Glacier change on the Koryak Highlands, north-east Asia, between 1972 and 2019 | Geosphere Research. 2025. № 2. DOI: 10.17223/25421379/35/6

Glacier change on the Koryak Highlands, north-east Asia, between 1972 and 2019

The availability of satellite imagery offers the opportunity to view glacier changes for remote and inaccessible regions such as the Koryak Highlands (Northeastern Russia). In this study, multi-annual fluctuations of glacier area for this region were assessed for the period 1972-2019 based on different satellite images. Since study of the glaciers in the 20th century in this region was scarce and contradictory, the character of glacier changes and its relation to climate are poorly understood. There are not enough reliable data in the USSR Glacier Inventory compiled in the end of 1960s for this region, therefore a reassessment is necessary. For this purpose, Corona images offer a valuable opportunity to map margins of the glaciers around the 1970s. The state of glaciers in 2019 was obtained based on Sentinel-2 images. As a result, over the period from 1972 to 2019, the total surface area of glaciers in the Koryak Highlands decreased by almost half: from 85.1 ± 0.9 km2 in 1972 to 38.9 ± 0.8 km2 in 2019. The mean rate of area change was 0.98 km2 yr-1 over the study period. The surface area loss of each glacier for 1972-2019 ranged from 14.3 to 81.4 %. Glaciers with an area of less than 0.2 km2 lost on average 63.7% of their area. Glaciers with an area of 0.2 to 0.5 km2 and from 0.5 to 0.1 km2 lost 58.1 % and 53.9 % of their area, respectively, over the same period. The largest glaciers (more than 1 km2) lost the least area (on average, 46.2 %). Glaciers with eastern, northeastern and southwestern aspects lost respectively 61.8 %, 60.4 % and 63.5 % of their area, while glaciers with northern, northwestern and western aspects lost respectively, 58.5 %, 56.6 % and 57.2 % of their area for 1972 to 2019. The small glaciers, which are few in number of the southern aspect showed the least area loss (on average, 47.4 %). The degree of the glaciers preservation even with significant reduction in area points at more important role of the orographic factor (relief features) compared to climatic one. Glaciers of the Koryak and Chukotka highlands demonstrate approximately the same rate of reduction in percentage for the entire period from 1972/75 to 2019. However, compared to the glaciers of the Sredinny Range on Kamchatka, glaciation in the Koryak and Chukotka Highlands decreased faster. Contribution of the authors: the authors contributed equally to this article. The authors declare no conflicts of interests.

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Keywords

Northeastern asia, Koryak Highlands, mountain glaciers, remote sensing, glacier change, climate change

Authors

Name	Organization	E-mail
Ananicheva Maria D.	Institute of Geography, RAS	maranan@gmail.com
Kononov Yury M.	Institute of Geography, RAS	jukon02@mail.ru

Всего: 2

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