Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 1 2008 10.5194/acpd-8-453-2008 http://www.atmos-chem-phys-discuss.net/8/453/2008/ http://www.atmos-chem-phys-discuss.net/8/453/2008/acpd-8-453-2008.html http://www.atmos-chem-phys-discuss.net/8/453/2008/acpd-8-453-2008.pdf 453 488 2008-01-10 Long-term solar UV radiation reconstructed by Artificial Neural Networks (ANN) U. Feister uwe.feister@dwd.de J. Junk M. Woldt Deutscher Wetterdienst, Richard Aßmann Observatorium Lindenberg, Am Observatorium 12, 15848 Lindenberg, Germany Public Research Centre – Gabriel Lippmann, Department of Environment and Agro-Biotechnologies (EVA), 41, rue du Brill, 4422 B Grand-Duchy of Luxembourg, Luxembourg Brandenburgische Technische Universität Cottbus, Lehrstuhl für Umweltmeteorologie, Burger Chaussee 2, Haus 4/3, 03044 Cottbus, Germany Artificial Neural Networks (ANN) are efficient tools to derive solar UV radiation from measured meteorological parameters such as global radiation, aerosol optical depths and atmospheric column ozone. The ANN model has been tested with different combinations of data from the two sites Potsdam and Lindenberg, and used to reconstruct solar UV radiation at eight European sites by more than 100 years into the past. Annual totals of UV radiation derived from reconstructed daily UV values reflect interannual variations and long-term patterns that are compatible with variabilities and changes of measured input data, in particular global dimming by about 1980–1990, subsequent global brightening, volcanic eruption effects such as that of Mt. Pinatubo, and the long-term ozone decline since the 1970s. Patterns of annual erythemal UV radiation are very similar at sites located at latitudes close to each other, but different patterns occur between UV radiation at sites in different latitude regions. Bais, A., Kazantzidis, A., Kazadzis, S., and Kouremeti, N.: Application of a model derived cosine correction method on Brewer spectral measurements, European Geosciences Union, Vienna, 24–29 April 2005, Geophysical Research Abstracts, Vol. 7, 07590, 2005, SRef-ID: 1607-7962/gra/EGU05-A-07590, U05-A-07590, 2005. Bais, A. 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