Long-time changes of the thermal continentality index; the amplitudes and the phase of the seasonal temperature variation in Ukraine
Keywords:climate change, climate of Ukraine, thermal index of continentality, amplitude and phase of seasonal fluctuations of temperature
Special features of spatial-temporal variations of continentality indices Gorczynsky and Johanson—Ringleb as well as an amplitude and phase of the seasonal change of temperature in the territory of Ukraine under conditions of global warming have been analyzed. Long-term empirical data (average month temperature) have been used obtained in the net of meteorological stations of Ukraine evenly located in the plain territory of Ukraine (height not more than 350 m above sea level) during the period 1900—2017. The changes of amplitude and phase of seasonal temperature variations were studied with the help of Fourier analysis. It has been found that against the background of general decrease of the values of continentality indices of the climate in the territory of Ukraine during the period 1900—2017 (due to considerable warming in the cold period of the year) increasing tendencies (KG by 6 % per 100 years and KJ—R by 4 % per 100 years) are observed for the period 1970—2017 (due to temperature growth during warm season; especially in August). Temperature amplitude in the 20th century and at the beginning of the 21st century decreases by –0.50.2 °Ñ during 100 years; and during the period 1970—2017 increases intensively by 1.1 ± 0.6 °Ñ during 100 years. Some trend of the shift of the phase of seasonal temperature fluctuations under the influence of climate changes exists because the phase has displaced by 1.9 ± 1.1 days during later seasons as a whole for the territory of Ukraine.
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