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| Titel |
The characteristics and origins of carbonaceous aerosol at a rural site of PRD in summer of 2006 |
| VerfasserIn |
W. W. Hu, M. Hu, Z. Q. Deng, R. Xiao, Y. Kondo, N. Takegawa, Y. J. Zhao, S. Guo, Y. H. Zhang |
| 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 ; 12, no. 4 ; Nr. 12, no. 4 (2012-02-17), S.1811-1822 |
| Datensatznummer |
250010725
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| Publikation (Nr.) |
 copernicus.org/acp-12-1811-2012.pdf |
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| Zusammenfassung |
| Both organic carbon (OC) and elemental carbon (EC) were measured during
PRIDE-PRD 2006 summer campaign by using a semi-continuous thermal-optical
carbon analyzer at a rural site, Back Garden (BG), which is located 50 km to
the northwest of Guangzhou City. Together with the online EC/OC analyzer,
various kinds of instruments related to aerosol chemical properties were
employed here, which provided a good opportunity to check data quality. The
concentrations of OC correlated well with the mass of organic matter (OM)
and water soluble organic carbon (WSOC), implying the reliability of the
data measured in this campaign. The average OC concentrations in fine
particle for three typical periods during the campaign (local emission
influence, typhoon and precipitation and normal days) were
28.1 μgC m−3, 4.0 μgC m−3
and 5.7 μgC m−3, respectively;
and EC were 11.6 μgC m−3, 1.8 μgC m−3, and
3.3 μgC m−3, respectively. The diurnal patterns of EC and OC during the campaign
were higher at night and in early morning than daytime, which was probably
caused by the primary emission and accumulation in the occurrence of low
boundary layer. Compared with the constant diurnal enhancement ratios of EC,
the enhancement ratio of OC (OC versus (CO-CObackground)) kept in a
relative high level in the afternoon, with a similar diurnal profile to
oxygenated organic aerosol (OOA), due to the strong photochemical formation
of OC. Here, a modified EC tracer method was used to estimate the formation
of secondary organic carbon (SOC). These results showed that the average SOC
concentration (normal days) at BG site was about 2.0 ± 2.3 μgC m−3,
and the SOC fraction in OC could reach up to 80% with the
average of 47%. The modified approach in this study proved to be
effective and reliable for SOC estimation based on good correlations between
estimated SOC versus OOA or WSOC, and estimated POC versus hydrocarbon-like
organic aerosol (HOA). |
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