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.

众所周知，闪电是对流层中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了这一点。最近的测量表明，在带电的云层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。带电云团中HOX的形成机理及其对大气的影响很少被研究。该项目的目的是研究微弱放电对地球大气中活性氢物种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，以与实验室测量结果进行比较，并分析带电云团中水流星排放的影响。此外，该模式将被用来研究高海拔地区微弱电放电的化学效应，因为在活跃的雷暴上，测量的和模拟的HOX增强之间存在显著差异。此外，将使用大气化学和输送模式来研究带电云中HOX产生的全球影响。