大气氮硫化合物间的非均相耦合转化及其对灰霾形成的影响

经济和城市化的迅速发展使我国许多城市灰霾事件频发，大气气溶胶污染特别是二次无机离子污染已成为一个严重环境问题。然而，目前对涉及二次无机离子形成的大气氮硫化合物间的非均相耦合转化的研究很少。本项目拟利用DRIFTS、LP-FTIR、Flow tube reactor、GC-MS、IC、MARGA、Aethalometer等多种实验手段和监测设备开展大气氮硫化合物间的非均相耦合转化及其对灰霾形成的影响研究，考察大气氮硫化合物间发生非均相耦合转化时的反应活性及机理，揭示大气氮硫化合物非均相转化过程间的相互影响、影响机制、潜在的非均相转化途径及其对灰霾形成产生的可能影响。开展此项研究，可丰富对大气气溶胶表面非均相反应的认识，全面了解大气含硫和含氮化合物的大气化学过程，有助于探索灰霾事件中硫酸盐气溶胶与硝酸盐气溶胶间负相关依赖关系的形成机制，也有助于为我国城市大气污染控制和决策制定提供重要科学依据。

Rapid economic development and urbanization in recent years have resulted in serious air pollution in many cities in China. Urban haze episodes have occurred more frequently. Atmospheric aerosol pollution has become a serious environmental problem, especially secondary inorganic ion pollution. However, a little concern has been paid to the chemical coupling between the heterogeneous processes of atmospheric nitrogen and sulfur compounds up to now, despite the fact that the coupling involves the formation of the secondary inorganic ions. Here we study the chemical coupling between the heterogeneous processes of atmospheric nitrogen and sulfur compounds and its impact on the formation of haze by using various measurement techniques and monitoring instruments including DRIFTS、LP-FTIR、Flow tube reactor、GC-MS、IC、MARGA、Aethalometer, et al., investigating the corresponding reactivity and reaction mechanisms in the presence of the chemical coupling, and revealing the influence of chemical coupling on the heterogeneous conversion processes of atmospheric sulfur-containing compound and nitrogen-containing compound and its influence mechanisms, potential heterogeneous conversion pathways, and its possible impact on the formation of haze. This study not only helps to further understand the heterogeneous reaction of atmospheric aerosol, towards a more comprehensive understanding of the atmospheric chemical processes of atmospheric sulfur-containing and nitrogen-containing compounds, but also helps to explore the formation mechanism of the negative linear dependence between atmospheric sulfate and nitrate aerosols during haze episodes. This study also provides important information for the government to formulate urban air pollution control strategy and policy.