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Isotope composition of precipitation in Croatia: comparison of continental and maritime stations

Monitoring of isotope composition (2H, 3H, 18O) of precipitation at Zagreb (Croatia) and Ljubljana (Slovenia) has been performed since 1976 and 1980, respectively (IAEA, 1994 ; 2004) within the GNIP Network. These stations show the isotope composition pattern typical of continental stations of the Northern Hemisphere (Krajcar Bronić et al, 1998). Within the IAEA Co-ordinated Research Program "Isotopic Composition of Precipitation in the Mediterranean Basin in Relation to Air Circulation Patterns and Climate" the network has been extended to several stations along the Adriatic coasts of Croatia and Slovenia. Sampling of monthly precipitation has been performed since September 2000 at additional stations in Croatia: Malinska on Krk Island (45°01'N, 14°37'E, 1 m a.s.l., north Adriatic), Zadar (44°08'N, 15°13'E, 5 m a.s.l., mid-Adriatic), Komiža on Vis Island (43°03'N, 16°42'E, 6 m a.s.l., south Adriatic), Dubrovnik (42°39'N, 18°05'E, 52 m a.s.l., south Adriatic), and Zavižan on Mt. Velebit (44°49'N, 14°59'E, 1594 m a.s.l., high-altitude station above the mid-Adriatic coast). Additional sampling stations in Slovenia are Portorož-Airport (45°28'N, 13°37'E, 2 m a.s.l.) and Kozina (45°36'N, 13°56'E, 497 m a.s.l.), both at the north Adriatic coast. Here we present the tritium and stable isotope composition of precipitation at marine stations for the period 2000 – 2003 and compare the results with the long-term data for continental stations. The relations between the temperature and d18O, between d18O and d2H, and the altitude and d18O, are studied in particular. The presented data shows present-day temporal and spatial distribution of tritium and stable isotopes 2H and 18O in precipitation of a relatively small area rich in climatic and orologic diversity. The data can be used in various applications, such as climatology and hydrology. The database can also be useful in case of a nuclear accident or any other accidental release of tritium into the atmosphere.

tritium; stable isotopes; precipitation; Croatia

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