Russian Federation
Russian Federation
Purpose. The purpose of the work is to study the possibility of improving spatial resolution of the Ad-vanced Microwave Scanning Radiometer 2 (AMSR2) on the C-band channels using the measurements at the 36.5 GHz frequency for investigating the underlying surface parameters of the Arctic seas. Methods and Results. The results of numerical modeling of the brightness temperature (T) of the sea ice-ocean-atmosphere system microwave radiation under conditions of the non-scattering Arctic atmos-phere, as well as the calculations of T for the atmospheric and oceanic parameters based on the ERA5 reanalysis data were used. The values of sea ice effective emission coefficients previously calculated for the entire Arctic region were applied in calculations. The T sensitivity to atmospheric radiation, surface temperature and underlying surface emission coefficients at the 6.9 and 36.5 GHz measurement chan-nels at the horizontal and vertical polarizations, and also variability of the above parameters in the Arctic were assessed. Depending on the surface type and based on the modeling results, proposed are the for-mulas for calculating the T fields at the 6.9 GHz frequency at the enhanced spatial resolution, in which T at the 6.9 GHz frequency of the original resolution and T at the 36.5 GHz frequency of the Level 1R satellite product were used. Conclusions. The developed approach expands the possibilities of using the AMSR2 data for a detailed study of the parameters of Arctic seas partially or completely covered with first-year ice of various types and concentration. For the areas of continuous multi-year consolidate ice, application of the described method to improving the spatial resolution of measurements at 6.9 GHz, especially in vertical polariza-tion, seems impossible. The errors and applicability of the above approach are conditioned by the varia-bility of atmospheric water content parameters in a low spatial resolution pixel of measurements at the 6.9 GHz frequency.
AMSR2, brightness temperature, spatial resolution, Arctic, sea ice-ocean-atmosphere system, physical modeling, sea ice
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