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| Titel |
Emission controls versus meteorological conditions in determining aerosol concentrations in Beijing during the 2008 Olympic Games |
| VerfasserIn |
Y. Gao, X. Liu, C. Zhao, M. 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 ; 11, no. 23 ; Nr. 11, no. 23 (2011-12-12), S.12437-12451 |
| Datensatznummer |
250010258
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| Publikation (Nr.) |
 copernicus.org/acp-11-12437-2011.pdf |
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| Zusammenfassung |
| A series of emission control measures were undertaken in Beijing and the
adjacent provinces in China during the 2008 Beijing Olympic Games on 8–24
August 2008. This provides a unique opportunity for investigating the
effectiveness of emission controls on air pollution in Beijing. We conducted
a series of numerical experiments over East Asia for the period of July to
September 2008 using a coupled meteorology-chemistry model (WRF-Chem). Model
can generally reproduce the observed variation of aerosol concentrations.
Consistent with observations, modeled concentrations of aerosol species
(sulfate, nitrate, ammonium, black carbon, organic carbon, total particulate
matter) in Beijing were decreased by 30–50% during the Olympic period
compared to the other periods in July and August in 2008 and the same period
in 2007. Model results indicate that emission controls were effective in
reducing the aerosol concentrations by comparing simulations with and
without emission controls. In addition to emission controls, our analysis
suggests that meteorological conditions (e.g. wind direction and
precipitation) were also important in producing the low aerosol
concentrations appearing during the Olympic period. Transport from the
regions surrounding Beijing determined the daily variation of aerosol
concentrations in Beijing. Based on the budget analysis, we suggest that to
improve the air quality over Beijing, emission control strategy should focus
on the regional scale instead of the local scale. |
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