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| Titel |
Wildfire smoke in the Siberian Arctic in summer: source characterization and plume evolution from airborne measurements |
| VerfasserIn |
J.-D. Paris, A. Stohl, P. Nédélec, M. Yu. Arshinov, M. V. Panchenko, V. P. Shmargunov, K. S. Law, B. D. Belan, P. Ciais |
| 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 ; 9, no. 23 ; Nr. 9, no. 23 (2009-12-11), S.9315-9327 |
| Datensatznummer |
250007794
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| Publikation (Nr.) |
 copernicus.org/acp-9-9315-2009.pdf |
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| Zusammenfassung |
We present airborne measurements of carbon dioxide (CO2), carbon
monoxide (CO), ozone (O3), equivalent black carbon (EBC) and ultra fine
particles over North-Eastern Siberia in July 2008 performed during the
YAK-AEROSIB/POLARCAT experiment. During a "golden day" (11 July 2008) a
number of biomass burning plumes were encountered with CO mixing ratio
enhancements of up to 500 ppb relative to a background of 90 ppb. Number
concentrations of aerosols in the size range 3.5–200 nm peaked at 4000 cm−3
and the EBC content reached 1.4 μg m−3. These high
concentrations were caused by forest fires in the vicinity of the landing
airport in Yakutsk where measurements in fresh smoke
could be made during the descent. We estimate a combustion efficiency of 90 ± 3% based on
CO and CO2 measurements and a CO emission factor of 65.5 ± 10.8 g CO per kilogram
of dry matter burned. This suggests a potential increase in the
average northern hemispheric CO mixing ratio of 3.0–7.2 ppb per million hectares
of Siberian forest burned. For BC, we estimate an emission factor
of 0.52 ± 0.07 g BC kg−1, comparable to values reported in the
literature. The emission ratio of ultra-fine particles (3.5–200 nm) was 26 cm−3
(ppb CO)−1, consistent with other airborne studies.
The transport of identified biomass burning plumes was investigated using
the FLEXPART Lagrangian model. Based on sampling of wildfire plumes from the
same source but with different atmospheric ages derived from FLEXPART, we
estimate that the e-folding lifetimes of EBC and ultra fine particles
(between 3.5 and 200 nm in size) against removal and growth processes are
5.1 and 5.5 days respectively, supporting lifetime estimates used in various
modelling studies. |
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