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12 October 2006 Estimation of UV irradiance from ancillary data and comparison with measurements at Thessaloniki, Greece (40.5°N, 23°E)
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The decrease in stratospheric ozone observed during last decades and the possible relationship with the observed increase UV-B radiation in biosphere has been extensively discussed in relevant studies. However, the detection of UV trends is difficult due to lack of long-term measurements of UV radiation at the Earth's surface, and the large variability introduced by changes in cloudiness, aerosols and surface albedo. Recently, several methods for reconstruction of UV radiation levels for the past at single sites have been proposed. In most of these studies, measurements of total ozone and empirical or model derived relations for the impact of clouds and surface albedo on UV transmittance have been used. In this study, a method for estimating erythemal (CIE) UV doses using measurements of total ozone and total solar radiation is presented for Thessaloniki, Greece (40.5°N, 23°E). Measurements of total solar radiation and UV erythemal dose rates for five years period (2000-2004) were used to estimate the effect of clouds and aerosols as a function of solar zenith angle (SZA). The method is then tested, when compared with measurements from previous years. The mean difference (%) between measured and modeled cloud modification factors for UV dose rates was calculated between -1.3% and 2.4% for all SZA groups.
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A. Kazantzidis, A. Bais, K. Garane, S. Kazadzis, and C. Meleti "Estimation of UV irradiance from ancillary data and comparison with measurements at Thessaloniki, Greece (40.5°N, 23°E)", Proc. SPIE 6362, Remote Sensing of Clouds and the Atmosphere XI, 636228 (12 October 2006);


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