MONITORING OF THE METHANE CONCENTRATION CHANGES IN THE ARCTIC ATMOSPHERE IN 2019—2021 ACCORDING TO THE TROPOMI SPECTROMETER DATA

For the first time, the authors carried out a comprehensive analysis of changes in the atmospheric methane concentrations (AMC) over the land of the Circum-Arctic megaregion and the Yamal Peninsula according to the TROPOMI spectrometer in 2019—2021. They established that the average AMC in the mega-region was approximately 40—50 ppb below the global one for all three years, and also below the average for the Yamal Peninsula by 2—12 ppb. The authors revealed the regional features in the AMC changes, mainly depending on the air temperature near the earth’s surface, which affects the processes of methane emission. Despite a decrease in the AMC in most of Yamal, in relatively cold 2021, an anomalous increase in the AMC was detected in its central part, apparently associated with geological factors, including the migration of deep gas in the area of Lake Neito along faults in the gas-bearing structures of the Neytinskoye field. With the active expansion of hydrocarbon resources” development on the Yamal Peninsula, the share of the anthropogenic contribution in AMC changes seems to be negligible.

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