Abstract
The isotopic composition of atmospheric CO 2 and its concentration in the Krakow region has been measured since 1983. Air samples have been collected in bi-weekly intervals close to the center of Krakow. The six years records (1983–88) of these data reveal multi-annual linear trends and winter-summer oscillations. The calculated parameters of the individual regression lines (intercept and slope) for the measured Δ 14 C, δ 13 C and CO 2 concentration, C, are: 173‰ (January 1983) and − 10.7‰ yr -1 , − 9.58‰ (January 1983) and – 0.038‰ yr -1 , 371 ppmv (January 1983) and 1.0 ppmv yr -1 , respectively. The 14C activity in tree leaves collected in a mountain region, about 60 km from Krakow was also assessed. The parameters of the linear decrease of 14 C activity in tree leaves are: 239‰ (January 1983) and 21‰ yr -1 . DOI: 10.1034/j.1600-0889.1991.t01-4-00003.x
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