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| Titel |
Biomass burning contribution to Beijing aerosol |
| VerfasserIn |
Y. Cheng, G. Engling, K.-B. He, F.-K. Duan, Y.-L. Ma, Z.-Y. Du, J.-M. Liu, M. Zheng, R. J. Weber |
| 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 (2013-08-13), S.7765-7781 |
| Datensatznummer |
250085622
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| Publikation (Nr.) |
 copernicus.org/acp-13-7765-2013.pdf |
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| Zusammenfassung |
| Biomass burning, the largest global source of elemental carbon (EC) and
primary organic carbon (OC), is strongly associated with many subjects of
great scientific concern, such as secondary organic aerosol and brown carbon
which exert important effects on the environment and on climate in
particular. This study investigated the relationships between levoglucosan
and other biomass burning tracers (i.e., water soluble potassium and
mannosan) based on both ambient samples collected in Beijing and source
samples. Compared with North America and Europe, Beijing was characterized
by high ambient levoglucosan concentrations and low winter to summer ratios
of levoglucosan, indicating significant impact of biomass burning activities
throughout the year in Beijing. Comparison of levoglucosan and water soluble
potassium (K+) levels suggested that it was acceptable to use K+
as a biomass burning tracer during summer in Beijing, while the contribution
of fireworks to K+ could be significant during winter. Moreover, the
levoglucosan to K+ ratio was found to be lower during the typical
summer period (0.21 ± 0.16) compared with the typical winter period
(0.51 ± 0.15). Levoglucosan correlated strongly with
mannosan (R2 = 0.97) throughout the winter and the levoglucosan to
mannosan ratio averaged 9.49 ± 1.63, whereas levoglucosan and mannosan
exhibited relatively weak correlation (R2 = 0.73) during the typical
summer period when the levoglucosan to mannosan ratio averaged 12.65 ± 3.38. Results from positive matrix
factorization (PMF) model analysis showed that about 50% of the OC and
EC in Beijing were associated with biomass burning processes. In addition, a
new source identification method was developed based on the comparison of
the levoglucosan to K+ ratio and the levoglucosan to mannosan ratio
among different types of biomass. Using this method, the major source of
biomass burning aerosol in Beijing was suggested to be the combustion of
crop residuals, while the contribution from softwood burning was also
non-negligible, especially in winter. |
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