A preliminary study on the correlation between TOMS aerosol index and ground-based measured aerosol optical depth |
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| Institution: | 1. Institute for Environmental Research and Sustainable Development, National Observatory of Athens, 11810 Athens, Greece;2. Laboratory of Meteorology, Department of Physics, University of Ioannina, 45110 Ioannina, Greece;3. LOA, University of Lille-1, 59655, Villeneuve d''Ascq, France;4. Natural Resources and Environment College, Ferdowsi University of Mashhad, Mashhad, Iran;5. Aryabhatta Research Institute of Observational Science, Nainital 263 001, India |
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| Abstract: | The aim of this work is to study the correlation between ground-based measured aerosol optical depth (AOD) and TOMS Aerosol Index. For this reason, two AOD data-sets have been analysed. The first set of measurements has been obtained in a desert plateau in Namibia during July 1998, while the second one has been collected in Tito Scalo (Italy), a very small industrial zone surrounded by a large rural area, in June–July 2000. The AOD has been computed in the spectral range 400–870 nm with a resolution of 3 nm by measuring the direct solar irradiance. The used spectroradiometer is an Optical Spectrum Analyser, equipped with a continuously rotating diffraction grating. Successively, a correlation between the Earth Probe TOMS Aerosol Index, whose definition uses backscattered radiances at 331 and 360 nm, and the AOD in the visible range was searched for. A satisfying correlation was found, whose Pearson correlation coefficient R2 values range from 0.64 to 0.91. |
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