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Selection of potential polygons for absolute calibration of the Russian scanner/sounder MTVZA-GYa

I.N. Sadovsky¹ , D.S. Sazonov¹

¹ Space Research Institute RAS, Moscow, Russia

Accepted: 28.12.2024
DOI: 10.21046/2070-7401-2025-22-1-26-39

This paper presents a description of an approach to allocation of land surface zones suitable for performing absolute calibration of frequency channels of the Russian scanner/sounder named MTVZA GYa (Microwave Atmospheric Temperature and Humidity Sounding Module, GYa — in memory of G. Ya. Gus’kov (1918–2002)). The method is based on the assessment of statistical characteristics of effective emissivity of the underlying surface – atmosphere system. To calculate instantaneous values of this parameter, the results of MTVZA-GYa measurements for 2020 were used, as well as surface temperature data taken from the MERRA-2 (Modern-Era Retrospective analysis for Research and Applications version 2) reanalysis database. Further evaluation of the standard deviation of effective emissivity for each element of a regular grid with a step of 0.25 allows assessing the variability of parameters of land and surface layer of the atmosphere within its limits. Identification of areas with the lowest values of the estimated parameter allows selecting areas that are most preferable for absolute calibration of individual frequency channels of MTVZA-GYa. The unification of these zones, individual for each frequency and designed as masks, is performed on the basis of constructing the corresponding generalized global fields, clearly displaying the location of the optimal polygons for calibration. The paper presents a description of the main stages of the proposed approach, examines problems that arise during their implementation, and outlines the main ways of further improvement. The first results of the search for relevant calibration areas on the territory of the Russian Federation are also presented.

Keywords: remote sensing, microwave radiometry, microwave scanner/sounder MTVZA-GYa, satellite, reanalysis data, absolute calibration

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References:

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