Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6997
Title: Variability of organic and elemental carbon, water soluble organic carbon, and isotopes in Hong Kong
Authors: Ho, KF
Lee, SC 
Cao, JJ
Li, YS 
Chow, JC
Watson, JG
Fung, K
Keywords: Aerosol composition
Air sampling
Anthropogenic source
Inorganic carbon
Organic carbon
Photooxidation
Pollutant
Issue Date: 12-Oct-2006
Publisher: Copernicus GmbH
Source: Atmospheric chemistry and physics, 12 Oct. 2006, v. 6, no. 12, p. 4569-4576 How to cite?
Journal: Atmospheric chemistry and physics 
Abstract: To determine the levels and variations of carbonaceous aerosol in Hong Kong, PM ₂.₅ 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.
URI: http://hdl.handle.net/10397/6997
ISSN: 1680-7316
EISSN: 1680-7324
DOI: 10.5194/acp-6-4569-2006
Rights: © Author(s) 2006. This work is licensed under a Creative Commons License.
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