Analysis of column-integrated aerosol optical thickness in beijing from aeronet observations--颗粒学报PARTICUOLOGY

Fan, X., Chen, H., Goloub, P., Xia, X. a., Zhang, W., & Chatenet, B. (2006). Analysis of column-integrated aerosol optical thickness in beijing from aeronet observations. China Particuology, 4(6), 330-335. https://doi.org/10.1016/S1672-2515(07)60285-1

Analysis of column-integrated aerosol optical thickness in beijing from aeronet observations

Xuehua Fan ^{a b *}, Hongbin Chen ^a, Philippe Goloub ^c, Xiang'ao Xia ^a, Wenxing Zhang ^a, Bernadette Chatenet ^d

a LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
b The Graduate School, Chinese Academy of Sciences, Beijing, China
c Laboratoire d'Optique Atmosphérique, Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, France
d Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), Université Paris, Creteil, France

10.1016/S1672-2515(07)60285-1

Volume 4, Issue 6, December 2006, Pages 330-335

Received 12 April 2006, Accepted 16 October 2006, Available online 14 December 2007.

E-mail: fxh@mail.iap.ac.cn

Highlights

Abstract

Aerosol Optical Thickness (AOT), water vapor content and derived Angstrom exponent acquired by a CIMEL 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 (τ_a440), Angstrom exponent (α_440–870) 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 α_440–870 and minimum α_440–870 0.99 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 τ_a440, α_440–870 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 in Beijing is a very complex mixture of both fine- and coarse-mode particles (from anthropogenic influence and natural mineral dust).

Graphical abstract

Keywords

AERONET; AOT; angstrom exponent; water vapor content

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