Aqueous-Phase Photochemical Oxidant Formation in Clouds, Fogand Rain

阳光通过光化学过程形成反应物质，从而驱动大气的化学反应。众所周知，大气中气体的几种光化学过程对烟雾和酸雨的形成至关重要。人们还不太了解光化学过程在大气中的天然水，即云、雾和雨中的作用和重要性。该项目的目的是表征，地理上和时间上，活性氧化剂的形成在这些大气水系统。该项目将监测对特定氧化剂选择性敏感的化学捕集器的氧化情况，以便识别和量化大气水中形成的氧化剂。研究结果将为大气水体中形成的光氧化剂提供数据基础。这个数据库将有助于建立大气氧化的模型，并有助于提高对硫和有机化合物的大气循环的理解。

Sunlight drives the chemistry of the atmosphere by forming reactive species through photochemical processes. Several photochemical processes for gases in the atmosphere are well- known to be important to the foundation of smog and acid rain, for instance. Less understood is the role and importance of photochemical processes in the natural waters of the atmosphere, i,e, clouds, fog and rain. The objective of this project is to characterize, geographically and temporally, the formation of reactive oxidants in these atmospheric aqueous systems. The project will monitor the oxidation of chemical traps that are selectively sensitive to particular oxidants so that oxidants formed in atmospheric waters can be identified and quantified. The results will provide a data base on the photo-oxidants that are formed in atmospheric waters. This data base will assist the modelling of atmospheric oxidation and lead to improvements in the understanding of the atmospheric cycling of sulfur and organic compounds.