武汉地区沙尘天气气溶胶粒径分布特性研究

通过利用湖北省大气复合污染自动监控预警中心的振荡天平法颗粒物监测仪、光散射法气溶胶粒径谱仪,对武汉地区一次典型沙尘天气过程中记录的不同粒径气溶胶颗粒数量浓度、相对质量浓度进行研究。结果表明,在武汉地区沙尘天气过程中,粗颗粒显著增多,而细颗粒显著减少,这与部分研究发现的沙尘天气过程中粗颗粒与细颗粒共同显著增多的结论有所不同。粒径谱仪分析显示,大于PM5颗粒的增多对粗颗粒浓度增加有显著贡献,而小于PM0.5颗粒的减少则对细颗粒浓度降低有主要贡献,这可能是武汉地区沙尘天气过程颗粒物的变化特点。

Aerosol Particle Size Distribution Research During Sand Storm in Wuhan Area

Research on aerosol size distribution, number concentration and relative mass concentration during a typical sand storm in Wuhan, Hubei Province central China was achieved. The data included particulate monitor 1405D, 1405 by tapered element oscillating microbalance from Thermo-Fisher and spectrometers by optical scattering method from GRIMM, also called environment dust monitor (EDM) 180. The results indicate that coarse particles increase remarkably while fine particles decrease remarkably as well during sand storm in Wuhan. There appears an obvious difference between Wuhan and other researches focused on the increase of both coarse particles and fine particles. According to EDM 180 data, aerosol greater than PM₅ mostly affect the increase of coarse particles while aerosol smaller than PM_0.5 mostly affect the decrease of fine particles, which might be a variation characteristic of aerosol during sand storm in Wuhan.