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Changes of northwestern Russian mountain glaciers from maximum of Neoglacial to middle of 20th century


, : Changes of northwestern Russian mountain glaciers from maximum of Neoglacial to middle of 20th century. Izvestiya Akademii Nauk, Rossiyskaya Akademiya Nauk, Seriya Geograficheskaya 1998(2): 53-63

Glacial size on Kodar range (23 glaciers), on Suntar Khayata range (37 glaciers), on Chersky range (52 glaciers), on Koryak plateau (63 glaciers) during the Little Ice Age were evaluated by the photo-interpretation method. For evaluation of the scale of glacial reduction from the Little Ice Age up to the middle of the recent century two characteristics were used: linear distance from moraine up to the glacier terminus (dl) and difference of absolute altitudes of the glacier terminus and moraine (dH). It is revealed, that in average these values differ in different regions: they are minimal on Kodar range, increasing on Suntar-Khayata, Chersky range and are largest on Koryak plateau. The same pattern is for medians and maximum retreat values. Under normalizing of mentioned values along the glacier length, the difference of Koryak plateau from the rest-studied regions remain the same. So, if for the ranges Suntar-Khayata and Chersky dl/L composes from 0,10 up to 0,18, for Koryak plateau this value increases up to 0,68. Relative retreat of terminus along the altitudes (dH/H comprises correspondingly), 0,18 for Kodar range, 0,038 for Suntar-Khayata, 0,057 for Chersky, and 0,15 for Koryak plateau, so differs from the other by an order. According to the few available data, maximum advance of glaciers in different mountain country can going on not simultaneously: on Kodar and Suntar-Khayata, probably near 300-400 years ago, on Koryak plateau, probably later, by analogy with Kamchatka, where the major part of glaciers had maximum size in the middle of last century.

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