New Data on Mud Volcanism in the Arctic on the Yamal Peninsula

Bogoyavlensky, V.I.

doi:10.1134/s1028334x23601116

Cited by 1 publication

(1 citation statement)

References 12 publications

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“…Gas accumulations are found at different depths within permafrost but are especially abundant at shallow levels above the Gas Hydrate Stability Zone (GHSZ) [13][14][15][16][17][18][19][20][21]. Intra-permafrost gas is an essential source of methane emissions from evolving permafrost, including the explosive emissions that produced particular craters discovered in northern West Siberia in the past decade [22][23][24][25][26]. Gas accumulation can be associated with various geocryological processes, such as penetration of gas into local reservoirs during the degradation of thermokarst lakes, the perennial freezing of ground, the migration of deep-seated gas through fractured permafrost, or gas release during the dissociation of gas hydrates [2,3].…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Frozen and Unfrozen Gas-Saturated Soils

Chuvilin,

Davletshina,

Bukhanov

et al. 2023

Geosciences

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Arctic permafrost often contains gas-saturated horizons. The gas component in freezing and frozen soils can exist under different pressures, which are expected to affect their properties and behavior. The effect of pore gas pressure on the thermal conductivity of frozen and unfrozen silt loam saturated with methane or carbon dioxide at pressures below the hydrate formation conditions is observed in the current study. The variable gas pressure and temperature conditions are simulated in a specially designed pressure cell, which allows thermal conductivity measuring in pressurized samples at positive and negative temperatures. The experiments using natural samples collected near the gas emission crater (Yamal Peninsula) show that thermal conductivity is sensitive to pore gas pressure even at high moisture contents. The thermal conductivity of methane-saturated soil becomes 4% and 6% higher in frozen and unfrozen samples, respectively, as the gas pressure increases from 0.1 MPa to 2 MPa. In the case of CO2 saturation, the respective thermal conductivity increase in frozen and unfrozen samples reaches 25% and 15% upon pressure change from 0.1 to 0.9 MPa. The results stimulate further special studies of the effects of gas type and pressure on the thermal properties of closed gas-saturated taliks, of which the pore pressure is increasing during freezing up.

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