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| Titel |
Using a mobile laboratory to characterize the distribution and transport of sulfur dioxide in and around Beijing |
| VerfasserIn |
M. Wang, T. Zhu, J. P. Zhang, Q. H. Zhang, W. W. Lin, Y. Li, Z. F. Wang |
| 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. 22 ; Nr. 11, no. 22 (2011-11-22), S.11631-11645 |
| Datensatznummer |
250010210
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| Publikation (Nr.) |
 copernicus.org/acp-11-11631-2011.pdf |
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| Zusammenfassung |
| Megacities are places with intensive human activity and energy consumption.
To reduce air pollution, many megacities have relocated energy supplies and
polluted industries to their outer regions. However, regional transport then
becomes an important source of air pollution in megacities. To improve air
quality before and during the 2008 Beijing Olympics, a wide range of control
strategies were implemented, including the relocation of polluting
industries. High sulfur dioxide (SO2) concentrations were occasionally
observed during this period. Potential sources from southern regions of
Beijing were indicated by backward trajectories model and urban/rural
stationary measurements, but direct evidence was lacking. Here we used a
mobile laboratory to characterize the spatial distribution and regional
transport of SO2 to Beijing during the Campaign for Air Quality
Research in Beijing and the Surrounding Region (CAREBEIJING)-2008. Among the
five days chosen for the case studies during the Olympic air pollution
control period, four had high SO2 concentrations (6, 20 August and 3, 4
September 2008) while one had low SO2 concentration (11 September
2008). The average values of SO2 during the low SO2 concentration
day were 3.9 ppb, much lower than during the high concentration days (7.8
ppb). This result implied an impact by regional transport from outside
Beijing. During these days, we captured transport events of SO2 from
areas south of Beijing, with a clear decrease in SO2 concentrations
southeast of the 6th to 4th Ring Roads around Beijing and along
the 140 km highway from Tianjin to Beijing. The influx of SO2 through
the 4th to 6th Ring Roads ranged from 2.1 to 4.6 kg s−1 on 4
September and 0.2 to 1.6 kg s−1 on 20 August 2008. The differences of influx
in days were due to the variations of emission changes, transport directions
and dilutions. Locally emitted SO2 from a source located along Jingshi
Highway outside the southwest section of the 5th Ring Road of Beijing
was identified using wind field data generated by the Weather Research and
Forecasting model and the measured particle size distribution, with an
estimated flux of 0.1 kg s−1 to Beijing. Estimated uncertainties for
SO2 influx were approximately 31%. |
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