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Mechanism of significant Antarctic ice sheet collapse events during the Last Interglacial

Research Project

Project/Area Number 17H01166
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Stratigraphy/Paleontology
Research InstitutionHokkaido University

Principal Investigator

Seki Osamu  北海道大学, 低温科学研究所, 准教授 (30374648)

Co-Investigator(Kenkyū-buntansha) 池原 実  高知大学, 教育研究部自然科学系理工学部門, 教授 (90335919)
堀川 恵司  富山大学, 学術研究部理学系, 准教授 (40467858)
山本 正伸  北海道大学, 地球環境科学研究院, 准教授 (60332475)
菅沼 悠介  国立極地研究所, 研究教育系, 准教授 (70431898)
Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥44,070,000 (Direct Cost: ¥33,900,000、Indirect Cost: ¥10,170,000)
Fiscal Year 2019: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2018: ¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2017: ¥13,780,000 (Direct Cost: ¥10,600,000、Indirect Cost: ¥3,180,000)
Keywords南極氷床 / ウィルクス海盆 / 最終間氷期 / 海水準 / 解水準 / 過去の温暖期 / 海面上昇
Outline of Final Research Achievements

During the Last Interglacial, when global mean temperatures were +1 degree C higher than pre-industrial levels, sea levels were estimated to have been +6-9 m higher than the present level. A better understanding of the dynamics of the Antarctic ice sheet during the Last Interglacial provides important insights for predicting sea-level changes in future warming scenarios. In this study, we reconstructed the ice sheet dynamics of the Wilkes Subglacial Basin Ice Sheet (WBIS) during the Last Interglacial based don analyses of neodymium isotope and beryllium in a marine sediment core (GC1407) collected near East Antarctica to reconstruct the dynamics of WBIS during the Last Interglacial. We found, for the first time, that significant WBIS retreat occurred not only in the early part of the Last Interglacial but also in the late stage of the Last Interglacial.

Academic Significance and Societal Importance of the Research Achievements

本研究は全球気温が現在(2021年)と同等であった最終間氷期(13-11.5万年前)に東南極のウイルクス海盆氷床がどの程度後退したのかを調べた結果、ウイルクス海盆氷床の著しい後退が2度ほど起こっていたことが明らかになった。このことは現在の気候状態(産業革命前よりも+1℃暖かい)が長時間継続した場合にやがてウイルクス海盆氷床の後退が起こる可能性を示唆する重要な成果である。

Report

(4 results)
  • 2020 Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (12 results)

All 2019 2018 2017 Other

All Int'l Joint Research (3 results) Journal Article (2 results) (of which Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Int'l Joint Research] インペリアルカレッジロンドン(英国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] ビクトリア大学・南極研究センター(ニュージーランド)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] インペリアル・カレッジ・ロンドン(英国)

    • Related Report
      2017 Annual Research Report
  • [Journal Article] Ocean circulation in the Southern Ocean driving global climate change : Agulhas leakage and Weddell gyre2018

    • Author(s)
      池原実
    • Journal Title

      低温科学

      Volume: 76 Pages: 121-134

    • DOI

      10.14943/lowtemsci.76.121

    • NAID

      120006466495

    • ISSN
      1880-7593
    • Year and Date
      2018-03-31
    • Related Report
      2017 Annual Research Report
    • Open Access
  • [Journal Article] Collapse of Antarctic ice sheet and sea level rise in the Last Interglacial2018

    • Author(s)
      関宰
    • Journal Title

      低温科学

      Volume: 76 Pages: 135-144

    • DOI

      10.14943/lowtemsci.76.135

    • NAID

      120006466496

    • ISSN
      1880-7593
    • Year and Date
      2018-03-31
    • Related Report
      2017 Annual Research Report
    • Open Access
  • [Presentation] Reconstructions of Antarctic ice sheet and ocean temperature variabilities in the late Pleistocene interglacials2019

    • Author(s)
      Iizuka, M., Seki, O., Horikawa, K., Yamamoto, M., Ikehara, M., Sugisaki, S., Itaki, T., Irino, T., Suganuma, Y.
    • Organizer
      International Conference on Paleoceanography
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 最終間氷期における東南極氷床変動の復元2019

    • Author(s)
      飯塚睦, 関宰,堀川恵司,山本正伸,池原実,杉崎彩子,板木拓也,入野智久,菅沼悠介,Matthieu Civel,Tina van de Flierdt,Liam Holder
    • Organizer
      第 5 回地球環境史学会年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 東南極域海底堆積物を用いた過去 15 万年間の南極氷床変動復元2019

    • Author(s)
      関宰,飯塚睦,堀川恵司,入野智久,池原実,山本正伸,Tina van de Flierdt,板木拓也,杉崎彩子,菅沼悠介
    • Organizer
      第 5 回地球環境史学会年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Reconstruction of Antarctic ice shelf variability in the Last Interglacial2019

    • Author(s)
      Iizuka M,Seki O,Horikawa K, Yamamoto M,Ikehara M,Sugisaki S, Itaki T,Irino T,Suganuma Y
    • Organizer
      The Second Zunoujunkan Workshop Cenozoic land-ocean linkages inAsia and the western Pacific and Indian Oceans
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Reconstruction of Antarctic Ice Sheet Variability during the Last Interglacial (MIS5e)2018

    • Author(s)
      Seki O, Yamamoto M, Ikehara M, Sugisaki S, Itaki T, Suganuma Y, Horikawa K
    • Organizer
      SCAR/IASC Open Science Conference
    • Related Report
      2018 Annual Research Report
  • [Presentation] 最終間氷期の突然かつ急激な南極氷床崩壊イベントの検証とメカニズムの解明に向けて2017

    • Author(s)
      関宰
    • Organizer
      日本地球惑星科学連合2017年大会
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] 南極氷床と気候の変動及び相互作用に関する研究展望2017

    • Author(s)
      川村 賢二、杉山 慎、植村 立、本山 秀明、澤柿 教伸、飯塚 芳徳、堀内 一穂、青木 周司、東 久美子、藤田 秀二、関 宰、平林 幹啓、大藪 幾美
    • Organizer
      日本地球惑星科学連合2017年大会
    • Related Report
      2017 Annual Research Report

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Published: 2017-04-28   Modified: 2022-03-29  

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