Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2018-6
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
31 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Hydrology and Earth System Sciences (HESS).
Stable isotope investigation of groundwater recharge in the Carpathian Mountains, East-Central Europe
Carmen-Andreea Bădăluță1,2,3,4, Aurel Perșoiu1,5,6, Monica Ionita4, Viorica Nagavciuc1,3,7,8, and Petruț-Ionel Bistricean2,9 1Stable Isotope Laboratory, Ștefan cel Mare University of Suceava, Suceava, Romania
2Department of Geography, Stefan cel Mare University of Suceava, Suceava, Romania
3Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences MTA, Budapest, Hungary
4Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany
5Emil Racoviţă Institute of Speleology, Cluj Napoca, Romania
6Institute of Biology, Department of Microbiology, Bucharest, Romania
7Faculty of Forestry, Stefan cel Mare University of Suceava, Suceava, Romania
8Departement of Geography, Johannes Gutenberg University, Mainz, Germany
9Regional Meteorological Center of Moldova, Suceava, Romania
Abstract. Rapid growth in water usage in NW Romania has led to an increased pressure on the available water resources; however, the relationships between precipitation, surface and groundwater in the region are poorly understood. Here, we have analyzed the stable isotopes of oxygen and hydrogen in precipitation, river and groundwater to gain information on moisture sources feeding precipitation in the area and establish the main links between the large-scale atmospheric circulation, precipitation amount and discharge. Thus, in this study we have analyzed 157 groundwater samples, 64 precipitation samples from two collection sites (one in mountain area and another one in plateau area) and 54 rivers samples from two rivers. Furthermore, we have directly linked the changes in the isotopic composition of the d-excess parameter in the precipitation with the processes linked to large-scale atmospheric circulation. Isotopes in precipitation water resulted in two LMWLs (δ2H = 7.4*δ18O + 2.7 at 350 m asl and δ2H = 8.1*δ18O + 12.4 at 1530 m asl), with a clear seasonal signal, further enhanced by secondary evaporative processes in summer. Moisture in the lowlands was mostly delivered along easterly trajectories, while that in the mountain area from the westerlies. Surface water analyses show the same trend as precipitation, but with reduced amplitude between summer and winter values. Throughout the winter season, the δprec is strongly related with different climate teleconnection patterns like the East Atlantic (EA), the North Atlantic Oscillation (NAO) and the Arctic Oscillation (AO), while during summer, the δprec shows a strong correlation with the Atlantic Multidecadal Oscillation (AMO) and the summer EA. Maps of δ18O and d-excess distribution in groundwaters show a depletive trend from NW to SE, generated in principal by topography. The waters in the aquifers show no clear patterns and altitude effect.

Citation: Bădăluță, C.-A., Perșoiu, A., Ionita, M., Nagavciuc, V., and Bistricean, P.-I.: Stable isotope investigation of groundwater recharge in the Carpathian Mountains, East-Central Europe, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2018-6, in review, 2018.
Carmen-Andreea Bădăluță et al.
Carmen-Andreea Bădăluță et al.
Carmen-Andreea Bădăluță et al.

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