Impact of combustion phase on scattering and spectral absorption of Siberian biomass burning:  studies in Large Aerosol Chamber

O. B. Popovicheva; V. S. Kozlov

doi:10.1117/12.2575583

12 November 2020 Impact of combustion phase on scattering and spectral absorption of Siberian biomass burning: studies in Large Aerosol Chamber

O. B. Popovicheva, V. S. Kozlov

Author Affiliations +

Proceedings Volume 11560, 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics; 115604N (2020) https://doi.org/10.1117/12.2575583
Event: 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 2020, Moscow, Russian Federation

Abstract

Impact of Siberian biomass burning phase on optical properties of smoke aerosols is investigated in smallscale fires performed in a Large Aerosol Chamber (LAC). The analyses have revealed the influence of combustion temperature on scattering and light absorption of pine and debris smoke. Scattering in smoldering phase is significantly exceeding the flaming one. Spectral absorption obtained throughout the near-ultraviolet to near-infrared spectral region emphasizes the high absorption Angstrom exponent (AAE), up to 4.4 for fresh debris smoke, and a large fraction of light-absorbing brown carbon (BrC) in the smoldering phase. In opposite, open flaming smoke shows low AAE around 1, typical for high-temperature fossil fuel combustion while mixed fires emit particles absorbing with the intermediate AAE characteristics.

Citation Download Citation

O. B. Popovicheva and V. S. Kozlov "Impact of combustion phase on scattering and spectral absorption of Siberian biomass burning: studies in Large Aerosol Chamber", Proc. SPIE 11560, 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 115604N (12 November 2020); https://doi.org/10.1117/12.2575583

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