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| Titel |
Size distributions of elemental carbon and its contribution to light extinction in urban and rural locations in the pearl river delta region, China |
| VerfasserIn |
H. Yu, C. Wu, D. Wu, J. Z. Yu |
| 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 ; 10, no. 11 ; Nr. 10, no. 11 (2010-06-08), S.5107-5119 |
| Datensatznummer |
250008517
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| Publikation (Nr.) |
 copernicus.org/acp-10-5107-2010.pdf |
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| Zusammenfassung |
| Elemental carbon (EC) in size-segregated aerosol samples were determined at
five urban, one suburban, and one rural locations in the Pearl River Delta
region in South China during 2006–2008 period. The size modal
characteristics of EC were different at the urban and suburban/rural
locations. The urban EC had a dominant condensation mode with a mass median
aerodynamic diameter (MMAD) in the 0.36–0.43 μm range and a
slightly less abundant mode in the droplet mode size (MMAD:
0.8–1.1 μm), while the suburban/rural EC had a prominent mode in
the droplet mode size (MMAD: 0.7–1.1 μm) and a minor condensation
mode (MMAD: 0.22–0.33 μm). Calculations using Mie theory and the
measured size distributions of EC, organic carbon, and major inorganic ions
indicate that EC-containing particles contributed 76±20% of the
observed light extinction at the urban sites. Among the EC-containing
particles, EC mass alone contributed 21±11% of the observed light
extinction while non-EC materials on the EC particles (i.e., organic matter,
ammonium sulfate, and water) contributed 55±15%. At the
suburban/rural locations, EC-containing particles contributed 37–48% of
the measured light extinction, with EC mass contributing 4–10% and non-EC
coating materials contributing the remaining light extinction. Our results
suggest that EC-containing particles were important to the overall light
extinction in the urban atmospheres due to their more abundant presence from
vehicular emissions. The EC-containing particles in the suburban/rural
locations had a reduced but still significant contribution to light
extinction budget. |
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