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Determination of Ångström coefficients from spectral aerosol optical depth at two sites in Egypt

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  • Tadros, M.T.Y.
  • El-Metwally, M.
  • Hamed, A.B.

Abstract

Ångström Turbidity Coefficients (ÅTC) are estimated from Aerosol Optical Depth by using spectral broadband data. These data are carried out from Pyrheliometric measurements in the period 1991–96 for two sites of different climatological and environmental view; the first one is a highly polluted urbanized site (Cairo), while the other is an unpolluted arid site (Aswan). SMARTS2 model proposed by Gueymard and SPCTRAL2 model proposed by Bird and Riordan, with two pairs of spectral broadbands, are used to select the suitable spectral broadband for estimating ÅTC. The turbidity levels increase during the two transition seasons, spring (due to Khamasin depressions coming from Great Sahara) and autumn (due to extend of Sudan monsoon trough), in addition to summer season. The subsidence inversion is stronger and leads to trap the pollution in the boundary layer in summer. The mean average values of ÅTC, over the all period, are α=0.477, 0.817 and β=0.283, 0.144 for Cairo and Aswan respectively. Turbidity level in Cairo is higher than that in Aswan because the two big industrial areas Helwan and Shoubra El-Kheima surround Cairo, in addition to traffic.

Suggested Citation

  • Tadros, M.T.Y. & El-Metwally, M. & Hamed, A.B., 2002. "Determination of Ångström coefficients from spectral aerosol optical depth at two sites in Egypt," Renewable Energy, Elsevier, vol. 27(4), pages 621-645.
    • Handle: RePEc:eee:renene:v:27:y:2002:i:4:p:621-645
    DOI: 10.1016/S0960-1481(01)00156-2
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    References listed on IDEAS

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    1. Mosalam Shaltout, M.A. & Tadros, M.T.Y. & El-Metwally, M., 2000. "Studying the extinction coefficient due to aerosol particles at different spectral bands in some regions at great Cairo," Renewable Energy, Elsevier, vol. 19(4), pages 597-615.
    2. Cucumo, M. & Marinelli, V. & Oliveti, G., 1999. "Data bank Experimental data of the Linke Turbidity factor and estimates of the Ångström turbidity coefficient for two Italian localities," Renewable Energy, Elsevier, vol. 17(3), pages 397-410.
    3. Tadros, M.T.Y. & Madkour, M. & Elmetwally, M., 1999. "Size distribution of aerosol particles: comparison between agricultural and industrial areas in Egypt," Renewable Energy, Elsevier, vol. 17(3), pages 339-354.
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    1. Janjai, S. & Kumharn, W. & Laksanaboonsong, J., 2003. "Determination of Angstrom’s turbidity coefficient over Thailand," Renewable Energy, Elsevier, vol. 28(11), pages 1685-1700.
    2. Madkour, M.A. & El-Metwally, M. & Hamed, A.B., 2006. "Comparative study on different models for estimation of direct normal irradiance (DNI) over Egypt atmosphere," Renewable Energy, Elsevier, vol. 31(3), pages 361-382.
    3. Khalil, Samy A. & Shaffie, A.M., 2016. "Attenuation of the solar energy by aerosol particles: A review and case study," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 363-375.
    4. Eltbaakh, Yousef A. & Ruslan, M.H. & Alghoul, M.A. & Othman, M.Y. & Sopian, K. & Razykov, T.M., 2012. "Solar attenuation by aerosols: An overview," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(6), pages 4264-4276.
    5. Gueymard, Christian A., 2005. "Interdisciplinary applications of a versatile spectral solar irradiance model: A review," Energy, Elsevier, vol. 30(9), pages 1551-1576.
    6. Khalil, Samy A. & Shaffie, A.M., 2016. "Evaluation of transposition models of solar irradiance over Egypt," Renewable and Sustainable Energy Reviews, Elsevier, vol. 66(C), pages 105-119.

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