Climate Change Data Portal
| Sensitivity of Organic Aerosol Concentrations | |
| 项目编号 | RD-83540501-0 |
| James Davies | |
| 项目主持机构 | Carnegie Mellon University |
| 开始日期 | 2013-04-01 |
| 结束日期 | 2016-03-31 |
| 英文摘要 | In this proposal, field measurements are designed to understand how secondary organic aerosol (SOA) forms in mixtures of biogenic and anthropogenic emissions and laboratory studies are proposed to evaluate its impacts on climate. The proposed study focuses on organosulfates that are significant components of ambient aerosol and unique to SOA formed under acidic conditions. Field-based measurements of organosulfates will be used to test the hypothesis that anthropogenic sulfur dioxide emissions impact SOA formation. Laboratory studies will further test the hypothesis that organosulfates are climate forcing agents. The primary objectives of the proposed work are to: i. Identify the anthropogenic and biogenic emission sources and atmospheric conditions that lead to organosulfate and SOA formation ii. Evaluate the direct and indirect radiative properties of organosulfates, including their light absorption, hygroscopicity, and cloud condensation nuclei activity. The proposed study will improve the understanding of SOA formation, advance the analytical tools to study particulate matter, provide the first measurements of the climatically-relevant properties of organosulfates, and make significant contributions to the upcoming Southern Oxidant & Aerosol Study (SOAS).To allow for organosulfate quantification in ambient aerosol, a novel set of biogenic organosulfate molecules will be generated using targeted organic synthesis. With these standards, a new analytical method will be developed using liquid chromatography and tandem mass spectrometry for the separation, identification, and quantification of organosulfates. Validated methodology will be applied to fine particulate matter collected in the Southeastern United States during the SOAS field campaign. Complementary chemical analysis will include measurements of organic carbon, sulfate and other inorganic ions, organic molecular markers for primary aerosol sources, and SOA tracers. Receptor-based source apportionment techniques will be applied to evaluate the sources of organic aerosol, SOA, and organosulfates. The direct and indirect radiative forcing properties of organosulfates will be evaluated with physical measurements of ultraviolet and visible light absorption, hygroscopicity, and cloud condensation nuclei activity.It is expected that these studies will provide mechanistic insight to how SOA forms under acidic conditions and how it impacts direct and indirect radiative forcing. Understanding the chemical and physical properties of SOA will lead to future advancements in the predictive capabilities of air quality and climate models. |
| 英文关键词 | mbient air;atmosphere;tropospheric;particulates;sulfates;organics;environmental chemistry;analytical;monitoring;modeling;measurement methods;southeast;EPA Region 4 |
| 资助机构 | US-EPA |
| 项目经费 | 399998 |
| 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/75040 |
| 推荐引用方式 GB/T 7714 | James Davies.Sensitivity of Organic Aerosol Concentrations.2013. |
| 条目包含的文件 | 条目无相关文件。 | |||||
| 个性服务 |
| 推荐该条目 |
| 保存到收藏夹 |
| 导出为Endnote文件 |
| 谷歌学术 |
| 谷歌学术中相似的文章 |
| [James Davies]的文章 |
| 百度学术 |
| 百度学术中相似的文章 |
| [James Davies]的文章 |
| 必应学术 |
| 必应学术中相似的文章 |
| [James Davies]的文章 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
