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


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 2, pp. 205-215

On retrieval of the atmospheric boundary layer dynamic parameters based on collocated measurements of the SFMR and NOAA GPS dropsondes in hurricane

E.I. Poplavsky 1 , N.S. Rusakov 1 , O.S. Ermakova 1 , G.N. Balandina 1 , D.A. Sergeev 1 , Yu.I. Troitskaya 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
Accepted: 27.11.2020
DOI: 10.21046/2070-7401-2021-18-2-205-215
The work is devoted to the development of a method for the tropical cyclones boundary atmospheric layer parameters retrieval, namely the dynamic speed and wind speed at meteorological height. For the analysis, we used the results of field measurements of wind speed profiles from GPS-dropsondes launched from National Oceanic and Atmospheric Administration (NOAA) aircraft and collocated data from the Stepped-Frequency Microwave Radiometer (SFMR) located on the aircraft from which the GPS-dropsondes were launched. The emissivity was calibrated, which was determined from the data of radiometric measurements to field data obtained from the falling GPS-dropsondes. To determine the parameters of the atmospheric boundary layer from the data of GPS-dropsondes, an algorithm was used based on taking into account the self-similarity of the velocity defect profile. This algorithm makes it possible to retrieve the value of the wind speed at meteorological height from the averaged data in the wake part of the profiles of the atmospheric boundary layer. A comparison of the dependences of the wind speed at meteorological height reconstructed from the SFMR data and measurements from GPS-dropsondes obtained in the current work with similar dependences was carried out and their satisfactory agreement was demonstrated.
Keywords: hurricane, microwave remote sensing, boundary layers of the atmosphere and ocean, dynamic wind speed, tangential turbulent wind stress, radiometer, emissivity
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