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Thickness distribution, texture and stratigraphy, and a simple probabilistic model for dynamical thickening of sea ice in the southern Sea of Okhotsk

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Title: Thickness distribution, texture and stratigraphy, and a simple probabilistic model for dynamical thickening of sea ice in the southern Sea of Okhotsk
Authors: Toyota, Takenobu1 Browse this author →KAKEN DB
Kawamura, Toshiyuki Browse this author
Ohshima, Kay I. Browse this author →KAKEN DB
Shimoda, Haruhito Browse this author
Wakatsuchi, Masaaki Browse this author
Authors(alt): 豊田, 威信1
Keywords: sea ice
Okhotsk Sea
ice growth process
Issue Date: 2-Jun-2004
Publisher: American Geophysical Union
Journal Title: Journal of Geophisical Research
Volume: 109
Start Page: C06001
Publisher DOI: 10.1029/2003JC002090
Abstract: Sea ice thickness data and sea ice samples were analyzed to examine the characteristics of the ice thickness distribution and ice texture, and to understand ice growth processes in the southern Sea of Okhotsk. Ice thickness data and samples were obtained aboard the icebreaker Soya in early February, the ice growth season. Ice thickness data, which were obtained with a video monitoring system installed on the side deck of the ship each winter from 1991 to 2000 except 1995, show that the average thickness ranges from 19±7 to 55±23 cm and that it matches the characteristics of a Poisson distribution. Ice structure analysis reveals that granular texture occupies about three quarters of the total ice thickness and that the ice exhibits a layered structure with unit thickness averaging 5 to 10 cm. Stratigraphy and stable isotopic composition of the ice indicate that snow ice accounts for 10% and frazil ice accounts for 64% of the total ice thickness. This suggests that dynamic ice thickening processes such as frazil ice growth and piling up are more significant than congelation growth. On the basis of these characteristics, which resemble more those of Antarctic than Arctic sea ice, we propose a conceptual model for the ice thickening process in this region. It is shown that this model can explain the shape of the ice thickness distribution well, and is analogous with the concept of the “pancake cycle” and multiple rafting of Antarctic sea ice growth and thickening.
Description: An edited version of this paper was published by AGU. Copyright 2004, American Geophysical Union, "Journal Of Geophysical Research-oceans", Vol.109
Type: article (author version)
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: 豊田 威信

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