Physical Oceanography Physical Oceanography 1573-160X 20230104 Experimental and field research Research Article 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" https://orcid.org/0000-0002-3412-7339 U-8871-2019 1239-2858 Latushkin A. A.
Russian Federation
sevsalat@gmail.com https://orcid.org/0000-0002-0501-460X B-8444-2014 5421-9651 Ponomarev V. I.
Russian Federation
https://orcid.org/0000-0002-3224-710X E-8592-2014 1454-3891 Salyuk P. A.
Russian Federation
pavel.salyuk@gmail.com https://orcid.org/0000-0001-8141-9513 X-9812-2018 9228-1374 Frey D. I.
Russian Federation
dima.frey@gmail.com https://orcid.org/0000-0002-3177-4426 AGE-0831-2022 2826-5686 Lipinskaya N. A.
Russian Federation
ef.na.hc@gmail.com https://orcid.org/0000-0002-2385-7686 B-7713-2014 8197-6065 Shkorba S. P.
Russian Federation
podtel@poi.dvo.ru Marine Hydrophysical Institute of RAS 2 Kapitanskaya Str. Sevastopol 299011 Russian Federation V. I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch of Russian Academy of Sciences 43 Baltiyskaya Str. Vladivostok 690041 Russian Federation Shirshov Institute of Oceanology, Russian Academy of Sciences 36 Nakhimovskiy Prospect Moscow 117997 Russian Federation 28 02 2023 30 1 47 61 30 06 2022 25 10 2022 08 11 2022 Copyright ©; 2023, A. A. Latushkin, V. I. Ponomarev, P. A. Salyuk, D. I. Frey, N. A. Lipinskaya, S. P. Shkorba 2023 A. A. Latushkin, V. I. Ponomarev, P. A. Salyuk, D. I. Frey, N. A. Lipinskaya, S. P. Shkorba https://creativecommons.org/licenses/by-nc/4.0/ https://physical-oceanography.ru/repository/issues/2023/01/04/

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.

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

Article text not included.

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