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.

该项目是暑期研究的一部分，旨在更好地了解森林环境大气中的反应性化学。在该项目中，将研究叶片水平的氮化合物的交换，以更好地预测臭氧，次生有机气溶胶的产生以及大气和生物圈之间氮的循环。提高对森林环境中反应性化学的理解将改善森林继任和气候​​变化如何影响大气的未来构成的预测。 这项研究的具体目的是：（1）确定密歇​​根大学生物站（UMB）的氧化剂研究计划（UMB）的主要树种NO，NO2，NOY和臭氧的叶片交换：光化学，发射和运输（先知）地点； （2）确定叶片级气体交换对生理和环境因素的依赖性，包括光合作用，气孔电导，光，温度和湿度； （3）确定叶片级气体交换对环境NOX和臭氧混合比的依赖性； （4）研究叶级NOx交换与生物挥发性有机碳的发射之间的潜在连接； （5）使用高分辨率温度梯度测量值，在多层冠层化学交换（MLC-CHEM）模型中重新检查夜间和白天的呈阳极湍流传输表示； （6）结合，重新审视并进一步改善UMB森林氧化的建模。