Hydrology and Land Surface Studies
Low temperature dependence of electrical resistivity: Implications for near surface geophysical monitoring
Article first published online: 18 SEP 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 18, September 2007
How to Cite
2007), Low temperature dependence of electrical resistivity: Implications for near surface geophysical monitoring, Geophys. Res. Lett., 34, L18402, doi:10.1029/2007GL031124., , , and (
- Issue published online: 18 SEP 2007
- Article first published online: 18 SEP 2007
- Manuscript Accepted: 17 AUG 2007
- Manuscript Revised: 4 AUG 2007
- Manuscript Received: 27 JUN 2007
- electrical conductivity
 Electrical resistivity imaging surveys are used to monitor variations in pore fluid chemistry and saturation as well as time-lapse changes. Temperature variations in the near surface can produce larger magnitude changes in electrical conductivity than changes due to slow moving solute plumes or spatial variations in chemistry and soil moisture. Relationships between temperature and electrical conductivity based on previous studies conducted over 25–200°C do not explain 0–25°C laboratory data. A modification to the temperature dependence within a petrophysical model is proposed that may allow general application over this temperature range. An empirical linear approximation of 1.8 to 2.2 percent change in bulk electrical conductivity per degree C is consistent with low temperature electrical conductivity studies and the predictions of the petrophysical model used. This relationship can be used to account for the effect of temperature variations within individual images or time-lapse difference images.