Analysis of Black Carbon fraction and aerosol scattering coefficient in smokes of remote forest fires and winter urban smogs

摘要

It is revealed on the basis of round-the-clock monitoring measurements of the scattering coefficient of the dry matter ofsubmicron aerosol at the wavelength of 0.51 μm and the mass concentration of absorbing matter at the Aerosol station ofIAO SB RAS in 1997–2017, that the average level of the Black Carbon fraction (BC-fraction) of aerosol P for densewinter urban smogs is 3 times greater compared to the smoke of remote forest fires. The average value P for situationswith enhanced values of the aerosol scattering coefficient σ > 150 Mm~(-1) (meteorological visibility range less than 26 km)in forest fire smokes is 0.027±0.01, and in winter urban smog it is 0.091±0.02. The data arrays were selected using the Pcriterionimplying the lower values of BC-fraction in the smokes of remote forest fires in comparison with thebackground aerosol.