DYNAMICS OF GLACIATION OF THE MONGOLIAN ALTAI RIDGE (CASE STUDY OF THE TSAGAN-SALA-GOL RIVER BASIN)
Based on the interpretation of the Landsat and ASTER space images (spatial density of 14.25-15 m in pixel), it has been revealed that the area of the present glaciation of the Tsagan-Sala-Gol River basin is 60.18 km<sup>2</sup>. In 2015 there were 30 glaciers on this territory. In the software ArcGIS and ENVI, their contours were identified, and the lengths and areas were measured in 1994, 2000, 2001, 2006, 2010 and 2015. It was revealed that the total area of glaciation of the basin from 1994 to 2015 decreased by 2.56 km<sup>2</sup>. The greatest changes occurred on glaciers of a complex valley type with an area of more than 3 km<sup>2</sup>. On four glaciers with an area of less than 0.56 km<sup>2</sup> located on the slopes of the northern and north-eastern exposition, no area changes were identified.