Reactivity of Biogenic Volatile Organic Compound Emissions and Their Attribution to Identified Chemical Species

该项目将调查最近一些关于森林大气中生物挥发性有机化合物(BVOC)排放的研究中报告的缺失反应性。它的核心是应用一种新的方法来直接确定来自植被的BVOC排放的臭氧反应性。从含有植物的围栏中吸入的空气将与富含臭氧的空气混合，然后通过流动管，在流管中将使用差动臭氧监测器直接测量臭氧损失。臭氧反应性将在国家大气研究中心(NCAR)温室、科罗拉多州博尔德的当地苗圃、密歇根大学生物站(UMBS)以及能源、气溶胶、碳、水、有机物和氮的生物-水-大气相互作用(BEACHEON)马尼图森林研究地点的一系列植被类型的BVOC排放中确定。这些植被类型包括美国森林中的优势物种。并行进行的臭氧和OH反应性实验将揭示这些氧化剂的缺失反应性如何随物种、环境条件以及彼此之间的相对而变化，从而提供有关未知化合物的身份的洞察。在实验室动力学实验的基础上，将评估BVOC O_3速率常数用于估算相应的臭氧去除速率的适用性。该项目的结果将有助于改进森林大气中自由基化学的光化学模型。该项目还将支持CU的毛细管扩散系统继续运行，以产生倍半萜标准品，供PIs小组和社区其他研究小组使用。这种新的测量方法的开发和评估在重新评估过去实验的结果和规划和表征未来活动中的BVOC反应性方面具有潜在的广泛应用。该项目将为本科生和博士后研究人员的教育做出贡献。来自少数族裔的学生将从Sauars和SMART计划中招募，以帮助完成暑期实地考察工作。更广泛的公众将受益于在INSTAAR的年度开放日上向8年级学生展示这项工作，通过在2012年Boulder Creek音乐节上计划的摊位，通过专门的门户网站，以及通过与丹佛市“英里高百万”计划的互动。更好地了解BVOC化学将导致更有效的空气污染缓解策略，从而改善空气质量和健康。

This project will investigate the missing reactivity that has been reported in a number of recent studies of biogenic volatile organic compound (BVOC) emissions in the forest atmosphere. It centers on the application of a new approach for the direct determination of the ozone reactivity of BVOC emissions from vegetation. Air drawn from enclosures containing vegetation will be mixed with ozone-enriched air and then passed through a flow tube where the loss of ozone will be measured directly with a differential ozone monitor. Ozone reactivity will be determined for BVOC emissions from a range of vegetation types in the National Center for Atmospheric Research (NCAR) greenhouse, at a local tree nursery in Boulder, CO, at the University of Michigan Biological Station (UMBS), and at the Bio-hydro-atmosphere interactions of Energy, Aerosols, Carbon, H2O, Organics & Nitrogen (BEACHEON) Manitou Forest research site. These vegetation types include the dominant species in U.S. forests. Ozone and OH reactivity experiments conducted in parallel will shed light on how the missing reactivity of these oxidants varies with species, with environmental condition, and relative to each other, thereby providing insight regarding the identities of unknown compounds. The applicability of BVOC + O3 rate constants for estimating the corresponding rates of ozone removal will be evaluated based on kinetic laboratory experiments. Results of the project will help improve photochemical models of radical chemistry in the forest atmosphere. The project will also support continued operation of CU's capillary diffusions system for generating sesquiterpene standards that are used by the PIs' groups as well as other research groups in the community. The development and evaluation of this new measurement approach has potentially wide-ranging applications for both reevaluating results from past experiments and planning and characterizing BVOC reactivity during future campaigns. This project will contribute to the education of undergraduate students and a postdoctoral researcher. Students from minorities will be recruited from the SOARS and SMART programs to help with the summer field work. The broader public will benefit from presentation of this work to 8th graders at INSTAAR's Annual Open House, through a booth planned at the 2012 Boulder Creek Festival, through a dedicated web portal, and through interactions with the City of Denver "The Mile High Million" program. A better understanding of BVOC chemistry will lead to more effective air pollution mitigation strategies resulting in improved air quality and health.