Chemical Coupling of Halogens and Oxygenated VOC (Volatile Organic Compounds): Observations, Experiments and Modeling

卤素和含氧 VOC（挥发性有机化合物）的化学偶联：观察、实验和建模

• 批准号: 1620530
• 负责人: Rainer Volkamer
• 金额: $ 70.33万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-15 至 2022-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1620530&HistoricalAwards=false
• 关键词: Chemical; Coupling; Halogens; Oxygenated; VOC

This project includes field observations, laboratory experiments, and modeling tasks designed to investigate the chemistry associated with halogens, such as bromine and iodine, in the atmosphere. Measurements will be made at two mountain top observatories (Maido in the Southern Hemisphere tropical Indian Ocean and Mauna Loa in the Northern Hemisphere tropical Pacific Ocean) to assess the seasonal variability of halogen concentrations. This research will provide critical new information for assessing the extent to which tropospheric halogens modify the lifetime of tropospheric ozone, a potent greenhouse gas, and serve as a precursor for the formation of hydroxyl radicals, that influence the lifetime of atmospheric methane. Thus the results will be directly relevant for modeling future climate change.Laboratory experiments will be conducted to investigate the reaction mechanism of bromine radicals with unsaturated oxygenated volatile organic compounds (OVOC) that can form from aliphatic acids in marine air and the potential for product yields of glyoxal and aliphatic aldehydes. Modeling efforts will compare field measurements with the results of global models to assess the impacts of the BrOx sink from OVOC for halogen impacts on tropospheric ozone, methane, and atmospheric mercury.

该项目包括现场观察，实验室实验和建模任务，旨在研究与卤素（例如溴和碘）在大气中相关的化学反应。 将在两个山顶观测站（南半球热带印度洋的Maido和北半球热带太平洋的Mauna Loa）进行测量，以评估卤素浓度的季节性变异性。这项研究将提供关键的新信息，以评估对流层卤素改变对流层臭氧的寿命，这是一种有效的温室气体，并作为形成羟基自由基的前体，从而影响大气甲烷的寿命。因此，结果将与未来的气候变化建模直接相关。将进行实验室实验，以研究可与不饱和的含氧挥发性有机化合物（OVOC）的反应机理，这些有机化合物（OVOC）可以从海洋空气中的脂肪酸中形成，并为脂肪氧和脂肪含量的产物产生潜在的产物。 建模工作将将现场测量结果与全球模型的结果进行比较，以评估OVOC对卤素影响对流层臭氧，甲烷和大气汞的影响。