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Reasons for the Long-Term Variability of the Dissolved Oxygen Concentration in the Upper Layer of the Black Sea

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Abstract

According to archival data for the period from 1923 to 2022, the long-term (interdecadal and interannual) variability of the dissolved oxygen concentration and temperature in the surface layer of the Black Sea in the spring hydrological season (from May to June) is analyzed. The lowest oxygen concentrations over the entire period of instrumental observations (approximately 100 years) were observed on the northwestern shelf and in the open part of the Black Sea for the period from 1923 to 1932. The negative anomalies of dissolved oxygen exceeded (in absolute value) the corresponding anomalies noted during the period of eutrophication of the Black Sea waters in the last decades of the 20th century. The main reason for the extreme anomalies discovered in the 1920s is the increase in the temperature of the surface layer of the Black Sea waters during this period.

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ACKNOWLEDGMENTS

We are grateful to the reviewer for helpful comments that improved the quality of the manuscript.

Funding

This work was carried out within the framework of a State Assignment of the Institute of Natural and Technical Systems on the theme “Fundamental Studies of Processes in the Climate System That Determine the Spatial and Temporal Variability of the Natural Environment on the Global and Regional Scales” (state registration no. 121122300074-7).

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Authors and Affiliations

  1. Institute of Natural and Technical Systems, 299011, Sevastopol, Russia

    A. B. Polonsky & A. A. Valle

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  1. A. B. Polonsky
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  2. A. A. Valle
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Correspondence to A. B. Polonsky.

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Translated by V. Krutikova

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Polonsky, A.B., Valle, A.A. Reasons for the Long-Term Variability of the Dissolved Oxygen Concentration in the Upper Layer of the Black Sea. Dokl. Earth Sc. (2024). https://doi.org/10.1134/S1028334X24600853

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  • DOI: https://doi.org/10.1134/S1028334X24600853

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