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




Assessment of Several Empirical Relationships for Deriving Daily Means of UV-A Irradiance from Meteosat-Based Estimates of the Total Irradiance - Download this document for free, or read online. Document in PDF available to download.

1 Laboratory of Materials for Photovoltaics and Photonics, Institute of Applied Physics 2 LOA - Laboratoire d-optique atmosphérique 3 O.I.E. - Centre Observation, Impacts, Énergie 4 BIRA-IASB - Belgian Institute for Space Aeronomy - Institut d-Aéronomie Spatiale de Belgique

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

Keywords : UV radiation Meteosat Europe total irradiance empirical relationships





Author: Alexandr Aculinin - Colette Brogniez - Marc Bengulescu - Didier Gillotay - Frédérique Auriol - Lucien Wald -

Source: https://hal.archives-ouvertes.fr/



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