广州市冬季PM2.5污染过程二次水溶性无机离子组分特征

摘要

In order to understand the origin of haze in Guangzhou, the mass concentrations of water-solubility ions were monitored during two haze events(1st-8th,Dec 2013)at Guangzhou Atmospheric Supersite.The results indicated as follows: The concentrations of SO2-4,NO-3 and NH+4 accounted for 15.8%, 7.4% and 7.0% of PM2.5, respectively.SNA increased significantly during two pollution process.Vehicle emission and coal combustion were the major pollution sources of PM2.5 in Guangzhou.Besides, Guangzhou belongs to rich ammonia area in winter, NH+4 increased significantly during two pollutant episode.In addition, NH+4existed in the form of (NH4)2SO4 and NH4NO3 in PM2.5 during the observation.%为了解广州地区灰霾天气成因,基于城市超级站,对2013年12月1日-12月8日期间2次灰霾天气过程的水溶性无机离子污染特征进行研究.结果表明:监测期间二次离子(SNA)SO2-4、NO-3、NH+4分别占PM2.5质量浓度的15.8%、7.4%、7.0%;2次污染过程SNA对PM2.5贡献显著,机动车排放和燃煤是PM2.5的主要污染来源.广州冬季属于富氨区,2次污染过程都伴随着NH+4显著增加,NH+4 主要以(NH4)2SO4和NH4NO3形式存在.