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首页> 外文期刊>颗粒学报（英文版） >ANALYSIS OF COLUMN-INTEGRATED AEROSOL OPTICAL THICKNESS IN BEIJING FROM AERONET OBSERVATIONS
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ANALYSIS OF COLUMN-INTEGRATED AEROSOL OPTICAL THICKNESS IN BEIJING FROM AERONET OBSERVATIONS

机译：气溶胶观测法分析北京地区气溶胶光学厚度

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机译：Aerosol Optical Thickness (AOT), water vapor content and derived Angstrom exponent acquired by a ClMEL sun photometer in Beijing are analyzed. Monthly means computed from quality-assured daily means, seasonal trends and inter-annual variations are presented and discussed. Summer has the highest seasonal average AOT at 440 nm (τa440), Angstrom exponent (α440-870) and water vapor content with the values 0.93, 1.34 and 3.0 cm, respectively.The second highest seasonal average τa440 appears in spring with the largest variation of α440-870 and minimum α440-8700.99 due to the impact of coarse particles. The minimum seasonal average τa440 (0.44) and water vapor content (0.4 cm)appear in winter. The annual average τa440, α440-870 and water vapor content for about 4-year observation period are 0.70,1.19 and 1.4 cm, respectively. All monthly average Angstrom exponents are within 0.8-1.4, which indicates aerosol inBeijing is a very complex mixture of both fine- and coarse-mode particles (from anthropogenic influence and naturalmineral dust).

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