Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 1 2008 10.5194/acpd-8-21-2008 http://www.atmos-chem-phys-discuss.net/8/21/2008/ http://www.atmos-chem-phys-discuss.net/8/21/2008/acpd-8-21-2008.html http://www.atmos-chem-phys-discuss.net/8/21/2008/acpd-8-21-2008.pdf 21 45 2008-01-04 Measurements of UV radiation on rotating vertical plane at the ALOMAR Observatory (69° N, 16° E), Norway, June 2007 P. Sobolewski J. W. KrzyÅ›cin jkrzys@igf.edu.pl J. JarosÅ‚awski K. Stebel Institute of Geophysics, Polish Academy of Science, Warsaw, Poland Norwegian Institute for Air Research, Kjeller, Norway Erythemaly weighted UV and total UVA irradiance measured at the ALOMAR (Arctic Lidar Observatory for Middle Atmosphere Research; 69° N, 16° E) in June 2007 by two Kipp & Zonen UV broadband meters type, UV-S-AE-T, are examined. One unit is movable and mounted to rotating vertical plane, and the other is permanently fixed horizontally. The UV broadband meters measure simultaneously to allow the comparison of UV irradiances on vertical and horizontal plane. The entire range of relative exposure variations during clear-sky conditions over ALOMAR is examined using STAR and Radonic1 model (developed at the Meteorological Institute, Munich) for various action spectra (erythema, UVA, and vitamin D₃). It seems that multiplication of the daily mean dose from a standard broadband meter placed horizontally by 0.5 gives reasonable estimation of the daily mean exposure on a vertical plane randomly oriented towards Sun. The extreme value and daily variability of relative exposure are the highest for UVA, next for UVB, then for vitamin D₃ weighed UV irradiance. The minima of relative exposure (~0.20–0.30) are almost the same for all weighting functions. Specific cloud configuration could lead to significant enhancement of UV relative exposure of rotating plane being the most pronounced when biometer is in shadow. 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