ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2019, Vol. 16, No. 6, pp. 51-59

Retrieval of the atmospheric boundary layer parameters in a tropical cyclone based on the collocated data from GPS-sondes and satellite radar images

O.S. Ermakova 1 , D.A. Sergeev 1 , G.N. Balandina 1 , N.S. Rusakov 1 , E.I. Poplavsky 1 , Yu.I. Troitskaya 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
Accepted: 06.09.2019
DOI: 10.21046/2070-7401-2019-16-6-51-59
The paper is devoted to the study of the dependence of scattered microwave cross-polarized signal characteristics from Sentinel-1 satellite on the parameters of the atmospheric boundary layer based on data obtained from falling NOAA GPS sondes under adverse weather conditions in order to develop a geophysical model function (GMF). Field measurements and remote sensing data for hurricanes in the Atlantic basin were analyzed. For the data measured by GPS-sondes, average wind speed profiles were obtained, while the parameters of the wind boundary layer (roughness parameter and friction velocity) were restored using the self-similarity property from measurements in the “wake” part of the velocity profiles. Wind speed profiles for hurricanes Irma 07.09.2017, Maria 21.09.2017 and 23.09.2017, measured at a time close to the time of receiving satellite SAR images were used to calibrate both the wind speed and dynamic speed. This made it possible to obtain the dependence of the normalized radar cross-section (NRCS) of the cross-polarized signal scattered from the sea surface on the dynamic velocity of the wind flow.
Keywords: microwave scattering at the sea surface, cross-polarization, storm, hurricane, microwave remote sensing, polarization, boundary layers of the atmosphere and ocean, wind speed, turbulent wind stress
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