 |
| Titel |
Atmospheric aerosol compositions in China: spatial/temporal variability, chemical signature, regional haze distribution and comparisons with global aerosols |
| VerfasserIn |
X. Y. Zhang, Y. Q. Wang, T. Niu, X. C. Zhang, S. L. Gong, Y. M. Zhang, J. Y. Sun |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 2 ; Nr. 12, no. 2 (2012-01-17), S.779-799 |
| Datensatznummer |
250010530
|
| Publikation (Nr.) |
 copernicus.org/acp-12-779-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| From 2006 to 2007, the daily concentrations of major inorganic water-soluble
constituents, mineral aerosol, organic carbon (OC) and elemental carbon (EC)
in ambient PM10 samples were investigated from 16 urban, rural and remote
sites in various regions of China, and were compared with global aerosol
measurements. A large difference between urban and rural chemical species
was found, normally with 1.5 to 2.5 factors higher in urban than in rural
sites. Optically-scattering aerosols, such as sulfate (~16%), OC
(~15%), nitrate (~7%), ammonium (~5%) and mineral
aerosol (~35%) in most circumstance, are majorities of the total
aerosols, indicating a dominant scattering feature of aerosols in China. Of
the total OC, ~55%–60% can be attributed to the formation of
the secondary organic carbon (SOC). The absorbing aerosol EC only accounts
for ~3.5% of the total PM10. Seasonally, maximum concentrations of
most aerosol species were found in winter while mineral aerosol peaks in
spring. In addition to the regular seasonal maximum, secondary peaks were
found for sulfate and ammonium in summer and for OC and EC in May and June.
This can be considered as a typical seasonal pattern in various aerosol
components in China. Aerosol acidity was normally neutral in most of urban
areas, but becomes some acidic in rural areas. Based on the surface
visibility observations from 681 meteorological stations in China between
1957 and 2005, four major haze areas are identified with similar visibility
changes, namely, (1) Hua Bei Plain in N. China, and the Guanzhong Plain; (2)
E. China with the main body in the Yangtze River Delta area; (3) S. China
with most areas of Guangdong and the Pearl River Delta area; (4) The Si Chuan
Basin in S.W. China. The degradation of visibility in these areas is linked
with the emission changes and high PM concentrations. Such quantitative
chemical characterization of aerosols is essential in assessing their role
in atmospheric chemistry and weather-climate effects, and in validating
atmospheric models. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|