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Size distributions of elemental carbon and its contribution to light extinction in urban and rural locations in the pearl river delta region, China

Authors Yu, Huan HKUST affiliated (currently or previously)
Wu, Cheng HKUST affiliated (currently or previously)
Wu, Dui
Yu, Jianzhen View this author's profile
Issue Date 2010
Source Atmospheric chemistry and physics , v. 10, (11), 2010, June, p. 5107-5119
Summary 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 mu m range and a slightly less abundant mode in the droplet mode size (MMAD: 0.8-1.1 mu m), while the suburban/rural EC had a prominent mode in the droplet mode size (MMAD: 0.7-1.1 mu m) and a minor condensation mode (MMAD: 0.22-0.33 mu m). 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.
ISSN 1680-7316
Rights Published by Copernicus Publications on behalf of the European Geosciences Union.
Language English
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