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| Novel Measurements of Organic Aerosol Composition | |
| 项目编号 | RD-83540201-0 |
| Alison Hanlon | |
| 项目主持机构 | Washington University |
| 开始日期 | 2013-04-01 |
| 结束日期 | 2016-03-31 |
| 英文摘要 | Coupling of anthropogenic and biogenic emissions and subsequent atmosphericaging processes are hypothesized to be the leading single contribution to global organic aerosol(OA) mass concentrations, and is also perhaps the least understood single contribution to OA.Improved understanding of this coupling is a high priority topic in the field of atmosphericchemistry in order to determine mitigation strategies for OA control, a pollutant that altersclimate and causes detrimental health effects. The primary objective of this proposed work is tobetter characterize the controlling factors in enhanced secondary organic aerosol (SOA)formation from combined anthropogenic and biogenic emission sources through innovativelaboratory and field studies using novel instrumentation.The proposed project consists of four key components: 1)Development of new instrumentation to obtain new insights on the inherent complex chemistryand composition of SOA formation and evolution, 2) Deployment to a large field study(Southern Oxidant & Aerosol Study), 3) Controlled laboratory studies using a customemissions/combustion chamber, a flow-tube Potential Aerosol Mass (PAM) reaction chamber,and a large suite of chemical and physical measurement systems, and 4) A second field study(East St. Louis) which incorporates key lessons from the initial field study and extensivelaboratory studies to perform in-field controlled oxidation experiments (utilizing the PAMreaction chamber) to test the sensitivity of ambient SOA formation and transformation toperturbations in oxidation intensity and precursor composition. Both proposed field studies havethe advantage of being in regions of mixed biogenic and anthropogenic emissions, and are atlocations with sufficient infrastructure and supporting measurements. The infrastructure forproposed laboratory measurements already exists in the PI's laboratory, so will require limitedsetup time and cost. The proposed instrument development is focused on two measurementmethods: 1)Volatility and Polarity Separator (VAPS) for in-situ, high time-resolution,volatility-and polarity-separated OA composition, and 2) a modified Hygroscopicity-TandemDifferential Mobility Analyzer (HTDMA) for measurement of particle hygroscopicity, particlevolatility, and size-dependent oxidation effects.Through the proposed study, novel measurements of compositional and hygroscopic changes during SOA formation and transformation under various mixtures of biogenic- anthropogenic sources will be obser\led: 1) under unperturbed conditions, allowing meteorology to deliver various emission mixtures (SOAS), 2) in a laboratory setting, with complete control over oxidant levels, emission types, specific particle coatings, etc., and 3) with ambient emissions of gases/particles, but having the option to perturb the oxidation level, or add specific biogenic or anthropogenic gases/particles to the photochemical reaction mixture (East St. Louis). This study design will lead to many new insights on the formation processes and atmospheric transformations of SOA produced from mixed biogenic-anthropogenic emissions, and the associated potential for climate interactions. |
| 英文关键词 | High Resolution Time-of-Flight Mass Spectrometry |
| 资助机构 | US-EPA |
| 项目经费 | 298747 |
| 国家 | US |
| 语种 | 英语 |
| 文献类型 | 项目 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/75036 |
| 推荐引用方式 GB/T 7714 | Alison Hanlon.Novel Measurements of Organic Aerosol Composition.2013. |
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