Extending the Use of Proton-Transfer-Reaction Mass Spectrometer (PTR-MS) for New Measurements of Volatile Organic Compounds and Their Oxidation Products

将购买一台质子转移反应质谱仪(PTR-MS)，用于实时、现场测量挥发性有机化合物(VOC)的浓度和通量，特别是萜类化合物。这些化合物在森林地区的对流层光化学中起着重要的作用。将PTR-MS与涡流协方差法相结合进行的现场浓度和通量测量与使用气相色谱与松弛涡流积累相结合进行的测量进行比较。将尝试扩大生态系统规模的通量。PTR-MS还将用于现场测量萜烯的氧化产物。此外，PI将与加州理工大学John Seinfeld教授的研究小组合作，利用PTR-MS作为产品分析工具，对VOC氧化过程进行实验室研究。

A Proton-Transfer-Reaction Mass Spectrometer (PTR-MS) instrument will be purchased and used for real-time, in-situ measurements of concentrations and fluxes of volatile organic compounds (VOCs), in particular, terpenes. These compounds play an important role in the tropospheric photochemistry of forested regions. In situ concentrations and flux measurements carried out with the PTR-MS coupled to the eddy covariance method will be compared to measurements using gas chromatography coupled to relaxed eddy accumulation. Extension to ecosystem scale fluxes will be attempted. The PTR-MS will also be used for in situ measurements of oxidation products of terpenes. In addition, the PI will collaborate with the research group of Prof. John Seinfeld at Caltech on laboratory studies of VOC oxidation processes by using the PTR-MS as a product analysis tool.