engleski

Atmospheric CO2 carbon isotope composition in urban and clean areas of costal Northern Croatia

Fossil fuel combustion decrease 14C activity and 13C composition of atmospheric CO2, which is also known as the Suess effect. For one year (2021), we have been monitoring carbon isotope composition of atmospheric CO2 at locations under maritime influence of the Adriatic Sea: coastal city of Rijeka and at two clean air sites in vicinity, Gornje Jelenje and Parg with mountain climate. Carbon isotope composition at all sites shows seasonal variation, with the lowest 14C activities and δ13C in winter-spring, and the highest in summer, ranging from -41.3 to 25.2 ‰ for Δ14C and -13.1 to -11.3 ‰ for δ13C, respectively. Rijeka has systematically the lowest and Parg the highest Δ14C, however δ13C at the sites are not statistically different one from another. Leaves of deciduous trees were also collected. Their Δ14C reflect the trend of atmospheric Δ14C, being the lowest at Rijeka and highest at Parg.

14C, 13C, atmospheric CO2, the Adriatic Sea, the Suess effect, urban site, clean air site

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