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| Titel |
Brown carbon in tar balls from smoldering biomass combustion |
| VerfasserIn |
R. K. Chakrabarty, H. Moosmüller, L.-W. A. Chen, K. Lewis, W. P. Arnott, C. Mazzoleni, M. K. Dubey, C. E. Wold, W. M. Hao, S. M. Kreidenweis |
| 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 ; 10, no. 13 ; Nr. 10, no. 13 (2010-07-13), S.6363-6370 |
| Datensatznummer |
250008623
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| Publikation (Nr.) |
 copernicus.org/acp-10-6363-2010.pdf |
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| Zusammenfassung |
| We report the direct observation of laboratory production of spherical,
carbonaceous particles – "tar balls" – from smoldering combustion of two
commonly occurring dry mid-latitude fuels. Real-time measurements of
spectrally varying absorption Ångström coefficients (AAC) indicate
that a class of light absorbing organic carbon (OC) with wavelength
dependent imaginary part of its refractive index – optically defined as
"brown carbon" – is an important component of tar balls. The spectrum of
the imaginary parts of their complex refractive indices can be described
with a Lorentzian-like model with an effective resonance wavelength in the
ultraviolet (UV) spectral region. Sensitivity calculations for
aerosols containing traditional OC (no absorption at visible and UV
wavelengths) and brown carbon suggest that accounting for near-UV absorption
by brown carbon leads to an increase in aerosol radiative forcing efficiency
and increased light absorption. Since particles from smoldering combustion
account for nearly three-fourths of the total carbonaceous aerosol mass
emitted globally, inclusion of the optical properties of tar balls into
radiative forcing models has significance for the Earth's radiation budget,
optical remote sensing, and understanding of anomalous UV absorption in the
troposphere. |
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