A Multiphase Study of the Nature, Sources, and Fate of Atmospheric Organic Nitrogen

大气有机氮的性质、来源和归宿的多相研究

• 批准号: 0542701
• 负责人: Paul Shepson
• 金额: $ 68.99万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-02-01 至 2013-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0542701&HistoricalAwards=false
• 关键词: Multiphase; Study; Nature; Sources; Fate

This project addresses the sources, fate, and importance of atmospheric organic nitrates, and the role of biogenic volatile organic compounds (BVOCs) in sequestering atmospheric nitrogen in forest environments. This research is important in the broader context of understanding forest uptake of carbon dioxide, including future changes as climate and anthropogenic inputs of atmospheric nitrogen change. The project includes field studies aimed at identification of the important pathways for organic nitrate formation in both the gas phase, and in cloud water. The field studies will be conducted at the University of Michigan Biological Station (UMBS) Program for Research on Oxidants: Photochemistry, Emissions, and Transport (PROPHET) laboratory. The cloud water studies will make use of the Airborne Laboratory for Atmospheric Research (ALAR), a small, instrumented aircraft operated by Purdue University.The main objectives of the project are: (1) Measurements of the vertical profile of atmospheric organic nitrates, using a tethered balloon with sampling equipment to examine the role of isoprene and other BVOCs in sequestering atmospheric nitrogen; (2) Investigation of the role of very reactive biogenic volatile organic compounds in the atmosphere above the UMBS forest, using a newly developed Proton Transfer Reaction Linear Ion Trap (PTRLIT); also laboratory studies of the kinetics and mechanisms for the formation of atmospheric organic nitrates from BVOCs; (3) A study of the ability of microorganisms to process cloud water nitrogen (using a cloud water collector), including an investigation of the potential production of light alkyl nitrates in cloud water; (4) Laboratory photochemical reactor studies of aqueous phase production of alkyl nitrates to improve our ability to predict the fate of atmospheric nitrogen.The project will provide opportunities for undergraduate and graduate student development and training, and also involve significant outreach and education activities through the Purdue Climate Change Research Center (PCCRC). Specifically, an exhibit will be created about the relationships between human activities, agricultural practices, atmospheric nitrogen, and climate change. The exhibit will involve hands-on interactive computer simulations of the relationships between land use change and climate, and will be produced with the intention of making it available to science and technology museums around the country.

该项目讨论了大气中有机硝酸盐的来源、归宿和重要性，以及生物挥发性有机化合物（BVOCs）在森林环境中封存大气氮中的作用。这项研究在更广泛的背景下理解森林对二氧化碳的吸收，包括未来的气候变化和大气氮变化的人为输入是重要的。该项目包括实地研究，旨在确定有机硝酸盐在气相和云水中形成的重要途径。现场研究将在密歇根大学生物站（UMBS）氧化剂研究计划：光化学，排放和运输（PROPHET）实验室进行。云水研究将利用普渡大学的一架装有仪器的小型飞机-大气研究空中实验室进行，该项目的主要目标是：（1）利用带有取样设备的系留气球测量大气有机硝酸盐的垂直分布，以研究异戊二烯和其他BVOCs在隔离大气氮方面的作用;（2）利用新开发的质子转移反应线性离子阱（PTRLIT），调查UMBS森林上空大气中活性很强的生物源挥发性有机化合物的作用;还对BVOCs形成大气有机硝酸盐的动力学和机制进行实验室研究;（3）微生物处理云水氮能力的研究（使用云水收集器），包括调查云水中可能产生的硝酸轻烷基酯;（四）实验室光化学反应器研究硝酸烷基酯的水相生产，以提高我们预测大气中氮的去向的能力。该项目将为本科生和研究生的发展和培训，并通过普渡大学气候变化研究中心（PCCRC）涉及重大的推广和教育活动。具体而言，将创建一个关于人类活动，农业实践，大气氮和气候变化之间关系的展览。该展览将涉及对土地使用变化与气候之间关系的动手互动计算机模拟，并将制作该展览，以便向全国各地的科技博物馆提供。