2021 Fiscal Year Final Research Report
Development of the parameterization of sea ice deformation processes based on the year-round comprehensive data in the Arctic Ocean
| Project/Area Number |
19K12304
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 63010:Environmental dynamic analysis-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
木村 詞明 東京大学, 大気海洋研究所, 特任研究員 (20374647)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 海氷力学過程 / 北極海 / リモートセンシング / レオロジー / パラメタリゼーション / 海氷漂流速度 / 数値海氷モデル / 氷厚分布 |
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| Outline of Final Research Achievements |
To improve the accuracy of numerical sea ice models for the Arctic Ocean, the parameterization of deformation processes was examined, based on the in-situ and satellite observations. Due to the limited availability of the Arctic project data and the difficulty in applying the algorithm of detecting deformed ice which was developed for the Okhotsk ice to the Arctic Ocean, the research design was modified to the investigation of the deformation processes for the Sea of Okhotsk as a typical seasonal ice zone. The results show that the sea ice rheology which has been adopted in many numerical sea ice models was justified to reproduce the real deformed ice to some extent, and suggest the self-similar properties of deformation in the wide range of horizontal scales, based on the measurements of size distribution of floes smatter than 10 m. These results are expected to be applied for the Arctic Ocean where the fraction of seasonal ice zone is increasing.
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| Free Research Field |
海氷科学
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| Academic Significance and Societal Importance of the Research Achievements |
現在の気候モデルでは北極海の海氷の急激な減少傾向がまだ的確には再現されておらず、モデルの改善が必要とされている。本研究は海氷の変形過程に焦点を当てて、北極海で実施された観測プロジェクトのデータ等を利用して変形氷域の時間発展の実態から変形過程のパラメタリゼーションの開発を志した。北極海データの利用が限られた現状に鑑み、対象海域をオホーツク海に変更して衛星や現場で取得した観測データに基づいて吟味した結果、従来のパラメタリゼーションの手法を適切に用いれば、変形氷の発達の様子を季節内および経年変動で捉えられることなどが示された。今後、季節海氷域化が進む北極海への適用が期待される。
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