LONG-TERM DYNAMICS AND SEASONAL CHANGES OF HYDROCHEMISTRY OF ISSYK-KUL LAKE BASIN, KYRGYZSTAN
Asankulov T., Abduvaili Ts., Isanova G., Long M., Duulatov E. Long-term Dynamics and Seasonal Changes of Hydrochemistry of Issyk-Kul Lake Basin, Kyrgyzstan // Arid ecosystems. 2019. V. 25. № 1 (78). P. 79-87. | PDF
The Issyk-Kul Lake is one of the largest highland and brackish lakes in the world in continental origin. Assessment and analysis of the long-term dynamics on the chemical composition and salinity of water in the Issyk-Kul Lake basin was carried out according to the data for 1928, 1932, 1960, 1977, 1980, and 1986, 2000 and 2014. Sulfates, chlorides, sodium and magnesium are the predominant ions of the lake water. Na+ and Mg+ predominate from the cations, and from the anions are Cl— and SO42—. The sulfates predominate in the chemical composition of water, and the lake water belongs to the sulfate class and to the chloride-sulphate-sodium-magnesium type of mineralization. The content of the main ions such as sodium and potassium and other ions in the lake waters in comparison with 1932 and 1986 shows a slight increase. A slight change in the content of ions and water mineralization in general indicates the presence of good water exchange between its individual water sections and the propagation of vertical circulation of water masses to the very bottom. The salinity of the lake water from 1928 to 2014 increased from 5.823 to 6.22 g/l respectively. This might be explained by much less incoming part of the water balance and insignificant evaporation. The water in the lake has an alkaline reaction and the pH of the lake water was within 7.95-8.82 in 2015. The study of the hydrochemistry of natural waters is of great practical importance in various branches of the economy. Since the chemical composition of water is taken into account when using natural waters for all types of water supply and water use. The importance of hydrochemical research is also increasing due to pollution of water bodies and anthropogenic activities.
Keywords: Issyk-Kul Lake, hydrochemistry, ion, salinity, Kyrgyzstan.