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In late May 2005 unusual high levels of solar ultraviolet radiation wereobserved over central Europe. In Northern Germany the measured irradiance oferythemally effective radiation exceeded the climatological mean by morethan about 20%. An extreme low ozone event for the season coincided withhigh solar elevation angles and high pressure induced clear sky conditionsleading to the highest value of erythemal UV-radiation ever observed overthis location in May since 1994. This hereafter called "ozone mini-hole"was caused by an elevation of tropopause height accompanied with a polewardadvection of ozone-poor air from the tropics. The resultant increase inUV-radiation is of particular significance for human health. Dynamicallyinduced low ozone episodes that happen in late spring can considerablyenhance the solar UV-radiation in mid latitudes and therefore contribute tothe UV-burden of people living in these regions

Episode of unusual high solar ultraviolet radiation over central Europe due to dynamical reduced total ozone in May 2005