Isotopic Signature of Precipitation in the Elbrus Region-Reference-Cited by-同舟云学术

Isotopic Signature of Precipitation in the Elbrus Region

Published:2023-01-01 Issue:1 Volume:63 Page:33-47
ISSN:2412-3765
Container-title:Journal "Ice and snow"
language:
Short-container-title:Lëd i sneg

Author:

Chizhova Ju. N.¹²,Mikhalenko V. N.²,Kutuzov S. S.²,Shukurov K. A.³,Kozachek A. V.⁴

Affiliation:

1. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Science

2. Institute of Geography, Russian Academy of Science

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

4. Arctic and Antarctic Research Institute

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 δ2Н 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 δ2Н 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 δ2Н were approximated by the equation δ2Н = 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.

Publisher

The Russian Academy of Sciences

Reference30 articles.

1. Vasil’chuk Yu.K., Chizhova Yu.N., Papesh V., Budantseva N.A. Altitude isotope effect in the snow on the Garabashi glacier in the Elbrus region. Kriosfera Zemli. Earth’s Сryosphere. 2005, 9 (4): 72–81 [In Russian].

2. Kozachek A.V., Ekaykin A.A., Mikhalenko V.N., Lipenkov V.Ya., Kutuzov S.S. Isotopic composition of ice cores obtained on the Western Plateau of Elbrus. Led i Sneg. Ice and snow. 2015, 55 (4): 35–49 [In Russian].

3. Mikhalenko V.N., Kutuzov S.S., Lavrentiev I.I., Kunakhovich M.G., Thompson L.G. Studies of the western glacial plateau of Elbrus: results and prospects. Materialy glyatsiologicheskikh issledovaniy. Data of Glaciological Studies. 2005, 99: 185–190 [In Russian].

4. Toropov P.A., Mikhalenko V.N., Kutuzov S.S., Morozova P.A., Shestakova A.A. Temperature and radiation regime of glaciers on the slopes of Elbrus during the ablation period over the past 65 years. Led i Sneg. Ice and Snow. 2016, 56 (1): 5–19 [In Russian].

5. Chizhova Yu.N., Mikhalenko V.N., Vasil’chuk Yu.K., Budantseva N.A., Kozachek A.V., Kutuzov S.S., Lavrentiev I.I. Isotopic composition of oxygen in snow-and-firn thickness on the Eastern peak of Elbrus, the Caucasus. Led i Sneg. Ice and Snow. 2019, 59 (3): 293–305 [In Russian]. https://doi.org/10.15356/2076-6734-2019-3-426