Leaf-level to Canopy NOx and Ozone Exchanges at University of Michigan Biological Station (UMBS) during PHotochemistry, Emissions, and Transport (PROPHET) 2016

2016 年光化学、排放和运输 (PROPHET) 期间密歇根大学生物站 (UMBS) 的叶层到冠层氮氧化物和臭氧交换

• 批准号: 1561755
• 负责人: Detlev Helmig
• 金额: $ 37.06万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-05-01 至 2019-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1561755&HistoricalAwards=false
• 关键词: Leaf; level; Canopy; NOx; Ozone

This project is part of a summer field study to gain a better understanding of reactive chemistry in the atmosphere of a forested environment. In this project, the exchange of nitrogen compounds at the leaf-level will be investigated to better predict the production of ozone, secondary organic aerosols and the cycling of nitrogen between the atmosphere and the biosphere. Improving the understanding of reactive chemistry in forest environments will improve projections of how future changes in forest succession and climate might affect the future composition of the atmosphere. The specific objectives of this study are to: (1) determine leaf exchanges of NO, NO2, NOy, and ozone for the dominant tree species at the University of Michigan Biological Station's (UMBS) Program for Research on Oxidants: PHotochemistry, Emissions, and Transport (PROPHET) site; (2) determine the dependency of the leaf-level gas exchanges on the physiological and environmental factors including photosynthesis, stomatal conductance, light, temperature, and humidity; (3) determine the dependency of the leaf-level gas exchanges on the ambient NOx and ozone mixing ratio; (4) Investigate potential connections between leaf-level NOx exchanges and emission of biogenic volatile organic carbon; (5) re-examine nocturnal and daytime below-canopy turbulent transport representation in the Multi-layer Canopy Chemical Exchange (MLC-CHEM) model using high resolution temperature gradient measurements; and (6) incorporate, revisit, and further improve the modeling of the UMBS forest oxidation.

这个项目是夏季实地研究的一部分，目的是更好地了解森林环境中大气中的反应化学。在这个项目中，将研究叶一级的氮化合物交换，以更好地预测臭氧、二次有机气溶胶的产生以及大气和生物圈之间的氮循环。提高对森林环境中的反应化学的了解，将改善对未来森林演替和气候变化可能如何影响未来大气组成的预测。这项研究的具体目标是：(1)确定密歇根大学生物站(UMBS)氧化剂研究计划(PROPHET)站点主要树种的NO、NO2、NOY和臭氧的叶交换；(2)确定叶水平气体交换对包括光合作用、气孔导度、光、温度和湿度在内的生理和环境因子的依赖；(3)确定叶水平气体交换对环境NOx和臭氧混合比的依赖；(4)研究叶水平NOx交换与生物源挥发性有机碳排放之间的潜在联系；(5)利用高分辨率温度梯度测量，重新检验多层冠层化学交换(MLC-CHEM)模式中夜间和白天冠层下湍流输送的表现；(6)纳入、重访和进一步改进UMBS森林氧化的模拟。