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Abstract <p>The paper presents the annual variability of <sup>226</sup>Ra and <sup>228</sup>Ra isotope concentrations, nutrients content, and hydrological parameters in coastal waters of the karsted area near Cape Aya in the period from 2019 to 2025. The minimum radionuclide concentrations correspond to dry periods (2021, 2023–2025). The <sup>228</sup>Ra/<sup>226</sup>Ra isotope activity ratio was shown to be an indicator of freshwater influence even without significant salinity decline. The extent of the freshwater plume originating from the karst cavity was determined. Seasonal fluctuations in temperature, salinity, and biogenic elements were governed by meteorological conditions and the intensity of biogeochemical processes. The estimated submarine groundwater discharge (SGD) rate during the period from 2019 to 2025 ranged from 5.47 to 13.5 thousand m<sup>3</sup>/day, correlating with precipitation inputs and the duration of dry periods preceding sampling.</p>

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Annual Variability of Hydrochemical and Hydrological Characteristics in Submarine Groundwater Discharge at Cape Aya (Crimean Peninsula) in the Period from 2019 to 2025

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • O. N. Kozlovskaya,
  • N. A. Bezhin,
  • V. A. Razina,
  • I. G. Shibetskaya,
  • V. A. Turyanskii,
  • R. O. Ustinov,
  • I. G. Tananaev

摘要

Abstract

The paper presents the annual variability of 226Ra and 228Ra isotope concentrations, nutrients content, and hydrological parameters in coastal waters of the karsted area near Cape Aya in the period from 2019 to 2025. The minimum radionuclide concentrations correspond to dry periods (2021, 2023–2025). The 228Ra/226Ra isotope activity ratio was shown to be an indicator of freshwater influence even without significant salinity decline. The extent of the freshwater plume originating from the karst cavity was determined. Seasonal fluctuations in temperature, salinity, and biogenic elements were governed by meteorological conditions and the intensity of biogeochemical processes. The estimated submarine groundwater discharge (SGD) rate during the period from 2019 to 2025 ranged from 5.47 to 13.5 thousand m3/day, correlating with precipitation inputs and the duration of dry periods preceding sampling.