Naslov
Distribution of hydrogen, oxygen and carbon isotopes in the atmosphere of Croatia and Slovenia

Autori
Krajcar Bronić, Ines ; Vreča, Polona ; Horvatinčić, Nada ; Barešić, Jadranka ; Obelić, Bogomil

Izvornik
Arhiv za higijenu rada i toksikologiju (0004-1254) 57 (2006), 1; 23-29

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
tritium; stable isotopes; 2H; 18O; precipitation; atmosphere

Sažetak
Natural cycles of water and carbon can be studied by monitoring the isotopic composition of H2O and CO2 in the atmosphere. The monitoring includes isotopes 2H, 3H and 18O in precipitation, and 13C and 14C in atmospheric CO2. The results of such a monitoring of the atmosphere over Croatia and Slovenia during last several years are presented here. Monthly precipitation samples at Zagreb and Ljubljana have been collected since 1976 and 1981, respectively. In the period 2000-2003 the sampling network has been extended to 7 stations along the Adriatic coast of the two countries. Tritium activity in precipitation shows seasonal variations that are most pronounced at the continental stations (Zagreb, Ljubljana) followed by the north-Adriatic (Portorož, Kozina, Malinska) and mid-Adriatic stations (Zadar, Zavižan), and the smallest are at the south-Adriatic stations (Komiža, Dubrovnik). The mean annual tritium activity also decreases from the north to the south of the Adriatic coast. Seasonal variations in d2H and d18O in precipitation follow the temperature variations at the sampling station, and the mean annual d18O values follow the mean annual temperatures. Thus, the south-Adriatic stations show the smallest variations in  18O and highest mean d18O values. Atmospheric CO2 has been collected on a monthly basis in Zagreb and Plitvice. Seasonal variations in both d14C and d13C have been observed. The mean annual 14C activities in Zagreb were decreasing after the maximum in 1960-ties and approached the natural pre-bomb activities. During the last 3 years the mean 14C activity D14C remains about 30‰ .

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Geologija

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