Assessment of Several Empirical Relationships for Deriving Daily Means of UV-A Irradiance from Meteosat-Based Estimates of the Total Irradiance

摘要: Daily estimates of the solar UV-A radiation (315–400 nm) at surface, anywhere, anytime, are needed in many epidemiology studies. Satellite-derived databases total irradiance, combined with empirical relationships converting totals into daily means irradiance I UV , a to satisfy such needs. Four applied three different databases: HelioClim-3 (versions 4 and 5) CAMS Radiation Service—formerly known as MACC-RAD—derived from Meteosat images. The results these combinations compared ground-based measurements located mid-latitude Europe, mostly Belgium. Whatever database, Podstawczynska (2010) Bilbao et al. (2011) exhibit very large underestimation RMSE on order 40%–50% mean UV. Better more acceptable attained proposed by Zavodska Reichrt (1985) that Wald (2012). relative is still range 10%–30% correlation coefficients for all relationships. Each them captures most variability contained can be used studies where plays major role.