Abstract
Seasonal 14C variations in atmospheric CO 2 caused by nuclear bomb tests and by fossil-fuel combustion are discussed. The investigated time interval is from 1968 to 1980. A comparison of Bratislava and Tbilisi 14C data shows that both are influenced by the Suess effect. Summer-winter 14C variations observed in these data are predominantly due to the fossil-fuel CO 2 increase during winter months. A strong correlation between the 14C concentration and the temperature during a year has been found. In contrast to the 14C variations in CO 2 from urban areas the clean air 14C data have shown that the bomb effect is responsible for the seasonal 14C variations in non-industrialized areas.
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