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Temporal evolution of the structural properties of seasonal sea ice during the early melt season

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Title: Temporal evolution of the structural properties of seasonal sea ice during the early melt season
Authors: Ishii, Haruki Browse this author
Toyota, Takenobu Browse this author →KAKEN DB
Issue Date: Feb-2012
Publisher: International Glaciological Society
Journal Title: Journal of Glaciology
Volume: 58
Issue: 207
Start Page: 23
End Page: 37
Publisher DOI: 10.3189/2012JoG11J155
Abstract: During the early melt season, when sea-ice extent begins to retreat due to increasing heat absorption from the atmosphere and ocean, the sea ice becomes porous and weakens. This induces the break-up of ice floes and accelerates the melting process substantially. Determining how sea-ice structure evolves during this season is important for understanding the melting process on a global scale. We investigated this issue using field observations, laboratory experiments and numerical modeling, focusing on the effect of the C-shaped temperature profile on the internal structure of sea ice. Field observations were conducted to examine this effect on ~0.3 m thick ice on Lake Saroma, located at the coast of Hokkaido, Japan. To test the generalization from these observational case studies, laboratory experiments were conducted using a tank with 0.12 m thick ice. Additionally, evolution of ice structure from winter to early spring was numerically analyzed using meteorological data. From these studies, we find that the heat convergence, caused by the C-shape temperature profile, is essential to the internal melting particularly in the upper layer. This increases the porosity of the sea ice, leading to a rapid decrease in its flexural strength during the season.
Rights: © 2012 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: 豊田 威信

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