Atmos. Chem. Phys. Discuss., 9, 11413-11440, 2009
www.atmos-chem-phys-discuss.net/9/11413/2009/
doi:10.5194/acpd-9-11413-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
An intensive study of aerosol optical properties in Beijing urban area
X. He1, C. Li1, A. K. H. Lau2, Z. Deng1, J. Mao1, M. Wang1, and X. Liu1
1Dept. of Atmospheric Sciences, School of Physics, Peking University (PKU), Beijing, China
2ENVF/IENV, The Hong Kong University of Science and Technology (HKUST), Hong Kong

Abstract. In order to quantify the aerosol impact on climate, a range of aerosol parameters is required. In this paper, two-year ground-based observations of aerosol optical properties are conducted at an urban site in Beijing of China. Aerosol absorption coefficient (σa) and scattering coefficient (σs), as well as single scattering albedo (ω) are analyzed for characterizing Beijing urban aerosol. Two-year averages (and standard deviations) for σa, σs and ω are 56±49 Mm−1, 288±281 Mm−1 and 0.80±0.09, respectively. Meanwhile, there is a distinct diurnal variation for σa, with its minimum occurs about 14:00 to 15:00 and maximum in the evening. While, σs peaks in late morning and the minimum occurs in the evening. σs in summer is higher than that in winter. ω in summer is higher than that in winter except before 07:00 a.m. and it peaks in the early afternoon. Both σa and σs show strong dependence on local wind in four seasons. When the wind blows from north with low speed (0–4 m/s), both σa and σs are high, while very low with wind speed higher than 4 m/s. When the wind blows from south with low speed (0–4 m/s), σa and σs are intermediate. ω also shows wind dependence to some extent though not as strong as σa and σs.

Citation: He, X., Li, C., Lau, A. K. H., Deng, Z., Mao, J., Wang, M., and Liu, X.: An intensive study of aerosol optical properties in Beijing urban area, Atmos. Chem. Phys. Discuss., 9, 11413-11440, doi:10.5194/acpd-9-11413-2009, 2009.
 
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