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| Aerosol Optical Properties and Biogenic SOA | |
| 项目编号 | RD-83541101-0 |
| Joselynn Fountain | |
| 项目主持机构 | Research Triangle Institute |
| 开始日期 | 2013-04-01 |
| 结束日期 | 2016-03-31 |
| 英文摘要 | The underlying hypothesis of this study is that anthropogenic emissions enhance isoprene SOA formation through the heterogeneous chemistry of isoprene-derived epoxides, possibly leading to light-absorbing SOA in the southeastern U.S. The specific objectives to evaluate this hypothesis include: (1) Leveraging our ongoing Look Rock, TN, field site during the community-led Southern Oxidant & Aerosol Study (SOAS) in summer 2013 to evaluate how isoprene SOA formation chemistry varies between regional and urban influenced air masses; (2) Evaluate the effects of relative humidity, aerosol acidity, and seed aerosol type on the heterogeneous chemistry of isoprene-derived epoxides leading to SOA and how this might yield light-absorbing aerosol constituents (i.e., brown carbon); (3) Evaluate gaseous yields of epoxides from isoprene oxidation under varying initial levels of nitric oxide.We will directly couple our capability in synthetic organic chemistry with our involvement in the SOAS field campaign and our pre- and post-campaign UNC smog chamber studies. We have established synthetic routes for the isoprene-derived epoxides and their selected SOA products. These key chemicals will be provided for advanced mass spectrometry techniques, such as a chemical ionization high-resolution time-of-flight mass spectrometry (CIHR- TOFMS) and an aerosol chemical speciation monitor (ACSM), that will be utilized to quantitatively measure in real-time the gas- and aerosol-phase constituents related to isoprene oxidation. Furthermore, we will chemically characterize PM2.5 samples collected onto filters during the SOAS campaign and from our smog chamber studies for known isoprene SOA tracers using gas chromatography/mass spectrometry (GC/MS) and ultra performance liquid chromatography/electrospray ionization high-resolution mass spectrometry (UPLC/ESI-HRMS). UPLC-diode array detection (DAD) will also be used to detect and characterize brown carbon (or light-absorbing) aerosol constituents.The proposed activities will yield the formulation of parameterizations thatcan be incorporated into SOA models that will lead to improvement in the ability to simulateisoprene SOA formation in the southeastern U. S. Specific results include: (1) characterizationof reaction pathways that control the oxidation of isoprene in the southeastern U. S. andquantitative assessment of the impact of anthropogenic emissions on these pathways; (2)discover the links between isoprene oxidation, anthropogenic influences, and formation ofisoprene-derived SOA; (3) determine the importance of RH, aerosol water content, pre-existingPM, and aerosol acidity on isoprene SOA formation enhanced by anthropogenic emissions; and(4) characterization of isoprene-derived SOA constituents leading to light-absorbing browncarbon. These results will provide improvements that are essential so that air quality models canbe used with increased confidence in predicting organic PM2.5. |
| 英文关键词 | atmosphere;particulates;environmental chemistry;biogenic volatile organic compounds;terpenes |
| 资助机构 | US-EPA |
| 项目经费 | 398318 |
| 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/75038 |
| 推荐引用方式 GB/T 7714 | Joselynn Fountain.Aerosol Optical Properties and Biogenic SOA.2013. |
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