ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 3, pp. 150-161

Determination of bottom gas liberation zones in fresh ice water areas according to radar and radiometric measurements data

G.S. Bordonskiy 1 , A.A. Gurulev 1 , S.D. Krylov 1 , A.O. Orlov 1 , S.V. Tsyrenzhapov 1 
1 Institute of Natural Resources, Ecology and Cryology SB RAS, Chita, Russia
Accepted: 09.03.2016
DOI: 10.21046/2070-7401-2016-13-3-150-161
The paper presents an experimental investigation of possibility of determining the zones of bottom gas liberation in water areas covered with fresh fast ice, using synthetic-aperture radar and surface microwave radiometric measurements under the conditions of rather weak bottom gas liberation. The object of research was a fresh eutrophicated Lake Shakshinskoye, one of the Ivan-Arakhley Lakes in Zabaikalsky krai, for which the processes of gas accumulation in ice cover had been studied before. In 1986-1989, microwave radiometric measurements for this reservoir were carried out and a radio image of the object at about 250 m spatial resolution in centimeter wave range was received. This radio image showed the areas with increased brightness temperature which were associated with accumulation of gases on ice-water border.
The present study analyzes the images received by SAR COSMO-SkyMed (March 9, 2012) and the radiometric image (March 27, 1989), as well as surface radiometric measurements from a car at 2.3 cm wavelength (March, 2015). Direct measurements of occluded gases concentration and their chemical composition in the ice areas based on radio physical measurements were performed. As an additional source of information, pictures of the ice cover surface in the near IR and visible bands for initial stage of ice formation were used.
We showed efficiency of joint radar and radiometric detection of occluded gases kept by ice at a low speed of their entry into ice ~ 0.1 l/m2 per day. Genesis of ice gases for this lake was determined and we made a conclusion on possible registration of gas accumulation areas during the spring period and ice melting not only based on static structures, but also during formation of specific structures, ice streamthroughs, representing areas of open water.
Keywords: ice cover, occluded gases, SAR, microwave radiometry
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