Extended search
Structure, gas content and thermal state of perennial frost mounds (pingos) in the Vas-Yugan river valley (vicinity of Salekhard city, Western Siberia)
1 Federal Scientific Center «Arctic and Antarctic Research Institute», St. Petersburg, Russia
2 Lomonosov Moscow State University, Geological Faculty, Moscow, Russia
3 Institute of Limnology, Russian Academy of Sciences – St. Petersburg Federal Research Centre of the Russian Academy of Sciences, St. Petersburg, Russia
4 Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Moscow, Russia
Journal: Geophysical processes and biosphere
Tome: 21
Number: 3
Year: 2022
Pages: 27-38
UDK: 551.345
Show citation
Demidov N.E., Gunar A.Yu., Balihin E.I., Gagarin V.E., Guzeva A.V., Dezhnikova A.A., Kazantsev V.S., Koshurnikov A.V., Narizhnaya
A.I. Structure, gas content and thermal state of perennial frost mounds (pingos) in the Vas-Yugan river valley (vicinity of Salekhard city, Western Siberia) // . 2022. Т. 21. № 3. С. 27-38. DOI: https://doi.org/10.21455/GPB2022.3-4
@article{DemidovStructure,2022,
author = "Demidov, N. E. and Gunar, A. Yu. and Balihin, E. I. and Gagarin, V. E. and Guzeva, A. V. and Dezhnikova, A. A. and Kazantsev, V. S. and Koshurnikov, A. V. and Narizhnaya
, A. I.",
title = "Structure, gas content and thermal state of perennial frost mounds (pingos) in the Vas-Yugan river valley (vicinity of Salekhard city, Western Siberia)",
journal = "Geophysical processes and biosphere",
year = 2022,
volume = "21",
number = "3",
pages = "27-38",
doi = "https://doi.org/10.21455/GPB2022.3-4",
language = "English"
}
Copy link
Copy BibTex
Аnnotation: permafrost, bulgunyakh, pingo, methane in permafrost, Western Siberia, Salekhard.
Bibliography: Structure, gas content and thermal state of two perennial frost mounds or pingos (bulgunnyakhs in Russian) were studied in the Vasya-Yugan river valley near Salekhard, Western Siberia. Pingos are 2 and 4.5 m high with a diameter 55 and 100 m. 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 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. Low quantity of bubbles in the ice cores, laboratory tests of CH4 concentration in the cores and control of gas emission from borehole during drilling demonstrate no evident increase in gas concentrations in the pingo-forming rocks. Thermometric borehole, placed on one of the pingos, showed that the depth of zero temperature amplitude is 5.5 m. Shallow position of zero amplitude depth is explained by presence of a peat layer with thickness 0.3 m on the pingo surface. 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.
