health and climate. This research bridges the apparent disagreement between laboratory and ambient studies on the role of particle acidity in forming SOA. These studies seek to achieve an improved representation of SOA formation in models and thus, may lead to improved predictive capabilities of ambient aerosol loadings. Professor Hennigan is integrating the research with educational activities that broaden access of underrepresented groups to research in environmental chemistry. This will be facilitated through the Meyerhoff Scholars Summer Bridge Program, and through the organization of outreach that connects high school students with undergraduates pursuing environmental chemistry research.In this work, new methodology is being developed for the fast, near real-time measurement of particle acidity. The result will be an automated system that provides the best combination of high time resolution and accuracy of any aerosol pH measurement or estimation method to-date. The system is being deployed to characterize the effects of acid catalysis on the gas-particle partitioning of semi-volatile organic compounds in the atmosphere. The ambient measurements will span multiple seasons to capture a diverse array of meteorological conditions and source influences. The work seeks to provide a detailed understanding of a process in which biogenic emissions are transformed by anthropogenic pollutants in the atmosphere. This has implications for understanding the broader impact of human activities on changes in air composition and quality and consequential impacts upon climate.

通过这项职业奖，化学系的环境化学科学计划支持巴尔的摩县马里兰州大学马里兰州的克里斯托弗·J·亨尼根教授的研究。 Hennigan教授正在表征酸催化反应对挥发性有机化合物大气转化为次级有机气溶胶（SOA）的影响。 SOA是大气中精细颗粒质量的普遍存在且高度丰富的成分，导致气溶胶对人类健康和气候的影响。 这项研究桥接了实验室与环境研究之间关于颗粒酸度在形成SOA的作用的明显分歧。 这些研究试图在模型中提高SOA形成的改进表示，因此可能会提高环境气溶胶载荷的预测能力。 Hennigan教授将研究与教育活动相结合，以扩大代表性不足的群体来研究环境化学研究。 这将通过Meyerhoff学者夏季桥梁计划以及通过将高中生与追求环境化学研究的大学生联系起来的外展活动来促进这一点。在这项工作中，正在为快速的，接近实时的实时测量粒子酸度开发新的方法。 结果将是一个自动化系统，该系统提供了迄今为止任何气溶胶pH测量或估计方法的最佳组合。 该系统正在部署，以表征酸性催化对大气中半挥发性有机化合物的气体粒子分配的影响。 环境测量结果将跨越多个季节，以捕获各种气象条件和来源影响。这项工作旨在提供对一个过程的详细理解，在这种过程中，大气中的人为污染物会改变生物学排放。这对理解人类活动对空气组成，质量以及结果对气候的影响的更广泛影响具有影响。