Current glaciation of the Chikhachev ridge (South-Eastern Altai) and its dynamics after maximum of the Little Ice Age

• Published in: Ice and Snow
• Main Authors: D. A. Ganyushkin, K. V. Chistyakov, E. P. Kunaeva, I. V. Volkov, D. V. Bantsev
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: Nauka 2016
• Subjects: аридный климат; динамика ледников; ледники; малый ледниковый период; юго-восточный алтай; Science; Q; taiga
• Online Access: https://doi.org/10.15356/2076-6734-2016-1-29-42; https://doaj.org/article/5fa993b54a8949219f851aff75547e26

Glaciation of the Chikhachev ridge (South-Eastern Altai) remains poorly known: field observations were not performed since the mid-twentieth century, available schemes and estimates of the glaciation and its scale made on the basis of remote sensing cover only a part of the glaciers, reconstructions of the Little Ice Age (LIA) glaciations are absent. This research was based on interpretation of the satellite images: Landsat-4 (1989), Landsat-7 (2001), and Spot-5 (2011), as well as with the use of data of the field season of 2015. Characteristics of glaciations of the Chikhachev ridge as the whole and of its individual centers (Talduair massif, Mongun-Taiga-Minor massif, and southern part of the Chikhachev ridge) were determined for the first time. Recent glaciation is represented by 7 glaciers with their total area of 1.12 km2 in the Talduair massif, by 5 glaciers with total area of 0.75 km2 in the Mongun-Taiga-Minor massif, and by 85 glaciers with total area of 29 km2 in the southern part of the Chikhachev ridge. Since the LIA maximum, areas of glaciers decreased by 61% in the Talduair massif, by 74% in the Mongun-Taiga-Minor massif, by 56% in the southern part of the Chikhachev ridge with simultaneous lifting of the firn line by 50 m, 65 m, and 70 m, respectively.The largest rates of the glacier contractions were determined for the period 1989–2011. Different mechanisms of the glacier retreats were shown by the example of the glacier complexes Burgastyn-Gol (one-sided retreat and disintegration) and the Grigorjev glacier (gradual retreat of the tongue). Retreat of the Grigorjev glacier has been reconstructed for the period from the LIA maximum until 2015. Average rate of the retreat increased from 1,6 m/year in 1957–1989 up to 11,3 m/year in 2011–2015. The present-day scales of the glaciers and rates of their retreating do not significantly differ from estimations made by other researchers for the nearest centers of glaciation of the Altai arid part. Stabilization of the temperature against the background of ...