Ice Regime Variation in the 20th Century Along the Serbian Sector of the Danube and Assessment of Global Climate Change Impact - page 03

Variation in Meteorological Parameters and Climate Change Impact

Winter regime analyses commonly involve specific interpretation of data on mean daily air temperatures, using sums of negative mean daily air temperatures during the winter period (hereafter denoted by SNAT or Ʃ(-θ), where θ is the air temperature in degrees Celsius). SNAT is an overall indicator of the "cold intensity" of a winter period. Mild winters are characterized by SNAT values less than 50°C, cold winters by SNAT's between 50 and 180°C, and long and exceptionally cold winters by SNAT values greater than 180°C.

Figures 8 and 9 show SNAT plots for meteorological stations at Veliko Gradište and Novi Sad, covering the period from 1924/1925 to 2013/2014 (the study period went beyond the year 2000, to show the climate change trend). Statistical SNAT indicators for the entire period, as well as for P1 and P2, are presented in Table 1.


Figure 7: Cooling rate prior to ice formation, along with SNAT curve and hydrograph, at the Bezdan hydrological station

Figure 8: Ʃ(-θ) histogram for the meteorological station at Veliko Gradište, 1901-2014.

Figure 9: Ʃ(-θ) histogram for the meteorological station at Novi Sad, 1925-2014.