Ice and SnowIce and SnowЛед и снег2076-67342412-3765The Russian Academy of Sciences65940310.31857/S2076673423010052GITPOPGlaciers and ice sheetsЛедники и ледниковые покровыIsotopic Signature of Precipitation in the Elbrus RegionИзотопные характеристики атмосферных осадков в ПриэльбрусьеChizhovaJu. N.ЧижоваЮ. Н.eacentr@yandex.ruMikhalenkoV. N.МихаленкоВ. Н.eacentr@yandex.ruKutuzovS. S.КутузовС. С.eacentr@yandex.ruShukurovK. A.ШукуровК. А.eacentr@yandex.ruKozachekA. V.КозачекА. В.eacentr@yandex.ruInstitute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of ScienceИнститут геологии рудных месторождений, петрологии, минералогии и геохимии РАНInstitute of Geography, Russian Academy of ScienceИнститут географии РАНA.M. Obukhov Institute of Atmospheric Physics, Russian Academy of SciencesИнститут физики атмосферы им. А.М. Обухова РАНArctic and Antarctic Research InstituteАрктический и Антарктический научно-исследовательский институт01012023631334720022025Copyright ©; 2023, Ю.Н. Чижова, В.Н. Михаленко, С.С. Кутузов, К.А. Шукуров, А.В. КозачекCopyright ©; 2023, Ю.Н. Чижова, В.Н. Михаленко, С.С. Кутузов, К.А. Шукуров, А.В. Козачек2023Ю.Н. Чижова, В.Н. Михаленко, С.С. Кутузов, К.А. Шукуров, А.В. КозачекЮ.Н. Чижова, В.Н. Михаленко, С.С. Кутузов, К.А. Шукуров, А.В. Козачекhttp://creativecommons.org/licenses/by/4.0https://journals.eco-vector.com/2076-6734/article/view/659403

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.

Приведены результаты изучения изотопных характеристик осадков, выпадающих у подножия южного склона Эльбруса, Кавказ. Отбор осадков организован на станции Азау (абс. высота 2300 м) на ежедневной основе. Установлены основные источники осадков для Приэльбрусья с применением метода обратных траекторий движения воздушных масс. Значения δ18О осадков содержат выраженную связь с температурой приземного слоя воздуха: Δδ18О/ΔT = 0.85‰/°С.

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