Abstract
Warmer climate caused a large complex of effects that appeared in every link of the global hydrological cycle. In most cases, these changes have a non-linear nature and occur with different intensity in hydrological and meteorological systems. Therefore, it is important to study such processes together, which will allow simultaneous detection of their mutual effects. The water balance method, when all components are calculated in the same dimensions (mm), and then compared with each other, is best suited for solving such a problem. The increase in air temperature by 1,2°C caused significant changes in the overall structure of the Horyn River basin water balance: an increase in the expenditure parts uncertainty for the water balance components for the modern period 1991-2020. The closure error increase occurs mainly due to the cost part and its main component of total evaporation. According to Mali Vykorovychi hydrological gauge notes a decrease in the annual precipitation by 18 mm, river runoff by 21 mm, and an increase in total evaporation by 35 mm in absolute values. In the 1961-1990 according to the calculation of climatic water balance, the moisture accumulation prevailed over its utilization almost in 5 times but now, due to the increase in air temperature, their ratio has almost leveled off. Today river water regime almost moved from the excessively moistened to sufficiently moistened, and there are trends indicating the moisture consumption processes dominance in the basin over its accumulation.
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