Stratospheric ozone, UV radiation, and climate interactions.

The only European station with a significant trend was Thessaloniki, Greece, where spectral irradiance at 307.5 nm rose by 3.5% per decade with an increasing rate of change during the last decade, possibly because of decreasing absorption by aerosols.

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There were very small (0.02%) changes between 1900 and 1953, followed by a negative trend of 2% per decade during a “dimming” period of 1955–1980 and a positive trend of 1.5% per decade during a “brightening” period of 1980–2012.

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