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Global increases in UVB irradiance from changes in ozone and cloud-aerosol amounts 1979 to 2008

Ultraviolet irradiance (UV from 290 nm to 325 nm) reaching the earth's surface has significantly increased at all latitudes except the equatorial zone since 1979. The annual average increase was caused by a corresponding decrease in ozone amount from1979 to 1998. After 1998, mid-latitude annual average ozone amounts and UV irradiance levels have been approximately constant. Cloud plus aerosol changes over the period from 1979 to 2008 have caused significant moderation of the clear-sky UVB trends based on a preliminary analysis of UV (340 nm) scene reflectivity data from multiple satellites.