RAPID: TAG-AMS Measurements of Organic Aerosol during the BEACHON-RoMBAS 2011 Field Campaign

RAPID：BEACHON-RoMBAS 2011 现场活动期间有机气溶胶的 TAG-AMS 测量

• 批准号: 1135745
• 负责人: Allen Goldstein
• 金额: $ 16.24万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-01 至 2013-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1135745&HistoricalAwards=false
• 关键词: RAPID; TAG; AMS; Measurements; Organic

The objective of this project is to investigate the sources, processing, and feedbacks of secondary organic aerosols (SOAs) that are produced from volatile organic precursors emitted from the Manitou Forest in Colorado during summer 2011. The principal investigator (PI) has developed a novel thermal desorption aerosol gas chromatograph (TAG) coupled to an aerosol mass spectrometer (AMS) that characterizes the organic composition of ambient aerosols. This project supports deployment of TAG-AMS as part of the BEACHON-RoMBAS (Bio-hydro-atmosphere interactions of Energy, Aerosols, Carbon, H2O, Organics, and Nitrogen - Rocky Mountain Biogenic Aerosol Study) intensive field campaign and the interpretation of resulting data. The TAG speciates the organic composition of ambient aerosols hourly while the AMS measures mass spectra of the corresponding total particulate organic matter. Relative to other approaches, the simultaneous quantification of organic speciation and mass loading using the same ion source and high-resolution time-of-flight mass spectrometer provides enhanced resolution in characterizing the associated sources and chemical processing of particulate organic matter in the atmosphere. The prototype TAG-AMS instrument was deployed and operated successfully in Pasadena, CA as part of the CalNex (Nexus of Air Quality and Climate Change) campaign during May and June 2010. Measurements with the TAG-AMS during BEACHON-RoMBAS will contribute to the overall programmatic goal of understanding sources, processing, and feedbacks of secondary biogenic aerosols. Results will also be interpreted in conjunction with prior TAG and AMS measurements in the Blodgett Forest in California during BEARPEX (Biosphere Effects on Aerosols and Photochemistry Experiment). Both the Manitou and Blodgett forests are dominated by ponderosa pine but differ significantly in relative amounts of anthropogenic air pollutants and emission fluxes of biogenic volatile organic carbon (VOC). The combined data sets from these two sites will yield insight regarding production pathways for SOA from biogenic precursors over a broad range in chemical regimes. In addition, experience gained through this field deployment will allow the PI to further evaluate performance of the new TAG-AMS system. Results from this project will substantially improve our understanding of and ability to predict the chemical processing of biogenic gases to form particulate organic matter in the atmosphere, influences of this particulate material on clouds and precipitation fields, and resulting feedbacks on forests. This project will foster new collaborations involving the PI and other participants in the BEACHON-RoMBAS field campaign. Data interpretation will lever additional insight from measurements during the BEARPEX campaign. A postdoctoral researcher will be trained through the project and results will be integrated into classroom instruction by the PI. Knowledge gained by the PI, collaborating scientists, and students will be broadly disseminated through scholarly publications and will thereby contribute substantively to both the atmospheric chemistry and air quality communities.

本项目的目的是调查二次有机气溶胶（SOA）的来源，加工和反馈，产生的挥发性有机前体排放的马尼图在科罗拉多森林在2011年夏季。主要研究者（PI）开发了一种新型的热解吸气溶胶气相色谱仪（TAG）耦合到气溶胶质谱仪（AMS），表征环境气溶胶的有机成分。该项目支持部署TAG-AMS作为BEACHON-RoMBAS（能量、气溶胶、碳、H2O、有机物和氮的生物-水-大气相互作用-落基山生物气溶胶研究）密集实地活动的一部分，并解释所得数据。气溶胶分析仪每小时分析环境气溶胶的有机成分，而AMS则测量相应的总颗粒有机物的质谱。相对于其他方法，使用相同的离子源和高分辨率飞行时间质谱仪同时定量有机形态和质量负荷，可以提高表征大气中颗粒有机物相关来源和化学加工的分辨率。TAG-AMS仪器原型于2010年5月和6月在加利福尼亚州帕萨迪纳成功部署和运行，作为CalNex（空气质量和气候变化的联系）活动的一部分。 在BEACHON-RoMBAS期间使用TAG-AMS进行的测量将有助于实现了解二次生物气溶胶的来源、处理和反馈的总体方案目标。结果还将结合先前在加州Blodgett森林进行的气溶胶生物圈效应和光化学实验（BEARPEX）期间的TAG和AMS测量结果进行解释。无论是马尼图和Blodgett森林占主导地位的黄松，但不同的人为空气污染物的相对量和生物源挥发性有机碳（VOC）的排放通量显着。从这两个网站的组合数据集将产生关于SOA的生产途径，从生物前体在广泛的化学制度的见解。此外，通过现场部署获得的经验将使PI能够进一步评估新的TAG-AMS系统的性能。 该项目的结果将大大提高我们的理解和能力，以预测生物气体的化学处理在大气中形成颗粒有机物，这种颗粒物质对云和降水场的影响，以及对森林的反馈。该项目将促进PI和BEACHON-RoMBAS实地活动其他参与者的新合作。数据解释将从BEARPEX活动期间的测量中获得更多见解。一名博士后研究员将通过该项目接受培训，其结果将被PI纳入课堂教学。PI，合作科学家和学生获得的知识将通过学术出版物广泛传播，从而为大气化学和空气质量社区做出实质性贡献。