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Abstract <p>Based on monitoring data from AERONET stations, variations in the optical and microphysical characteristics of dust aerosol during a large-scale dust haze over the Middle East in spring 2022 are analyzed. It is shown that the coarse fraction of dust aerosol with a mode radius from 1.70 to 2.95 µm dominates the particle size distribution. The imaginary part of the refractive index of the aerosol substance reaches 0.042, and the single-scattering albedo varies from 0.70 to 0.99. Selective absorption of dust aerosol is found at a wavelength of 675 nm, which is associated with the presence of the mineral goethite in the dust aerosol particles. The selective absorption at a wavelength of 440 nm induced by hematite is relatively insignificant in the examined dust haze: the imaginary part of the refractive index reaches approximately 0.005, and the single-scattering albedo varies from 0.90 to 0.99. Regional hotspots of dust aerosol emission are identified.</p>

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Selective Absorption of a Dust Haze in the Visible Spectrum over the Middle East in Spring 2022

  • 期刊论文

  • 发表日期：

    2025年2月1日

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

摘要

Abstract

Based on monitoring data from AERONET stations, variations in the optical and microphysical characteristics of dust aerosol during a large-scale dust haze over the Middle East in spring 2022 are analyzed. It is shown that the coarse fraction of dust aerosol with a mode radius from 1.70 to 2.95 µm dominates the particle size distribution. The imaginary part of the refractive index of the aerosol substance reaches 0.042, and the single-scattering albedo varies from 0.70 to 0.99. Selective absorption of dust aerosol is found at a wavelength of 675 nm, which is associated with the presence of the mineral goethite in the dust aerosol particles. The selective absorption at a wavelength of 440 nm induced by hematite is relatively insignificant in the examined dust haze: the imaginary part of the refractive index reaches approximately 0.005, and the single-scattering albedo varies from 0.90 to 0.99. Regional hotspots of dust aerosol emission are identified.