Carbon isotopes in dissolved inorganic carbon as tracers of carbon sources in karst waters of the Plitvice Lakes, Croatia
Posted on 2020-08-13 - 14:18
Carbon isotope composition of dissolved inorganic carbon (DIC) was studied at springs, lakes and
tributaries of the Plitvice Lakes. The Plitvice Lakes are a unique and complex karst lakes system consisting of 16
flow-through lakes connected by waterfalls and streams and characterized by intense calcium carbonate precipitation
in the form of tufa and lake sediments. Two main springs have different 14C concentrations due to different
geology and their variations were controlled by flow rates. Further downstream, at lakes to the Korana
River that outflows from the lakes, the 14C activity and δ13C consistently increased down the flow. Carbon isotope
composition from 2010 to 2015 was compared with the values measured 30 years earlier. The variation in
δ13CDIC was accounted for seasonal change, while 14C activity of surface water DIC decreased 7–12% during
the 30 years. Using a semi-empiric model, it is calculated that the downstream increase is controlled by the
exchange of DIC and atmospheric CO2 carbon and by introduction of decomposed biogenic carbon from the
top soil organic matter of the lakes surrounding area in almost equal proportions.
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Sironić, Andreja; Bronić, Ines Krajcar; Horvatinčić, Nada; Barešić, Jadranka; Borković, Damir; Vurnek, Maja; et al. (2020). Carbon isotopes in dissolved inorganic carbon as tracers of carbon sources in karst waters of the Plitvice Lakes, Croatia. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.5090982.v1
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AUTHORS (7)
AS
Andreja Sironić
IB
Ines Krajcar Bronić
NH
Nada Horvatinčić
JB
Jadranka Barešić
DB
Damir Borković
MV
Maja Vurnek
IM
Ivanka Lovrenčić Mikelić