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Ship-borne electromagnetic induction sounding of sea-ice thickness in the southern Sea of Okhotsk

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Title: Ship-borne electromagnetic induction sounding of sea-ice thickness in the southern Sea of Okhotsk
Authors: Uto, Shotaro Browse this author
Toyota, Takenobu Browse this author →KAKEN DB
Shimoda, Haruhito Browse this author
Tateyama, Kazutaka Browse this author
Shirasawa, Kunio Browse this author →KAKEN DB
Issue Date: Nov-2006
Publisher: International Glaciological Society
Journal Title: Annals of Glaciology
Volume: 44
Issue: 1
Start Page: 253
End Page: 260
Publisher DOI: 10.3189/172756406781811510
Abstract: Recent observations have revealed that dynamical thickening is dominant in the growth process of sea ice in the southern Sea of Okhotsk. That indicates the importance of understanding the nature of thick deformed ice in this area. The objective of the present paper is to establish a ship-based method for observing the thickness of deformed ice with reasonable accuracy. Since February 2003, one of the authors has engaged in the core sampling using a small basket from the icebreaker Soya. Based on these results, we developed a new model which expressed the internal structure of pack ice in the southern Sea of Okhotsk, as a one-dimensional multilayered structure. Since 2004, the electromagnetic (EM) inductive sounding of sea-ice thickness has been conducted on board Soya. By combining the model and theoretical calculations, a new algorithm was developed for transforming the output of the EM inductive instrument to ice + snow thickness (total thickness). Comparison with total thickness by drillhole observations showed fair agreement. The probability density functions of total thickness in 2004 and 2005 showed some difference, which reflected the difference of fractions of thick deformed ice.
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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