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的倍半萜烯排放量。倍半萜是生物挥发性有机化合物（BVOCs），具有化学活性和低挥发性。它们的氧化产物被认为是二次有机气溶胶（SOAs）的重要组成部分，特别是在森林地区。将对特定和总倍半萜排放因子进行系统调查。植被调查采用环境控制圈闭实验（叶片试管和树枝圈闭）。发射样品将在无机固体吸附剂上收集，倍半萜将通过热解吸/质谱气相色谱和火焰电离检测在现场进行鉴定和定量。该项目的更广泛影响将包括国家大气研究中心和科罗拉多大学博尔德分校高山和北极研究所的研究小组之间的密切合作，建造现场鉴定和量化倍半萜通量的现场仪器，支持研究生和本科生，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.