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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. 1, pp. 348-354

On the use of SAR images to estimate long-wave attenuation at the ocean surface in the presence of fragmented ice

O.A. Danilicheva 1, 2 , S.A. Ermakov 1, 2, 3 , G.E. Khazanov 1, 2 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
2 Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
3 Volga State University of Water Transport, Nizhny Novgorod, Russia
Accepted: 12.01.2024
DOI: 10.21046/2070-7401-2024-21-1-348-354
A methodology for using Sentinel-1 satellite radar images to estimate the attenuation of long gravity waves in the presence of fragmented ice cover is proposed. The technique is based on the estimation of NRCS (normalized radar cross section) fluctuations associated with the modulation of the radar signal power by long ocean waves. Based on the modulation-transfer function concept, it is assumed that small variations of the NRCS on long-wave scales are proportional to the amplitude of the latter. The attenuation of waves of a certain length propagating in a given direction is estimated by the change of their amplitude in different parts of the radar image, the direction of wave propagation is determined from the analysis of the two-dimensional spectrum of the radar image. Using this technique, we obtained an estimate of the attenuation coefficient of long gravity waves on fragmented ice from the radar image of the Atlantic Ocean region near the southeastern part of Greenland. It is shown that the obtained estimate agrees well with the contact measurement data presented in the literature.
Keywords: SAR, radar images, wave attenuation, ice
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