Djankuat glacier station in the North Caucasus, Russia: a database of glaciological, hydrological, and meteorological observations and stable isotope sampling results during 2007–2017

Abstract

Abstract. This study presents a dataset on long-term multidisciplinary glaciological, hydrological, and meteorological observations and isotope sampling in a sparsely monitored alpine zone of the North Caucasus in the Djankuat research basin. The Djankuat glacier, which is the largest in the basin, was chosen as representative of the central North Caucasus during the International Hydrological Decade and is one of 30 “reference” glaciers in the world that have annual mass balance series longer than 50 years (Zemp et al., 2009). The dataset features a comprehensive set of observations from 2007 to 2017 and contains yearly measurements of snow depth and density; measurements of dynamics of snow and ice melting; measurements of water runoff, conductivity, turbidity, temperature, δ18O, δD at the main gauging station (844 samples in total) with an hourly or sub-daily time step depending on the parameter; data on δ18O and δ2H sampling of liquid precipitation, snow, ice, firn, and groundwater in different parts of the watershed taken regularly during melting season (485 samples in total); measurements of precipitation amount, air temperature, relative humidity, shortwave incoming and reflected radiation, longwave downward and upward radiation, atmospheric pressure, and wind speed and direction – measured at several automatic weather stations within the basin with 15 min to 1 h time steps; gradient meteorological measurements to estimate turbulent fluxes of heat and moisture, measuring three components of wind speed at a frequency of 10 Hz to estimate the impulse of turbulent fluxes of sensible and latent heat over the glacier surface by the eddy covariance method. Data were collected during the ablation period (June–September). The observations were halted in winter. The dataset is available from PANGAEA (https://doi.org/10.1594/PANGAEA.894807, Rets et al., 2018a) and will be further updated. The dataset can be useful for developing and verifying hydrological, glaciological, and meteorological models for alpine areas, to study the impact of climate change on hydrology of mountain regions using isotopic and hydrochemical approaches in hydrology. As the dataset includes the measurements of hydrometeorological and glaciological variables during the catastrophic proglacial lake outburst in the neighboring Bashkara valley in September 2017, it is a valuable contribution to study lake outbursts.

Modelling the evolution of Djankuat Glacier, North Caucasus, from 1752 until 2100 CE

“…Verhaegen et al: Evolution of Djankuat Glacier (1752-2100 Despite these rising concerns, however, modelling of Caucasian glaciers is scarce and has only been attempted in a few studies (e.g. Rezepkin and Popovnin, 2018;Belozerov et al, 2020).…”

“…The pronounced effect of debris should therefore not be ignored in numerical experiments to determine the future evolution of mountain glaciers, yet only few studies have included this complex process in time-dependent models (e.g. Jouvet et al, 2011;Rowan et al, 2015;Huss and Fischer, 2016;Kienholz et al, 2017;Rezepkin and Popovnin, 2018;Wirbel et al, 2018).…”

Causes and consequences of the streambed restructuring of the Koiavgan Creek (North Caucasus, Russia)

“…Meteorological data were collected for the period 2007-2017 from State weather stations Cheget and Terskol which are located around the study site. Also, information about precipitation in the Djankuat valley bottom near the Koiavgan Creek mouth was taken from the database compiled by Rets et al [7]. We used daily precipitation amount (in water equivalent).…”

“…In addition, the active landslide has been recorded in the place of future breakthrough based on interpretation of 2014 summer satellite image. Hydrological data including water and suspended sediment discharges in the upper reach of the Djankuat River for the 2015-2017 ablation season are also used for analysis (data was taken from the database [7]).…”

“…1), which flow into the Djankuat River. According to meteorological observations [7] the average daily precipitation (in water equivalent) is 11.2 mm•day 1 with a maximum of 97.2 mm•day 1 . The most part of precipitation falls in the cold season in the form of snow.…”