Concentration and carbon isotopic composition of atmospheric CO₂ in southern Poland¹

1 This contribution was presented at the 3rd International Conference on Analysis and evaluation of atmospheric CO₂ data, present and past which was held in Hinterzarten, Germany, 16-20 October 1989 (see Tellus 43B: 2, 1991).

Abstract

The isotopic composition of atmospheric CO₂ 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 Δ¹⁴C, δ¹³C and CO₂ 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 14C activity in tree leaves are: 239‰ (January 1983) and 21‰ yr^-1.