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| Titel |
Quantitative evaluation of emission controls on primary and secondary organic aerosol sources during Beijing 2008 Olympics |
| VerfasserIn |
S. Guo, M. Hu, Q. Guo, X. Zhang, J. J. Schauer, R. Zhang |
| 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. 16 ; Nr. 13, no. 16 (2013-08-22), S.8303-8314 |
| Datensatznummer |
250085643
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| Publikation (Nr.) |
 copernicus.org/acp-13-8303-2013.pdf |
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| Zusammenfassung |
| To assess the primary and secondary sources of fine organic aerosols after
the aggressive implementation of air pollution controls during the 2008
Beijing Olympic Games, 12 h PM2.5 values were measured at an urban site at
Peking University (PKU) and an upwind rural site at Yufa during the
CAREBEIJING-2008 (Campaigns of Air quality REsearch in BEIJING and
surrounding region) summer field campaign. The average PM2.5
concentrations were 72.5 ± 43.6 μg m−3 and
64.3 ± 36.2 μg m−3 (average ± standard deviation, below as the same) at
PKU and Yufa, respectively, showing the lowest concentrations in recent
years. Combining the results from a CMB (chemical mass balance) model and
secondary organic aerosol (SOA) tracer-yield model, five primary and four
secondary fine organic aerosol sources were compared with the results from
previous studies in Beijing. The relative contribution of mobile sources to
PM2.5 concentrations was increased in 2008, with diesel engines
contributing 16.2 ± 5.9% and 14.5 ± 4.1% and gasoline
vehicles contributing 10.3 ± 8.7% and 7.9 ± 6.2% to organic
carbon (OC) at PKU and Yufa, respectively. Due to the implementation of
emission controls, the absolute OC concentrations from primary sources were
reduced during the Olympics, and the contributions from secondary formation
of OC represented a larger relative source of fine organic aerosols.
Compared with the non-controlled period prior to the Olympics, primary
vehicle contributions were reduced by 30% at the urban site and 24% at
the rural site. The reductions in coal combustion contributions were 57%
at PKU and 7% at Yufa. Our results demonstrate that the emission control
measures implemented in 2008 significantly alleviated the primary organic
particle pollution in and around Beijing. However, additional studies are
needed to provide a more comprehensive assessment of the emission control
effectiveness on SOA formation. |
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