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| Titel |
Modeling the impacts of biomass burning on air quality in and around Mexico City |
| VerfasserIn |
W. Lei, G. Li, L. T. Molina |
| 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. 5 ; Nr. 13, no. 5 (2013-03-01), S.2299-2319 |
| Datensatznummer |
250018456
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| Publikation (Nr.) |
 copernicus.org/acp-13-2299-2013.pdf |
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| Zusammenfassung |
| The local and regional impacts of open fires and trash burning on
ground-level ozone (O3) and fine carbonaceous aerosols in the Mexico
City Metropolitan Area (MCMA) and surrounding region during two high fire
periods in March 2006 have been evaluated using WRF-CHEM model. The model
captured reasonably well the measurement-derived magnitude and temporal
variation of the biomass burning organic aerosol (BBOA), and the simulated
impacts of open fires on organic aerosol (OA) were consistent with many
observation-based estimates. We did not detect significant effects of open
fires and trash burning on surface O3 concentrations in the MCMA and
surrounding region. In contrast, they had important influences on OA and
elemental carbon (EC), increasing primary OA (POA) by ~60%,
secondary OA (SOA) by ~22%, total OA (TOA = POA + SOA)
by ~33%, and EC by ~22%, on
both the local (urban) and regional scales. Although the emissions of trash
burning are substantially lower than those from open fires, trash burning
made slightly smaller but comparable contributions to OA as open fires did,
and exerted an even higher influence on EC. Of the ~22%
enhancement in SOA concentrations (equivalent to a ~15%
increase in TOA) simulated, about two third was attributed to the open fires
and one-third to the trash burning. On the annual basis and taking the
biofuel use emissions into consideration, we estimated that open fires,
trash burning and biofuel use together contributed about 60% to the
loading of POA, 30% to SOA, and 25% to EC in both the MCMA and its
surrounding region, of which the open fires and trash burning contributed
about 35% to POA, 18% to SOA, and 15% to EC. The estimates of
biomass burning impacts in this study may contain considerable uncertainties
due to the uncertainties in their emission estimates in magnitude, temporal
and spatial distribution, extrapolations and the nature of spot comparison.
More observation and modeling studies are needed to accurately assess the
impacts of biomass burning on tropospheric chemistry, regional and global
air quality, and climate change. |
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