Spatial Characteristics of the Black Sea Cold Intermediate Layer in Summer, 2017

A. N. Morozov✉, E. V. Mankovskaya

Marine Hydrophysical Institute, Russian Academy of Sciences, Sevastopol, Russian Federation

✉ e-mail: anmorozov@mhi-ras.ru

Abstract

Purpose. The aim of the paper is to study spatial characteristics of the cold intermediate layer (CIL) after its waters were renewed due to the cold winter, using analysis of the data obtained during the Black Sea expedition in June 14 – July 3, 2017 (the 95th cruise of R/V “Professor Vodyanitsky”).

Methods and Results. The data both from the CTD-measurements by the _SBE_911+ probe and the current velocity profile measurements by the Lowered Acoustic Doppler Current Profiler (LADCP) were used. Isopycnic averaging of the profile ensembles was applied to obtain the averaged characteristics of the water vertical thermohaline structure. During the measurement period, the minimum average temperature of the CIL core was 7.2°C at the density value 14.5 kg/m3. The layer upper boundary (according to the 8°C criterion) corresponded to the density value ~14.3 kg/m3, its lower one – to ~15.0 kg/m3. CIL water formation was most pronounced in the vicinity of the Rim Current, which was clearly seen on the isopycnic surfaces 14.6, and 15.0 kg/m3. According to the measurements, the main mass of CIL waters was identified in the Rim Current and in its right part (on the coast side). The CIL maximum thickness was ~60 m and the vertical position of its core corresponded to the 40–100 m depth.

Conclusions. The synchronous profiles of current velocity, temperature, salinity, and density obtained in the Black Sea expedition in summer, 2017 made it possible to analyze the waters thermohaline structure with the regard for real dynamic situation. As a result, the CIL parameters, its spatial scales and position relative to the Rim Current were determined with due regard for the features of the density field structure in summer, 2017. This information can be useful for model verification and numerical experiments aimed at studying the mechanisms and the areas of CIL formation in the Black Sea.

Keywords

cold intermediate layer, Black Sea, temperature, cold intermediate layer boundary, Rim Current

Acknowledgements

The work was carried out within the framework of the state task on themes No. 0555-2021-0003 “Operational Oceanology” and No. 0555-2021-0005 “Coastal Research”. We are very grateful to the crew of R/V “Professor Vodyanitsky” and to the staff of the Expeditionary Research department of Marine Hydrophysical Institute, Russian Academy of Sciences, who were highly professional in performing the measurements.

Original russian text

Original Russian Text © A. N. Morozov, E. V. Mankovskaya, 2021, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 37, Iss. 4, pp. 436-446 (2021)

For citation

Morozov, A.N. and Mankovskaya, E.V., 2021. Spatial Characteristics of the Black Sea Cold Intermediate Layer in Summer, 2017. Physical Oceanography, 28(4), pp. 404-413. doi:10.22449/1573-160X-2021-4-404-413

DOI

10.22449/1573-160X-2021-4-404-413

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