Sesquiterpene Emissions from Natural, Urban and Agricultural Vegetation in the United States

该项目的目标是应用定量技术来测量树木和农业植物排放的倍半萜烯。 倍半萜是一种具有化学反应性和低挥发性的生物源挥发性有机化合物（BVOC）。 它们的氧化产物被认为是造成二次有机气溶胶（SOAs）的重要原因，特别是在森林地区。 将进行物种和总倍半萜排放因子的系统调查。 将通过环境控制围隔实验（叶比色皿和分支围隔）对植被进行调查。 将在无机固体吸附剂上收集排放物样品，并通过热解吸/气相色谱质谱和火焰离子化检测在现场确定和量化倍半萜烯。建造一个现场仪器，用于现场鉴定和量化倍半萜通量，支持一名研究生和一名本科生，以及各种外联活动。

The goal of this project is to apply quantitative techniques to measure emissions of sesquiterpenes from trees and agricultural plants. Sesquiterpenes are biogenic volatile organic compounds (BVOCs) that are chemically reactive and have low volatility. Their oxidation products are considered responsible for a significant fraction of the secondary organic aerosols (SOAs), especially over forested regions. A systematic investigation of speciated and total sesquiterpene emission factors will be conducted. Vegetation will be surveyed by environmentally controlled enclosure experiments (leaf cuvette and branch enclosure). Emission samples will be collected on inorganic solid adsorbents and sesquiterpenes will be identified and quantified in the field by thermal desorption/gas chromatography with mass spectrometry and flame ionization detection.The broader impacts of this project will include close collaboration between research groups at the National Center for Atmospheric Research and the Institute of Alpine and Arctic Research at the University of Colorado, Boulder, the construction of a field instrument for on-site identification and quantification of sesquiterpene fluxes, support for a graduate student and undergraduate students, and various outreach activities.