Distribution of Optical and Hydrological Characteristics in the Antarctic Sound Based on the Measurements in January, 2022 in the 87th cruise of the R/V “Akademik Mstislav Keldysh”

A. A. Latushkin1, ✉, V. I. Ponomarev2, P. A. Salyuk2, D. I. Frey1, 3, N. A. Lipinskaya1, S. P. Shkorba2

1 Marine Hydrophysical Institute of RAS, Sevastopol, Russian Federation

2 V. I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russian Federation

3 Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russian Federation

✉ e-mail: sevsalat@gmail.com

Abstract

Purpose. The purpose of the work is to study the different-scale features of distribution of the hydrooptical and hydrological characteristics in the Antarctic Sound based on the contact and satellite measurements carried out in January, 2022 in the 87th cruise of the R/V “Akademik Mstislav Keldysh”.

Methods and Results. The data of complex natural measurements performed at the oceanographic stations in the Antarctic Sound on January 27–28, 2022 in the 87th cruise of the R/V “Akademik Mstislav Keldysh” were used. Additionally, the satellite data were analyzed. Complex hydrophysical equipment permitted to obtain the vertical profiles of temperature, salinity, dissolved oxygen, chlorophyll a concentration, fluorescence intensity of colored dissolved organic matter, intensity of the beam attenuation coefficient at 660 nm and photosynthetically active radiation. Based on these data, the main features of mesoscale circulation within the cyclonic gyre over the deep-sea part in the southern Antarctic Sound were determined. The joint analysis of hydrooptical and hydrological characteristics, and satellite measurements in the Antarctic Sound obtained in course of the Antarctic expedition showed presence of a system of the alternating anticyclonic and cyclonic eddies in the area under study. It is also shown that in the ice drift area polluted by land soils or shelf bottom sediments, a zone of the increased turbidity arises that is related to the terrigenous suspension entering into the water during ice melting.

Conclusions. The system of the different-scales eddies and currents in the Antarctic Sound contributes to the water exchange between the upper and deep layers of the strait, as well as between the Weddell Sea water spreading to the north-northwest along the slope of the strait basin adjacent to the shelf edge of the Antarctic Peninsula and the Bransfield Straight waters spreading along the slope of the islands’ shelf which is the northeastern boundary of the strait.

Keywords

Antarctic Sound, mesoscale eddies, hydrooptics, hydrology, beam attenuation coefficient, chlorophyll a concentration, fluorescence, dissolved organic matter, remote sensing

Acknowledgements

Study of mesoscale eddies based on natural and remote measurements was supported within the framework of state assignments MHI FNNN-2022-0001, FNNN-2021-0003, and POI No. 122110700009-1, No. 121021500054-3. Processing and analysis of hydrophysical data were supported by the RSF grant 22-77-10004.

Original russian text

Original Russian Text © The Authors, 2023, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 39, Iss. 1, pp. 52-66 (2023)

For citation

Latushkin, A.A., Ponomarev, V.I., Salyuk, P.A., Frey, D.I., Lipinskaya, N.A. and Shkorba, S.P., 2023. Distribution of Optical and Hydrological Characteristics in the Antarctic Sound Based on the Measurements in January, 2022 in the 87th cruise of the R/V “Akademik Mstislav Keldysh”. Physical Oceanography, 30(1), pp. 47-61. doi:10.22449/1573-160X-2023-1-47-61

DOI

10.22449/1573-160X-2023-1-47-61

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