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Standardization of electromagnetic-induction measurements of sea-ice thickness in polar and subpolar seas

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Title: Standardization of electromagnetic-induction measurements of sea-ice thickness in polar and subpolar seas
Authors: Tateyama, K. Browse this author
Shirasawa, K. Browse this author →KAKEN DB
Uto, S. Browse this author
Kawamura, T. Browse this author
Toyota, T. Browse this author →KAKEN DB
Enomoto, H. Browse this author
Issue Date: Nov-2006
Publisher: International Glaciological Society
Journal Title: Annals of Glaciology
Volume: 44
Issue: 1
Start Page: 240
End Page: 246
Publisher DOI: 10.3189/172756406781811484
Abstract: Electromagnetic.induction (EM) instruments can be used to estimate sea-ice thickness because of the large contrast in the conductivities of sea ice and sea water, and are currently used in investigations of sea-ice thickness. In this study we analyze several snow, ice and sea-water samples and attempt to derive an appropriate formula to transform the apparent conductivity obtained from EM measurements to the total thickness of snow and ice for all regions and seasons. This was done to simplify the EM tuning procedure. Surface EM measurement transects with the instrument at varying heights above the ice were made in the Chukchi Sea, off East Antarctica, in the Sea of Okhotsk and in Saroma-ko (lagoon). A standardized transformation formula based on a one-dimensional multi-layer model was developed that also considers the effects of water-filled gaps between deformed ice, a saline snow slush layer, and the increase in the footprint size caused by increasing the instrument height. The overall average error in ice thickness determined with the standardized transform was <7%, and the regional average errors were 2.2% for the Arctic, 7.0% for the Antarctic, 6.5% for the Sea of Okhotsk and 4.4% for Saroma-ko.
Rights: © 2006 International Glaciological Society
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 白澤 邦男

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