Tropospheric Chemistry of Isoprene and Monoterpenes

在区域和全球尺度上，主要由异戊二烯和单萜烯组成的植被的非甲烷有机化合物的排放量与人为来源的非甲烷有机化合物的排放量相当或超过。在这个为期三年的实验项目中，pi将使用大气压电离串联质谱法与傅里叶变换红外吸收光谱法、气相色谱法和气相色谱-质谱联用法进行鉴定和量化，异戊二烯和一系列单萜烯在对流层条件下与OH、NO3自由基和O3气相反应形成的产物。从该研究项目中获得的产物和机理数据将为制定这些生物源化合物在对流层降解的反应方案提供必要的信息。形成的某些产物可以作为植被释放的有机化合物向大气转化的“标记”化合物。因此，pi还将在精心选择的地点进行选定的环境空气研究，以调查这些大气转化产物是否存在于环境大气中。

On regional and global scales, the emissions of non-methane organic compounds from vegetation, mainly comprised of isoprene and monoterpenes, are comparable to or exceed the emissions of non-methane organic compounds from anthropogenic sources. During this three-year experimental program, the PIs will identify and quantify, using atmospheric pressure ionization tandem mass spectrometry in conjunction with Fourier transform infrared absorption spectroscopy, gas chromatography and combined gas chromatography-mass spectrometry, the products formed under tropospheric conditions from the gas-phase reactions of isoprene and a series of monoterpenes with OH and NO3 radicals and O3. The product and mechanistic data obtained from this research program will provide the information necessary for the formulation of reaction schemes for the tropospheric degradations of these compounds of biogenic origin. Certain of the product species formed may serve as "marker" compounds for the atmospheric transformations of organic compounds emitted by vegetation. Accordingly, the PIs will also conduct selected ambient air studies in carefully chosen locations to investigate whether or not these atmospheric transformation products are present in the ambient atmosphere.