title: [Characteristics and Parameterization for Atmospheric Extinction Coefficient in Beijing].
abstract: In order to study the characteristics of atmospheric extinction coefficient in Beijing, systematic measurements had been carried out for atmospheric visibility, PM2.5 concentration, scattering coefficient, black carbon, reactive gases, and meteorological parameters from 2013 to 2014. Based on these data, we compared some published fitting schemes of aerosol light scattering enhancement factor [ f(RH)], and discussed the characteristics and the key influence factors for atmospheric extinction coefficient. Then a set of parameterization models of atmospheric extinction coefficient for different seasons and different polluted levels had been established. The results showed that aerosol scattering accounted for more than 94% of total light extinction. In the summer and autumn, the aerosol hygroscopic growth caused by high relative humidity had increased the aerosol scattering coefficient by 70 to 80 percent. The parameterization models could reflect the influencing mechanism of aerosol and relative humidity upon ambient light extinction, and describe the seasonal variations of aerosol light extinction ability.
authors: Yi-na
authors: YN
authors: Chen
authors: Pu-sheng
authors: PS
authors: Zhao
authors: Di
authors: D
authors: He
authors: Fan
authors: F
authors: Dong
authors: Xiu-juan
authors: XJ
authors: Zhao
authors: Xiao-ling
authors: XL
authors: Zhang
mesh_terms: D000336:Aerosols; D000397:Air Pollution / Q000032:analysis*; D000068476:Beijing; D004784:Environmental Monitoring; D006813:Humidity; D008027:Light; D052638:Particulate Matter / Q000032:analysis*; D012621:Seasons; D053260:Soot
chemical_list: D000336:Aerosols; D052638:Particulate Matter; D053260:Soot