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Precise dielectric profiling of ice cores: a new device with improved guarding and its theory

  • Frank Wilhelms (a1), Josef Kipfstuhl (a1), Heinz Miller (a2), Klaus Heinloth (a2) and John Firestone (a1)...

Abstract

Dielectric profiling (DEP), a capacitive method for measuring an ice core’s electrical conductivity and permittivity, has been in use for several years. We have built an improved DEP instrument with a modified guarded-electrode geometry whose capacitance can be determined from potential theory. The new instrument can measure an ice core’s conductivity and permittivity to within a few per cent error, a high enough accuracy to infer its density using well-known models.

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References

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