Analysis of climate variables in the upper Amu Darya river basin in Tajikistan

This article presents the results of the trend analysis of precipitation, maximum and minimum temperatures in the upstream of Amu Darya River Basin in Tajikistan. The result showed that in the south part of Tajikistan the trend of the summer and winter seasons indicate a positive and the temperature rises in summer and winter. In the north and central part of Tajikistan, there is also a positive trend in summer and winter with the exception of the Rasht and Murgab stations, where was recorded a decreasing trend in air temperature in summer. The eastern part of Tajikistan, where the high-altitude territory begins, the temperature trend shows that the summer period of the year becomes slightly cooler, and the winter period shows an increasing temperature trend, i.e. it is getting warmer. On the flat plain areas of Tajikistan, a relative increase in precipitation is observed, and the amount of precipitation in the high-mountain zone (eastern Pamir) decreases according to long-term data. This study shows pronounced climatic fluctuations in Tajikistan, changes in air temperature and precipitation conditions.