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| Titel |
A weekly heavy haze episode in Hangzhou city in December of 2013: Characteristics, origins and implications |
| VerfasserIn |
Shaocai Yu, Qingyu Zhang, Renchang Yan, Pengfei Li, Si Wang, Weiping Liu |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103426
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| Publikation (Nr.) |
 EGU/EGU2015-2837.pdf |
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| Zusammenfassung |
| Air pollution and heavy haze have recently become China’s biggest environmental problem
due to the rapid economic and industrial developments and urbanization. However, the
sources for the formation of the heavy haze for many cities remain unknown. Here, we
analyzed the characteristics of air pollution in metropolitan Hangzhou city (China) from
November 25 to December 11, 2013, on the basis of surface observations at 8 urban
monitoring stations for PM2.5, PM10, O3, NO2, CO and SO2 and satellite observations for
aerosol optical thickness. The sources for the formation of heavy haze were identified by
the analysis of trajectory clustering, the receptor models such as potential source
contribution function and concentration weighted trajectory. The results show that
for the weekly heavy haze episode (December 3 to 9), the mean concentrations of
PM2.5, PM10, SO2, NO2, and CO are 293.4±103.2, 376.8±119.4, 58.0±37.2,
118.5±39.3 and 2429±740 μg m-3, respectively. The back trajectory cluster analysis
indicates that the predominant clusters are south (37.1%) and southeast (28.6%)
during the weekly heavy haze episode at Hangzhou. The results of the receptor
models show that the sources affecting formation of the extremely high PM2.5
in Hangzhou are mainly located in the southeastern coast of Zhejiang and Fujian
provinces, north part of Jiangxi and central part of Jiangsu province. Rather than
local emissions, it is also found that air mass pathways and cross-border transports
are crucial factors for determining high PM2.5 concentrations and formation in
Hangzhou. The two-way coupled WRF-CMAQ model was also used to study the
formation of haze in Hangzhou. It is necessary to implement the air pollution control
measures for all industrial areas on local, regional, and even national scales in China. |
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