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| Titel |
Analysis of a winter regional haze event and its formation mechanism in the North China Plain |
| VerfasserIn |
X. J. Zhao, P. S. Zhao, J. Xu, , W. Meng, W. W. Pu, F. Dong, D. He, Q. F. Shi |
| 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. 11 ; Nr. 13, no. 11 (2013-06-13), S.5685-5696 |
| Datensatznummer |
250018698
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| Publikation (Nr.) |
 copernicus.org/acp-13-5685-2013.pdf |
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| Zusammenfassung |
| A regional haze episode occurred in the Beijing, Tianjin and Hebei province
(BTH) area in the North China Plain (NCP) from 16 to 19 January 2010. Data
were collected and analyzed during the time frame of 14 through 23 January
2010 to include the haze event. The increase of secondary inorganic
pollutants (SO42−, NO3−, NH4+) in PM2.5
was observed simultaneously at four sites, especially in the plain area of
the BTH, which could be identified as a common characteristic of pollution haze
in east China. The sulfate and nitrate in PM2.5 were mainly formed
through the heterogeneous reaction process in the urban area. The organic
matter (OM) increased more significantly at the Chengde (CD) site than the other
three sites in the plain area. The secondary organic aerosols only existed
during haze days at CD but in both haze and non-haze days at the other three
sites, which suggested the greater regional impact of secondary formation
process during the haze episode. The secondary formation of aerosol was one
important formation mechanism of haze. The strong temperature inversion and
descending air motions in the planetary boundary layer (PBL) allowed
pollutants to accumulate in a shallow layer. The weak surface wind speed
produced high pollutants concentration within source regions. The
accumulation of pollutants was one main factor in the haze formation. The
enhanced southwest wind in the last period of this episode transported
pollutants to the downwind area and expanded the regional scope of the haze. |
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