上海大气纳米颗粒物粒径分布研究

Study on Size Distribution of Aerosol Nanoparticulates in Shanghai City

为了更深入地研究上海大气气溶胶微小颗粒物的物理和化学特性,采用MSP公司生产的WPSTMModel1000XP宽范围粒径谱仪测量粒径介于10～10000nm的气溶胶纳米颗粒物,探讨粒径在10～500nm间的气溶胶纳米颗粒物随时间、高度和地区变化的时空分布特征.结果表明,总质量浓度随时间的变化比总粒子数浓度的变化滞后,纳米颗粒物总粒子数浓度和质量浓度随高度增加呈指数衰减.纳米颗粒物总粒子数浓度和质量浓度在工业区和商业区较高而在生活区和郊区较低.超细颗粒对粒子数浓度贡献较大而细颗粒对粒子质量浓度贡献较大.

In order to study the physical and chemical characterization of aerosol nanoparticulates in Shanghai City,the wide range particle spectrometer(Model 1000XP WPS) produced by MSP Corporation was used to measure the aerosol particulate sizes ranging from 10 to 10000 nm in December of 2005.The results showed that the distribution of particulates in a size range from 10 to 500 nm was variable with time,height and district.It was found that the change of mass concentration varying with time was later than that of number concentration.Both concentrations of particulate matter presented the exponential decay with the height increasing.And they were higher in industrial area and shopping center but lower in living district and suburb.The results indicated that the ultrafine matter(<100 nm) mainly contributed to number concentration and the fine matter(>100 nm) mainly contributed to mass concentration.