Studies of the Fluxes of Atmospheric Organic Nitrogen Compounds to a Forest Environment

该项目研究中度污染的森林环境中有机氮化合物的形成和归宿。 这些化合物可能在氮循环和大气二氧化碳封存中发挥着至关重要的作用——人们对陆地生物圈和周围大气之间的相互作用知之甚少，并且目前森林生态系统中碳封存相关人员尚未广泛考虑这一研究领域。 具体来说，该项目将开发测量某些选定的硝酸烷基酯（异构）异戊二烯硝酸盐和过氧酰基硝酸盐（包括过氧乙酰硝酸盐（PAN））通量的能力，生产用于硝酸异戊二烯绝对校准的标准品，并通过在森林环境中的沉积来表征有机硝酸盐的归宿。 该项目将在密歇根大学生物站的氧化剂研究计划：光化学、排放和运输 (PROPHET) 现场进行。 有机硝酸盐与羟基自由基 (OH) 反应的动力学也将在实验室进行研究。 就更广泛的影响而言，该项目将描述一些潜在重要的森林与大气相互作用的特征，深入了解氮循环在陆地森林生态系统碳循环中的作用，并提高目前对森林生物地球化学的理解。 该项目将通过技术转让向许多年轻科学家（其中许多是女性）提供奖学金和能力建设，并通过机构和 PROPHET 计划外展 - 通过更大的 NSF 综合研究生教育和研究培训 (IGERT) 和生物圈大气研究和培训 (BART) 计划 - 促进更广泛的社区教育和参与。

This project investigates the formation and fate of organic nitrogen compounds in a moderately polluted forest environment. Such compounds may play a crucial role in nitrogen cycling and sequestration of atmospheric carbon dioxide - interactions between the terrestrial biosphere and the ambient atmosphere are understood poorly and present an area of study not widely considered at this time by those concerned with carbon sequestration in forest ecosystems. Specifically, the project will develop the capacity for measuring fluxes of some selected alkyl nitrates - (isomeric) isoprene nitrate(s) and peroxyacyl nitrates including peroxyacetyl nitrate (PAN), producing standard(s) for absolute calibration of isoprene nitrate, and characterizing the fate of organic nitrates through deposition within a forest environment. This project will be conducted at the Program for Research on Oxidants: Photochemistry, Emissions, and Transport (PROPHET) field site at the University of Michigan Biological Station. Kinetics of organic nitrate reactions with the hydoxyl radical (OH) will also be investigated in the laboratory. With regard to broader impacts, the project will characterize some potentially important forest-atmosphere interactions, offer insight into the role of nitrogen cycling in the carbon cycle within terrestrial forest ecosystems, and improve present understanding of forest biogeochemistry. The project will provide scholarship and capacity building through technology transfer to a number of young scientists, many of those women, and through institutional and PROPHET program outreach - through the larger NSF Integrative Graduate Education and Research Traineeship (IGERT) and Biosphere Atmosphere Research and Training (BART) programs - facilitate broader community education and involvement.