Abstract
The paper compares remotely sensed glacier inventories of the Byrranga, Suntar-Khayata, and Chersky ranges (2003), Koryak Highland and Chukotka mountains (2008) with data from the Inventory of Glaciers of the USSR (1945–1985). We studied changes in glacier area since the Inventory, which was primarily based on aerial photos and field research. The glaciers have been classified by orientation (aspect) and morphological type. Overall the glacierization of the Chersky Range (1970–2003), Suntar-Khayata (1945–2003), Byrranga (1967–2003), Koryak Highland (1950–2003) and Meynypilginsky Range (1984–2008) reduced by about 30, 20, 15, 60 (debatable value) and 25% respectively due to summer temperature rise. Calculation of glacier volumes for the dates indicated in the USSR Glacier Inventory and satellite imagery: during this period in sum for 5 studied glacier regions the area, covered by ice, has decreased by 225.2 km², and ice volume – by 8.7 Gtg. Construction of spatial patterns (maps) of current ELA for 3 different by climate mountain regions – the Suntar-Khayata Mountains– Chersky Range, and Meynypilgynsky Range ( North Far East), showed that despite of retreat of the glaciers, the mean ELA change for the first studied region is not large compared with the data from the Glacier Inventory (100 m ), and significant for the second (100–150 m).
Highlights
We studied changes in glacier area since the Inventory, which was primarily based on aerial photos and field research
Calculation of glacier vol umes for the dates indicated in the USSR Glacier Inventory and satellite imagery: during this period in sum for 5 studied glacier regions the area, covered by ice, has decreased by 225.2 km, and ice volume – by 8.7 Gtg. Construction of spatial patterns (maps) of current ELA for 3 different by climate mountain regions – the Suntar‐Khayata Mountains– Chersky Range, and Meynypilgynsky Range (North Far East), showed that despite of retreat of the glaciers, the mean ELA change for the first studied region is not large compared with the data from the Glacier Inventory (100 m), and significant for the second (100–150 m)
Summary
Для определения современного распростране ния ледников северо‐востока Сибири необходимы снимки, когда ледниковый лёд свободен от снежно го покрова, а это очень короткий период – с конца июля до начала сентября, т.е. Сокраще ние площади этих ледников составило 40–50% (к 2003 г.), что по‐прежнем у дов ольно большая ве личина, но более реалистичная. Меньшие по площа ди ледники (каровые и карово‐висячие) потеряли соответственно меньшую площадь; максималь ная потеря площади характерна для ледников се веро‐восточной и северо‐западной экспозиций. Относитель ное сокращение площади велико и среди ледни ков южной, восточной и западной экспозиций для всех морфологических типов, но особенно для ка рово‐долинных и каровых ледников. Северная и северо‐восточная экспозиции отступивших ледников больше харак терн ы для сев ер о‐вост ок а Сиб ир и – ледн ик ов гор Сунтар‐Хаята и хр. Никитина площади ледников и объёмы льда для изучаемых ледниковых районов
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