Modern and ancient glaciation of northern slope of the Tavan-Bogdo-Ola massif

Москаленко, И. Г.; Ганюшкин, Д. А.; Чистяков, К. В.

doi:10.15356/2076-6734-2013-3-33-44

Cited by 5 publications

(5 citation statements)

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“…The Kalguty MIS 2 ELA at c . 2750 m is close to the values of the nearby Tsagaan Gol‐Potanin and the more distant Mongun‐Taiga, and to the value of 2735 m for the Tavan Bogd north side proposed by Moskalenko et al (2013) but their LIA ELA is 180 m lower than proposed by Ganyushkin et al (2018b). The variability of the MIS 2 ELAs in Altai ( c .…”

Section: Discussionsupporting

confidence: 81%

“…The weighted mean value for our reconstructed LIA ELA in the upper Kalguty basin is 3235 m asl (Table 4), close to the mean value of 3275 m given by Ganyushkin et al (2015). The Kalguty MIS 2 ELA at c. 2750 m is close to the values of the nearby Tsagaan Gol-Potanin and the more distant Mongun-Taiga, and to the value of 2735 m for the Tavan Bogd north side proposed by Moskalenko et al (2013) but their LIA ELA is 180 m lower than proposed by Ganyushkin et al (2018b). The variability of the MIS 2 ELAs in Altai (c. 350 m) is slightly higher than the present one (c. 200 m).…”

Section: Elas In the Altai Mountains Since Missupporting

confidence: 74%

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Timing and extent of glaciation since the Last Glacial Maximum in the upper Kalguty basin, Russian Altai Mountains

Deline

Ravanel

Delannoy

et al. 2023

J Quaternary Science

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The mountains systems of Central Asia are primary targets to study late Pleistocene climate evolution given their location at the crossroads of several atmospheric circulation systems. The timing of glacier extent during this period remains understudied, especially in the Altai Mountains. Here, we have reconstructed glacier extent during three main Late Pleistocene stadials in the upper Kalguty basin (south‐eastern Russian Altai) based on field‐based geomorphic analysis. Additionally, surface exposure dating with 10Be and 26Al at a key site was used to infer a minimum‐limiting age for the outermost well‐preserved Pleistocene frontal moraine system and to date the inception of glacier withdrawal. According to our data, around 20.6 ± 1.8 ka Kalguty Glacier was still 200 m thick at the key site, 10 km upstream of the outermost moraine, and the site was totally deglaciated shortly after 20.4 ± 0.4 ka. These results point to a rapid retreat of this low‐gradient valley glacier after its probably MIS 2 maximum which was prior to 21 ka and probably prior to 22.5 ka. Two other glacier stages have been identified upvalley, characterized by a depression of the equilibrium‐line altitude of 420 and 314 m with respect to the Little Ice Age, thus corresponding to Lateglacial advances. Our glacier reconstruction further provides a geomorphological and geochronological background to put into context archaeological findings in this area.

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Section: Discussionsupporting

confidence: 81%

Section: Elas In the Altai Mountains Since Missupporting

confidence: 74%

Timing and extent of glaciation since the Last Glacial Maximum in the upper Kalguty basin, Russian Altai Mountains

Deline

Ravanel

Delannoy

et al. 2023

J Quaternary Science

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“…Since 1999, the glaciation has been continuously studied by our research group [49][50][51]. The largest valley glaciers Argamgi-3 and Argamgi-2 have been in situ observed the longest, as such observations began in 1984.…”

Section: Methodsmentioning

confidence: 99%

Present Glaciers and Their Dynamics in the Arid Parts of the Altai Mountains

et al. 2017

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This research is based on multiyear in-situ observations, analysis of satellite and aerial imagery, meteorological data, and mass balance index calculations. Presently, 659 glaciers cover a total area of 322.1 km 2 . We identified four favorable, two neutral, and five unfavorable longer intervals of glacier development since 1940. A decelerating of glacial retreat took place in the 1960s and in the late 1980s/early 1990s. The strong decline in glacial mass between 1995 and 2009 resulted in a fast reduction of the glacial area (0.9% year −1 on the northern slope of Tavan Bogd, 1.5% year −1 at Mongun-Taiga), mostly due to the degradation of small glaciers; after 2009, the glacial loss slowed down. Large valley glaciers behaved asynchronously until recently, when their retreat accelerated rapidly reaching in some cases over 40 m·year −1 . Degradation of the accumulation zone and separation of the debris-covered parts of the glaciers are characteristic for the glacial retreat in the region of research. The time of reaction of the fronts of four valley glaciers of Mongun-Taiga and the northern slope of Tavan Bogd on climatic fluctuations is estimated between 11 and 20 years. Over the next decade, high rates of glacial degradation are expected.

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“…Территория ЮгоВосточного Алтая отли чается аридным климатом и относится к проб лемной с точки зрения обеспечения водны ми ресурсами, поэтому исследование условий формирования стока высокогорных рек с помо щью новых методов вызывает особый интерес . Этот регион уже несколько лет представляет собой объект исследования географов Санкт Петербургского государственного университе та [2][3][4] . Первые изотопные исследования лед ников и рек предприняты нами с 1 по 16 августа 2013 г .…”

Section: Introductionunclassified

Formation of glacier runoff on the northern slope of Tavan Bogd mountain massif based on stable isotopes data

et al. 2018

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This investigation is based on measurements of stable isotopes concentrations (δD and δ18О) in water, snow and ice samples. Glaciers are composed of ice, snow, and fi n of atmospheric origin. The isotopic composition of these components is different, so when melting they form the melted glacial water with different isotope characteristics. Summer precipitation contains the heaviest isotopes, but only a small part of them remains on the glacier. The average isotopic composition of glacier ice represents the average composition of precipitation that accumulates on it. However, snow and fi n of different seasons can occur on the glacier surface, the isotopic composition of which differs from the isotopic composition of glacier ice. At different times of the ablation season different parts of the glacier melt, therefore the isotopic composition of melt waters will be different. Differences in the isotopic composition of the major runoff-forming components on the Northern slopes of the massif Tabyn-Bogdo-Ola had been identified. A part of melting ice in the formation of the runoff on this massif is determined by estimation of the isotopic composition of snow, ice, and fi n on different glaciers of this region. The average δ18О of snow on the glacier surface is −11.9‰, and this snow can be attributed to the precipitation fallen in late spring or early summer. Measured average isotopic composition of precipitation (δ18О = −11.9‰) was compared with the online calculator of the isotope content in precipitation (OIPC). The isotopic composition of glacial melt waters on the Northern macro-slope in the middle of July 2015 (δ18О = −15.3‰) differs from the isotopic composition of the territory of the Mongolian part of the massif (δ18О = −17.4‰) obtained from results of the analysis of eight samples taken at different edges of the glaciers at the beginning of August 2013. Isotopic separation shows important role of summer snow in feeding the glacial rivers of the massif even in the middle of the ablation season, especially for glaciers in the central part of the massif. The role of seasonal snow in feeding the glacier streams depends on the morphological type of glacier. It is maximum for corrie glaciers and minimum for the valley ones.

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Modern and ancient glaciation of northern slope of the Tavan-Bogdo-Ola massif

Cited by 5 publications

References 0 publications

Timing and extent of glaciation since the Last Glacial Maximum in the upper Kalguty basin, Russian Altai Mountains

Timing and extent of glaciation since the Last Glacial Maximum in the upper Kalguty basin, Russian Altai Mountains

Present Glaciers and Their Dynamics in the Arid Parts of the Altai Mountains

Formation of glacier runoff on the northern slope of Tavan Bogd mountain massif based on stable isotopes data

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