Study the Possibility of Precipitation Intensity Recovery from MTVZA-GYa Measurements

In this paper, we present an algorithm for restoring rain rate over the ocean according to the data of the microwave sounder MTVZA-GYa. The basis of the developed algorithm is the ALG'85 regression model, in which the scattering index on the high-frequency radiometric channel (~90 GHz) is used to estimate the intensity of precipitation. In this work, the scattering index was simulated based on the MTVZA-GYa data and compared with the GPM IMERG reanalysis data. To restore the rain rate, it is proposed to use a polynomial of the fourth degree. The obtained quantitative estimates show that the spread of RMS reaches 50%, and the correlation coefficient does not exceed 0.75. The qualitative comparison indicates a significant difference between the restored rain rate and the GPM IMERG data and the presence of a shift in the precipitation area. As a result of the analysis, it was concluded that one of the reasons may be the incorrect convergence of the beams of the radiation patterns for various frequency channels of the MTVZA-GYa device.