New Mass Spectrometer Technology for Analysis of Biogenic Volatile Organic Compounds (VOCs)

新开发的质子转移离子阱质谱仪（PIT-MS）将用于测量和在线识别受城市，生物或森林火灾排放影响的空气中的活性挥发性有机化合物（VOCs）。具体而言，它的目的是：1。在即将进行的两项实验中研究城市大气中含氧挥发性有机化合物的主要和次要来源：2006年初在墨西哥城进行的特大城市倡议：地方和全球研究观测（MILAGRO）研究和2006年晚些时候进行的德克萨斯州空气质量研究（TexAQS）。为了确定在美国黄松/橡树林现场（Blodgett Forest，CA）观察到的“缺失”生物源VOC，并根据OH寿命和臭氧吸收测量结果进行假设。这项工作将包括挥发性有机化合物光氧化的实验室测量，以模拟预期的现场数据。此外，异戊二烯，甲基丁烯醇，和他们的三个主要氧化产物的第一次同时测量将在现场进行。为了探索PIT-MS仪器的分析能力，以测量生物质燃烧排放的挥发性有机化合物，在火灾科学实验室在米苏拉，MT。这些活动产生的更广泛的影响包括详细了解大气中挥发性有机化合物的来源和化学。臭氧和二次有机气溶胶（SOA）是去除VOC过程中产生的副产物，是城市空气中的主要污染物，对人体健康有严重影响。此外，臭氧和SOA有可能通过改变地球的辐射收支和氧化能力来影响地球的气候。了解VOCs的大气化学可能有助于设计空气管理策略，以最大限度地减少污染空气中臭氧和SOA的积累。该项目将为下一代大气科学家提供本科和研究生培训。此外，MILAGRO部分将有助于促进与墨西哥同事的科学合作，并有助于传播大气科学和仪器方面的一些最新发展。

A newly developed proton-transfer ion-trap mass spectrometer (PIT-MS) will be used for measurement and on-line identification of reactive volatile organic compounds (VOCs) in air impacted by urban, biogenic, or forest fire emissions. Specifically, it is intended:1. To study the primary and secondary sources of oxygenated VOCs in urban atmospheres during two upcoming experiments: the Megacity Initiative: Local and Global Research Observations (MILAGRO) study in Mexico City in early 2006 and the Texas Air Quality Study (TexAQS) later in 2006.2. To identify the "missing" biogenic VOCs that have been observed at a ponderosa pine/oak forest field site (Blodgett Forest, CA), and that have been postulated from OH lifetime and ozone uptake measurements. This work will include laboratory measurements of VOC photo-oxidation to simulate expected field data. In addition, the first simultaneous measurements of isoprene, methylbutenol, and their three primary oxidation products will be made at the field site.3. To explore the analytical capabilities of the PIT-MS instrument to measure VOCs emitted from biomass burning, at the Fire Sciences Laboratory in Missoula, MT.Broader impacts resulting from these activities include a detailed understanding of the sources and chemistry of VOCs in the atmosphere. Ozone and secondary organic aerosol (SOA) are formed as byproducts of VOC removal, and both of these are major pollutants in urban air, with adverse effects on human health. In addition, ozone and SOA have the potential to affect Earth's climate by changing its radiation budget and oxidative capacity. Understanding the atmospheric chemistry of VOCs may help in designing air-management strategies to minimize the build-up of ozone and SOA in polluted air. The project will provide training for the next generation of atmospheric scientists at the undergraduate and graduate level. In addition, the MILAGRO component will help to promote scientific collaborations with colleagues in Mexico and help to disseminate some of the latest developments in atmospheric science and instrumentation.