Atmospheric aerosol compositions in China: spatial/temporal variability, chemical signature, regional haze distribution and comparisons with global aerosols
Author:
Zhang X. Y.,Wang Y. Q.,Niu T.,Zhang X. C.,Gong S. L.,Zhang Y. M.,Sun J. Y.
Abstract
Abstract. During 2006 and 2007, the daily concentrations of major water-soluble constituents, mineral aerosol, organic carbon (OC) and elemental carbon (EC) in ambient PM10 samples were investigated from 16 urban, rural and remote sites in various regions of China, and were compared with global aerosol. A large difference between urban and rural chemical species was found, normally with 1.5 to 2.5 factors higher in urban than in rural sites. Optically-scattering aerosols such as sulfate (~16%), OC (~15%), nitrate (~7%) and ammonium (~5%) consist of ~50% of the total aerosols with another ~35% from mineral aerosol also having a certain degree of scattering ability, indicating a dominant scattering feature of aerosols in China. Of the total OC, ~55%–60% can be attributed to the secondary organic carbon (SOC). The absorbing aerosol EC accounts for ~3.5% of the total PM10. Seasonally, maximum concentrations of most aerosol species are found in winter while mineral aerosol also peaks in spring. Second peaks were found for sulfate and ammonium in summer and for OC and EC in May and June. This can be considered as a typical seasonal pattern in various aerosol components in China. Aerosol acidity is normally neutral in most of urban areas, but becomes somewhat acidic in rural areas. Based on the surface visibility from 681 meteorological stations in China during 1957–2005, four major haze areas are also identified with similar visibility changes, namely, (1) Hua Bei Plain in N. China, plus the Guanzhong Plain; (2) E. China with the main body in the Yangtze River Delta area; (3) S. China with most areas of Guangdong and the Pearl River Delta area; (4) The Si Chuan Basin in S. W. China. The degradation of visibility in these areas is linked with the emission changes and high PM concentrations. Such quantitative chemical characterization of aerosols is essential in assessing their role in atmospheric chemistry and weather-climate effects, and in validating atmospheric models.
Publisher
Copernicus GmbH
Reference91 articles.
1. Bond, T. C., Streets, D. G., Yarber, K. F., Nelson, S. M., and Woo, J.: A technology-based global inventory of black and organic carbon emissions from combustion, J. Geophys. Res., 109, 1–43, 2004. 2. Cao, G., Zhang, X., and Zheng, F.: Inventory of black carbon and organic carbon emissions from china, Atmos. Environ., 40, 6516–6527, 2006. 3. Cao, G. L., An, X. Q., Zhou, C. H., Ren, Y. Q., and Tu, J.: Emission inventory of air pollutants in china, China Environmental Science, 30, 900–906, 2010. 4. Castro, L. M., Pio, C. A., Harrison, R. M., and Smith, D. J. T.: Carbonaceous aerosol in urban and rural european atmospheres: Estimation of secondary organic carbon concentrations, Atmos. Environ., 33, 2771–2781, 1999. 5. Chakraborty, A. and T. Gupta: Chemical Characterization and Source Apportionment of Submicron (PM1) Aerosol in Kanpur Region, India, Aerosol Air Qual. Res., 10, 433–445, 2010
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