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The electrical resistivity of soils varies with the temperature. While above freezing the resistivity increases by about 2%/°C with decreasing temperature, below freezing that can be >50%/°C, showing the high sensitivity of electrical measurements to the thermal state of permafrost. This is also why electrical resistivity tomography is often used to map the state and fate of permafrost.
The electrical resistivity of soils varies with the temperature. While above freezing the resistivity increases by about 2%/°C with decreasing temperature, below freezing that can be >50%/°C, showing the high sensitivity of electrical measurements to the thermal state of permafrost. This is also why electrical resistivity tomography is often used to map the state and fate of permafrost.
3D_Teller.mp4Imaging the complex processes of Arctic landscapes
Imaging the complex processes of Arctic landscapes
In permafrost environments, repeated electrical resistivity tomography surveys, i.e., geoelectrical monitoring, can show how permafrost is responding to weather events and climate change. If you want to know more, take a look at our publication.
The video on the right shows how surface and subsurface features co-vary in this landscapes. Topographic highs, underlain by permafrost show very high resistivities, whereas lows, often filled with water, show low resistivities. Over time, the data shows groundwater dynamics below the permafrost.
Monitoring systems installed in the Arctic have to withstand harsh conditions, must be low-powered due to a lack of sun or just bad weather, and should be robust enough so that they don't break when a bear or musk ox decides to play with them.
The system was installed in 2019 and has been collecting data daily, despite these conditions. The video shows some impressions of a usual day on the Seward Peninsula.
Teller_Cam.mp4Page updated
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