Characteristics of Atmospheric Extinction Coefficient and Its Components in Baoji High-Tech Zone in Winter

Abstract

Abstract:

In order to understand the extinction characteristics of aerosols and gases in Baoji High-tech Zone, the hourly observation data of the nephelometer and aethalometer in Baoji High-tech Zone in January 2018, as well as the meteorological elements and the mass concentration of PM_2.5 and NO₂in the same section were used to analyze the variation characteristics of extinction coefficient B_ext, aerosol scattering coefficient B_sp, absorption coefficient B_ap and gas absorption coefficient B_ag, and then the contribution rate of aerosol extinction coefficient and gas extinction coefficient to atmospheric extinction were evaluated. The results show that, B_ext of Baoji High-tech Zone ranges from 200.63 ~ 948.87 Mm^-1 with a mean value of 483.12 Mm^-1, B_spof aerosol ranges from 170.83 ~ 890.06 Mm^-1 with a mean value of 444.11 Mm^-1, while B_ap ranged from 4.89 ~ 20.44 Mm^-1 with a mean value of 9.69 Mm^-1. The correlation coefficients of PM_2.5 and B_ext, B_spand B_ap are 0.952, 0.950 and 0.572, respectively, indicating that the influence of PM_2.5 in Baoji High-tech Zone on atmospheric extinction can not be ignored. It is also found that the aerosol scattering coefficient B_sp is significantly positively correlated with relative humidity (RH) and negatively correlated with visibility. It seems that aerosol scattering and absorption coefficients had significant double peak and double valley diurnal variation characteristics, which is related to Baoji High-tech Zone's commuting time and motor vehicle running time. It is also found that Black carbon (BC) mass concentration,,B_sp and B_ap increased as the pollution level increased. The overall analysis shows that the extinction coefficient of aerosol accounts for 93.93% of the total atmospheric extinction coefficient, in which scattering and absorption coefficients accounts for 91.92% and 2.01% respectively, and the extinction coefficient of gases accounts for 6.07% of the total atmospheric extinction coefficient.

Key words: extinction coefficient, aerosol, diurnal variation, contribution rate

CLC Number:

X515

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