KASHKATASH GLACIER FLUCTUATIONS IN THE XVII–XXI CENTURIES FROM CARTOGRAPHIC, DENDROCHRONOLOGICAL AND LICHENOMETRIC DATA

• Published in: Ice and Snow
• Main Authors: I. Bushueva S., O. Solomina N., И. Бушуева С., О. Соломина Н.
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: IGRAS 2015
• Subjects: Dendrochronology; glacier fluctiuations; lichenometry; remote sensing; repeated photographs; Дендрохронология; дистанционные методы; колебания ледников; лихенометрия; повторное фотографирование; Eros; Arctic
• Online Access: https://ice-snow.igras.ru/jour/article/view/234; https://doi.org/10.15356/2076-6734-2012-2-121-130

We focused our study on the retreat of a typical valley glacier Kashkatash, located in the Elbrus Area. We compared the old photographs of the glacier forefields (H. Burmester, 1911; H. Altberg, 1927; E.N. Lukasheva, 1932; unknown author, 1939) with the aerial photograph of 1957, 1965, 1987, maps of scale 1:100 000 (1890) and 1:25 000 (1950s), satellite images (CORONA of 1971, ASTER of 2005, EROS of 2006), oblique photographs taken in 1980s–2000s and plans, created by different researches. Using cartographic material and old photographs we reconstructed 14 positions of glacier tongue over the last 120 years. We estimated the linear glacier retreat and the age of numerous stadial moraines basing on geomorphic, tree-ring and lichenometric data and correlated our results with previous sparse glacier fluctuation reconstructions in this region. We identified at least 13 end moraines within the distance of 900 meters from the up-to-date glacier front position. The minimum age of the outer moraine is 450 years according to the tree-ring data. One tree growing on this moraine was damaged by a boulder falling down from a younger moraine under formation in the period from autumn 1839 to spring 1840. Three moraines were deposited in 1870s–1890s. In 20th century the glacier advanced in 1910-s, 1920-s, and 1970–1980-s. Реконструированы колебания долинного ледника Кашкаташ в Приэльбрусье за последние 400 лет. Проведено сравнение фотографий предполий ледника 1911, 1927, 1932 и 1939 гг., карт масштаба 1:100 000 (1890 г.) и 1:25 000 (1950-е годы), космических снимков 1971, 2005 и2006 г., фотографий конца XX – начала XXI вв. и планов, составленных разными исследователями. На основе этих материалов реконструировано 14 положений языка ледника за последние 120 лет. Оценены линейное отступание и возраст многочисленных стадиальных морен по геоморфологическим, дендрохронологическим и лихенометрическим данным. Согласно дендрохронологическим исследованиям, минимальный возраст внешней морены ледника Кашкаташ – 450 лет. На эту морену ...