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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, 2022, Vol. 19, No. 6, pp. 175-185

On the retrieval of wind speed and friction wind speed based on Sentinel-1 and SFMR data under tropical cyclone conditions

O.S. Ermakova 1 , N.S. Rusakov 1 , E.I. Poplavsky 1 , D.A. Sergeev 1 , Yu.I. Troitskaya 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
Accepted: 18.11.2022
DOI: 10.21046/2070-7401-2022-19-6-175-185
The work is devoted to the development of an algorithm for wind speed at a height of 10 m and friction speed retrieval in hurricane conditions based on a new geophysical model function (GMF) using image data obtained for cross-polarization from the Sentinel-1 satellite in IW (Interferometric Wide swath) mode. The images were collocated with measurements from the SFMR microwave radiometer. The analysis was performed for satellite images of six hurricanes (categories on the Saffir-Simpson Hurricane Wind Scale — SSHS): Irma (Category 5), Maria (Category 5), Hermine (Category 1), Larry (Category 3), Dorian (Category 5), Delta (Category 4). The creation of the GMF is based on the approach proposed by the authors earlier, based on the calibration of the ocean surface emissivity, obtained from SFMR measurements, to the data on the parameters of the atmospheric boundary layer, obtained from the data of GPS-dropsondes. The proposed GMF is suitable for wind speed retrieval for moderate winds with speeds from 15 m/s up to extreme values of about 69 m/s for the first two image sub swaths and up to 40 m/s for the third image sub swath, friction velocities can be retrieved in the range from 0.8 to 1.7 m/s for all sub swaths. It is shown that the results of calculations within the proposed geophysical model function are in good agreement with the existing MS1A GMF, in this case, the limiting values of the retrieved wind speeds obtained with our GMF turn out to be higher for the first two sub swaths.
Keywords: wind speed, tropical cyclone, cross polarization, radiometer, SAR image, friction velocity
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