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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, 2021, Vol. 18, No. 6, pp. 185-199

Interannual variation of microwave radiation of the Gulf of Ob during the freezing season and relationship to hydrological and climate changes in the region

V.V. Tikhonov 1, 2 , A.N. Romanov 2 , I.V. Khvostov 2 , T.A. Alekseeva 3, 1 , A.I. Sinitskiy 4 , M.V. Tikhonova 5 , E.A. Sharkov 1 , N.Yu. Komarova 1 
1 Space Research Institute RAS, Moscow, Russia
2 Institute for Water and Environmental Problems SB RAS, Barnaul, Russia
3 Arctic and Antarctic Research Institute, Saint Petersburg, Russia
4 LLP GEOINGSERVICE, Moscow, Russia
5 Russian State Agrarian University — Moscow Timiryazev Agricultural Academy, Moscow, Russia
Accepted: 02.11.2021
DOI: 10.21046/2070-7401-2021-18-6-185-199
The article presents an analysis of seasonal and interannual variations of brightness temperature in different areas of the Gulf of Ob during the freezing season obtained from SMOS (Soil Moisture and Ocean Salinity) satellite data. The studies showed that in the southern part of the Gulf of Ob, the seasonal and interannual brightness temperature dynamics are similar to those of freshwater lakes. However, closer to the Kara Sea these dynamics are broken and in the northern part of the bay become similar to the brightness temperature dynamics of the central Kara Sea. Changes in the seasonal brightness temperature dynamics in different areas of the Gulf of Ob occur during the freezing period. They are explained by an increase in the salinity of water under ice. The studies show that during winter seasons, the mixing area of fresh and salt waters (transition zone) can shift far to the south of the Gulf of Ob. The winter shift of the transition zone is compared with climate changes in the region and in the Ob River basin that determine the river runoff and the state of permafrost. The revealed patterns of seasonal and interannual variations of brightness temperature in different areas of the Gulf of Ob and the associated phases of ice cover can be used to assess the hydrological regime in large estuaries of the Arctic in winter as well as climate changes in the adjacent areas from satellite microwave radiometry.
Keywords: satellite microwave radiometry, brightness temperature, estuary, ice cover, water mixing, hydrological regime, water salinity
Full text

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