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    Author(s): Yuan Cheng; Guenter Engling; Hans Moosmuller; W. Patrick Arnott; Antony L. W. Chen; Cyle E. WoldWei Min Hao; Ke-Bin He
    Date: 2016
    Source: Atmospheric Environment. 127: 347-354.
    Publication Series: Scientific Journal (JRNL)
    Station: Rocky Mountain Research Station
    PDF: Download Publication  (1.0 MB)

    Description

    Black carbon (BC) aerosol has relatively short atmospheric lifetimes yet plays a unique and important role in the Earth's climate system, making it an important short-term climate mitigation target. Globally, biomass burning is the largest source of BC emissions into the atmosphere. This study investigated the mass absorption efficiency (MAE) of biomass burning BC generated by controlled combustion of various wildland fuels during the Fire Laboratory at Missoula Experiments (FLAME). MAE values derived from a photoacoustic spectrometer (~7.8 m2/g at a wavelength of 532 nm) were in good agreement with those suggested for uncoated BC when the emission ratios of organic carbon (OC) to elemental carbon (EC) were extremely low (i.e., below 0.3). With the increase of OC/EC, two distinct types of biomass smoke were identified. For the first type, MAE exhibited a positive dependence on OC/EC, while the overestimation of the light absorption coefficient (babs) by a filter-based method was less significant and could be estimated by a nearly constant correction factor. For the second type, MAE was biased low and correlated negatively with OC/EC, while the overestimation of babs by the filter-based method was much more significant and showed an apparent OC/EC dependence. This study suggests that BC emission factors determined by the commonly used thermal-optical methods might be substantially overestimated for some types of biomass burning emissions. Our results also indicate that biomass burning emissions may include some liquid-like organics that can significantly bias filter-based babs measurements.

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    Citation

    Cheng, Yuan; Engling, Guenter; Moosmuller, Hans; Arnott, W. Patrick; Chen, Antony L. W.; Wold, Cyle E.; Hao, Wei Min; He, Ke-Bin. 2016. Light absorption by biomass burning source emissions. Atmospheric Environment. 127: 347-354.

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    Keywords

    biomass burning, light absorption, black carbon, photoacoustic, liquid-like organics

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https://www.fs.usda.gov/treesearch/pubs/57172