The Low Frequency Electrical Properties of Sea Ice
This thesis summarises an experimental and theoretical study of the low frequency electrical properties of sea ice. The aim of the research was to first demonstrate, and then gain a physical understanding of, the microstructural dependence of a sea ice impedance measurement. In particular, we sought...
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ftvictoriauwfig:oai:figshare.com:article/16972213 2023-05-15T18:16:33+02:00 The Low Frequency Electrical Properties of Sea Ice Buchanan, Sean Thomas 2010-01-01T00:00:00Z https://doi.org/10.26686/wgtn.16972213.v1 https://figshare.com/articles/thesis/The_Low_Frequency_Electrical_Properties_of_Sea_Ice/16972213 unknown doi:10.26686/wgtn.16972213.v1 https://figshare.com/articles/thesis/The_Low_Frequency_Electrical_Properties_of_Sea_Ice/16972213 Author Retains Copyright Earth Sciences not elsewhere classified Sea ice Electrical Microstructure School: School of Chemical and Physical Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260203 Electromagnetism Marsden: 249903 Instruments and Techniques Marsden: 260403 Physical Oceanography Marsden: 240504 Electrostatics and Electrodynamics Degree Discipline: Physics Degree Level: Masters Degree Name: Master of Science Text Thesis 2010 ftvictoriauwfig https://doi.org/10.26686/wgtn.16972213.v1 2021-11-11T00:03:12Z This thesis summarises an experimental and theoretical study of the low frequency electrical properties of sea ice. The aim of the research was to first demonstrate, and then gain a physical understanding of, the microstructural dependence of a sea ice impedance measurement. In particular, we sought to realise how the effective electrical properties of the medium depended on the volume fraction, orientation, dimensions, and connectivity of the dispersed brine phase. The experimental portion of the project was performed on laboratory grown, artificial sea ice. We monitored the variation with time, and temperature, of the broadband sea ice impedance using four-electrode measurement cells embedded within the ice. The four-electrode measurement allowed us to realise and eliminate the contribution of electrode polarization to the measured impedance. By representing the electrical response of sea ice as a complex conductivity, we formulated a broadband physical model to describe the medium. The model distinguished bulk conduction, bulk polarization, and interfacial polarization. A complex non-linear least squares fitting procedure revealed the individual contribution of these physical processes and we studied their variation with temperature. We found that the bulk material underwent a dielectric relaxation with activation energy Ea = 0.20 + and - 0.04eV. We linked the bulk material properties with a two phase microstructural model, with realistic input parameters. Thesis Sea ice Open Access Victoria University of Wellington / Te Herenga Waka Marsden ENVELOPE(66.067,66.067,-67.867,-67.867) |
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Open Access Victoria University of Wellington / Te Herenga Waka |
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Earth Sciences not elsewhere classified Sea ice Electrical Microstructure School: School of Chemical and Physical Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260203 Electromagnetism Marsden: 249903 Instruments and Techniques Marsden: 260403 Physical Oceanography Marsden: 240504 Electrostatics and Electrodynamics Degree Discipline: Physics Degree Level: Masters Degree Name: Master of Science |
spellingShingle |
Earth Sciences not elsewhere classified Sea ice Electrical Microstructure School: School of Chemical and Physical Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260203 Electromagnetism Marsden: 249903 Instruments and Techniques Marsden: 260403 Physical Oceanography Marsden: 240504 Electrostatics and Electrodynamics Degree Discipline: Physics Degree Level: Masters Degree Name: Master of Science Buchanan, Sean Thomas The Low Frequency Electrical Properties of Sea Ice |
topic_facet |
Earth Sciences not elsewhere classified Sea ice Electrical Microstructure School: School of Chemical and Physical Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260203 Electromagnetism Marsden: 249903 Instruments and Techniques Marsden: 260403 Physical Oceanography Marsden: 240504 Electrostatics and Electrodynamics Degree Discipline: Physics Degree Level: Masters Degree Name: Master of Science |
description |
This thesis summarises an experimental and theoretical study of the low frequency electrical properties of sea ice. The aim of the research was to first demonstrate, and then gain a physical understanding of, the microstructural dependence of a sea ice impedance measurement. In particular, we sought to realise how the effective electrical properties of the medium depended on the volume fraction, orientation, dimensions, and connectivity of the dispersed brine phase. The experimental portion of the project was performed on laboratory grown, artificial sea ice. We monitored the variation with time, and temperature, of the broadband sea ice impedance using four-electrode measurement cells embedded within the ice. The four-electrode measurement allowed us to realise and eliminate the contribution of electrode polarization to the measured impedance. By representing the electrical response of sea ice as a complex conductivity, we formulated a broadband physical model to describe the medium. The model distinguished bulk conduction, bulk polarization, and interfacial polarization. A complex non-linear least squares fitting procedure revealed the individual contribution of these physical processes and we studied their variation with temperature. We found that the bulk material underwent a dielectric relaxation with activation energy Ea = 0.20 + and - 0.04eV. We linked the bulk material properties with a two phase microstructural model, with realistic input parameters. |
format |
Thesis |
author |
Buchanan, Sean Thomas |
author_facet |
Buchanan, Sean Thomas |
author_sort |
Buchanan, Sean Thomas |
title |
The Low Frequency Electrical Properties of Sea Ice |
title_short |
The Low Frequency Electrical Properties of Sea Ice |
title_full |
The Low Frequency Electrical Properties of Sea Ice |
title_fullStr |
The Low Frequency Electrical Properties of Sea Ice |
title_full_unstemmed |
The Low Frequency Electrical Properties of Sea Ice |
title_sort |
low frequency electrical properties of sea ice |
publishDate |
2010 |
url |
https://doi.org/10.26686/wgtn.16972213.v1 https://figshare.com/articles/thesis/The_Low_Frequency_Electrical_Properties_of_Sea_Ice/16972213 |
long_lat |
ENVELOPE(66.067,66.067,-67.867,-67.867) |
geographic |
Marsden |
geographic_facet |
Marsden |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
doi:10.26686/wgtn.16972213.v1 https://figshare.com/articles/thesis/The_Low_Frequency_Electrical_Properties_of_Sea_Ice/16972213 |
op_rights |
Author Retains Copyright |
op_doi |
https://doi.org/10.26686/wgtn.16972213.v1 |
_version_ |
1766190230731227136 |