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

Article Abstract:

Results of the analysis of long-term measurements of atmospheric hydroxyl radical (OH) concentrations, which were taken between 1999 and 2003 at the Meteorological Observatory Hohenpeissenberg in southern Germany, are presented. The results reveal that the OH concentrations can be described by a linear dependence on solar ultraviolet radiation throughout the measurement period, despite the fact that OH concentrations are influenced by thousands of reactants.

Analysis, Ultraviolet radiation, Optical properties, Hydroxides, Tropospheric chemistry, Properties, Photolysis

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Evidence from fluid inclusions for microbial methanogenesis in the early Archaean era

Article Abstract:

Crushing extraction and carbon isotope analysis of methane-bearing fluid inclusions in 3.5-Gyr-old hydrothermal precipitates is reported to verify geological evidence for the existence of methanogens in the Archaean period. The extracted fluids contain microbial methane with carbon isotopic compositions of less than 56% included within original precipitates.

Environmental aspects, Natural history, Carbon, Archean Eon, Carbon isotopes, Methanobacteriaceae, Methanogens

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