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Article

Optical, Geochemical and Mineralogical Characteristics of Light-Absorbing Impurities Deposited on Djankuat Glacier in the Caucasus Mountains

1
Institute of Geography, Russian Academy of Sciences, 119017 Moscow, Russia
2
Faculty of Geography and Geoinformation Technologies, National Research University Higher School of Economics, 101000 Moscow, Russia
3
Department of Geography and Environmental Science, University of Reading, Whiteknights RG6 6AB, UK
4
Institute of Geology of Ore Deposits, Petrology, Mineralogy and Geochemistry of the Russian Academy of Sciences, 119017 Moscow, Russia
*
Author to whom correspondence should be addressed.
Academic Editors: Nikolay Kasimov, Tatiana Minkina, Ivan Semenkov and Carla Sofia Santos Ferreira
Water 2021, 13(21), 2993; https://doi.org/10.3390/w13212993
Received: 12 August 2021 / Revised: 17 October 2021 / Accepted: 19 October 2021 / Published: 22 October 2021
(This article belongs to the Special Issue Geochemistry of Landscape and Soil)
Supra-glacial material, including light-absorbing impurities (LAI) such as mineral dust of crustal and soil origin, black carbon, algae and cryoconite, reduce the reflectance of snow and glacier ice. The reduction depends on the amount of LAI and their physical and chemical properties, which vary spatially and temporally. Spectral reflectance data and snow and ice samples, containing LAI, were collected in the ablation zone of the Djankuat Glacier, Central Caucasus, Russia. The spectra of the samples containing mineral dust transported from deserts were characterized by negative visible near-infrared gradients and were different from the spectra of clean aged snow and exposed glacier ice and from the samples containing mineral dust produced locally. Geochemical and mineralogical analysis using X-ray diffraction and X-ray fluorescence spectrometry showed that samples containing desert dust were characterised by a high proportion of clay materials and such minerals as smectites, illite–smectites and palygorskite and by a smaller size of mineral particles. They were enriched in chromium, zinc and vanadium. The latter served as an indicator of dust transport over or origin from the oil-producing regions of the Middle East. There was a strong negative correlation between the amount of organic matter and mineral dust in the collected samples and the albedo of surfaces from which the samples were collected. The results suggested that organic matter reduced albedo more efficiently than mineral dust. The study highlighted the importance of supra-glacial material in changing the surface reflectivity of snow and glaciers in the Caucasus region. View Full-Text
Keywords: light-absorbing impurities; mineral dust; spectral reflectance; albedo; glaciers; Caucasus light-absorbing impurities; mineral dust; spectral reflectance; albedo; glaciers; Caucasus
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MDPI and ACS Style

Kutuzov, S.; Shahgedanova, M.; Krupskaya, V.; Goryachkin, S. Optical, Geochemical and Mineralogical Characteristics of Light-Absorbing Impurities Deposited on Djankuat Glacier in the Caucasus Mountains. Water 2021, 13, 2993. https://doi.org/10.3390/w13212993

AMA Style

Kutuzov S, Shahgedanova M, Krupskaya V, Goryachkin S. Optical, Geochemical and Mineralogical Characteristics of Light-Absorbing Impurities Deposited on Djankuat Glacier in the Caucasus Mountains. Water. 2021; 13(21):2993. https://doi.org/10.3390/w13212993

Chicago/Turabian Style

Kutuzov, Stanislav, Maria Shahgedanova, Viktoria Krupskaya, and Sergey Goryachkin. 2021. "Optical, Geochemical and Mineralogical Characteristics of Light-Absorbing Impurities Deposited on Djankuat Glacier in the Caucasus Mountains" Water 13, no. 21: 2993. https://doi.org/10.3390/w13212993

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