On the optical properties of the polluted Athens atmosphere,during May 1995 |
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| Institution: | 1. Department of Chemical Engineering, Aristotle University of Thessaloniki, University Campus, Thessaloniki, 54124, Greece;2. Department of Applied Informatics, School of Information Sciences, University of Macedonia, 156 Egnatia Str., Thessaloniki 54636, Greece;1. Department of Physics, Blackett Laboratory, Imperial College London, London SW7 2AZ, UK;2. Grantham Institute – Climate Change and the Environment, Imperial College London, London SW2 7AZ, UK;3. Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK;4. Oorja: Empowering Rural Communities, 201 Diamond Arch, St John Baptist Road, Bandra(W), Mumbai 400050, India;5. Université Pierre et Marie Curie, Paris 75005, France;6. Ecole Centrale Paris, Grande Voie des Vignes, 922595 Châtenay-Malabry, France |
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| Abstract: | Using ground-based spectral solar extinction data taken over the Athens atmosphere, reduced (total minus Rayleigh) and aerosol (Angstrom) spectral optical depths of the atmosphere, have been retrieved, under different polluted conditions. The results suggest that the optical depth, on days with relatively low pollution, exhibits slight variation with wavelength denoting that aerosols deplete all wavelengths almost equally. In contrast, under dense pollution, small particles scattering and trace gases absorption, are the dominant processes, resulting in steeper optical depth’s slopes, mainly in the ultraviolet domain. The Angstrom’s parameters β and α were determined through a least-squares fitting method. The turbidity β coefficient always shows a temporal pattern with high values in the morning and afternoon and low values midday. |
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