Daytime atmospheric chemistry of key compounds provoked by nighttime atmospheric chemistry (DARK KNIGHT).

夜间大气化学引发的关键化合物的白天大气化学（黑暗骑士）。

• 批准号: 243845280
• 负责人: Professor Dr. Hartmut Herrmann
• 金额: --
• 依托单位: Leibniz-Institut für Troposphärenforschung e.V. (TROPOS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/243845280?language=en
• 关键词: Daytime; atmospheric; chemistry; key; compounds

Sources of biogenic and anthropogenic origin emit significant amounts of volatile organic compounds (VOCs, 1300 TgC per year) into the atmosphere. After release into the atmosphere, VOCs undergo oxidation with OH and NO3 radical and O3 under formation of semi-volatile compounds that partition into the particle phase leading to the formation of secondary organic mass. Although biogenic and anthropogenic SOA is of great importance for the atmosphere (910 and 9.7 Tg per year), gaps regarding the formation mechanisms and involved compounds still exist. This is partly caused by so-far unknown formation mechanism and also due to mechanisms that lead to a reduction of SOA (like evaporation processes) and missing data sets (NO3 radical reaction). Within the first project phase, a new SOA formation mechanism has been successfully identified for anthropogenic SOA compounds due to the interconnection of day- and night time chemistry. For the present proposal, the evaporation of SOA will be examined and characterized as the existing data set clearly shows that evaporation plays an important role for nocturnal alpha-pinene SOA. Main evaporation products and the underlying mechanisms will be characterized. A second aspect for the present proposal is the data set for NO3 radical reactions of biogenic and anthropogenic VOCs. Within the first project phase, gaps in available data as well as discrepancies in existing data sets were found. The identification of the reason for these discrepancies will be investigated and a data set for the NO3 radical reaction of the most important biogenic and anthropogenic VOCs will be generated.

生物源和人为源向大气中排放大量挥发性有机化合物（VOC，每年1300 TgC）。在释放到大气中之后，VOC在形成半挥发性化合物的情况下被OH和NO3自由基和O3氧化，所述半挥发性化合物分配到颗粒相中，导致形成二次有机物质。虽然生物和人为的SOA是非常重要的大气（910和9.7 Tg每年），关于形成机制和涉及的化合物的差距仍然存在。这部分是由迄今未知的形成机制造成的，也是由于导致SOA减少的机制（如蒸发过程）和缺失的数据集（NO3自由基反应）。在第一个项目阶段，一个新的SOA的形成机制已成功地确定人为SOA化合物由于白天和夜间的化学互连。对于目前的建议，SOA的蒸发将被检查和现有的数据集的特点清楚地表明，蒸发夜间α-蒎烯SOA起着重要的作用。主要的蒸发产品和基本机制的特点。本提案的第二个方面是生物和人为VOCs的NO3自由基反应的数据集。在项目的第一阶段，发现了现有数据中的差距以及现有数据集的差异，将调查这些差异的原因，并将生成最重要的生物和人为VOCs的NO3自由基反应数据集。