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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, 2024, Vol. 21, No. 2, pp. 251-260

Short-period internal waves in the Pacific area of the Kamchatka Peninsula and the Northern Kuril Islands according to 2017–2021 satellite radar observations

E.I. Svergun 1 , A.V. Zimin 1, 2 , A.A. Konik 1 
1 P.P. Shirshov Institute of Oceanology RAS, Moscow, Russia
2 Saint Petersburg State University, Saint Petersburg, Russia
Accepted: 21.02.2024
DOI: 10.21046/2070-7401-2024-21-2-251-260
The paper considers the variability of short-period internal waves in Pacific waters near the Kamchatka Peninsula and the northern Kuril Islands in August 2017 to 2021 based on processing of Sentinel-1 radar images. By analyzing the frequency of occurrence over five years, “hot spots” (areas of frequent occurrence) of internal waves were identified east of the Fourth Kuril Strait, near cape Lopatka and the Shipunsky Peninsula, on the southeastern shelf of the Kamchatka Peninsula, as well as in the southern part of the Kronotsky Bay. Geometric characteristics of internal wave manifestations and their frequent occurrence areas have been found to maintain stable from year to year. The study compared the results of radar image processing with data from the ERA 5 atmospheric reanalysis and the GLORYS12V1 product of the Copernicus ocean reanalysis, as well as the global tidal model TPXO9. It was found that the factors determining the number of recorded manifestations of internal waves in the study area are, at the interannual interval, the features of vertical water stratification and, at the intramonthly interval, the features of syzygy-quadrature tidal cycle. Wind is a factor that affects reliable detection of manifestations in both cases. Therefore, objective estimates of the position of ‘hot spots’ in the field of internal waves can only be obtained by analyzing long-term archives of satellite radar images. It should be noted that the areas where internal waves frequently occur near the eastern shelf of Kamchatka and in the Kronotsky Bay coincide with the areas where pollock spawn and grow during their early stages.
Keywords: radar images, short-period internal waves, occurrence frequency of wind, density gradient, tidal current, Pacific Ocean, Kamchatka Peninsula shelf
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