In situ measurements of the resistivity of Antarctic sea ice |
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| Affiliation: | 1. School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, Shanxi 710054, China;2. Department of Civil, Geological, and Mining Engineering, Ecole Polytechnique de Montreal, Research Institute on Mines and Environment (RIME) UQAT-Polytechnique, Montreal, QC H3C 3A7, Canada;3. CCCC First Highway Consultants Co., Ltd, Xi’an, Shanxi 710000, China;1. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, China Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Research and Development Centre, Snow and Avalanche Study Establishment (SASE), Him Parisar, Sector 37 A, Chandigarh 160036, India;2. Department of Physics, Panjab University Chandigarh, 160014, India;1. State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;2. Gansu Electric Power Design Institute, Lanzhou 730050, China |
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| Abstract: | The resistivity of first yea sea ice was measured in situ at two locations in McMurdo Sound, Antarctica using the Wenner array technique at audio frequencies. In addition, salinity and temperature profiles were measured. The results are adequately described by a three-layer model made up of a thin conducting surface layer, an insulating layer and finally sea water. The average resistivity of sea ice was found to lie in the range 50–200 Ω depending on salinity, structure and temperature. The resistivity and thicknesses of the surface layer could not be determined uniquely by the model but a maximum value for the resistivity as low as 4 Ω m was obtained. The resistivity of the surface layer was found to be influenced by the removal of the snow cover. The depth predicted by the Wenner sounding was found to be roughly 50% of the actual depth, a result that is consistent with a conductivity in the vertical direction and parallel to the brine channels of four times the conductivity in the horizontal direction within the bulk layer. |
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