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| Titel |
Formation and evolution mechanism of regional haze: a case study in the megacity Beijing, China |
| VerfasserIn |
X. G. Liu, J. Li, Y. Qu, T. Han, L. Hou, J. Gu, C. Chen, Y. Yang, X. Liu, T. Yang, Y. Zhang, H. Tian, M. Hu |
| 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. 9 ; Nr. 13, no. 9 (2013-05-02), S.4501-4514 |
| Datensatznummer |
250018622
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| Publikation (Nr.) |
 copernicus.org/acp-13-4501-2013.pdf |
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| Zusammenfassung |
| The main objective of this study is to investigate the formation and
evolution mechanism of the regional haze in megacity Beijing by analyzing the
process of a severe haze that occurred 20–27 September 2011. Mass
concentration and size distribution of aerosol particles as well as aerosol
optical properties were concurrently measured at the Beijing urban
atmospheric environment monitoring station. Gaseous pollutants (SO2,
NO-NO2-NOx, O3, CO) and meteorological parameters (wind
speed, wind direction, and relative humidity) were simultaneously monitored.
Meanwhile, aerosol spatial distribution and the height of planetary boundary
layer (PBL) were retrieved from the signal of satellite and LIDAR (light
detection and ranging). Concentrations of NO, NO2, SO2, O3,
and CO observed during 23–27 September had exceeded the national ambient air
quality standards for residents. The mass concentration of PM2.5
gradually accumulated during the measurement and reached at
220 μg m−3 on 26 September, and the corresponding atmospheric
visibility was only 1.1 km. The daily averaged AOD in Beijing increased from
~ 0.16 at λ = 500 nm on 22 September and reached ~ 3.5
on 26 September. The key factors that affected the formation and evolution of
this haze episode were stable anti-cyclone synoptic conditions at the
surface, decreasing of the height of PBL, heavy pollution emissions from
urban area, number and size evolution of aerosols, and hygroscopic growth for
aerosol scattering. This case study may provide valuable information for the
public to recognize the formation mechanism of the regional haze event over
the megacity, which is also useful for the government to adopt scientific
approach to forecast and eliminate the occurrence of regional haze in China. |
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