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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, 2023, Vol. 20, No. 1, pp. 219-228

Identification of areas of hummocking of freshwater ice cover by its own thermal radiation

A.A. Gurulev 1 , A.O. Orlov 1 , S.V. Tsyrenzhapov 1 , V.A. Kazantsev 1 , A.K. Kozlov 1 
1 Institute of Natural Resources, Ecology and Cryology SB RAS, Chita, Russia
Accepted: 09.01.2023
DOI: 10.21046/2070-7401-2023-20-1-219-228
The paper presents the results of radiometric measurements in the microwave and infrared (IR) ranges in areas of freshwater ice hummocking, using the example of the Ivano-Arakhlei lakes located in the Trans-Baikal Territory. It is shown that in the centimeter and IR ranges there is an increase in the power of the ice own thermal radiation in the area where ice hummocks are observed. At the same time, it decreases in the millimeter range, as measurements at a wavelength of 8.8 mm show. This fact can be explained by the presence of cracks in the area of hummocking of the ice cover, through which moisture escapes and heat is transferred, leading to an increase in the temperature of the upper layers and the formation of sublimation ice crystals. They are commensurate with the wavelength of the millimeter range, which leads to an increase in the scattering of radiation, and, accordingly, to a decrease in the brightness temperature in this range. According to satellite images from Landsat-8 bands 10 and 11, an increase in brightness temperature is also observed in places where the ice cover of the Ivano-Arakhlei lakes is hummocked, but this effect is not observed on Lake Baikal. On the contrary, in the latter case, there is an insignificant decrease in the temperature value in the region of hummocks. We explain this effect by the presence of wind action on the freshwater ice cover, which cools the object under study.
Keywords: microwave range, hummocks, freshwater ice cover, radiometry, Landsat-8, IR range
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