北京地区细粒子数浓度粒径分布及分粒径化学组分的城郊对比研究

The pollution of fine particles in Beijing has become increasingly conspicuous. The measurements of size distribution and size-resolved chemical compositions are the foundation of mechanism study of fog and hazy and other related studies. To date, there is not a study for comparisons of number size distributions and size-resolved chemical compositions of fine particles between urban and suburban in China. In this project, number size distributions and size-resolved chemical compositions of fine particles are planned to be synchronously measured at urban site and Shangdianzi background station of Beijing in the summer and winter. The variations and differences of number size distributions and size-resolved chemical compositions for particles under different diurnal periods, different seasons, and different meteorological and pollution conditions will be studied. The main sources of particles in different modes in urban and suburban areas will be evaluated. The variations of physical parameters and effects of chemical components will be discussed for new particle formation processes in urban and suburban areas.

北京地区细粒子污染较重，对气溶胶粒径分布及其化学组成开展观测，是进一步开展雾霾机理与其它相关研究的基础。目前同时对气溶胶数粒度谱和分粒径化学组分开展观测，并进行城郊对比的研究还鲜有开展。本项目拟在北京城区和上甸子本底站，在夏季和冬季同时开展细粒子谱和分粒径化学组分观测。研究城区和郊区不同时段、不同季节、不同气象或污染条件下细粒子数浓度分布及不同模态下化学组成的变化特征和差异，评估城郊不同模态气溶胶的主要来源；对比分析城郊新粒子在生成及增长的不同阶段中，相关物理参数的变化特点及不同化学组分的作用和贡献情况，并明确主要影响条件和程度。

北京地区细粒子污染较重，对气溶胶粒径分布及其化学组成开展观测，是进一步开展雾霾机理与其它相关研究的基础。目前同时对气溶胶数粒度谱和分粒径化学组分开展观测，并进行城郊对比的研究还鲜有开展。本项目在北京城区和上甸子本底站，在一年四季同时开展细粒子谱和分粒径化学组分观测。研究城区和郊区不同时段、不同季节、不同气象或污染条件下细粒子数浓度分布及不同模态下化学组成的变化特征和差异；对比分析城郊新粒子在生成及增长的不同阶段中，相关物理参数的变化特点及不同化学组分的作用和贡献情况，并明确主要影响条件和程度。