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| Organic aerosol formation in the humid, photochemically-active Southeastern US: SOAS experiments and simulations | |
| 项目编号 | R835412 |
| Barbara Turpin | |
| 项目主持机构 | Duke University,Georgia Institute of Technology - Main Campus,Georgia Environmental Protection Division,NASA Goddard Institute for Space Studies (GISS),NESCAUM |
| 开始日期 | 2013-04-01 |
| 结束日期 | 2015-03-01 |
| 英文摘要 | The overall goal of the proposed project is to experimentally determine the extent to which NO3 radicals (formed from anthropogenic NO2 and ozone) affect organic aerosol (OA) loading and composition over its atmospheric lifetime, taking into account secondary organic aerosol (SOA) formation from NO3 oxidation pathway and both daytime and nighttime aging processes. The interactions of biogenic volatile organic compounds (VOCs) with NO3 radicals represent a direct way for positively linking anthropogenic and biogenic emissions. The first specific objective is to experimentally characterize SOA formation and gas- and particle-phase composition from the reaction of biogenic VOCs with NO3 radicals. It is hypothesized that SOA formation is dependent on the fate of peroxy radical, relative humidity, and particle acidity. The second specific objective is to determine the changes in SOA loadings and key properties with multigenerational aging, including both photochemical (OH) and dark (NO3) aging.A series of experiments will be performed in the Georgia Tech Indoor Chamber Facility. The changes in gas and aerosol composition, aerosol chemical and physical properties will be continuously monitored by a suite of analytical instruments surrounding the chamber facility. This allows for linking gas-phase chemistry to SOA formation. Experiments will be performed to study SOA formation from the nitrate oxidation of biogenic VOCs with different RH and seed acidity conditions. A series of aging experiments will also be performed to examine the mutigenerational SOA chemistry by characterizing the chemical composition of OA over its diurnal life cycle.This study will provide an extensive data set on SOA formation from nitrate oxidation pathway and the multigenerational chemistry involving both photochemical and dark aging. Yield parameters (e.g., Odum 2 product model, 2D volatility basis set) can be directly obtained from this study and be used in models. The inclusion of results from this study will improve our ability to simulate SOA formation in models, especially in constraining the nighttime chemistry as well as the diurnal variations of organic carbon. An improved SOA model will help inform policy makers on regulations on air quality. |
| 英文关键词 | partitioning;semivolatiles;multifunctional oxidation products |
| 学科分类 | 0805 - 大气科学;08 - 地球科学 |
| 资助机构 | US-EPA |
| 项目经费 | 399928 |
| 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/75044 |
| 推荐引用方式 GB/T 7714 | Barbara Turpin.Organic aerosol formation in the humid, photochemically-active Southeastern US: SOAS experiments and simulations.2013. |
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