Collaborative Research: Sulfur Oxide Chemistry in Aqueous Aerosols--Mechanisms and Kinetics of Inorganic Sulfate and Organosulfur Compound Formation in the Atmosphere

合作研究：水气溶胶中的硫氧化物化学--大气中无机硫酸盐和有机硫化合物形成的机理和动力学

• 批准号: 2302301
• 负责人: Vicki Grassian
• 金额: $ 59.61万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-06-01 至 2026-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2302301&HistoricalAwards=false
• 关键词: Collaborative; Research; Sulfur; Oxide; Chemistry

In this collaborative project, the research team will conduct laboratory experiments and box model simulations to study sulfur compound formation within aerosols. There currently exist gaps in the chemical representation of sulfate aerosol formation in models, especially during haze episodes, due to a lack of experimental data over a range of environmental conditions. This research team seeks to fill this gap. The knowledge gained could be used in large-scale atmospheric chemistry models, which has the potential to positively impact air quality management and climate change research communities. Additionally, three graduate students will be trained during this project, and bilingual (English and Spanish) outreach kits and videos will be developed and shared with non-technical audiences via new and ongoing outreach activities.The research, which represents a change to the conceptualization of sulfur dioxide atmospheric chemistry, aims to characterize the kinetics and chemical mechanisms for low- to high-oxidation state sulfur conversion pathways within multiphase and aqueous aerosols. The project includes three specific investigations: (1) the investigation of sulfate formation in aqueous aerosols via hydrogen peroxide, organic peroxides, and transition metal ion oxidation pathways under a range of pH and ionic strength conditions using an aerosol optical tweezer-based approach; (2) an investigation of the competition between sulfate and organosulfur formation via sulfate radical initiated formation pathways in aqueous aerosols under different pH, temperature, and ionic strength conditions; and (3) an investigation of sulfur dioxide chemistry within multiphase aqueous droplets that contain reactive metal-containing inclusions such as minerals and coal fly ash particles.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在这个合作项目中，研究团队将进行实验室实验和框模型模拟，以研究气溶胶中的硫化合物形成。目前，由于在一系列环境条件上缺乏实验数据，目前在模型中硫酸盐气溶胶形成的化学表示存在差距。该研究团队试图填补这一空白。获得的知识可用于大规模的大气化学模型，该模型有可能积极影响空气质量管理和气候变化研究社区。此外，将在该项目中对三名研究生进行培训，双语（英语和西班牙语）外展套件和视频将通过新的和正在进行的外展活动与非技术观众共享并与非技术观众共享。这项研究代表了硫化二氧化碳大气化学的概念化的变化，旨在将硫化含量的硫酸化和化学速度用于较低的化学机制，从而使较低的化学速度转化为替代化学途径。水溶胶水性。该项目包括三个具体研究：（1）通过基于气溶胶光学tweezer的方法，在一系列pH和离子强度条件下，通过过氧化氢，有机过氧化物和过渡金属离子氧化途径研究硫酸盐在水溶胶中的研究； （2）研究通过硫酸盐自由基在不同的pH，温度和离子强度条件下的硫酸盐自由基启动形成途径的竞争； （3）对含有含有反应金属的夹杂物（例如矿物质和煤炭灰分的含有反应性金属的夹杂物）的多相水滴中的二氧化碳化学研究进行了研究。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力和更广泛影响的评估来通过评估来支持的。