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标题：Airborne measurements of aerosols and carbon dioxide during a prescribed fire experiment at a boreal forest site
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作者：Aki Virkkula ; Toivo Pohja ; Pasi P. Aalto 等
期刊名称：Boreal Environment Research
印刷版ISSN：1239-6095
出版年度：2014
卷号：19
页码：153-181
语种：English
出版社：Finnish Limnological Society
摘要：During a prescribed fire experiment, CO2 and particle number concentrations, light scattering and absorption coefficients were measured from a Cessna 172 airplane. Peak number concentrations were (3 ± 1) ¥ 106 cm–3 and they decreased faster than what can be explained by coagulation alone. The single-scattering albedo of particles grew from the values of 0.4 ± 0.1 closest to the emissions to the values of 0.8 ± 0.1 at the distance of 400 m from the emissions. The mean Ångström exponent of absorption, 1.70 ± 0.24, is in line with the published spectral absorption values of wood-smoke aerosol. The estimated emission factors were 1600 ± 1020, 5.9 ± 6.3 and 1.4 ± 1.0 g kg–1 (dry biomass), for CO2, particulate organic matter and black carbon (BC), respectively, and (4.8 ± 2.9) ¥ 1015 particles per kg (dry biomass) for the particle number. The BC emission factor may be overestimated by a factor of about 1.6 ± 0.2 due to condensation of organics on the filter of the absorption photometer. During the smoldering phase, there were clear indications of new particle formation.