Characteristic Analysis of Atmospheric Black Carbon Aerosols in Changchun in Autumn and Winter

Continuous observation of atmospheric black carbon aerosols was conducted to assess the characteristics of black carbon aerosols at an urban site in Changchun,China in autumn and winter by using aethalometer.Results showed that the hourly averaged concentration of atmospheric black carbon aerosols in Changchun was 16.042 μg·m-3,with maximum of 181.014 μg·m-3,which indicated that the pollution of black carbon aerosol is very heavy.Concentration of atmospheric black carbon aerosols in Changchun in autumn are higher than that in winter.Concentration of atmospheric black carbon aerosol have obvious diurnal variations with peak value at 08:00~09:00LST and 17:00~20:00LST.Vertical temperature vertical guardian of boundary layer has a good correlation with concentration of black carbon aerosols.The weather with inverse layer of temperature,which is not favorable for diffusion of black carbon aerosols,is the main cause for high loading of black carbon aerosols in winter.