Publications (3)7.81 Total impact
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Article: Emission and Transport of Carbonaceous Aerosols in Urbanized Coastal Areas in China
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ABSTRACT: Elemental and organic carbon (EC and OC), the principal short-lived climate forcers, were measured in fine particulate matter (PM 2.5) collected at urban and rural sites in continental edge in Southern China. The carbonaceous matter (CM) contributed an average of 28.5 ± 7.2% (1 SD) of the mass of PM 2.5 in urban areas and 30.3 ± 8.2% in rural areas. The annual average OC concentrations in PM 2.5 in urban and rural areas were 7.6 ± 4.3 and 5.7 ± 3.1 μg/m 3 , respectively; and the annual average EC concentrations were 2.4 ± 0.8 and 1.3 ± 0.7 μg/m 3 , respectively. The higher EC concentration in urban area than in rural area showed significant anthropogenic emissions to the urban atmosphere. EC and OC concentrations displayed good correlation in samples collected in urban area during winter monsoon season, suggesting a dominant emission source (mostly traffic-related) in urban area. The carbonaceous aerosol pollution in the rural coastal receptor area can be attributed to the local emission and transport of air pollutants from urbanized areas in the eastern part of China. The surface observation together with backward trajectory analysis, satellite imaging, and meteorological simulation indicate that air pollutants transported from emission hotspots in the urbanized Eastern China area had caused an increase in the concentration of carbonaceous aerosols in the rural continental edge by a factor of 2–3. This significant aerosol forcing of the Chinese outflow plume should be paid attention in the study of air quality and climate changes in Eastern/Southern Asia.Aerosol and Air Quality Research 01/2012; · 2.83 Impact Factor -
Article: Particulate air pollution from combustion and construction in coastal and urban areas of China.
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ABSTRACT: In China, the areas that are undergoing rapid urban growth are faced with increasingly more complicated air pollution problems. Sources of air pollution need to be identified and their contributions quantified. In this study, PM2.5 (particulate matter with aerodynamic diameters < or =2.5 microm), PM2.5-10 (particulate matter with aerodynamic diameters 2.5-10 microm), organic carbon (OC), and elemental carbon (EC) concentrations were measured from April to July 2009 at four selected areas in Xiamen (the downtown area, an industrial park, a suburb, and one remote site). The contributions of carbonaceous aerosols to PM2.5 and PM2.5-10 were 20-30% and 10-20%, respectively, indicating that finer particles contained more carbonaceous aerosols. The EC concentrations in PM2.5 at the downtown, industrial, suburb, and remote sites were 2.16 +/- 0.61, 2.05 +/- 0.45, 1.69 +/- 0.54, and 0.65 +/- 0.43 microg m-3, respectively, showing a decrease from the urban and industrial hotspots to the surrounding areas. These data show that carbonaceous aerosols emitted from the combustion of fossil fuels in urban and industrial hotspots influence air quality at the regional scale. Higher levels of PM2.5 and PM2.5-10 were observed at the suburb site compared to the urban and industrial sites. Peak EC concentrations in PM2.5 were observed during the morning and evening rush hours. However, peak PM2.5 levels at the suburb site were observed around noon, which coincides with construction work hours, instead of the morning and evening rush hours when emissions from combustion dominated. These findings indicate that both fuel combustion and construction have exacerbated air pollution in coastal and urban areas in China.Journal of the Air & Waste Management Association (1995) 11/2011; 61(11):1160-5. · 1.52 Impact Factor -
Article: Digital photographic method to quantify black carbon in ambient aerosols
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ABSTRACT: A digital photography based method, Digital Optical Method for Black Carbon (DOM-BC), was developed to quantify the concentration of aerosol black carbon (BC). In this method, a measured volume of ambient air passed through an aerosol sampler, and the aerosol particles were collected onto a quartz fiber filter. Digital pictures of the filter were taken, and then analyzed to determine the optical attenuation (ATN) of the particle layer on the filter. The ATN was related to the mass loading of BC, in mg BC per cm 2 of filter area, by performing calibration against thermaleoptical analysis (TOA). The average aerosol BC concentration was then calculated with known BC loading, sampling time, and filter area. Method calibration was carried out using one set of samples collected in Xiamen. The results showed that the BC loading was linearly related to the ATN of the particle layer when the ATN was lower than 150. When the ATN increased beyond 200, an exponential correlation was observed. This method was validated by analyzing the samples collected in Xiamen from 06/2009 to 01/2011. For all the samples taken in Xiamen, the average relative error was <10.7% when comparing with the TOA measurements. DOM-BC was further evaluated by conducting statistical tests. Uncertainty analysis indicated an overall uncertainty of 7% for this method.Atmospheric Environment 01/2011; · 3.46 Impact Factor
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2011
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Chinese Academy of Sciences
- Institute of Urban Environment
Beijing, Beijing Shi, China
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