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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. 6, pp. 331-343

Estimation of large wave asymmetry influence on sea surface self-radiation

I.N. Sadovsky 1, 2 , D.S. Sazonov 1 
1 Space Research Institute RAS, Moscow, Russia
2 MIREA — Russian Technological University, Moscow, Russia
Accepted: 28.11.2024
DOI: 10.21046/2070-7401-2024-21-6-331-343
The main objective of the work is to assess the influence of the asymmetry of the wind wave slope distribution on the results of calculations of the emissivity of the sea surface within the framework of a two-scale model of radiation formation. Since the existing models of wind wave spectrum do not contain this information (on the asymmetry of slope distribution), the authors use the results of in situ measurements obtained with a string wave recorder. Experimental measurements of wave characteristics correspond to a wind speed of 11 m/s and apply to wave components longer than 0.45–0.63 rad/cm. Based on these measurements, it is shown that the slope distribution function along the direction of wave propagation is best described by the gamma function. These data were integrated into the technology of calculating the brightness contrast of the sea surface in accordance with the two-scale model of radiation formation. It was shown that taking into account the asymmetry of large waves indeed has a significant effect on the change in the emissivity of the sea surface. The absolute values of the deviations are a function of the spatial orientation of the observation vector. It should be noted that the two-scale model used cannot correctly describe the effect of azimuthal anisotropy of radiothermal radiation, even taking into account the asymmetry of the waves. However, the angular dependences of the long-wave contribution to the radiation, calculated in accordance with this model using the Gamma function of the slope distribution, coincide in shape with the data of natural observations.
Keywords: two-scale model, self-radiation, radio-brightness contrast, wind waves, slope asymmetry, sea surface, azimuthal anisotropy, gamma function
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