МӨСТӨЛГИЙН ОЛОН ЖИЛИЙН ДИНАМИК ӨӨРЧЛӨЛТ ...

In this study we used NDSI (Normalized Diffurence Snow Index) and NDPCSI (Normilized Diffirence Principel Component Snow Index) methods. NDSI is more common approach in order to determine snow cover map or glacier area. NDPCSI approach had been used to determine tha glacier area since 2015. In this study, we aim to demonstrate not only glacier area, but also establish the distribution of glacier area by aspect and elevation. We select the four glaciated mountains with different characteristics in order to delineate the glacier area. Munkhkhairkhan is the biggest glaciated mountain of the other three study sites. Sutai southest glacier of Mongolia, on the contrary, Munkhsaridag northest glacier of Mongolia. Otgontenger is one of the glaciated mountains of the Khangai mountainues range. During the research period, the Munkhkhairkhan mountain glacier area decreased by 22.1 km2 between 1993-2019. In Sutai, the glacier area declined by 7.8 km2 between 1988-2020. Munkhsaridag declined by 1.15 km2 between 1989-2020, and Otgontenger was dropped by 2.7 km2 glacier area 1988-2020, respectively. Hence, as the elevation distribution, the Munkhkhairkhan mountain glacier is often distributed over at the 3600-4100 m altitude, the Sutai mountain glacier are at 3700-4200 m, and the Munkhsaridag mountain glaciers are at 3100-3400 m, respectively. Despite this, the Otgontenger glacier dispersion has transformed every year.