Modelling atmospheric effects of electrical discharges

模拟放电的大气效应

• 批准号: 496872622
• 负责人: Professor Dr. Justus Notholt
• 金额: --
• 依托单位: Abteilung für Erdfernerkundung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2022
• 资助国家: 德国
• 起止时间: 2021-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/496872622?language=en
• 关键词: Modelling; atmospheric; effects; electrical; discharges

Lightning is known to be an important source of nitrogen radicals in the troposphere, and this is taken into account in many atmospheric chemistry and climate chemistry models. Recent measurements have shown that there is also significant production of hydrogen radicals (HOx) in electrified clouds. This production has been attributed to weak subvisible electrical discharges. Both the formation mechanism of HOx in electrified clouds as well as the atmospheric impacts are hardly investigated. The aim of this project is to study the impacts of weak electrical discharges on reactive hydrogen species and other trace gases in the Earth's atmosphere. For this purpose, a plasma chemistry model will be used. Model simulations will be carried out for a comparison with laboratory measurements, and for an analysis of the impact of hydrometeor discharges in electrified clouds. Additionally, the model will be used to investigate the chemical effects of weak electrical discharges at higher altitudes, as there are significant discrepancy between measured and modelled HOx enhancements over active thunderstorms. Furthermore, an atmospheric chemistry and transport model will be used to study the global impact of HOx production in electrified clouds.

闪电是对流层氮自由基的重要来源，许多大气化学和气候化学模型都考虑到了这一点。最近的测量表明，在带电云中也有大量的氢自由基（HOx）产生。这种产生归因于微弱的亚可见放电。带电云中HOx的形成机制以及带电云对大气的影响目前还很少有人研究。该项目的目的是研究弱放电对地球大气中活性氢物质和其他痕量气体的影响。为此，将使用等离子体化学模型。将进行模型模拟，以便与实验室测量结果进行比较，并分析带电云中水凝物放电的影响。此外，该模型将用于研究在较高海拔地区弱放电的化学效应，因为在活跃雷暴中测量和模拟的HOx增强之间存在显着差异。此外，还将使用一个大气化学和传输模式来研究带电云层中HOx产生的全球影响。