上海市典型霾污染过程二次无机气溶胶组分特征研究  

Chemical Characteristics of Secondary Inorganic Aerosols during a Typical Haze Episode in Shanghai

作　　者：张懿华[1] 

机构地区：[1]上海市环境监测中心,上海200030

出　　处：《环境监测管理与技术》2011年第B12期7-13,共7页The Administration and Technique of Environmental Monitoring

基　　金：上海市环境保护科学发展基金资助项目(09-26)

摘　　要：2010年的5月19日—5月21日,上海市出现持续性高浓度细颗粒物的霾污染过程。在线气溶胶离子组分监测结果表明,SO42-、NO3-和NH4+二次离子成分是该次污染过程的主要贡献者。通过污染过程分析发现,有利的反应条件、充足的气态前体物和一定的大气氧化性使得NO2迅速向颗粒态转化,加上陆地排放的SO2经充分二次转化后重新从海面输送回来,导致PM2.5浓度交替出现峰值,形成连续霾污染。因此,为有效控制上海市霾污染,必须协同控制NOx和SO2气态污染物,前者因其转化速度快且具有复合效应需严控上海排放源,后者因其区域长距离输送特性应加强区域联防联控。A continuous haze episode with high concentration of fine particulate matter occurred in Shanghai from May 19 th to May 21 th,2010.Results of the online monitoring of ion composition in aerosols indicated that three secondary ions,sulfate,nitrate and ammonium,were the main contributors to this haze episode.Through pollution analysis,it could be found that favorable reaction conditions,sufficient gaseous precursors and atmospheric oxidation helped NO2 transform from gas to aerosol rapidly,and sulfate was transported back from sea surface after thorough secondary transformation of SO2 which was emitted from land.These two factors caused alternation of PM2.5 concentration peaks to form continuous haze pollution.Therefore,nitrogen oxides and sulfur dioxide should be controlled synergistically to effectively control haze pollution in Shanghai.For nitrogen oxides,local emission sources should be controlled strictly due to the fast transformation rate and complex effect.For sulfur dioxide,attention should be paid to regional joint control due to its long-range transportion.

关 键 词：细颗粒 PM2.5 霾污染 二次气溶胶 水溶性离子 上海市 

分 类 号：X513[环境科学与工程—环境工程]