Freezing point and unfrozen water contents of permafrost soils: Estimation by the water potential method

Chuvilin, Evgeny; Bukhanov, Boris; Mukhametdinova, Aliya; Grechishcheva, Erika; Sokolova, Natalia; Alekseev, Alexey; Истомин, В. А.

doi:10.1016/j.coldregions.2022.103488

Cited by 20 publications

(13 citation statements)

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“…The method was applied to laboratory soil samples across a large range of negative temperatures reaching −15 • C and to natural samples collected during geological engineering surveys in northern West Siberia. The results agree well with data from other methods, including NMR and contact measurements, which are especially widespread in Russia [78].…”

Section: Water Potential Methods and Its Advantagessupporting

confidence: 88%

“…The water potential method is advantageous for estimating the amount of unfrozen pore water in permafrost [74][75][76][77][78]. It consists of measurements of pore water potential (or water activity) in samples with stepwise decreasing water content and subsequent thermodynamic calculations using measured data.…”

Section: Water Potential Methods and Its Advantagesmentioning

confidence: 99%

“…It consists of measurements of pore water potential (or water activity) in samples with stepwise decreasing water content and subsequent thermodynamic calculations using measured data. The instruments used in this method provide automatic monitoring of measured water potential, which saves time and allows express measurements [78]. The method was applied to laboratory soil samples across a large range of negative temperatures reaching −15 • C and to natural samples collected during geological engineering surveys in northern West Siberia.…”

Section: Water Potential Methods and Its Advantagesmentioning

confidence: 99%

“…Water activity (α) can be estimated by direct measurement at +25 • C or by thermodynamic calculations, as per [78].…”

Section: Water Potential Methods and Its Advantagesmentioning

confidence: 99%

“…Cryoscopy [15] Calorimetry [53][54][55][56][57] Plasticity, temperature, and salinity [39,40,53] Nuclear Magnetic Resonance (NMR) [58][59][60][61][62][63] Total moisture and grain size [50] Hygroscopic absorption [64] Time domain reflectometry (TDR) [65][66][67][68][69][70] Pore pressure [41] Thermometry [35,71] Specific surface area [42][43][44] Sublimation [72] Desorption [27,73] Total moisture and heat capacity [46] Water potential [74][75][76][77][78] Total moisture, ground temperature, and freezing point [47,48] Contact [19] Freezing point and unfreezable water content [49] The references are to papers where the respective methods were first described.…”

Section: Modeling Using Empirical Relationships With Other Soil Varia...mentioning

confidence: 99%

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Changes in Unfrozen Water Contents in Warming Permafrost Soils

2022

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Climate warming in the Arctic, accompanied by changes in permafrost soil properties (mechanical, thermal, filtration, geophysical), is due to increasing unfrozen pore water content. The liquid component in frozen soils is an issue of key importance for permafrost engineering that has been extensively studied since the beginning of the 20th century. We suggest a synthesis and new classification of various experimental and calculation methods for the determination of unfrozen water content. Special focus is placed on the method of applying measurements to the water potential, which reveals the impact of permafrost warming on unfrozen water content. This method was applied to natural soil samples collected from shallow permafrost from northern West Siberia affected by climate change, and confirms the revealed trends. The obtained results confirm that unfrozen water content is sensitive not only temperature but also particle size distribution, salinity, and the organic matter content of permafrost soils.

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Section: Water Potential Methods and Its Advantagessupporting

confidence: 88%

Section: Water Potential Methods and Its Advantagesmentioning

confidence: 99%

Section: Water Potential Methods and Its Advantagesmentioning

confidence: 99%

“…Water activity (α) can be estimated by direct measurement at +25 • C or by thermodynamic calculations, as per [78].…”

Section: Water Potential Methods and Its Advantagesmentioning

confidence: 99%