我国大范围大气细颗粒物超标问题已经严重影响到人民的生活和身体健康。大气颗粒物的多相反应是细颗粒生成和灰霾形成的潜在重要途径，但当前研究对于大气颗粒物多相反应作用机制的认识还非常有限。本项目拟将外场观测和实验室动力学研究技术相结合，首先设计基于超级站的“外场实验室”的技术示范，将环境复杂大气组分引入反应装置，从而获得实际大气状态下的多相反应动力学参数——摄取系数和增量反应性；同时揭示不同污染类型（气溶胶类型）和环境变量对气溶胶多相化学的影响，确定环境条件下在多相反应中具有显著协同效应的重要前体物；在此基础上建立环境多相反应动力学参数的数据库，为建立普适的多相反应化学表观机制提供数据平台支持；最后通过数值模型评估各种多相反应机制对二次气溶胶生成的贡献及相关控制对策。

Large scale severe fine particle pollution in China is threatening the health of people. Multiphase atmospheric chemistry has been suggested as an important pathway for the formation of fine particles and haze. Detailed mechanisms of these multiphase chemistry processes, however, are still not well understood. We intend to synthesize the field measurement approach with that of laboratory kinetic studies, and demonstrate a supersite-based "ambient laboratory" which introduces ambient air into the reactor and directly investigate the kinetics of relevant reactions, i.e., the uptake coefficient and incremental reactivity for the aerosol formation. We will investigate the dependence of multiphase chemistry on the types of air pollution and aerosol particles, and environmental conditions. We aim at identifying key gaseous precursors with significant synergistic effects on multiphase chemistry. We will establish a database to store kinetic data determined from current and future ambient laboratory studies, which may help to develop a more generalized parameterization scheme. Finally we will use numerical models to evaluate the contribution of multiphase chemistry to the aerosol formation and the relevant control strategies.