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| Titel |
One-year record of organic and elemental carbon in fine particles in downtown Beijing and Shanghai |
| VerfasserIn |
F. Yang, K. He, B. Ye, X. Chen, L. Cha, S. H. Cadle, T. Chan, P. A. Mulawa |
| 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 ; 5, no. 6 ; Nr. 5, no. 6 (2005-06-15), S.1449-1457 |
| Datensatznummer |
250002896
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| Publikation (Nr.) |
 copernicus.org/acp-5-1449-2005.pdf |
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| Zusammenfassung |
| Weekly PM2.5 samples were collected for one year (1999-2000) in Beijing
and Shanghai and the carbonaceous species analyzed to investigate and
compare their time series patterns and possible sources in the two biggest
cities of China. Weekly carbonaceous concentrations varied in wide ranges
with 8.6-59µg m-3 for OC and 1.5-25.4µg m-3 for EC in
Beijing, and with 5.1-38.4µg m-3 for OC and 2.3-13.0µg m-3
for EC in Shanghai. Similar weekly and seasonal variations of OC
and EC concentrations were found in each city though major combustion
sources presented source-dependent emission characteristics and seasonal
differences in emission amount for carbonaceous species. Both OC and EC
maintained much higher concentrations in late fall through winter, probably
due to enhanced emissions coupled with unfavorable meteorological
conditions. In Beijing, the 14C analysis of limited samples suggested
there was a significant contribution (33-48%) of modern carbon to the
total fine carbonaceous PM burden with higher fractions in the harvest
seasons. The high mass ratios of excessive potassium to EC in both Beijing
and Shanghai also indicated that biomass burning had important contribution
to fine carbonaceous particles. |
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