Isotopic composition of precipitation in Ljubljana (Slovenia)

Vreča, Polona; Bronić, Ines Krajcar; Leis, Albrecht; Brenčič, Mihael

doi:10.5474/geologija.2008.018

Cited by 26 publications

(60 citation statements)

References 9 publications

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“…This means that the source of the water of Sovra borehole is from higher altitudes or it originates from winter precipitation (Table ). Autumn to winter precipitation in the area usually has higher deuterium excess (Vreča et al ., ).…”

Section: Resultsmentioning

confidence: 99%

Assessment of the physical environment of epigean invertebrates in a unique habitat: the case of a karst sulfidic spring, Slovenia

et al. 2014

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A well‐fissured and faulted karst area at the Žveplenica sulfidic spring created suitable conditions for epigean copepods. Their presence in sulfidic water is a rare phenomenon. To understand the conditions related to sulfidic habitats in the region, two additional springs were analysed: the Studenec karst spring and the Sovra artesian borehole, which contains dissolved sulfide. Water temperature, chemistry and the stable isotopes of oxygen and hydrogen show that the Sovra borehole water has a different origin and history to that of the Žveplenica and Studenec springs water, which is derived from local precipitation. The low slope of the δ18O–δ2H regression line for the Žveplenica spring indicates a mixing of local precipitation water with geothermal sulfidic water that may explain the presence of live copepods. These harpacticoid and cyclopoid copepods must have survived anoxia and high sulfide for some time. The mean transit time for Žveplenica spring cannot be defined precisely from the available data, although the degree of attenuation of the isotopic signal indicates mean transit times of about 1·0 to 1·5 years. Sites similar to Žveplenica spring should be carefully analysed because not only do they provide insights into biodiversity but they also represent an ecotone between the anoxic/oxic and high/low sulfide of these karst waters. Copepods in similar geological settings can be used as additional parameters to evaluate conditions in subsurface sulfidic habitats and their spatial connectivity and responses to hydrological events. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Assessment of the physical environment of epigean invertebrates in a unique habitat: the case of a karst sulfidic spring, Slovenia

et al. 2014

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“…The histogram in Figure 3 presents the distribution of tritium in groundwater with a mean value of 6.2 TU, and the arrow at 8.9 TU shows the mean value of tritium over the last few years (2002)(2003)(2004)(2005)(2006) in precipitation for Ljubljana. [45] Since the tritium values in the sampled groundwater are close to the values measured in the precipitation, it is expected that the sampled groundwater is quite young, not exceeding 10 years.…”

Section: Groundwater Dynamicsmentioning

confidence: 97%

The isotope altitude effect reflected in groundwater: a case study from Slovenia

Mezga

Urbanc

Cerar

2014

Isotopes in Environmental and Health Studies

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This paper presents the stable isotope data of oxygen (δ(18)O) and hydrogen (δ(2)H) in groundwater from 83 sampling locations in Slovenia and their interpretation. The isotopic composition of water was monitored over 3 years (2009-2011), and each location was sampled twice. New findings on the isotopic composition of sampled groundwater are presented, and the data are also compared to past studies regarding the isotopic composition of precipitation, surface water, and groundwater in Slovenia. This study comprises: (1) the general characteristics of the isotopic composition of oxygen and hydrogen in groundwater in Slovenia, (2) the spatial distribution of oxygen isotope composition (δ(18)O) and d-excess in groundwater, (3) the groundwater isotope altitude effect, (4) the correlation between groundwater d-excess and the recharge area altitude of the sampling location, (5) the relation between hydrogen and oxygen isotopes in groundwater in comparison to the global precipitation isotope data, (6) the groundwater isotope effect of distance from the sea, and (7) the estimated relation between the mean temperature of recharge area and δ(18)O in groundwater.

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“…The gas proportional counting technique (GPC) was used until 2009; since 2010, samples have been measured by the liquid scintillation counting technique (LSC) following electrolytic enrichment (EE), while during 2008 and 2009 both GPC and LSC-EE techniques were used, depending on the available sample quantity. The limit of detection (LOD) was 2.5 TU and 0.5 TU for GPC and LSC-EE techniques, respectively (for details see barešIć et al, 2010Krajcar bronIć et al, 2013;Vreča et al, 2014).…”

Section: Tritium Activitymentioning

confidence: 99%

“…However, most of the tritium present in the atmosphere and hydrosphere is of anthropogenic origin, i.e., tritium was released in atmospheric thermonuclear tests during 1960's, reaching in 1963 several orders of magnitudes higher tritium activity concentration in the atmosphere than the natural levels. After the test ban treaty in 1963, atmospheric tritium activity has been decreasing almost exponentially in the following decades, while during last 10-15 years the mean tritium activity has not been significantly changed (Krajcar BronIć et al, 2006;Vreča et al, 2014; Internet 2). Nowadays, tritium has reached in precipitation levels similar to those occurring before the thermonuclear tests, about 5 TU in central Europe (Internet 2).…”

Section: Introductionmentioning

confidence: 99%

“…The isotope data obtained until 2006 for Portorož (Vreča et al, 2005(Vreča et al, , 2006(Vreča et al, , 2007(Vreča et al, , 2011 are also available in the GNIP database. The data were used in different hydrogeochemical investigations of aquifers in Slovenia (brenčIč, 2009;Mezga, 2014;Mezga et al, 2014;VerboVšeK & Kanduč, 2015), Croatia (MandIć et al, 2008 and in Italy (cucchI et al, 2008), as well as in investigations of precipitation (lIotta et al, 2008;VodIla et al, 2011;MIchelInI, 2013;Vreča et al, 2014;BrenčIč et al, 2015, KoVačIč, 2015, moisture recycling in Alpine regions (FroehlIch et al, 2008) and identification and characterisation of nitrate pollution sources in Marano lagoon in Italy (Saccon et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Isotopic composition of precipitation at the station Portorož, Slovenia – period 2007–2010

Vreča¹,

Bronić²,

Leis³

2015

Geologija

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The stable isotopic composition of oxygen and hydrogen (δ 18 O and δ 2 H) and the tritium activity (A) were monitored in precipitation at synoptic station Portorož (Slovenia) during the period 2007-2010. Monthly and yearly isotope variations are discussed and compared with those observed over the period 2001-2006 and with the basic meteorological parameters. The mean values for δ 18 O and δ 2 H, weighted by precipitation, are-6.28 ‰ and-41.6 ‰, and these values are 0.35 ‰ and 1.6 ‰ higher but not significantly different than for the period 2001-2006. The reduced major axis (RMA) local meteoric water line (LMWL RMA) for the period 2007-2010 is δ 2 H = (8.14 ± 0.25)×δ 18 O + (8.28 ± 1.64), while the precipitation weighted least square regression (PWLSR) results in LMWL PWLSR δ 2 H = (7.87 ± 0.28)×δ 18 O + (7.97 ± 1.87). The deuterium excess (δ) weighted mean value is 8.6 ‰ and is 1.2 ‰ lower than in 2001-2006, while the temperature coefficient of δ 18 O is 0.21 ‰/°C and is for 0.02 ‰/°C higher than for the previous period. The mean Mediterranean precipitation index (MI) for the period 2007-2010 is 2.3. Lower values of MI and deuterium excess than in the preceding period indicate stronger continental climatic character during observation period, however the differences are not statistically significant. The weighted mean tritium activity is 6.4 TU, which is 0.5 TU lower but not significantly different than in 2001-2006. Izvleček V prispevku obravnavamo izotopsko sestavo kisika in vodika (δ 18 O in δ 2 H) ter aktivnosti tricija (A) v mesečnih vzorcih padavin, ki smo jo spremljali na sinoptični postaji Portorož (Slovenija) v obdobju 2007-2010. Analizirali smo mesečne in letne spremembe izotopske sestave padavin in jih primerjali z nizom podatkov za obdobje 2001-2006 ter z osnovnimi meteorološkimi parametri. Srednje tehtane vrednosti δ 18 O in δ 2 H določene ob upoštevanju izmerjene količine padavin znašajo

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Isotopic composition of precipitation in Ljubljana (Slovenia)

Abstract: The stable isotopic composition of hydrogen and oxygen (δ 2 H and δ 18 O) and tritium activity ( 3 H) are monitored in monthly precipitation at Ljubljana since 1981. Here we present complete set of numerical data and the statistical analysis for period

Cited by 26 publications

References 9 publications

Assessment of the physical environment of epigean invertebrates in a unique habitat: the case of a karst sulfidic spring, Slovenia

Assessment of the physical environment of epigean invertebrates in a unique habitat: the case of a karst sulfidic spring, Slovenia

The isotope altitude effect reflected in groundwater: a case study from Slovenia

Isotopic composition of precipitation at the station Portorož, Slovenia – period 2007–2010

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