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| Titel |
Size-dependent wet removal of black carbon in Canadian biomass burning plumes |
| VerfasserIn |
J. W. Taylor, J. D. Allan, G. Allen, H. Coe, P. I. Williams, M. J. Flynn, M. Le Breton, J. B. A. Muller, C. J. Percival, D. Oram, G. Förster, J. D. Lee, A. R. Rickard, M. Parrington, P. I. Palmer |
| 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 ; 14, no. 24 ; Nr. 14, no. 24 (2014-12-22), S.13755-13771 |
| Datensatznummer |
250119264
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| Publikation (Nr.) |
 copernicus.org/acp-14-13755-2014.pdf |
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| Zusammenfassung |
| Wet deposition is the dominant mechanism for removing black carbon (BC) from
the atmosphere and is key in determining its atmospheric lifetime, vertical
gradient and global transport. Despite the importance of BC in the climate
system, especially in terms of its ability to modulate the radiative energy
budget, there are few quantitative case studies of wet removal in ambient
environments. We present a case study of BC wet removal by examining aerosol
size distributions and BC coating properties sampled in three Canadian boreal
biomass burning plumes, one of which passed through a precipitating cloud.
This depleted the majority of the plume's BC mass, and the largest and most
coated BC-containing particles were found to be preferentially removed,
suggesting that nucleation scavenging was likely the dominant mechanism.
Calculated single-scattering albedo (SSA) showed little variation, as a large
number of non-BC particles were also present in the precipitation-affected
plume. The remaining BC cores were smaller than those observed in previous
studies of BC in post-precipitation outflow over Asia, possibly due to the
thick coating by hydrophilic compounds associated with the Canadian biomass
burning particles. This study provides measurements of BC size, mixing state
and removal efficiency to constrain model parameterisations of BC wet removal
in biomass burning regions, which will help to reduce uncertainty in
radiative forcing calculations. |
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