Isotopic signature of precipitation in the Elbrus region

Ju. N. Chizhova; V. N. Mikhalenko; S. S. Kutuzov; K. A. Shukurov; A. V. Kozachek

doi:10.31857/S2076673423010052

Isotopic signature of precipitation in the Elbrus region

Ju. N. Chizhova, V. N. Mikhalenko, S. S. Kutuzov, K. A. Shukurov, A. V. Kozachek

https://doi.org/10.31857/S2076673423010052

Full Text:

Abstract

The aim of the work was to study the isotopic characteristics of precipitation to establish the dependence of δ¹⁸O values on temperature at the time of precipitation and to get closer to understanding the processes that form the isotopic signature of the Elbrus snow cover and glacial ice. The sampling of precipitation was organized at Azau station, located at the foot of Elbrus at an altitude of 2300 m for the period from May 01.2019 to September 27.2021. The sampling was carried out once a day at 9:00 Moscow time. The air temperature was recorded at the meteorological station in the Terskol village (Roshydromet station No. 4334250). To study the main features of long-range air transport and possible sources of moisture, 5-day back trajectories were reconstructed using the NOAA HYSPLIT_4 trajectory model. The results showed that precipitation in the Elbrus region in winter was associated with the prevailing transfer from the Atlantic, in summer – with the predominance of transfer from the regions of Central Europe, the Mediterranean and Black Seas. The Mediterranean Sea in all seasons was the area from which the air and moisture were transferred to Elbrus. The values of δ¹⁸О and δ² Н of precipitation varied from 0.52 to −28.22‰ and from 16.3 to −224.1‰, respectively, revealing regular seasonality with high values of δ¹⁸О and δ² Н in summer and low in winter. The deuterium excess varied over a wide range from 24.8 to −14.6‰. All obtained values of δ¹⁸О and δ² Н were approximated by the equation δ² Н = 8δ¹⁸О + 7.06 (R2 = 0.98), which was close to the global meteoric water line. In general, for 2 years of observations, the relationship between the δ¹⁸О values of precipitation and the temperature of the surface air layer was expressed as 0.85‰/°С. Total mean absolute error in the reconstruction of air temperatures from the δ¹⁸О value of precipitation was 3.2°С due to objective reasons and also differences in meteorological conditions of two years of observations.

Keywords

oxygen isotope composition, hydrogen isotope composition, precipitation, Caucasus, Elbrus, temperature reconstruction,

About the Authors

Ju. N. Chizhova

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Science; Institute of Geography, Russian Academy of Science
Russian Federation
Moscow

V. N. Mikhalenko

Institute of Geography, Russian Academy of Science
Russian Federation
Moscow

S. S. Kutuzov

Institute of Geography, Russian Academy of Science
Russian Federation
Moscow

K. A. Shukurov

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences
Russian Federation
Moscow

A. V. Kozachek

Arctic and Antarctic Research Institute
Russian Federation
St. Petersburg

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Supplementary files

For citation: Chizhova J.N., Mikhalenko V.N., Kutuzov S.S., Shukurov K.A., Kozachek A.V. Isotopic signature of precipitation in the Elbrus region. Ice and Snow. 2023;63(1):33-47. https://doi.org/10.31857/S2076673423010052

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