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| Titel |
Variability of organic and elemental carbon, water soluble organic carbon, and isotopes in Hong Kong |
| VerfasserIn |
K. F. Ho, S. C. Lee, J. J. Cao, Y. S. Li, Judith C. Chow, J. G. Watson, K. Fung |
| 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 ; 6, no. 12 ; Nr. 6, no. 12 (2006-10-12), S.4569-4576 |
| Datensatznummer |
250004137
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| Publikation (Nr.) |
 copernicus.org/acp-6-4569-2006.pdf |
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| Zusammenfassung |
| To determine the levels and variations of carbonaceous aerosol in Hong Kong,
PM2.5 and PM10 samples were collected by high volume (Hi-vol)
samplers at three monitoring stations (representing middle-scale roadside,
urban-, and regional-scale environments) during winter (November 2000 to
February 2001) and summer (June 2001 to August 2001) periods. The highest
concentrations of organic carbon (OC), elemental carbon (EC), and
water-soluble organic carbon (WSOC) were found at the middle-scale roadside
site with the lowest at the regional-scale site. The percentages of WSOC in
total carbon at these sites were inversely correlated with their
concentrations (i.e., the highest percentages of WSOC were observed at the
regional-scale site). A high WSOC fraction may be associated with aged
aerosol because of the secondary formation by photochemical oxidation of
organic precursors of anthropogenic pollutants during transport. The annual
average of isotope abundances (δ13C) of OC and EC were –26.9±0.5‰ and –25.6±0.1‰, respectively. There were no notable
differences for seasonal distributions of carbon isotopic composition,
consistent with motor vehicle emissions being the main source contributors
of carbonaceous aerosol in Hong Kong. OC 13C abundances at the
regional-scale site were higher than those at the middle-scale roadside and
urban sites, consistent with secondary organic aerosols of biogenic origin. |
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