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Abstract— <p>Variations in the optical and microphysical properties of aerosols in winter nonphotochemical smog were analyzed using AERONET data for the North China Plain in January 2013. At aerosol optical depth from 1.31 to 3.26 on the wavelength of 440 nm the single scattering albedo reaches 0.99 (“white smog”). The optically dense Beijing smog was dominated by the finely dispersed aerosol fraction with the median radius of 0.15–0.25 μm (up to 0.35 μm in three cases). Anomalous selective aerosol absorption was observed in the winter nonphotochemical smog at the AERONET Taihu station with the aerosol optical depth varying between 0.38 and 1.00, as the imaginary part of the refractive index at a wavelength of 1020 nm ranged from 0.029 to 0.107, and the single scattering albedo from 0.60 to 0.83. The median radius of the fine fraction varied from 0.15 to 0.20 μm.</p>

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Microstructure and Absorption Capacity of Aerosol in Nonphotochemical Smog

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • G. I. Gorchakov,
  • O. I. Datsenko,
  • A. V. Karpov,
  • R. A. Gushchin

摘要

Abstract—

Variations in the optical and microphysical properties of aerosols in winter nonphotochemical smog were analyzed using AERONET data for the North China Plain in January 2013. At aerosol optical depth from 1.31 to 3.26 on the wavelength of 440 nm the single scattering albedo reaches 0.99 (“white smog”). The optically dense Beijing smog was dominated by the finely dispersed aerosol fraction with the median radius of 0.15–0.25 μm (up to 0.35 μm in three cases). Anomalous selective aerosol absorption was observed in the winter nonphotochemical smog at the AERONET Taihu station with the aerosol optical depth varying between 0.38 and 1.00, as the imaginary part of the refractive index at a wavelength of 1020 nm ranged from 0.029 to 0.107, and the single scattering albedo from 0.60 to 0.83. The median radius of the fine fraction varied from 0.15 to 0.20 μm.