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Title: Sea salt dependent electrical conduction in polar ice

Abstract

A 45 m length of ice core from Dolleman Island, Antarctic Peninsula has been dielectrically analyzed at 5 cm resolution using the dielectric profiling (DEP) technique. The core has also been chemically analyzed for major ionic impurities. A statistical analysis of the measurements shows that the LF (low frequency) conductivity is determined both by neutral salt and acid concentrations. The statistical relationships have been compared with results from laboratory experiments on ice doped with HF (hydrogen fluoride). Salts (probably dispersed throughout the ice fabric) determine the dielectric conductivity. The salt conduction mechanism is probably due to Bjerrum L defects alone, created by the incorporation of chloride ions in the lattice. Samples of ice from beneath the Filchner-Ronne Ice Shelf were also measured and display a similar conduction mechanism below a solubility limit of about 400 [mu]M of chloride. The temperature dependence of the neutral salt, acid and pure ice contributions to the LF conductivity of natural ice between [approximately] 70[degrees]C and 0[degrees]C is discussed. These results allow a comprehensive comparison of dielectric and chemical data from natural ice.

Authors:
;  [1];  [2]
  1. Natural Environment Research Council, Cambridge (United Kingdom)
  2. Alfred Wegener Inst. for Polar and Marine Research, Bremerhaven (Germany)
Publication Date:
OSTI Identifier:
6763725
Resource Type:
Journal Article
Journal Name:
Journal of Geophysical Research; (United States)
Additional Journal Information:
Journal Volume: 97:B13; Journal ID: ISSN 0148-0227
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ICE; ELECTRIC CONDUCTIVITY; IMPURITIES; CHEMICAL ANALYSIS; DIELECTRIC PROPERTIES; CHLORIDES; IONS; RESOLUTION; SALTS; SOLUBILITY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K; CHARGED PARTICLES; CHLORINE COMPOUNDS; ELECTRICAL PROPERTIES; HALIDES; HALOGEN COMPOUNDS; PHYSICAL PROPERTIES; TEMPERATURE RANGE; 540220* - Environment, Terrestrial- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Moore, J, Paren, J, and Oerter, H. Sea salt dependent electrical conduction in polar ice. United States: N. p., 1992. Web. doi:10.1029/92JB01872.
Moore, J, Paren, J, & Oerter, H. Sea salt dependent electrical conduction in polar ice. United States. https://doi.org/10.1029/92JB01872
Moore, J, Paren, J, and Oerter, H. 1992. "Sea salt dependent electrical conduction in polar ice". United States. https://doi.org/10.1029/92JB01872.
@article{osti_6763725,
title = {Sea salt dependent electrical conduction in polar ice},
author = {Moore, J and Paren, J and Oerter, H},
abstractNote = {A 45 m length of ice core from Dolleman Island, Antarctic Peninsula has been dielectrically analyzed at 5 cm resolution using the dielectric profiling (DEP) technique. The core has also been chemically analyzed for major ionic impurities. A statistical analysis of the measurements shows that the LF (low frequency) conductivity is determined both by neutral salt and acid concentrations. The statistical relationships have been compared with results from laboratory experiments on ice doped with HF (hydrogen fluoride). Salts (probably dispersed throughout the ice fabric) determine the dielectric conductivity. The salt conduction mechanism is probably due to Bjerrum L defects alone, created by the incorporation of chloride ions in the lattice. Samples of ice from beneath the Filchner-Ronne Ice Shelf were also measured and display a similar conduction mechanism below a solubility limit of about 400 [mu]M of chloride. The temperature dependence of the neutral salt, acid and pure ice contributions to the LF conductivity of natural ice between [approximately] 70[degrees]C and 0[degrees]C is discussed. These results allow a comprehensive comparison of dielectric and chemical data from natural ice.},
doi = {10.1029/92JB01872},
url = {https://www.osti.gov/biblio/6763725}, journal = {Journal of Geophysical Research; (United States)},
issn = {0148-0227},
number = ,
volume = 97:B13,
place = {United States},
year = {Thu Dec 10 00:00:00 EST 1992},
month = {Thu Dec 10 00:00:00 EST 1992}
}