Collaborative Research: Aerosols, Nitrogen Oxides, and Ozone at the Mt. Bachelor Observatory

合作研究：巴赫山天文台的气溶胶、氮氧化物和臭氧

• 批准号: 1829803
• 负责人: Qi Zhang
• 金额: $ 9.01万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1829803&HistoricalAwards=false
• 关键词: Collaborative; Research; Aerosols; Nitrogen; Oxides

This project supports the continuation of atmospheric measurements at Mt. Bachelor Observatory (MBO) in Central Oregon. The MBO is a high elevation (2.8 km above sea level) observatory that has been utilized for atmospheric chemistry research for the past 15 years. This project will build on the extensive knowledge base of past observations from MBO to examine key controls on western U.S. air quality in the spring, when natural and international anthropogenic sources of O3 and aerosols dominate, and summer, when wildfire smoke is a major driver of regional air pollution. Continuous measurements will be made at MBO of O3, CO, CO2, aerosol mass, scattering and absorption coefficients and meteorology. Three specific hypotheses will be addressed in this research: (1) Daily variations in baseline O3 are driven by large scale dynamics and transport including the El Nino-Southern Oscillation, the Pacific Decadal Oscillation, and the changing climate. The variations in O3 that can be observed in data from both MBO and the TEMPO satellite and are important for downwind air quality in the western U.S. (2) Nitrogen oxide chemistry in biomass burning plumes is controlled by both initial emissions and chemical processing enroute. Production of nitrous acid from aerosol nitrates (organic and inorganic) is an important NOx recycling mechanism and a source of hydroxyl radical. (3) Aerosol properties depend on chemical composition and aging. Light absorption by brown carbon can be comparable or exceed absorption by black carbon and can be linked to specific chemical components or chromophores. Organic aerosol volatility decreases with aging and oxidation.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目支持俄勒冈州中部学士山天文台 (MBO) 继续进行大气测量。 MBO 是一座高海拔（海拔 2.8 公里）观测站，过去 15 年一直用于大气化学研究。 该项目将建立在 MBO 过去观测的广泛知识基础上，研究春季对美国西部空气质量的关键控制措施，春季是臭氧和气溶胶的自然和国际人为来源占主导地位，夏季是野火烟雾是空气质量的主要驱动因素。区域空气污染。 MBO 将对 O3、CO、CO2、气溶胶质量、散射和吸收系数以及气象进行连续测量。 本研究将讨论三个具体假设：（1）基线 O3 的每日变化是由大规模动态和运输驱动的，包括厄尔尼诺南方涛动、太平洋年代际涛动和气候变化。 O3 的变化可以在 MBO 和 TEMPO 卫星的数据中观察到，并且对美国西部的顺风空气质量非常重要。 (2) 生物质燃烧羽流中的氮氧化物化学受到初始排放和途中化学处理的控制。 从气溶胶硝酸盐（有机和无机）生产亚硝酸是重要的氮氧化物回收机制和羟基自由基的来源。 (3) 气溶胶特性取决于化学成分和老化。棕碳的光吸收可以与黑碳的吸收相当或超过，并且可以与特定的化学成分或发色团相关。有机气溶胶的挥发性随着老化和氧化而降低。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Persistent Influence of Wildfire Emissions in the Western United States and Characteristics of Aged Biomass Burning Organic Aerosols under Clean Air Conditions

美国西部野火排放的持续影响以及清洁空气条件下老化生物质燃烧有机气溶胶的特征

• DOI: 10.1021/acs.est.1c07301
• 发表时间: 2022-03
• 期刊: Environmental Science & Technology
• 影响因子: 11.4
• 作者: Farley, Ryan;Bernays, Noah;Jaffe, Daniel A.;Ketcherside, Damien;Hu, Lu;Zhou, Shan;Collier, Sonya;Zhang, Qi
• 通讯作者: Zhang, Qi