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

被引：2
|
作者：
Popovicheva, O. B. [1 ]
Kozlov, V. S. [2 ]
机构：
[1] Moscow MV Lomonosov State Univ, Skobelsyn Inst Nucl Phys, Moscow, Russia
[2] Zuev Inst Atmospher Opt RAS, Tomsk, Russia
来源：
26TH INTERNATIONAL SYMPOSIUM ON ATMOSPHERIC AND OCEAN OPTICS, ATMOSPHERIC PHYSICS | 2020年 / 11560卷
关键词：
Biomass burning; flaming; smoldering; scattering; absorption; MICROPHYSICAL PROPERTIES; SMOKE; CARBON; BOREAL; SIZE; EMISSIONS;
D O I：
10.1117/12.2575583
中图分类号：
P4 [大气科学（气象学）];
学科分类号：
0706 ; 070601 ;
摘要：
Impact of Siberian biomass burning phase on optical properties of smoke aerosols is investigated in small-scale 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.
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页数：7
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