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

生物挥发性有机化合物排放的反应性及其对已识别化学物质的归属

• 批准号: 1140571
• 负责人: Detlev Helmig
• 金额: $ 58.02万
• 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: 2012
• 资助国家: 美国
• 起止时间: 2012-02-15 至 2017-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1140571&HistoricalAwards=false
• 关键词: Reactivity; Biogenic; Volatile; Organic; Compound

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.

该项目将调查在森林大气中对生物挥发性有机化合物（BVOC）排放的许多最新研究中报道的缺失反应性。 它集中在采用新方法直接确定植被中BVOC排放的臭氧反应性的情况下。从含有植被的外壳的空气中抽出的空气将与含臭氧的空气混合，然后穿过流管，在该管道中，将直接用差异臭氧监测器直接测量臭氧的损失。将在国家大气研究中心（NCAR）温室中的一系列植被类型的BVOC排放量确定臭氧反应性，在密歇根大学生物站（UMBS）的一家当地树木托儿所（UMBS）和能源，气溶胶，碳，H2O，有机物和氮（Beacheon）Manitou Forest Research网站的能量，气溶胶，碳，H2O，有机物和氮的生物 - 氢 - 大气相互作用。 这些植被类型包括美国森林中的主要物种。 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，环境状况而变化，并相对于彼此而变化，从而提供了有关未知化合物身份的见解。 BVOC + O3速率常数用于估计臭氧去除率的相应速率的适用性将根据动力学实验室实验进行评估。 该项目的结果将有助于改善森林气氛中自由基化学的光化学模型。 该项目还将支持CU的毛细血管扩散系统的持续操作，以生成PIS组以及社区中其他研究小组使用的倍半萜标准。这种新测量方法的开发和评估具有潜在的广泛应用程序，用于重新评估过去的实验结果以及计划和表征BVOC反应性的结果。 该项目将有助于本科生和博士后研究员的教育。 来自少数民族的学生将从飙升和聪明的计划中招募，以帮助夏季野外工作。 更广泛的公众将通过在2012年Boulder Creek Festival举行的一个展位，通过专用的网站来向Instaar年度开放日的八年级学生展示这项工作，并通过与丹佛市“ Mile Highnion Mirnion Million Million”的互动。程序。 更好地了解BVOC化学将导致更有效的空气污染策略，从而改善空气质量和健康。