活性卤氧自由基是影响极地对流层大气氧化性和物质能量循环的关键物质，对其关键化学过程的研究是认识极地乃至全球大气化学和气候环境变化的重要前沿和核心内容。然而，由于活性卤氧自由基具有活性强、浓度低、寿命短等特点，并且影响因素复杂，无法通过离线检测的方法还原其光化学过程，因此该过程中的一些关键机制仍然存在许多问题尚不明晰。本项目针对极地海洋边界层活性卤氧自由基的产生机制和化学过程中的关键科学问题，拟通过多平台高分辨的光学遥测技术更加清晰地描述极地地区对流层卤素氧化物的浓度水平和时空分布；结合环境要素，通过模型计算分析卤素物质的储库形式并揭示其反应机制，阐明影响极地边界层卤氧自由基产生的控制因素,评估活性卤素物质对极地对流层大气氧化性和生态环境的潜在影响。项目的开展将深化对极地边界层活性卤素物质化学过程的认识，完善模式模型的关键参数，为揭示极地边界层大气氧化性的变化过程提供依据。

Reactive halogen oxides radicals are known to play key roles in the troposphere oxidation capacity and circulation of materials and energy especially in polar regions. Researches on the crucial photochemical processes of reactive halogen oxides are the advancing front and core of understanding the atmospheric chemistry and global climate change. However, because of the active chemical property and low background concentration with short lifespan, as well as complex influences, it is hard to revert the process by off-line detecting methods. So there are many crucial mechanisms which are still unclear. Here we plan to carry out the high resolution optical remote sensing observations on troposphere reactive halogen oxides in polar marine boundary layer based on multi-platform. From these measurements, continues and real time variation of reactive halogen oxides column densities and distributions will be derived. Combining with the environment factors, the storage form and influence factors will be analyzed by modeling analysis. The source, sink and the release mechanisms will be discussed, and the environment influence on troposphere oxidation capacity and ecosystem will be evaluated. Finally, this project will help to understand the chemical process of reactive halogens in polar marine boundary layer and complete the key parameters of the modeling calculation, as well as establish the foundation of recognizing the mechanisms of atmospheric oxidation capacity in polar boundary layer.