Structure, Gas Content, and Thermal State of Perennial Frost Mounds (Pingos) in the Vas-Yugan River Valley (Vicinity of the City of Salekhard, Western Siberia)

Демидов, Н.Э.; Гунар, А.Ю.; Балихин, Е.И.; Гагарин, В.Е.; Гузева, А.В.; Дежникова, А.А.; Казанцев, В.С.; Кошурников, А.В.; Нарижная, А.И.

Авторы: Демидов Н.Э., Гунар А.Ю., Балихин Е.И., Гагарин В.Е., Гузева А.В., Дежникова А.А., Казанцев В.С., Кошурников А.В., Нарижная А.И.
Журнал: Isvestia, Atmospheric and Oceanic Physics
Том: 28
Номер: 10
Год издания: 2022
Первая страница: 1226
Последняя страница: 1235
DOI: 10.1134/S0001433822100036
Аннотация: The structure, gas content, and thermal state of two perennial frost mounds, or pingos (bulgun-nyakhs in Russian), have been studied in the Vas-Yugan river valley near Salekhard, Western Siberia. The pingos are 2 and 4.5 m high with a diameter of 55 and 100 m. The cores are represented by the interbedding of ice and loam with a total thickness of 5–6 m, being overlaid by fine sands. The bases of the ice cores are frozen, and the pingos have completed their growth stage. During the growth of the pingos, segregated and intrusive ice formation stages alternated. Due to the influence of hydraulic fracturing, loam-enriched water penetrated into coarse-crystalline ice through cracks, forming secondary mineral inclusions. The low quantity of bubbles in the ice cores, laboratory tests of CH4 concentration in the cores, and the control of gas emission from the borehole during drilling demonstrate no evident increase in gas concentrations in the pingo-forming rocks. The thermometric borehole, placed on one of the pingos, showed that the depth of zero temperature amplitude is 5.5 m. The shallow position of the depth of zero amplitude is explained by the presence of a peat layer with a thickness of 0.3 m on the pingo surface. The average annual temperature at the depth of zero amplitude is –0.5°C, which is close to the temperature at which soil begins to thaw. Taking into account the presence of massive ice, pingos may undergo degradation according to the thermokarst scenario under conditions of warming climate, but do not pose danger of gas explosion.
Добавил в систему: Гагарин Владимир Евгеньевич

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Structure, Gas Content, and Thermal State of Perennial Frost Mounds (Pingos) in the Vas-Yugan River Valley (Vicinity of the City of Salekhard, Western Siberia)статья

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