Abstract
Seasonal temperature fluctuations in frozen soils cause changes in their ice content which are accompanied by resistivity changes and electromagnetic emission. This study examines the periodic seasonal variation in apparent resistivity of permafrost soils based on field measurements of the surface impedance in the 100–1000 kHz frequency range. The characteristic changes in soil temperature and apparent resistivity associated with particular time periods are presented. The data show that the apparent resistivity values are consistent with the degree of soil freezing. Rapid freezing or thawing of the active layer causes electromagnetic emission in frozen soils. These features can be used to monitor and predict changes in permafrost conditionsunder climatic or anthropogenic impacts.
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