Detection of gas outlet in lake Shakshinskoe (Trans-Baikal territory) by remote methods

The degradation of permafrost in the Arctic zone contributes to the active release of gases from the bowels of the Earth. A similar process is observed in temperate latitudes, for example, in Transbaikalia. The paper presents the results of satellite and subsatellite measurements on the lake. Shakshinskoe, located in the Trans-Baikal Territory. From artificial Earth satellites in the thermal infrared range in the center of the reservoir in 2021, in the summer period, an increased temperature value of 3 °C ... 4 °C of the surface waters of the reservoir with an area of about 0.07 km2 with a total lake area of 52 km2 was recorded. We associate this effect with the abundant release of gas from the bowels of the Earth, the active release of which was previously prevented by permafrost rocks. Apparently, their melting took place. In March 2022 full-scale measurements of the anomalous area of the reservoir were performed, which consisted of: taking gas samples from under the ice to conduct its chemical analysis; radiometric studies of the ice cover in the microwave range. The results showed that this gas contains nitrogen (up to 98 %) and some heavy hydrocarbons. The value of the radio brightness temperature in the centimeter wavelength range of the ice cover in this area was of increased importance, which is associated with the presence of an increased content of gas inclusions in the ice cover, which was captured at the time of its formation.