Secondary Species Associated with Ozone Formation in Eastern North America

9713567西尔曼该计划调查与臭氧形成有关的次生物种的化学，特别是总反应氮化合物(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。这些化学物质在最近的一些实地测量活动中以及在美国东部计划的未来活动中进行了测量，包括田纳西中部的臭氧研究、美国东北部走廊的NARSTO研究以及密歇根州佩里斯顿的臭氧光化学和气候学实验。实地数据将作为将为该项目开发和评估的光化学模型的投入。模型结果将与关键有机过氧化物率的实测值以及臭氧、氮氧化物和活性有机碳氢化合物(ROG)的其他化学指标进行比较。模型计算中将特别强调大气中过氧化氢和硝酸的去除速率，以及有机过氧化氢化学中最近提出的变化和不确定因素。将尝试通过比较不同模型情景的测量结果来计算大气中过氧化氢和硝酸的清除率。将调查使用过氧化物作为臭氧-NOx-ROG指示剂的影响。这个模拟项目的结果将提供对美国东北部大陆城市和农村地区对流层下部发生的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.