Strong correlation between levels of tropospheric hydroxyl radicals and solar ultraviolet radiation

Franz Rohrer () and Harald Berresheim
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Franz Rohrer: Forschungszentrum Jülich, Institut ICG-II: Troposphäre
Harald Berresheim: German National Meteorological Service, DWD/MOHp

Nature, 2006, vol. 442, issue 7099, 184-187

Abstract: Radical thinking The hydroxyl (OH) radical mainly determines the oxidizing power of the atmosphere. OH is important for the removal of pollutants influencing human health, climate change, and crop yield. It is widely believed that the atmosphere's oxidation efficiency may be threatened in the long-term by increasing air pollution, but data on OH trends are scarce. A set of long-term measurements taken between 1999 and 2003 at the Hohenpeissenberg Meteorological Observatory in southern Germany is therefore very welcome. The data reveal no observable trend in OH levels. Surprisingly, in view of the many reactions in which the radicals can take part, OH variability is closely and linearly related to solar ultraviolet radiation.

Date: 2006
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DOI: 10.1038/nature04924

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