Hiatus in global warming - The example of water temperature of the Danube River at Bogojevo Gauge (Serbia)

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Abstract

The research included trends in water temperature of the Danube River at Bogojevo gauge and surface air temperature at the nearby meteorological station Sombor, as well as an analysis of the results obtained in relation to the claims of the existence of the hiatus in global air temperature increase in the period 1998-2012. In the period 1961-2013, there was a statistically significant increase in the mean annual water temperature (0.039 °C per year), as well as all the average monthly values. However, with annual values for the period 1998-2013, there was a decrease. The longest periods of negative trend (27 years) were recorded for January and February. A high correlation was found between the surface air temperature and water temperature for all monthly and seasonal values. In the mean annual air temperature the presence of the hiatus is not observed, but a negative trend is recorded in March (32 years), December (43 years), and February (49 years). The highest correlations between water temperature and North Atlantic Oscillation (NAO), Arctic Oscillation (AO), and Atlantic Multidecadal Oscillation (AMO) were obtained for the NAO in January (0.60), the AMO in autumn (0.52), and the NAO in winter (0.51). For surface air temperature, the highest correlations were registered for the AMO in summer (0.49) and the NAO in winter (0.42). The results indicate the dominant role of natural factors in the decrease of winter air temperature and water temperature of the Danube.

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Ducić, V. D., Milenković, M. D., Milijašević, D. P., Vujačić, D. M., Bjeljać, Ž. N., Lović, S. I., … Djordjević, A. D. (2015). Hiatus in global warming - The example of water temperature of the Danube River at Bogojevo Gauge (Serbia). Thermal Science, 19, S467–S476. https://doi.org/10.2298/TSCI150430133D

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