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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, 2026. Т. 23. № 3. С. 59-73

Improvement of daily averaged fields of satellite microwave radiometer measurements

E.V. Zabolotskikh 1 , D.E. Yakovlev 1 , E.V. Lvova 1 , M.D. Kudel 1 , K.I. Yarusov 1 
1 Russian State Hydrometeorological University, Saint Petersburg, Russia
Accepted: 05.03.2026
DOI: 10.21046/2070-7401-2026-23-3-59-73
Data of satellite microwave radiometers ensure global monitoring of atmospheric and surface parameters independently of cloud cover and sunlight. Still, low spatial resolution of brightness temperature TB measurements at low-frequency channels hampers their application. A brief overview of existing methods for increasing the spatial resolution of microwave measurements is given. We also present a method for improving the quality and informational content of daily averaged measurements of the Advanced Microwave Scanning Radiometer 2 (AMSR2) at C-band channels for the Arctic region. The method requires usage of a regular coordinate grid with a resolution of 1×1 km before averaging the data and recalculating the initial Level 1R TB data onto the new grid with bilinear interpolation. This method preserves the maximum amount of information from all measurements of the day in the daily averaged data and avoids excessive data smoothing, which is inevitable with traditional approaches. As a result, the informational content of the data and the sharpness of TB fields is increased due to high temporal resolution of radiometric measurements at high latitudes. Examples of improved TB fields at 6.9 GHz compared to the standard product of the Japan Aerospace Exploration Agency are presented. This approach can be used to study the underlying surface based on the analysis of AMSR2 measurements at 6.9 GHz. The approach has also great potential for sea ice concentration retrieval from measurements at 6.9 GHz as both atmospheric influence and variability of sea ice and sea water microwave emission are minimal for this channel.
Keywords: Arctic, AMSR2, brightness temperature fields, spatial resolution, daily averaged data
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