Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 2, Pages 742-748Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL058392
Keywords
biomass burning; single scattering albedo; combustion efficiency; brown carbon; wavelength dependence; FLAME
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Funding
- U.S. Department of Energy [F265, KP1701]
- LANL-Laboratory Directed Research and Development
- NSF [ATM-0936321]
- NASA Earth Science Division [NNX12AH17G]
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [0936321] Funding Source: National Science Foundation
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Single scattering albedo () of fresh biomass burning (BB) aerosols produced from 92 controlled laboratory combustion experiments of 20 different woods and grasses was analyzed to determine the factors that control the variability in . Results show that varies strongly with fire-integrated modified combustion efficiency (MCEFI)higher MCEFI results in lower values and greater spectral dependence of . A parameterization of as a function of MCEFI for fresh BB aerosols is derived from the laboratory data and is evaluated by field observations from two wildfires. The parameterization suggests that MCEFI explains 60% of the variability in , while the 40% unexplained variability could be accounted for by other parameters such as fuel type. Our parameterization provides a promising framework that requires further validation and is amenable for refinements to predict with greater confidence, which is critical for estimating the radiative forcing of BB aerosols. Key Points Aerosol single scattering albedo depends most strongly on combustion efficiency Parameterization of single scattering albedo of fresh biomass burning aerosols Strong spectral variation of single scattering albedo is observed
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