engleski

Isotope variations in precipitation along the Adriatic coast of Slovenia and Croatia

Precipitation is of major interest in the hydrologic cycle as it is the ultimate source of water to catchments. Within the Global Network of Isotopes in Precipitation (GNIP) organised by IAEA and WMO worldwide monitoring of isotopes in precipitation is performed. Monitoring of isotopes in monthly precipitation within the GNIP has been performed at continental stations in Ljubljana (Slovenia) and Zagreb (Croatia) since 1980 and 1976, respectively. In the framework of IAEA Co-ordinated Research Program “ Isotopic Composition of Precipitation in the Mediterranean Basin in Relation to Air Circulation Patterns and Climate” the monitoring program was extended in the period between October 2000 and December 2003 to several sampling stations along the Adriatic coast of Slovenia and Croatia. The main purpose of our investigation was (1) to determine the monthly variability of isotopic composition in precipitation along the Adriatic coast and, (2) to correlate these variations to the general meteorological parameters, such as temperature and precipitation amount. The coastal stations show smaller seasonal stable isotope variations than continental stations due to smaller temperature variations. Obtained data fit very well to the Craig’ s Global Meteoric Water Line (GMWL). Some deviations were observed in summer months and are probably a result of partial evaporation of raindrops. Good correlation between stable isotopic data and air temperature was observed at all sampling stations. Tritium activity concentrations in monthly precipitation vary seasonally at all stations and are typical for coastal and continental stations of Northern Hemisphere.

precipitation; Adriatic coast; tritium; stable isotopes

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