ANOMALOUS ABSORPTION OF SMOKE AEROSOL IN THE VISIBLE AND NEAR-INFRARED OF SPECTRUM INTERVALS

G. I. Gorchakov; Горчаков Г. И.; R. A. Gushchin; Гущин Р. А.; V. M. Kopeikin; Копейкин В. М.; A. V. Karpov; Карпов А. В.; E. G. Semoutnikova; Семутникова Е. Г.; O. I. Datsenko; Даценко О. И.; T. Ya. Ponomareva; Пономарева Т. Я.

doi:10.31857/S2686739723600030

ANOMALOUS ABSORPTION OF SMOKE AEROSOL IN THE VISIBLE AND NEAR-INFRARED OF SPECTRUM INTERVALS

Authors: Gorchakov G.I.¹, Gushchin R.A.¹, Kopeikin V.M.¹, Karpov A.V.¹, Semoutnikova E.G.², Datsenko O.I.³, Ponomareva T.Y.¹
Affiliations:
1. A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences
2. M.V. Lomonosov Moscow State University, Faculty of Physics
3. Hydrometeorological Research Center of Russia
Issue: Vol 510, No 1 (2023)
Pages: 92-98
Section: ATMOSPHERIC AND HYDROSPHERIC PHYSICS
Submitted: 14.10.2023
Published: 01.05.2023
URL: https://journal-vniispk.ru/2686-7397/article/view/135854
DOI: https://doi.org/10.31857/S2686739723600030
EDN: https://elibrary.ru/FGJJXY
ID: 135854

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Abstract

In large-scale smoke haze during mass fires in the boreal forests of Alaska in July 2019 in the visible and near infrared of spectrum intervals 440–1020 nm, according to monitoring data on the network of AERONET stations of the spectral dependences of the refractive index imaginary part, anomalous absorption of the fine smoke aerosol was found. Variations in the spectral dependences of the aerosol optical extinction and absorption depths, as well as the size distribution function of aerosol particles, are analyzed. With anomalous absorption, the imaginary part of the refractive index increased by a factor of 1.8–7.2 with increasing wavelength from 440 to 1020 nm, reaching a value of 0.315 for the wavelength of 1020 nm. A power-law approximation of the spectral dependence of the refractive index imaginary part with exponents approximately from 0.7 to 2.3 is proposed.

Keywords

large-scale forest fires, smoke aerosol, optical and microphysical characteristics, aerosol optical depth, particle size distribution, imaginary part of refractive index, anomalous absorption, visible and near infrared spectrum intervals

References

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