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

一种新开发的质子转移离子阱质谱仪（PIT-MS）将用于测量和在线鉴定受城市、生物源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）。具体来说，它的目的是：1；在即将进行的两个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大城市倡议：地方和全球研究观测（MILAGRO）研究和2006年晚些时候在德克萨斯州进行的空气质量研究（TexAQS） 6.2。确定在黄松/橡树林场（加利福尼亚州Blodgett forest）观测到的“缺失”的生物源性VOCs，这些VOCs是根据OH寿命和臭氧吸收测量得出的假设。这项工作将包括VOC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、甲基丁烯醇及其三种初级氧化产物的首次同时测量将在现场进行。为了探索PIT-MS仪器测量生物质燃烧排放的挥发性有机化合物的分析能力，在密苏里州米苏拉的火灾科学实验室，这些活动产生的更广泛的影响包括对大气中挥发性有机化合物的来源和化学成分的详细了解。臭氧和二次有机气溶胶（SOA）是VOC去除的副产品，两者都是城市空气中的主要污染物，对人体健康有不利影响。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。了解挥发性有机化合物的大气化学可能有助于设计空气管理策略，以尽量减少污染空气中臭氧和SOA的积累。该项目将在本科和研究生阶段为下一代大气科学家提供培训。此外，MILAGRO组成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.