The role of acids in electrical conduction through ice
Article first published online: 24 JAN 2013
©2012. American Geophysical Union. All Rights Reserved.
Journal of Geophysical Research: Earth Surface
Volume 118, Issue 1, pages 1–16, March 2013
How to Cite
2013), The role of acids in electrical conduction through ice, J. Geophys. Res. Earth Surf., 118, 1–16, doi:10.1029/2012JF002603., , and (
- Issue published online: 24 APR 2013
- Article first published online: 24 JAN 2013
- Manuscript Accepted: 1 DEC 2012
- Manuscript Revised: 20 NOV 2012
- Manuscript Received: 24 AUG 2012
- Planetary Geology and Geophysics Program, National Aeronautics and Space Administration. Grant Numbers: NNX10AJ65G, NNX08AM92G
- electrical Properties;
- Jaccard Theory
 Electrical conduction through meteoric polar ice is controlled by soluble impurities that originate mostly from sea salt, biomass burning, and volcanic eruptions. The strongest conductivity response is to acids, yet the mechanism causing this response has been unclear. Here we elucidate conduction mechanisms in ice using broadband dielectric spectroscopy of meteoric polar ice cores. We find that conduction through polycrystalline polar ice is consistent with Jaccard theory for migration of charged protonic point defects through single ice crystals, except that bulk DC conduction is impeded by grain boundaries. Neither our observations nor modeling using Archie's Law support the hypothesis that grain-boundary networks of unfrozen acids cause significant electrolytic conduction. Common electrical logs of ice cores (by electrical conductivity measurement [ECM] or dielectric profiling [DEP]) and the attenuation of radio waves in ice sheets thus respond to protonic point defects only. This response implies that joint interpretation of electrical and chemical logs can determine impurity partitioning between the lattice and grain boundaries or inclusions. For example, in the Greenland Ice Core Project (GRIP) ice core from central Greenland, on average more than half of the available lattice-soluble impurities (H+, Cl–, NH4+) create defects. Understanding this partitioning could help further resolve the nature of past changes in atmospheric chemistry.