Collaborative Research: Effects of Ammonia on the Chemical and Physical Properties of Atmospheric Secondary Organic Aerosol

合作研究：氨对大气二次有机气溶胶化学和物理性质的影响

• 批准号: 1719252
• 负责人: Christopher Hennigan
• 金额: $ 33.57万
• 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: 2017
• 资助国家: 美国
• 起止时间: 2017-07-15 至 2021-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1719252&HistoricalAwards=false
• 关键词: Collaborative; Research; Effects; Ammonia; Chemical

This project will investigate the effects of ammonia on the chemical and physical properties of small particles in the atmosphere. It will also look at the effects of ammonia on brown carbon in the atmosphere. The approach will combine ambient measurements, 3-D chemical transport modeling, and the analysis of past field campaign data. This work will provide important insight into the sources and formation processes of secondary organic aerosol, critical for a better understanding of both air quality and climate.The objectives of the proposal are to: (1) Characterize the effects of NH3 on the concentration and reversible/irreversible nature of aqueous SOA (aqSOA); (2) Characterize the effect of NH3 on atmospheric BrC formation; and (3) Determine the spatial and temporal scales of the NH3 impacts on aqSOA and BrC formation. The two processes that will be evaluated include aqueous reactions that are either catalyzed by or directly involve NH4 and represent a significant source of highly oxidized, lower-volatility SOA, and the reaction of NH4 with organic compounds and the production of SOA that may be light-absorbing.Ambient measurements will be made at an urban site in the eastern U.S. that is heavily influenced by biogenic VOC emissions, mobile sources, and regional NH3 emissions from agriculture. Modeling studies, using WRF-CMAQ, will provide an analysis of temporal and spatial variability in the NH3 effects on SOA and BrC formation and the impacts on air quality and climate.

该项目将研究氨对大气中小颗粒的化学和物理特性的影响。 它还将研究氨对大气中棕色碳的影响。 该方法将结合环境测量，3-D化学运输建模和过去现场活动数据的分析。这项工作将为二级有机气溶胶的来源和形成过程提供重要的见解，对于更好地理解空气质量和气候至关重要。该提案的目标是：（1）表征NH3对水溶液浓度和可逆/不可逆性的影响。 （2）表征NH3对大气BRC形成的影响； （3）确定NH3的空间和时间尺度对AQSOA和BRC形成的影响。 将要评估的两个过程包括由NH4催化或直接涉及NH4的水反应，代表了高度氧化，较低的挥发性SOA的重要来源，NH4与有机化合物的反应和SOA的反应和SOA的产生可能会受到轻度吸收性的效果。农业的区域NH3排放。 使用WRF-CMAQ进行建模研究将对NH3对SOA和BRC形成的影响以及对空气质量和气候的影响进行分析。

项目成果

Urban aerosol chemistry at a land–water transition site during summer – Part 1: Impact of agricultural and industrial ammonia emissions

• DOI: 10.5194/acp-21-13051-2021
• 发表时间: 2021-09
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: Nicholas Balasus;Michael A. Battaglia Jr.;K. Ball;V. Caicedo;R. Delgado;A. Carlton;C. Hennigan

Investigating the evolution of water-soluble organic carbon in evaporating cloud water

• DOI: 10.1039/d0ea00005a
• 发表时间: 2021-01
• 期刊: Environmental Science: Atmospheres
• 作者: V. Pratap;A. Christiansen;A. Carlton;S. Lance;P. Casson;Jed Dukett;Hesham Hassan;J. Schwab;C. Hennigan