Naslov
The increase of 14^C activity of dissolved inorganic carbon along the river course

Autori
Srdoč, Dušan ; Krajcar Bronić, Ines ; Horvatinčić, Nada ; Obelić, Bogomil

Izvornik
Radiocarbon (0033-8222) 28 (1986), 2A; 515-521

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
radiocarbon dating; dissolved inorganic carbon; Plitvice

Sažetak
Results of measurements for 3 years (1981--1983) of 14^C activity of dissolved inorganic carbon (DIG) in water samples from the Korana River, as well as that of recent tufa and aquatic plants, showed that 14^C concentration increases from karst spring to the estuary. A model describing the increase of 14^C activity was developed assuming that the increase is due to the exchange of the dissolved CO_2 in stream water with atmospheric CO_2 and to dissolution of CO_2 from the decay of organic material and root respiration. It is possible to distinguish these two contributions by measuring the 5'3C values of DIC in water. As expected, our data show that the exchange process between atmospheric CO_2 and DIC dominates at rapids and waterfalls, while biologic contribution is much higher in lakes and along the lowland flow of the Korana River. Agreement between the calculated and the measured activities supports the proposed mechanisms of chemical and isotopic exchanges in stream waters.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Geologija, Kemija

POVEZANOST RADA