Jadranka Barešić

Rudjer Boskovic Institute

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Ines Krajcar Bronić

Rudjer Boskovic Institute

Nada Horvatinčić

Rudjer Boskovic Institute

Andreja Sironić

Rudjer Boskovic Institute

Bogomil Obelić

Rudjer Boskovic Institute

Damir Borković

Rudjer Boskovic Institute

Sanja Faivre

University of Zagreb

Tatjana Bakran‐Petricioli

University of Zagreb

Polona Vreča

Jožef Stefan Institute

Zoran Kovač

University of Zagreb

Nenad Buzjak

University of Zagreb

Cooperative Institutions

University of Arizona

Institut de l'Information Scientifique et Technique

University of Zagreb

Rudjer Boskovic Institute

Centre National de la Recherche Scientifique

University of Cologne

New York University Press

University of Novi Sad

Croatian Geological Survey

Jožef Stefan Institute

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Distribution of authigenic and allogenic fractions in recent lake sediment: Isotopic and chemical compositions

Acta Carsologica (2012)

Jadranka Barešić Nada Horvatinčić Polona Vreča Andreja Sironić

Recent sediments in Lake Kozjak, in the Plitvice Lakes National Park, Croatia, were used to study the impact of the material delivered to the lake sediment via Rječica Brook. Sediment cores, top 40 cm, were taken near the mouth of the Rječica Brook at three locations in the lake at different distances from the shore, water depth 2-9 m and analyzed using different isotopic and chemical methods. Sediment depth profiles of the following parameters were obtained: organic and carbonate fraction, C/N analyses of organic fraction, 14C activity (a14C) and d13C values of carbonate (d13Ccarb) and organic fraction (d13Corg) and d15N of total nitrogen. The results were compared with sediment core collected in the middle of Lake Kozjak, water depth 21 m. Distribution of organic matter, C/N values, d13Corg and d13Ccarb in sediment profiles showed strong influence of terrestrial organic and carbonate fraction run-off via Rječica Brook which decreased rapidly in the direction of the open lake. The sedimentation rate as well as the ratio of allogenic and authigenic fraction in sediments was estimated. Lower d13Corg values in surface sediments might be a consequence of the increase in algal productivity but might also be a contribution of fossil fuel combustion. The anthropogenicaly induced 14C in the atmosphere in 1963/64 is visible though shadowed in sediments.

Authigenic

Sedimentation

Fraction (chemistry)

10.3986/ac.v40i2.14

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Citations (13)

Tufa growth at the Zrmanja and the Krupa rivers and possibilities for palaeoclimate reconstruction, Croatia

Jadranka Barešić Andreja Sironić Damir Borković Nada Horvatinčić Ines Krajcar Bronić

Tufa

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The Potential of Tufa as a Tool for Paleoenvironmental Research—A Study of Tufa from the Zrmanja River Canyon, Croatia

Geosciences (2021)

Jadranka Barešić Sanja Faivre Andreja Sironić Damir Borković Ivanka Lovrenčić Mikelić

Tufa is a fresh-water surface calcium carbonate deposit precipitated at or near ambient temperature, and commonly contains the remains of macro- and microphytes. Many Holocene tufas are found along the Zrmanja River, Dalmatian karst, Croatia. In this work we present radiocarbon dating results of older tufa that was found for the first time at the Zrmanja River near the Village of Sanaderi. Tufa outcrops were observed at different levels, between the river bed and up to 26 m above its present level. Radiocarbon dating of the carbonate fraction revealed ages from modern, at the river bed, up to 40 kBP ~20 m above its present level. These ages fit well with the hypothesis that the Zrmanja River had a previous surface connection with the Krka River, and changed its flow direction toward the Novigrad Sea approximately 40 kBP (Marine Isotope Stage 3). Radiocarbon AMS dating of tufa organic residue yielded a maximum conventional age of 17 kBP for the highest outcrop position indicating probable penetration of younger organic material to hollow tufa structures, as confirmed by radiocarbon analyses of humin extracted from the samples. Stable carbon isotope composition (δ13C) of the carbonate fraction of (−10.4 ± 0.6)‰ and (−9.7 ± 0.8)‰ for the Holocene and the older samples, respectively, indicate the autochthonous origin of the carbonate. The δ13C values of (−30.5 ± 0.3)‰ and (−29.6 ± 0.6)‰ for organic residue, having ages <500 BP and >5000 BP, respectively, suggest a unique carbon source for photosynthesis, mainly atmospheric CO2, with an indication of the Suess effect in δ13C during last centuries. The oxygen isotopic composition (δ18O) agrees well with deposition of tufa samples in two stages, the Holocene (−8.02 ± 0.72‰) and “old” (mainly MIS 3 and the beginning of MIS 2) (−6.89 ± 0.34‰), suggesting a ~4 °C lower temperature in MIS 3 compared to the current one.

Tufa

Outcrop

10.3390/geosciences11090376

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Citations (11)

Response of karst sediments to the atmospheric 14C bomb peak

Andreja Sironić Jadranka Barešić Igor Felja Andrej Vraničar Ines Krajcar Bronić

The global atmospheric 14C bomb peak from 1963 is reflected in 14C activity of natural archives like tree rings, speleothems, corrals, sediments, etc. The attenuation and time delay of the peak in the archives compared to the atmospheric one can be used as a tool to study the carbon cycle of interest. The sediment cores from lakes Kozjak, Prosce, Gradinsko and Kaluđerovac from the Plitvice Lakes, karst area in Croatia, were retrieved in two sampling campaigns in 2003 and in 2011 on different locations and different lake depths. Some results of 14C activity in the sediment cores dated by 210Pb and 137Cs have already been reported. Here we present new results for the Lake Kaluđerovac and Lake Kozjak cores collected at the deepest points of the lakes, dated by 210Pb. In addition, 14C activity of laminated tufa that grew from 1979 to 2005 on a wooden pillar immersed in the Korana River is also presented. The 14C bomb-peak reflection is observed in carbonate and organic fractions of the sediment cores from the middle of lakes, and also in carbonate fraction of the laminated tufa, with attenuation and delay ranging from 28 to 36 years. The intensity of attenuation and delay compared to the atmospheric bomb peak in the laminated tufa and sediments will be discussed in relation with the lakes size and the sampling location.

Tufa

Speleothem

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Carbon isotope fractionation in karst aquatic mosses

Isotopes in Environmental and Health Studies (2020)

Andreja Sironić Antun Alegro Nada Horvatinčić Jadranka Barešić Andrijana Brozinčević

Radiocarbon activity (a14C) and 13C composition (δ13C) were measured in hygrophyte and mesophyte (land) mosses collected in the natural habitat of the Plitvice Lakes and along the Zrmanja and Krupa Rivers (typical continental and Mediterranean climates, respectively), Croatia. a14C and δ13C values of mosses, of atmospheric CO2 and dissolved inorganic carbon (DIC) were compared with contemporary data and with data from 30 years ago at the Plitvice Lakes when 14C activity of atmospheric CO2 was ∼30% higher. A positive correlation between a14Cmoss and δ13Cmoss was observed for all data reflecting the change of carbon isotopic composition in DIC along the water flows and in atmospheric CO2 regardless of the climatic regions and historic period. Fraction of the atmospheric carbon in moss (ωatm.C) and carbon fractionation factor from aquatic CO2 (DIC) to moss tissue (εmoss/g−aq) were calculated for each individual moss. Three species of mosses had ωatm.C ∼ 0 % implying that they turn to anabiosis during dry periods. The relation εmoss/g−aqvs.ωatm.C differentiates true aquatic and amphiphyte mosses. The first had a statistically significant negative correlation between εmoss/g−aq and ωatm.C. The amphiphyte mosses had lower εmoss/g−aq with higher water flow rates.

Carbon fibers

Carbon-14

10.1080/10256016.2020.1852235

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Citations (3)

Fossil tufa barrier Gazin kuk at the Zrmanja River (Croatia)

Iva Veverec Sanja Faivre Jadranka Barešić Nenad Buzjak Nada Horvatinčić

Tufa

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Isotope Composition of Precipitation, Groundwater, and Surface and Lake Waters from the Plitvice Lakes, Croatia

Water (2020)

Ines Krajcar Bronić Jadranka Barešić Andreja Sironić Ivanka Lovrenčić Mikelić Damir Borković

The application of tritium, 2H, and 18O in the characterization of the precipitation, groundwater, and surface and lake water of the Plitvice Lakes (PL), Croatia, over the 1979–2019 period is presented. An increase in the mean annual air temperature of 0.06 °C/year and in the annual precipitation amount of 10 mm/year is observed. The good correlation of the tritium activity concentration in the PL and Zagreb precipitation implies that the tritium data for Zagreb are applicable for the study of the PL area. The best local meteoric water line at PL was obtained by the reduced major axis regression (RMA) and precipitation-weighted ordinary least squares regression (PWLSR) approaches: δ2HPWLSR = (7.97 ± 0.12) δ18O + (13.8 ± 1.3). The higher deuterium excess at PL (14.0 ± 2.2 ‰) than that at Zagreb reflects the higher altitude and influence of the Mediterranean precipitation. The δ2H in precipitation ranges from −132.4‰ to −22.3‰ and δ18O from −18.3 ‰ to −4.1‰. The much narrower ranges in the groundwater (<1‰ in δ18O, <10‰ in δ2H) indicate the good mixing of waters in aquifers and short mean residence times. The higher average δ2H in all three karst springs observed after 2003 can be attributed to the increase in the mean air temperature. The mean δ2H and δ18O values in the surface and lake water increase downstream due to the evaporation of surface waters. There is no significant difference between the surface water line and the lake water line (2011–2014). The stable isotope composition of the surface and lake waters reacts to extreme hydrological conditions.

δ18O

10.3390/w12092414

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A new approach on data extrapolation for mortar dating in the Zagreb Radiocarbon Laboratory

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2023)

Andreja Sironić Alexander Cherkinsky Damir Borković Suzana Damiani Jadranka Barešić

Phosphoric acid

Hardening (computing)

10.1016/j.nimb.2023.01.020

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Radiocarbon Dating of Ahdname, Mantel, and Armorial from the Fojnica Franciscan Monastery, Bosnia and Herzegovina

Radiocarbon (2017)

Nada Horvatinčić Andreja Sironić Jadranka Barešić Igor Kozjak

Abstract In this work, we present the results of radiocarbon ( 14 C) dating of three historically important objects related to the period of the reign of the Ottoman Empire in Europe. The following objects from the museum collection of the Franciscan Monastery in Fojnica, Bosnia and Herzegovina were 14 C dated: (1) paper from the Ahdname ( Fojnička ahdnama ); (2) textile of the mantel of Fra Anđeo Zvizdović; and (3) paper from the Fojnica Armorial ( Fojnički grbovnik ). It was assumed that the Ahdname was issued in AD 1463 by the Ottoman Sultan Mehmed II to the Catholic monks and that the Mantel had belonged to Fra Anđeo Zvizdović, who received the Ahdname. The Fojnica Armorial is an important source of the classical heraldry of the Balkans Peninsula, with various estimates of the age. The 14 C calibrated ages of the Ahdname are as follows: lower part, cal AD 1430–1465, upper part, cal AD 1665–1808, proving that only the lower part of the Ahdname was original. The 14 C calibrated age of the textile from the outer layer of the Mantel is cal AD 1492–1641, somewhat younger than expected, and inner lining even younger, cal AD 1652–1805. Good coincidence between the calibrated age span of the renewed part of the Ahdname and the lining material of the Mantel can suggest that both objects had been renewed around the same time. Two samples of the Fojnica Armorial were dated: thick paper, cal AD 1631–1667 and thin paper, cal AD 1809–1926, showing that the Armorial had been compiled during different periods.

Peninsula

Reign

10.1017/rdc.2017.40

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Citations (2)

USE OF NUCLEAR POWER PLANT RELEASED TRITIUM AS A GROUNDWATER TRACER

Rudarsko-geološko-naftni zbornik (2020)

Jadranka Barešić Jelena Parlov Zoran Kovač Andreja Sironić

Tritium presents a natural radioactive isotope which can be used as a tracer in hydrology.This paper presents the usage of tritium in hydrogeological research of the Zagreb aquifer, which presents the country`s strategic water reserves and is protected by the Republic of Croatia.In the research area, higher tritium content in surface water and groundwater is the result of releasing coolant water from the Nuclear power plant Krško.Tritium content was measured in 13 piezometers and one pumping well, in the wider area of the Petruševec and Kosnica well fields.It has been shown that tritium from cooling water is much more pronounced than its natural seasonal variability, and it can be very useful as a tracer.Also, results showed that the intensity and delay of responses in the aquifer depend on their distance from the Sava River and piezometer depth.Furthermore, the results suggest that variable hydrologic conditions can generate rapid change in the groundwater flow direction and affect tritium transport through the aquifer.

Piezometer

TRACER

Tritiated water

10.17794/rgn.2020.1.3

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Citations (11)