Antarctic sea ice thickness measurements using a ship-borne electromagnetic induction device

J. E. Reid; J. Vrbancich; A. P. Worby

doi:10.1071/ASEG2001ab118

ISSN: 2202-0586
E-ISSN:

oa Antarctic sea ice thickness measurements using a ship-borne electromagnetic induction device
Authors J. E. Reid^a, J. Vrbancich^b and A. P. Worby^c
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^a School of Earth SciencesUniversity of Tasmania, Australia, [email protected] ^b Maritime Operations Division Defence Science and Technology Organisation, Australia, [email protected] ^c Australian Antarctic Division/Antarctic CRCUniversity of Tasmania, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2001, Issue ASEG2001 - 15th Geophysical Conference, Dec 2001, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2001ab118
- Published online: 01 Dec 2001

Abstract

We perform a theoretical analysis of Antarctic sea ice thickness estimates made using a ship-borne electromagnetic instrument. Inversion of theoretical one-dimensional sea ice models assuming a conductive half-space model has shown that the ship-borne system is able to determine thickness to within 10% for level ice up to -2 m thick. However, the presence of a thin conducting brine layer within the ice, common during the Antarctic summer, results in a large error in thicknesses estimated assuming perfectly-resistive ice.

An analysis of the effect of system attitude on the electromagnetic response has shown that pitch and roll of up to 10° can result in significant errors in the interpreted ice thickness in areas of thin sea ice.

A preliminary three-dimensional model study of the EM-31 system has shown that it can yield good estimates of maximum sea ice keel thickness. However, sea ice thickness is significantly over- or underestimated near sharp vertical boundaries in the three-dimensional model.

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References

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Haas, C., 1998, Evaluation of ship-based electromagnetic-inductive thickness measurements of summer sea-ice in the Bellingshausen and Amundsen Seas, Antarctica: Cold Regions Science and Technology, 27, 1-16.
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Reid, J. E., and Howlett, A., 2001, Application of the EM-31 terrain conductivity meter in conductive regimes: Australian Society of Exploration Geophysicists 15th Conference, Expanded Abstracts.
Soininen, H., Jokinen, T., Oksama, M. and Suppala, I., 1998, Sea ice thickness mapping by airborne and ground EM methods: Exploration Geophysics, 29, 244-248.
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Worby, A. P., Griffin, P. W., Lytle, V. I. and Massom, R. A., 1999, On the use of electromagnetic induction sounding to determine winter and spring sea ice thickness in the Antarctic: Cold Regions Science and Technology, 29, 49-58.
Zhdanov, M. S. and Keller, G. V., 1994, The geoelectrical methods in geophysical exploration: Methods in Geochemistry and Geophysics, 31, 507-534.

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Article Type: Research Article

Keyword(s): EM-31; inversion; sea ice thickness

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