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| Titel |
Absorptivity of brown carbon in fresh and photo-chemically aged biomass-burning emissions |
| VerfasserIn |
R. Saleh, C. J. Hennigan, G. R. McMeeking, W. K. Chuang, E. S. Robinson, H. Coe, N. M. Donahue, A. L. Robinson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 15 ; Nr. 13, no. 15 (2013-08-09), S.7683-7693 |
| Datensatznummer |
250085617
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| Publikation (Nr.) |
 copernicus.org/acp-13-7683-2013.pdf |
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| Zusammenfassung |
| 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. |
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