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| Titel |
Biomass burning impact on PM 2.5 over the southeastern US during 2007: integrating chemically speciated FRM filter measurements, MODIS fire counts and PMF analysis |
| VerfasserIn |
X. Zhang, A. Hecobian, M. Zheng, N. H. Frank, 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 ; 10, no. 14 ; Nr. 10, no. 14 (2010-07-23), S.6839-6853 |
| Datensatznummer |
250008657
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| Publikation (Nr.) |
 copernicus.org/acp-10-6839-2010.pdf |
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| Zusammenfassung |
| Archived Federal Reference Method (FRM) Teflon filters used by state
regulatory agencies for measuring PM2.5 mass were acquired from 15 sites
throughout the southeastern US and analyzed for water-soluble
organic carbon (WSOC), water-soluble ions and carbohydrates to investigate
biomass burning contributions to fine aerosol mass. Based on over 900 filters
that spanned all of 2007, levoglucosan and K+ were studied in
conjunction with MODIS Aqua fire count data to compare their performances as
biomass burning tracers. Levoglucosan concentrations exhibited a distinct
seasonal variation with large enhancement in winter and spring and a minimum
in summer, and were well correlated with fire counts, except in winter when
residential wood burning contributions were significant. In contrast, K+
concentrations had no apparent seasonal trend and poor correlation with
fire counts. Levoglucosan and K+ only correlated well in winter
(r2=0.59) when biomass burning emissions were highest, whereas in other
seasons they were not correlated due to the presence of other K+
sources. Levoglucosan also exhibited larger spatial variability than
K+. Both species were higher in urban than rural sites (mean 44%
higher for levoglucosan and 86% for K+). Positive Matrix
Factorization (PMF) was applied to analyze PM2.5 sources and four
factors were resolved: biomass burning, refractory material, secondary light
absorbing WSOC and secondary sulfate/WSOC. The biomass burning source
contributed 13% to PM2.5 mass annually, 27% in winter, and less
than 2% in summer, consistent with other souce apportionment studies
based on levoglucosan, but lower in summer compared to studies based on
K+. |
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