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Black carbon aerosols and their radiative properties in the Pearl River Delta region

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Abstract

The climatic and environmental effects of atmospheric aerosols are a hot topic in global science community, and radiative properties of the aerosols are one of the important parameters in assessing climatic change. Here we studied the black carbon concentration and absorption coefficient measured with aethalometers, scattering coefficient measured with nephelometers, and single scattering albedo derived at an atmospheric composition watch station in Guangzhou from 2004 to 2007. Our main results are as follows. The data of black carbon concentration and absorption coefficients measured with instruments cannot be directly used until they are measured in parallel with internationally accepted instruments for comparison, calibration, and reduction. After evaluation of the data, the result shows that the monthly mean of BC concentration varies 3.1–14.8 μg·m−3 and the concentration decreases by about 1 μg·m−3 in average over the four years; It is higher in the dry season with a multi-year mean of 8.9 μg/m3 and lower in the rainy season with a multi-year mean of 8.0 μg·m−3; The extreme maximum of monthly mean concentration occurred in December 2004 and extreme minimum in July 2007, and a 4-year mean is 8.4 μg·m−3. It is also shown that monthly mean scattering coefficient derived varies 129 −565 Mm−1, monthly mean absorption coefficient 32–139 Mm−1, and monthly mean single scattering albedo 0.71–0.91, with annual mean values of 0.80, 0.82, 0.79 and 0.84 for 2004, 2005, 2006 and 2007, respectively. Three instruments were used to take simultaneous measurements of BC in PM10, PM2.5, and PM1 and the results showed that PM2.5 took up about 90% of PM10 and PM1 accounted for about 68% of PM2.5, and BC aerosols are mainly present in fine particulates. The variability of BC concentrations is quite consistent between the Nancun station (141 m above sea level) and the Panyu station (13 m above sea level), which are 8 km apart from each other. The concentration in higher altitude station (Panyu) is consistently lower than the lower altitude station (Nancun), and the difference of annual mean is about 4 μg·m−3.

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Authors and Affiliations

  1. Institute of Tropical and Marine Meteorology, China Meteorological Adiministration, Guangzhou, 510080, China

    Dui Wu, XueJiao Deng, Fei Li, HaoBo Tan, XueYan Bi & Tao Deng

  2. Department of Atmospheric Science, School of Physics, Peking University, Beijing, 100871, China

    JieTai Mao

  3. National Center for Atmospheric Research, Boulder, CO, 80303, USA

    XueXi Tie

  4. School of Environmental Science, Peking University, Beijing, 100871, China

    YuanHang Zhang & LiMin Zeng

  5. Guangdong Meteorological Observatory, Guangzhou, 510080, China

    XiaoYing Huang

  6. Department of Atmospheric Science, School of Environmental Science and Engineer, Sun Yat-sen University, Guangzhou, 510275, China

    Jing Chen

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  1. Dui Wu
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Correspondence to Dui Wu.

Additional information

Supported by Natural Science Foundation of China (Grant Nos. U0733004, 40375002, 40418008, 40775011), National High Technology R & D Program of China (Grant Nos. 2006AA06A306 and 2006AA06A308) and National Basic Research Program of China (Grant No. 2005CB422207)

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Wu, D., Mao, J., Deng, X. et al. Black carbon aerosols and their radiative properties in the Pearl River Delta region. Sci. China Ser. D-Earth Sci. 52, 1152–1163 (2009). https://doi.org/10.1007/s11430-009-0115-y

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  • DOI: https://doi.org/10.1007/s11430-009-0115-y

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