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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, 2022, Vol. 19, No. 1, pp. 27-38

Sea ice concentration retrieval from MTVZA GYa measurements

E.V. Zabolotskikh 1 , E.A. Balashova 1 , S.M. Azarov 1 
1 Russian State Hydrometeorological University, Saint Petersburg, Russia
Accepted: 29.11.2021
DOI: 10.21046/2070-7401-2022-19-1-27-38
Sea ice concentration (SIC) retrievals from measurements of the Russian microwave imager/sounder MTVZA GYa, based on polarization difference (PD) in the measurements of the sea ice – ocean – atmosphere system microwave radiation at frequencies of 10.6 and 36.7 GHz, are discussed. A joint analysis of the MTVZA GYa measurements and the measurements of the Japanese instrument Advanced Microwave Scanning Radiometer 2 (AMSR2) at similar frequencies over sea ice and open water is carried out. SIC satellite product based on polarization measurements of AMSR2 at 89 GHz is used to define the surface type. The possibility of classification of surface as sea ice or open water using PD values at 10.6 or 36.7 GHz has been demonstrated. The formulas are presented to calculate SIC from MTVZA GYa data using predetermined PD values at 10.6 and 36.7 GHz over open water and over sea ice (tie points). Experimental values of the gradient ratios in the measurements of vertically polarized radiation at 18.7, 23.8 and 36.5 GHz are determined to manage weather effects and remove spurious sea ice areas. The results of SIC retrievals from MTVZA GYa data are compared with the results of application of the SIC retrieval algorithm to the AMSR2 data for the Greenland, Barents and Kara Seas. Additional high-resolution satellite data are subjectively analyzed to confirm the adequateness of SIC fields and show that for some areas the MTVZA GYa SIC retrievals allow avoiding SIC underestimation by traditional algorithms based on measurements near 90 GHz.
Keywords: sea ice concentration, algorithms, Arctic, satellite microwave radiometers, MTVZA GYa, AMSR2
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