New data of deuterium excess values of glacial ice of Kamchatka

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Abstract

The isotopic signature (δ18О, δ2Н, d-excess) of the ice of the Ushkovsky volcano in Kamchatka were studied. A new shallow ice core was obtained in 2022 in the Gorshkov crater. The 14 m long ice core was dated by counting annual layers, which were also compared with known eruptions in recent years. The upper 14 m of the glacier were formed over the last 16 years (from 2006 to 2022). The values of δ18О very from −16 to −24‰, δ2Н from −110,5 to −177,7‰, the averaged values are −20,5 and −150,2‰, respectively. The d-excess value varies with depth from 8,7 to 21,3‰, the average value is 13,7‰. For winter horizons at low values of δ18О and δ2Н, an increase in d-excess is noted. Such features are associated with the origin of moisture brought to Kamchatka. The source of moisture is the Pacific Ocean, the Sea of Okhotsk and the Sea of Japan, for which there are pronounced differences in the conditions of moisture evaporation between summer and winter. The increasing trends in δ18О and δ2Н values from 2006 to 2022 are accompanied by a decrease in deuterium excess, indicating an increase of summer precipitation. However, in addition to changes in seasonal proportions of precipitation, ice d-excess values may reflect climatic changes in the source of moisture.

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About the authors

Yu. N. Chizhova

Institute of Geology of Ore Deposits, Petrology, Mineralogy and Geochemistry, Russian Academy of Sciences; Institute of Geography, Russian Academy of Sciences

Author for correspondence.
Email: eacentr@yandex.ru
Russian Federation, Moscow; Moscow

V. N. Mikhalenko

Institute of Geography, Russian Academy of Sciences

Email: eacentr@yandex.ru
Russian Federation, Moscow

I. A. Korneva

Institute of Geography, Russian Academy of Sciences

Email: eacentr@yandex.ru
Russian Federation, Moscow

Ya. D. Muravyov

Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences

Email: eacentr@yandex.ru
Russian Federation, Petropavlovsk-Kamchatsky

A. G. Hayredinova

Institute of Geography, Russian Academy of Sciences

Email: eacentr@yandex.ru
Russian Federation, Moscow

M. A. Vorobiev

Institute of Geography, Russian Academy of Sciences

Email: eacentr@yandex.ru
Russian Federation, Moscow

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2. Fig. 1. Research area.

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3. Fig. 2. Distribution of density, δ18O, δ2H and d-excess values of ice by depth in the Ushkovsky core. The thick black line shows the averaged annual values, the boundaries of the annual layers are shown by the dotted line.

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4. Fig. 3. The δ18O-δ2H ratio for all ice samples (a) and the deviation of the average values of each annual layer from the average long-term value for the core (b): 1 – δ18O and δ2H values of ice samples taken with a step of 5 cm, 2 – average annual values of δ18O and δ2H, 3 – average value for core K-2 according to [3, 4].

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5. Fig. 4. Trends in the change of average annual values of δ18O (1) and air temperature (2), calculated based on observations at the Klyuchi meteorological station, taking into account the altitudinal gradient of −6°C/km. Meteorological information for the Klyuchi station (No. 32389) was obtained from the database of the Federal State Budgetary Institution VNIIGMI-MCD [16].

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