2021 Fiscal Year Final Research Report
Reconstruction of the East Antarctic Ice Sheet thickness for the last 3 million years and mechanisms of their changes
Project/Area Number |
16H05739
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 海外学術 |
Research Field |
Geology
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Research Institution | National Institute of Polar Research |
Principal Investigator |
Suganuma Yusuke 国立極地研究所, 研究教育系, 准教授 (70431898)
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Co-Investigator(Kenkyū-buntansha) |
奥野 淳一 国立極地研究所, 研究教育系, 助教 (00376542)
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Project Period (FY) |
2016-04-01 – 2021-03-31
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Keywords | 東南極氷床 / 表面露出年代測定 / GIA / 周極深層水 / 海水準 |
Outline of Final Research Achievements |
The recent observations of the Antarctic ice sheet melt and its contribution to the sea-level rise are of great importance to human society. However, the mechanism of the Antarctic ice sheet melting is still largely unknown, which hampers future projections with higher precision. Here, we reconstruct long-term changes in the East Antarctic ice sheet based on field surveys and sample analysis aided by the Solid Earth model simulations, which allow a quantitative estimate of the ice sheet changes. Based on these analyses, the intensified warm current incision is thought to be a trigger of the significant Antarctic ice sheet melt in the past.
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Free Research Field |
地質学
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Academic Significance and Societal Importance of the Research Achievements |
現在観測されている南極氷床の融解傾向が,長期的に継続,もしくは加速し,大規模な氷床融解へと繋がるかについては,不明な点も残されており,現状の海水準上昇の将来予測には不確実性が大きい.本研究では,地形・地質記録から過去の長期的南極氷床の変動の復元に成功し,氷床融解メカニズムの一部を明らかにした.この成果は,将来予測モデルの再現性確認や改良を通して,海水準上昇を含む将来予測の高精度化に資するものとなる.
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