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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2023, Vol. 20, No. 4, pp. 239-249

Small eddy structures of the Bering Sea and the shelf of the Kuril-Kamchatka region based on satellite radar data in the warm period 2020–2021

A.V. Zimin 1, 2 , O.A. Atadzhanova 1, 3 , A.A. Konik 1 , K.A. Kruglova 1 
1 Shirshov Institute of Oceanology RAS, Moscow, Russia
2 Saint Petersburg State University, Saint Petersburg, Russia
3 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 11.08.2023
DOI: 10.21046/2070-7401-2023-20-4-239-249
The paper presents the results of analysis of observations of the spatial and temporal variability of manifestations of small eddy structures from June to September 2020–2021 in the shelf areas of the Bering Sea and the Kurilo-Kamchatka region based on radar images. 3300 high-resolution Sentinel-1A/B images were used as input data. 1704 surface manifestations of eddy structures were registered, of which 1449 were cyclonic and 255 anticyclonic. Most of the manifestations of eddies were recorded in the northern shallow water part of the Bering Sea, in the Olutorsky and Karaginsky bays and in the Bussol and Fourth Kuril straits. The average diameter of eddies structures in the Bering Sea was 2.9 km, in the Kuril-Kamchatka region 4.3 km, which corresponds to the average summer season estimates of the baroclinic Rossby radius for the shallow water areas under consideration. It was established that in the Bering Sea the mean diameters of submesoscale cyclonic and anticyclonic eddies coincided, and in the Kurilo-Kamchatka region the diameters of cyclonic eddies exceeded the anticyclonic ones almost twofold. Significant interannual variability in the quantity and characteristics of detected eddies has been identified. An example is given of a group of cyclonic sub-mesoscale eddies structures that occurred on the periphery of a larger anticyclonic formation.
Keywords: satellite radar images, Sentinel-1, statistical characteristics of eddies, submesoscale, shelf of the Kuril-Kamchatka region, Bering Sea
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