The article presents a detailed pattern of the spatio-temporal distribution of the De Martonne aridity index in Ukraine. The distribution of climate types by this indicator at the weather stations of Ukraine is also presented. The De Martonne aridity index has been statistically analyzed at 187 weather stations in Ukraine. The dependences of De Martonne aridity index on the elevation of the station above the sea level, its geographic latitude and longitude were estimated. The overall contributions of each of these characteristics to total variance of this indicator were also evaluated. Scatterplots of the index of aridity depending on location's coordinates are presented. The long-term trend of this indicator for the period from 1931 to 2010 has been studied on the example of weather stations that represent the plain part of Ukraine: Lviv (west), Kyiv (north), Poltava (east), Uman (center) and Kherson (south). It has been shown that the humidification regime of Ukraine for the period under consideration has insubstantially changed, but the tendency towards aridization is still prevailing. This statement is fully consistent with the results of previous studies. The map of De Martonne aridity index for the standard climatological period 1961-1990 and modelling results of its geographical distribution using linear regression equations are presented. It was noted that the three-factor model of multiple regression this indicator for the plain stations of Ukraine may have the greatest theoretical value. The average absolute error (2 units) and average relative error (6.2%) of the estimation of the De Martonne aridity index were determined. It was established that the dynamics of the De Martonne aridity index over the past 50 years has been consistent with the dynamics of the change in the hydrothermal coefficient of Selyaninov. It was concluded that climate of Ukraine has a weak tendency to increasing of aridity, which has certain risks to development of agricultural sector.
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