Remote biomass burning (forest and savanna fires, agricultural burning, etc.) is a major source of both primary (ash, elemental carbon) and secondary (organic carbon, sulfate, nitrate, and ammonium) aerosol. The chemical composition of the aerosol produced depends on the characteristics of the combustion: hot, flaming fires (e.g., savanna fires) emit mainly EC aerosol, while smoldering fires emit mainly organic particles (Andreae, 1995). The number concentrations of aerosols produced by biomass fires are of the order of tens of thousands of particles per cubic centimeter close to the source and less than 1000/cm3 after a few days of transport. Mass median diameters in fresh fire plumes are typically in the range of 0.1 to 0.3 pm and evolve toward values in the range of 0.2 to 0.4 pm during the first few hours after
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