Absorptivity of brown carbon in fresh and photo-chemically aged biomass-burning emissions
Item
Title (Dublin Core)
Absorptivity of brown carbon in fresh and photo-chemically aged biomass-burning emissions
Description (Dublin Core)
Experiments were conducted to investigate light absorption of organic aerosol (OA) in fresh and photo-chemically aged biomass-burning emissions. The experiments considered residential hardwood fuel (oak) and fuels commonly consumed in wild-land and prescribed fires in the United States (pocosin pine and gallberry). Photo-chemical aging was performed in an environmental chamber. We constrained the effective light-absorption properties of the OA using conservative limiting assumptions, and found that both primary organic aerosol (POA) in the fresh emissions and secondary organic aerosol (SOA) produced by photo-chemical aging contain brown carbon, and absorb light to a significant extent. This work presents the first direct evidence that SOA produced in aged biomass-burning emissions is absorptive. For the investigated fuels, SOA is less absorptive than POA in the long visible, but exhibits stronger wavelength-dependence and is more absorptive in the short visible and near-UV. Light absorption by SOA in biomass-burning emissions might be an important contributor to the global radiative forcing budget.
Creator (Dublin Core)
Saleh, R.
Hennigan, C. J.
McMeeking, G. R.
Chuang, W. K.
Robinson, E. S.
Coe, H.
Donahue, N. M.
Robinson, A. L.
Date (Dublin Core)
2018-01-15
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-13-7683-2013
https://acp.copernicus.org/articles/13/7683/2013/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
