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Temporal evolution of the structural properties of seasonal sea ice during the early melt season
| 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 |
| Relation: | http://www.igsoc.org/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/49686 |
| 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)
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Submitter: 豊田 威信
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