Selective absorption in the visible spectrum of dust haze over Middle East in spring 2022

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Based on monitoring data from AERONET stations in spring 2022, variations in the optical and microphysical characteristics of dust aerosol during a large-scale dust haze in the Middle East were analyzed. It was shown that the coarse fraction of dust aerosol dominates the particle size distribution, with a modal radius ranging from 1.70 to 2.95 µm. The imaginary part of the refractive index of dust aerosol particles reaches 0.042, and the single scattering albedo varies from 0.70 to 0.99. Selective absorption of dust aerosol at a wavelength of 675 nm was found to be associated with the presence of the mineral goethite in the dust aerosol particles. The selective absorption at a wavelength of 440 nm, attributed to hematite, is relatively small 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 emission sources of dust aerosol were identified.

作者简介

G. Gorchakov

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Email: gengor@ifaran.ru
Moscow, Russia

O. Datsenko

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Moscow, Russia

A. Karpov

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Moscow, Russia

R. Gushchin

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Moscow, Russia

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