Recent Mass Balance Anomalies on the Djankuat Glacier, Northern Caucasus

Popovnin, V.; Gubanov, A.; Lisak, V.; Toropov, P.

Авторы: Popovnin V., Gubanov A., Lisak V., Toropov P.
Журнал: Atmosphere
Том: 15
Номер: 1
Год издания: 2024
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 107
Последняя страница: 129
DOI: 10.3390/atmos15010107
Аннотация: A 54-year-long series of continuous instrumental measurements of mass balance andits main components has already been accumulated at the Djankuat Glacier, which is representativeof the Caucasus and the most studied glacier in Russia. The anomalies of these indicators in2017/2018–2020/2021 were evaluated against an analysis of meteorological reasons that predeterminedthem. Each of the four balance years under consideration represents a particular anomalyof varying severity. As for conditions of mass income, three years saw accumulation higher thanaverage, and in one year (2018/2019) it approached the norm. As for summer ablation conditions,similarly, in one season (2019) the melting differed from the average only slightly, but in the otherthree it was much higher. Consequently, in one year (2020/2021) the state of the glacier was close tonormal, in another (2017/2018) the budget situation was much more favorable for Djankuat, and inthe other two the final losses significantly exceeded the average annual mass loss rate. At the sametime, in 2019/2020, an absolute record of ablation since the beginning of monitoring in 1967/1968was recorded (4360 mm w.e.). Nevertheless, although negative mass balance values continue to berecorded annually, signs of an inevitable slowdown in the rate of glacier degradation in the Caucasushave appeared in the last 4-year-long period: the continued growth of winter snow accumulationoverlaps the ongoing intensification of summer melting. The growth of debris cover in terms of areaand thickness also affects this mass loss slowdown to some extent. This inhibits ablation, exerting aheat-insulating effect. Because of this, the congruence of mass balance parameters vs. altitude curvesis distorted. Also, a tendency toward increasing annual glacier mass turnover was revealed for thelast half-century. This fact gradually increases the energy of glaciation and indirectly indicates aweakening of continentality in the climate of the Caucasian highlands.
Добавил в систему: Торопов Павел Алексеевич

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Recent Mass Balance Anomalies on the Djankuat Glacier, Northern Caucasusстатья

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