статья в журнале

En

Physical Oceanography

ISSN:1573-160

2025

Purpose. The purpose of the study is to assess changes in the thermohaline structure and oxygen content in the cold intermediate layer (CIL) of the coastal shelf waters along the Southern Coast of Crimea in 1986–2000 and 2007–2023. Methods and Results. A dataset comprising 13,286 measurements of temperature, electrical conductivity and hydrostatic pressure was analyzed. The measurements were conducted at two polygons (Goluboy Bay, including the Katsiveli oceanographic platform, and Yalta Bay) using the Sea-Bird 911plus CTD probe (Sea Bird Electronics, USA) in 1986–2000 and 2007–2023, and the IDRONAUT OCEAN SEVEN 320Plus M hydro-chemical sounding CTD complex in 2022–2023. For the first time in the Crimean shelf waters, an increase in dissolved oxygen content within the CIL has been identified, despite rising water temperature and density over the past 15 years, based on the data averaged across two periods (spanning ~ 40 years). In 1986–2000, the average temperature in the CIL core did not exceed 8 °C, whereas in 2022–2023, values ranged from 8.1 to 8.9 °C. The average density at 100 m depth increased from 14.57 to 15.25 kg/m3. Conclusions. For the first time, the long-term dynamics of dissolved oxygen content in the CIL have been characterized for the Crimea shelf water areas. The results indicate that the response of the shelf ecosystem of the Southern Coast of Crimea to external impacts (climatic changes) is more pronounced than in the deep sea. Even a minor absolute increase in water temperature and density has been accompanied by substantial restructuring of the hydrological structure and anomalies in CIL formation. The reasons for the anomalies in the Southern Coast of Crimea require further study.

cold intermediate layer, long-term dynamics, thermohaline structure, conditional density, dissolved oxygen, shelf area of the Southern Coast of Crimea

2-s2.0-105027761429

Sovga, E.E., Khmara, T.V. and Konovalov, S.K., 2025. Thermohaline Structure of Waters and Oxygen Content in the Cold Intermediate Layer in the Coastal Water Areas of Crimea (Black Sea). Physical Oceanography, 32(6), pp. 743-754.