Ground-Based Observations of Nitrogen Oxides and Nitrates

该项目将支持在MINUS/MILAGRO活动期间对氮氧化物、硝酸盐、过氧硝酸盐、硝酸和硝酸酐进行测量。整个项目的目标是确定特大城市外流在大气成分和气候强迫方面对区域和全球的化学影响。该仪器将部署在墨西哥城北部的超级地点的地面上，那里将提供一套广泛的气相和气溶胶测量。连续的测量将提供洞察白天和夜间的化学反应，包括活性氮，和信息的相对作用的沉积和混合的硝酸，和生产和去除过程中的有机硝酸盐。 对数据的进一步分析将提供关于城市羽流中各种氧化机制和自由基终止过程的信息，以及涉及氮氧化物化合物的夜间化学的细节，该项目的更广泛影响在于对一名女研究生的支持，以及为其他学生提供培训机会。这些测量将有助于更好地了解对流层臭氧及其前体的复杂化学性质及其在空气污染和气候中的作用。

This project will support measurements of nitrogen oxides, nitrates, peroxynitrates, nitric acid, and nitric acid anhydride during the MIRAGE/MILAGRO campaign. The objectives of the overall project are to determine the regional and global chemical impact of the megacity outflow both in terms of atmospheric composition and climate forcing. This instrument will be deployed on the ground at the supersite north of Mexico City where an extensive suite of gas phase and aerosol measurements will be available. Continuous measurements will provide insights into both daytime and nighttime chemistry involving reactive nitrogen, and information on the relative roles of deposition and mixing of nitric acid, and the production and removal processes of organic nitrates. Further analysis of the data will provide information on various oxidation mechanisms and radical termination processes in an urban plume, as well as details of nighttime chemistry involving nitrogen oxide compounds.The broader impacts of this project lie in the support for a female graduate student, and training opportunities for other students. The measurements will contribute to an improved understanding of the complicated chemistry of tropospheric ozone and its precursors and its role in air pollution and climate.