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    STUDIA GEOLOGIA - Ediţia nr.1 din 2007  
         
  Articol:   PRELIMINARY RESULTS IN THE STUDY OF THE ECOSYSTEMS IN POLAR AREAS USING STABLE ISOTOPES.

Autori:  STELA CUNA, TEODOR NEGOITA, PETRE BERDEA, GABRIELA BALAS, CORNEL CUNA, NICOLAE LUPSA, VALENTIN MIREL. 		 
       
         
  Rezumat:  This preliminary study was performed on ice and snow samples collected in the Antarctic area between the Growe Mountains (730 06'' 01'''' S; 750 14'' 13'''' E) and the coastal area (690 23'''' 16'''' S; 760 22'' 47'''' E). The sampling interval was November 20, 2002 to March 24, 2003. The isotopic composition of hydrogen was carried out with a homemade mass spectrometer on the hydrogen gas obtained by quantitative reduction of water sample. The isotopic composition of oxygen was measured with an isotope ratio mass spectrometer type Atlas 86. All the samples have the specific values for the polar area. We have found the deuterium content in excess with negative values. These values ranged from -30‰ to -60‰. This result shows the evaporative origin of the samples. We have correlated the values of δD and δ18O with the temperature of the air at the time when the samples were collected and we have found that the decrease of the δ D and δ 18O values corresponds with the decrease of the temperature.  
         
     
         
         
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