| DOI: | 10.2172/1043056
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| 报告号: | DOE/ER/63984
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| 报告题名: | Laboratory Studies of Processing of Carbonaceous Aerosols by Atmospheric Oxidants/Hygroscopicity and CCN Activity of Secondary & Processed Primary Organic Aerosols |
| 作者: | Ziemann, P.J.; Arey, J.; Atkinson, R.; Kreidenweis, S.M.; Petters, M.D.
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| 出版年: | 2012
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| 发表日期: | 2012-06-13
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | aerosols
; particles
; particulates
; organic matter
; atmospheric chemistry
; atmospheric modeling
; clouds
; cloud nuclei
; hygroscopicity
; climate change
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| 中文主题词: | 大气科学
; 有机物
; 气溶胶
; 碳质气溶胶
; 有机微粒
; 空气质量
; 排放物
; 颗粒物
; 挥发性有机化合物
; 大气化学
; 散射
; 冷凝
; 云
; 硝酸盐
; 凝结
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| 主题词: | ATMOSPHERE
; ORGANIC MATTER
; AEROSOLS
; CARBONACEOUS AEROSOLS
; ORGANIC PARTICLES
; AIR QUALITY
; EMISSIONS
; PARTICULATES
; VOLATILE ORGANIC COMPOUNDS
; ATMOSPHERIC CHEMISTRY
; SCATTERING
; CONDENSATION
; CLOUDS
; NITRATE
|
| 英文摘要: | The atmosphere is composed of a complex mixture of gases and suspended microscopic aerosol particles. The ability of these particles to take up water (hygroscopicity) and to act as nuclei for cloud droplet formation significantly impacts aerosol light scattering and absorption, and cloud formation, thereby influencing air quality, visibility, and climate in important ways. A substantial, yet poorly characterized component of the atmospheric aerosol is organic matter. Its major sources are direct emissions from combustion processes, which are referred to as primary organic aerosol (POA), or in situ processes in which volatile organic compounds (VOCs) are oxidized in the atmosphere to low volatility reaction products that subsequent condense to form particles that are referred to as secondary organic aerosol (SOA). POA and VOCs are emitted to the atmosphere from both anthropogenic and natural (biogenic) sources. The overall goal of this experimental research project was to conduct laboratory studies under simulated atmospheric conditions to investigate the effects of the chemical composition of organic aerosol particles on their hygroscopicity and cloud condensation nucleation (CCN) activity, in order to develop quantitative relationships that could be used to more accurately incorporate aerosol-cloud interactions into regional and global atmospheric models. More specifically, the project aimed to determine the products, mechanisms, and rates of chemical reactions involved in the processing of organic aerosol particles by atmospheric oxidants and to investigate the relationships between the chemical composition of organic particles (as represented by molecule sizes and the specific functional groups that are present) and the hygroscopicity and CCN activity of oxidized POA and SOA formed from the oxidation of the major classes of anthropogenic and biogenic VOCs that are emitted to the atmosphere, as well as model hydrocarbons. The general approach for this project was to carry out reactions of representative anthropogenic and biogenic VOCs and organic particles with ozone (O3), and hydroxyl (OH), nitrate (NO3), and chlorine (Cl) radicals, which are the major atmospheric oxidants, under simulated atmospheric conditions in large-volume environmental chambers. A combination of on-line and off-line analytical techniques were used to monitor the chemical and physical properties of the particles including their hygroscopicity and CCN activity. The results of the studies were used to (1) improve scientific understanding of the relationships between the chemical composition of organic particles and their hygroscopicity and CCN activity, (2) develop an improved molecular level theoretical framework for describing these relationships, and (3) establish a large database that is being used to develop parameterizations relating organic aerosol chemical properties and SOA sources to particle hygroscopicity and CCN activity for use in regional and global atmospheric air quality and climate models. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1043056
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/40631
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| 1043056.pdf（204KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Ziemann, P.J.,Arey, J.,Atkinson, R.,et al. Laboratory Studies of Processing of Carbonaceous Aerosols by Atmospheric Oxidants/Hygroscopicity and CCN Activity of Secondary & Processed Primary Organic Aerosols. 2012-01-01.
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