Secondary Species Associated with Ozone Formation in Eastern North America

9713567 西尔曼 该项目调查与臭氧形成有关的次级物种的化学性质，特别是总活性氮化合物（NOy）、过氧乙酰硝酸盐（PAN）和相关的有机硝酸盐、过氧化氢和有机过氧化物。这些化学物质已经在最近的一些实地测量活动中进行了测量，并计划在美国东部进行未来的活动，包括田纳西州中部臭氧研究、美国东北部走廊的NARSTO研究以及密歇根州Peliston的臭氧光化学和气候学实验。 实地数据将作为为该项目开发和评估的光化学模型的输入。 模型结果将与关键有机过氧化物比率的测量值进行比较，沿着还有臭氧、氮氧化物和活性有机碳氢化合物的其他化学指标。 将特别强调模型计算中过氧化物和硝酸在大气中的去除率，以及最近提出的有机过氧化物化学变化和不确定性。将试图通过比较不同模型设想的测量结果，得出过氧化物和硝酸在大气中的清除率。将调查使用过氧化物作为臭氧-NOx-ROG指标的影响。 该模拟项目的结果将提供对美国东北部城市和农村大陆地区对流层低层臭氧形成过程的严格和详细的评估。

9713567 Sillman The project investigates the chemistry of secondary species associated with ozone formation, specifically total reactive nitrogen compounds (NOy), peroxyacetyl nitrate (PAN) and associated organic nitrates, hydrogen peroxide and organic peroxides. These chemical species have been measured during a number of recent field measurement campaigns and for planned future campaigns in the eastern U.S., including the Middle Tennesee Ozone Study, the NARSTO study in the northeastern U.S. corridor, and the Ozone Photochemistry and Climatology Experiment in Peliston, MI. The field data will serve as input into the photochemical models to be developed and evaluated for this project. Model results will be compared with measured values for ratios of key organic peroxide compounds, along with other chemical indicators for ozone, NOx and reactive organic hydrocarbons (ROG). Special emphasis will be placed on atmospheric removal rates for peroxides and nitric acid in model calculations, and on recent proposed changes and uncertainties in organic peroxide chemistry. An attempt will be made to derive atmospheric removal rates for peroxides and nitric acid by comparing measurements with different model scenarios. Implications for the use of peroxides as ozone-NOx-ROG indicators will be investigated. Results from this modeling project will provide rigorous and detailed evaluations of ozone formation processes occurring in the lower troposphere over urban and rural continental areas of the northeastern U.S.