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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, 2025, V. 22, No. 6, pp. 260-273

Analysis of a mesoscale eddy structure based on multispectral satellite and hydrological measurements in Avacha Bay in the summer of 2024

M.V. Vrublevsky 1 , A.A. Konik 2 , O.A. Atadzhanova 2 
1 Space Research Institute RAS, Moscow, Russia
2 Shirshov Institute of Oceanology RAS, Moscow, Russia
Accepted: 29.09.2025
DOI: 10.21046/2070-7401-2025-22-6-260-273
During the study, spatial and temporal characteristics of an anticyclonic mesoscale eddy in Avacha Bay were obtained using a wide range of satellite sensors and concurrent hydrological measurements in situ. Using data from space-based sensors, the development of eddy characteristics (spatial dimensions and position, influence on the field of sea surface temperature and concentration of suspended matter and chlorophyll) was analyzed from the moment of its appearance in Avacha Bay (05.07.2024) until the end of the time period (13.08.2024), which can be considered quasi-simultaneous to the in situ measurements. At the time of measurements, the effective radius of the eddy reached 78 km, the area was 9600 km2, and the sea surface temperature in the eddy differed from the external waters by 1–2°C. From analysis of the hydrological survey data, an assessment was made of the influence of the studied eddy on the hydrological structure of Avacha Bay waters. The eddy deepens by 142 m the cold intermediate layer, the temperature of which at upper and lower boundaries was 3.4°C. A comprehensive analysis of remote sensing and in situ data made it possible to estimate the eddy depth (495 m) and volume (2263 km3), and the reconstruction of salinity and temperature fields made it possible to assess the change in the structure of Avacha Bay waters under the influence of the eddy: the obtained isotherms and isohalines have a characteristic parabolic shape. The studied anticyclonic eddy has a cold core in the sea surface temperature field, which is a relatively rare phenomenon in the World Ocean, and that is why its comprehensive analysis makes a significant contribution to the study of similar phenomena.
Keywords: mesoscale eddy, satellite altimetry, SWOT, Sentinel-3, OLCI, MODIS, in situ, hydrological measurements, Avacha Bay, Pacific Ocean
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