Chalaati Glacier variations in the past centuries, Georgian Caucasus, based on Dendrochronological and Beryllium-10 data
Glacier variations over the past centuries are still poorly documented on the southern slope of the Greater Caucasus. In this paper, the change of Chalaati Glacier in the Georgian Caucasus from its maximum extent during the Little Ice Age has been studied. For the first time in the history of glacio...
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| Format: | Article |
| Language: | Russian |
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Nauka
2020-08-01
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| Series: | Лëд и снег |
| Online Access: | https://ice-snow.igras.ru/jour/article/view/769 |
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| author | Levan G. Tielidze Olga Solomina Vincent Jomelli Ekaterina Dolgova Irina Bushueva Vladimir Mikhalenko Regis Braucher ASTER Team |
| author_facet | Levan G. Tielidze Olga Solomina Vincent Jomelli Ekaterina Dolgova Irina Bushueva Vladimir Mikhalenko Regis Braucher ASTER Team |
| author_sort | Levan G. Tielidze |
| collection | DOAJ |
| description | Glacier variations over the past centuries are still poorly documented on the southern slope of the Greater Caucasus. In this paper, the change of Chalaati Glacier in the Georgian Caucasus from its maximum extent during the Little Ice Age has been studied. For the first time in the history of glaciological studies of the Georgian Caucasus, 10Be in situ Cosmic Ray Exposure (CRE) dating was applied. The age of moraines was determined by tree-ring analysis. Lichenometry was also used as a supplementary tool to determine the relative ages of glacial landforms. In addition, the large-scale topographical maps (1887, 1960) were used along with the satellite imagery - Corona, Landsat 5 TM, and Sentinel 2B. Repeated photographs were used to identify the glacier extent in the late 19th and early 20th centuries. 10Be CRE ages from the oldest lateral moraine of the Chalaati Glacier suggest that the onset of the Little Ice Age occurred ~0.74 - ~0.62 kyr ago (CE ~1280-1400), while the dendrochronology and lichenometry measurements show that the Chalaati Glacier reached its secondary maximum extent again about CE ~1810. Since that time to 2018 the glacier area decreased from 14.93±1.45 km2 to 9.89±0.50 km2 (33.75±7.4% or ~0.16 yr-1), while its length decreased by ~2280 m. The retreat rate was uneven: it peaked between 1940 and 1972 (~22.5 m yr-1), while the rate was slowest in 1910-1930 (~4.0 m yr-1). The terminus elevation rose from ~1620 m to ~1980 m in ~1810-2018. |
| format | Article |
| id | doaj-art-3ea2b078361f443cb41df5b79f82c8f0 |
| institution | Matheson Library |
| issn | 2076-6734 2412-3765 |
| language | Russian |
| publishDate | 2020-08-01 |
| publisher | Nauka |
| record_format | Article |
| series | Лëд и снег |
| spelling | doaj-art-3ea2b078361f443cb41df5b79f82c8f02025-08-04T14:07:47ZrusNaukaЛëд и снег2076-67342412-37652020-08-01603760Chalaati Glacier variations in the past centuries, Georgian Caucasus, based on Dendrochronological and Beryllium-10 dataLevan G. Tielidze0Olga Solomina1Vincent Jomelli2Ekaterina Dolgova3Irina Bushueva4Vladimir Mikhalenko5Regis Braucher6ASTER Team71Department of Geomorphology, Vakhushti Bagrationi Institute of Geography, Ivane Javakhishvili Tbilisi State University, 6 Tamarashvili st., 0177, Tbilisi, Georgia 2Antarctic Research Centre, Victoria University of Wellington, PO Box 600, 6140, Wellington, New Zealand 3School of Geography Environment and Earth Sciences, Victoria University of Wellington, PO Box 600, 6140, Wellington, New Zealand1Department of Glaciology, Institute of Geography of the Russian Academy of Sciences, 29 Staromonetniy Pereulok, 119017, Moscow, Russia 2Higher School of Economic, Moscow, Russia1CNRS, UMR 34 Aix-Marseille University- CNRS-IRD-Coll. France-INRA. 13545 Aix-en-Provence. France 2CNRS, LGP, Sorbonne University, Paris, 1 P. A. Briand, Meudon, FranceDepartment of Glaciology, Institute of Geography of the Russian Academy of Sciences, 29 Staromonetniy Pereulok, 119017, Moscow, RussiaDepartment of Glaciology, Institute of Geography of the Russian Academy of Sciences, 29 Staromonetniy Pereulok, 119017, Moscow, RussiaDepartment of Glaciology, Institute of Geography of the Russian Academy of Sciences, 29 Staromonetniy Pereulok, 119017, Moscow, RussiaCNRS, UMR 34 Aix-Marseille University- CNRS-IRD-Coll. France-INRA. 13545 Aix-en-Provence. FranceCNRS, UMR 34 Aix-Marseille University- CNRS-IRD-Coll. France-INRA. 13545 Aix-en-Provence. FranceGlacier variations over the past centuries are still poorly documented on the southern slope of the Greater Caucasus. In this paper, the change of Chalaati Glacier in the Georgian Caucasus from its maximum extent during the Little Ice Age has been studied. For the first time in the history of glaciological studies of the Georgian Caucasus, 10Be in situ Cosmic Ray Exposure (CRE) dating was applied. The age of moraines was determined by tree-ring analysis. Lichenometry was also used as a supplementary tool to determine the relative ages of glacial landforms. In addition, the large-scale topographical maps (1887, 1960) were used along with the satellite imagery - Corona, Landsat 5 TM, and Sentinel 2B. Repeated photographs were used to identify the glacier extent in the late 19th and early 20th centuries. 10Be CRE ages from the oldest lateral moraine of the Chalaati Glacier suggest that the onset of the Little Ice Age occurred ~0.74 - ~0.62 kyr ago (CE ~1280-1400), while the dendrochronology and lichenometry measurements show that the Chalaati Glacier reached its secondary maximum extent again about CE ~1810. Since that time to 2018 the glacier area decreased from 14.93±1.45 km2 to 9.89±0.50 km2 (33.75±7.4% or ~0.16 yr-1), while its length decreased by ~2280 m. The retreat rate was uneven: it peaked between 1940 and 1972 (~22.5 m yr-1), while the rate was slowest in 1910-1930 (~4.0 m yr-1). The terminus elevation rose from ~1620 m to ~1980 m in ~1810-2018.https://ice-snow.igras.ru/jour/article/view/769 |
| spellingShingle | Levan G. Tielidze Olga Solomina Vincent Jomelli Ekaterina Dolgova Irina Bushueva Vladimir Mikhalenko Regis Braucher ASTER Team Chalaati Glacier variations in the past centuries, Georgian Caucasus, based on Dendrochronological and Beryllium-10 data Лëд и снег |
| title | Chalaati Glacier variations in the past centuries, Georgian Caucasus, based on Dendrochronological and Beryllium-10 data |
| title_full | Chalaati Glacier variations in the past centuries, Georgian Caucasus, based on Dendrochronological and Beryllium-10 data |
| title_fullStr | Chalaati Glacier variations in the past centuries, Georgian Caucasus, based on Dendrochronological and Beryllium-10 data |
| title_full_unstemmed | Chalaati Glacier variations in the past centuries, Georgian Caucasus, based on Dendrochronological and Beryllium-10 data |
| title_short | Chalaati Glacier variations in the past centuries, Georgian Caucasus, based on Dendrochronological and Beryllium-10 data |
| title_sort | chalaati glacier variations in the past centuries georgian caucasus based on dendrochronological and beryllium 10 data |
| url | https://ice-snow.igras.ru/jour/article/view/769 |
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