The Impact of Peroxyacyl Nitrates on the Isolation and Transport of NOx in the Rural Midwest Troposphere

9616438伯特曼过氧基硝酸盐(PAN)是大气中总氧化氮的主要成分。需要更多的努力来了解它们的形成、损失和分布，以及它们对当地、区域和全球大气化学的影响。PAN的测量可以灵敏地探测区域影响和与污染物运输有关的全球问题。在该项目中，将在密歇根州佩尔斯顿附近的密歇根大学生物站(UMBS)建造、安装和运行用于测量对流层PAN及其类似物的专用和自动化分析仪器系统。PAN将使用带有电子捕获检测的自动气相色谱进行测量。UMBS网站允许调查有关中西部大气臭氧化学的许多问题。到达该地点的气团要么来自农村地区，要么来自南部的工业/大都市地区。该项目将具有很强的协作性，因为它将与其他科学家进行的臭氧、一氧化碳、氮氧化物、有机硝酸盐、异戊二烯、羰基、气象参数等测量放在同一地点。这些全面的测量还将允许活性氮的详细形态。PAN的测量将有助于更好地了解硝酸盐光产物的季节波动，不同季节异戊二烯光化学的机制，以及导致观察到的物种分布的光化学和传输机制。

9616438 Bertman Peroxyacyl nitrates (PANs) are a major component of total oxidized nitrogen in the atmosphere. More effort is needed to understand their formation, loss and distribution, as well as their impact on local, regional, and global atmospheric chemistry. Measurements of PANs can be sensitive probes of regional influence and of global issues related to pollutant transport. In this project, a dedicated and automated analytical instrument system for measurement of tropospheric PAN and its analogs will be constructed, installed, and operated at the University of Michigan Biological Station (UMBS) located near Pellston, Michigan. PANs will be measured using automated gas chromatography with electron capture detection. The UMBS site allows investigating many questions regarding atmospheric ozone chemistry in the Midwest. Air masses reaching this site are transported either from rural areas or from the industrial/metropolitan areas in the south. The project will have a strong collaborative component since it will be co-located with measurements of ozone, carbon monoxide, nitrogen oxides, organic nitrates, isoprene, carbonyls, meteorological parameters, etc., performed by other scientists. These comprehensive measurements will also allow detailed speciation of reactive nitrogen. The PAN measurements will contribute towards a better understanding of the seasonal fluctuations of nitrate photoproducts, the mechanism of isoprene photochemistry during different seasons, and the photochemical and transport mechanisms that result in the observed species distributions.