Assessment of the century-long and current trends in the change in the amount of precipitation in the Nakhichevan Autonomous Republic of Azerbaijan

Some issues of assessing the century-long and current state of the amount of atmospheric precipitation in the territory of the Nakhichevan Autonomous Republic of Azerbaijan are considered. Brief general information about this area is given. To assess the century-long tendency in the amount of atmospheric precipitation in the Nakhichevan hydrometeorological station, used the annual amount of atmospheric precipitation for the period 1891–2015. A graph of the dynamics of the annual amount of atmospheric precipitation, as well as the straight-line and curved-line trends in the series of this element, which characterise the features of the considered dynamics for 1891–2015, is presented. An assessment of possible changes in the annual amount of atmospheric precipitation for different climatic periods (1891–1910, 1911–1940, 1941–1971, 1972–2015) in the Nakhichevan hydrometeorological station is also presented. Taking into account the variability of annual precipitation in a large range, the frequency of occurrence of various gradations of this indicator for 1891–2015 was calculated. Due to the fact that the territory of the region under consideration has a complex relief, the values of the vertical gradients of atmospheric precipitation by months were calculated. Using the equations of relationship, the calculations of the annual amount of atmospheric precipitation for different heights are carried out and a comparison with the corresponding values is carried out. The results of calculations and assessment of the corresponding changes are presented.