Abstract
Geostatistical analysis of experimental isotope data has been carried out with the aim to study spatial variations in the distribution of water isotopes and radiocarbon in groundwater of Žitný ostrov (Rye Island), which is the largest reservoir (about 10 Gm3) of groundwater in the Central Europe. Subsurface water profiles showed enriched δ18O levels at around 20 m water depth and depleted values below 30 m, which are similar to those observed in the Danube River. The core of the subsurface 14C profile represents contemporary groundwater with 14C values above 80pMC.
Highlights
Stable and radioactive isotopes have been extensively used as environmental tracers during the last decades to study the water cycle, to better understand the origin, dynamics and interconnections of the different elements of the hydrologic cycle
With the development of the IAEA’s Global Network of Isotopes in Precipitation (GNIP) database it has been possible to use isotopes in hydrological, ecological and climate studies, as input functions have been available for many areas of the world [4]
The GNIP database has provided key data for the application of isotopes in hydrology, and in climatic and ecological studies. This monitoring activity has been enlarged to isotopes in the total water cycle, and the new isotope database (Isotope Hydrology Information System (ISOHIS), www.ISOHIS.IAEA.org), covering groundwater data, together with the GNIP database enables to study dynamics and spatial characteristics of groundwater
Summary
Stable and radioactive isotopes have been extensively used as environmental tracers during the last decades to study the water cycle, to better understand the origin, dynamics and interconnections of the different elements of the hydrologic cycle. New geostatistical tools have been developed to integrate isotope data into a relational database covering hydrogeology and hydrochemistry, which using GIS would be possible to visualize, and in this way to create temporal-spatial isotope maps of groundwater [5, 6]. Such an integrated attempt will gather new information on temporal and spatial variability of groundwater, on its dynamics, on anthropogenic and climatic impacts, and on its vulnerability. In this paper we report results on the spatial radiocarbon and stable isotope (18O and 13C) variability of groundwater found at the Zitnyostrov, SW Slovakia
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