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Development of ocean state estimations for the Antarctic coastal regions

Research Project

Project/Area Number 21K13989
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 17020:Atmospheric and hydrospheric sciences-related
Research InstitutionHokkaido University

Principal Investigator

NAKAYAMA Yoshihiro  北海道大学, 低温科学研究所, 助教 (30840201)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords南大洋 / 南極 / 海面上昇 / 棚氷 / データ同化 / 数値シミュレーション
Outline of Research at the Start

海水準変動予測で、最も不確かな要素が南極氷床である。南極沿岸域の海がの変動をコントロールすることがわかり、その理解が急務である。世界最先端の研究は、観測データは数が不十分で、モデルは過去の観測データの再現性が乏しいために、大きく前進できていない。研究代表者らは、棚氷融解が卓越しているアムンゼン海、トッテン氷河/棚氷沖の海洋領域モデルを開発してきた。モデルを安価/高速に駆動できるよう、研究的に重要で、観測データが南極沿岸域の中では多く存在する狭い領域に注目し、(a)綿密な観測とモデルの比較、(b)膨大な数の感度実験を可能にし、同化がうまくできていない理由を特定し、同化プロダクトを開発する。

Outline of Final Research Achievements

In our study of the West Antarctic, we developed ocean state estimates with explicit ice shelf cavity representations, using adjoint sensitivities. While these estimates matched observational data for the mean state, they didn't capture interannual variability accurately. For a better agreement with observations, we conducted high-resolution simulations, exploring subglacial freshwater discharge and ocean-current-bottom topography interaction. For the East Antarctic, we are optimizing models using Green's functions and adding biogeochemical components. This aims to create a comprehensive ice shelf-ocean-carbon coupled simulation, enhancing our understanding of climate interactions.

Our work, publishing 14 articles including high-impact journals (e.g., Nature Communications and Geophysical Research Letters), advances our understanding of ice shelf melting and Antarctic ice loss.

Academic Significance and Societal Importance of the Research Achievements

南極沿岸域の中で、最も南極の氷損失が卓越するアムンゼン海、観測データ/数値モデル研究ともにほとんど実施されてこなかった東南極沿岸トッテン氷河/棚氷沖ににおける研究を行った。棚氷融解を駆動する大気/海洋プロセスについて、新しい見方を示した研究も多く、学術的に意義があるものとなった。これらの知見は、全球モデルなどのより低解像度開発やそのためのパラメタリゼーション開発に役立てられる。長期間のシミュレーションである気候モデルにおける海洋循環や海水準といった全球環境将来予測スキルの発展に資する。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (35 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (7 results) Journal Article (15 results) (of which Int'l Joint Research: 12 results,  Peer Reviewed: 15 results,  Open Access: 13 results) Presentation (13 results) (of which Int'l Joint Research: 8 results)

  • [Int'l Joint Research] University of California Irvine/Dartmouth College/Scripps institute of oceanography(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Korean Polar Research Institute/Seoul National University,(韓国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] University of California Irvine/Dartmouth College/Scripps institute of oceanography(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] University of East Anglia/University of Edinburgh(英国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Tsinghua University/Sun Yat-sen University(中国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] University of California Irvine/NASA Jet Propulsion Laboratory/Dartmouth College(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Tsinghua University(中国)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Submesoscale Variability and Basal Melting in Ice Shelf Cavities of the Amundsen Sea2024

    • Author(s)
      Shrestha Kalyan、Manucharyan Georgy E.、Nakayama Yoshihiro
    • Journal Title

      Geophysical Research Letters

      Volume: 51 Issue: 3

    • DOI

      10.1029/2023gl107029

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Modeling Ocean Circulation and Ice Shelf Melt in the Bellingshausen Sea2024

    • Author(s)
      Hyogo Shuntaro, Nakayama Yoshihiro, Mensah Vigan
    • Journal Title

      Journal of Geophysical Research: Oceans

      Volume: 129 Issue: 3

    • DOI

      10.1029/2022jc019275

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] How Can Helicopters Help Us Determine the Health of Antarctica’s Oceans?2024

    • Author(s)
      Nakayama Yoshihiro、Wongpan Pat、Greenbaum Jamin S.、Yamazaki Kaihe、Aoki Shigeru
    • Journal Title

      Frontiers for Young Minds

      Volume: 12 Pages: 1080545-1080545

    • DOI

      10.3389/frym.2024.1080545

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Amundsen Sea Circulation Controls Bottom Upwelling and Antarctic Pine Island and Thwaites Ice Shelf Melting2024

    • Author(s)
      Taewook Park、Nakayama Yoshihiro、Nam SungHyun
    • Journal Title

      Nature Communications

      Volume: -

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] On-shelf circulation of warm water toward the Totten Ice Shelf in East Antarctica2023

    • Author(s)
      Hirano Daisuke、Tamura Takeshi、Kusahara Kazuya、Fujii Masakazu、Yamazaki Kaihe、Nakayama Yoshihiro、Ono Kazuya、Itaki Takuya、Aoyama Yuichi、Simizu Daisuke、Mizobata Kohei、Ohshima Kay I.、Nogi Yoshifumi、Rintoul Stephen R.、van Wijk Esmee、Greenbaum Jamin S.、Blankenship Donald D.、Saito Koji、Aoki Shigeru
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 4955-4955

    • DOI

      10.1038/s41467-023-39764-z

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Helicopter‐Based Ocean Observations Capture Broad Ocean Heat Intrusions Toward the Totten Ice Shelf2023

    • Author(s)
      Nakayama Yoshihiro、Wongpan Pat、Greenbaum Jamin S.、Yamazaki Kaihe、Noguchi Tomohide、Simizu Daisuke、Kashiwase Haruhiko、Blankenship Donald D.、Tamura Takeshi、Aoki Shigeru
    • Journal Title

      Geophysical Research Letters

      Volume: 50 Issue: 17

    • DOI

      10.1029/2022gl097864

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Ice‐Front Retreat Controls on Ocean Dynamics Under Larsen C Ice Shelf, Antarctica2023

    • Author(s)
      Poinelli M.、Nakayama Y.、Larour E.、Vizcaino M.、Riva R.
    • Journal Title

      Geophysical Research Letters

      Volume: 50 Issue: 18

    • DOI

      10.1029/2023gl104588

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Volume-Conserved Approach to Estimating Sea-Ice Production in Antarctic Polynyas2023

    • Author(s)
      Lin Yichen, Yang Qinghua, Shi Qing, Nakayama Yoshihiro, Chen Dake
    • Journal Title

      Geophysical Research Letters

      Volume: 50 Issue: 4

    • DOI

      10.1029/2022gl101859

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] What Determines the Shape of a Pine-Island-Like Ice Shelf?2022

    • Author(s)
      Nakayama Yoshihiro, Hirata Toshiki, Goldberg Daniel
    • Journal Title

      Geophysical Research Letters

      Volume: 49 Issue: 22

    • DOI

      10.1029/2022gl101272

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Interannual meltwater variability beneath Thwaites Ice Shelf, West Antarctica, driven by atmospheric forcing2022

    • Author(s)
      Dotto Tiago S., Heywood Karen J., Hall Rob A., Scambos Ted A., Zheng Yixi, Nakayama Yoshihiro, Hyogo Shuntaro, Snow Tasha, Wahlin Anna K, Wild Christian, Truffer Martin, Muto Atsushi, Pettit Erin
    • Journal Title

      Nature Communications

      Volume: 13 Issue: 1 Pages: 7840-7840

    • DOI

      10.1038/s41467-022-35499-5

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Development of adjoint-based ocean state estimation for the Amundsen and Bellingshausen seas and ice shelf cavities using MITgcm-ECCO (66j)2021

    • Author(s)
      Nakayama Yoshihiro、Menemenlis Dimitris、Wang Ou、Zhang Hong、Fenty Ian、Nguyen An T.
    • Journal Title

      Geoscientific Model Development

      Volume: 14 Issue: 8 Pages: 4909-4924

    • DOI

      10.5194/gmd-14-4909-2021

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Multidecadal poleward shift of the Southern Boundary of the Antarctic Circumpolar Current off East Antarctica2021

    • Author(s)
      Yamazaki, K., S. Aoki, K. Katsumata, D. Hirano, Y. Nakayama
    • Journal Title

      Science Advances

      Volume: 7 Issue: 24

    • DOI

      10.1126/sciadv.abf8755

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dense water downslope flow and AABW production in a numerical model: Sensitivity to horizontal and vertical resolution in the region off Cape Darnley polynya2021

    • Author(s)
      Mensah Vigan、Nakayama Yoshihiro、Fujii Masakazu、Nogi Yoshifumi、Ohshima Kay I.
    • Journal Title

      Ocean Modelling

      Volume: 165 Pages: 101843-101843

    • DOI

      10.1016/j.ocemod.2021.101843

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Antarctic Slope Current Modulates Ocean Heat Intrusions Towards Totten Glacier2021

    • Author(s)
      Nakayama Yoshihiro、Greene Chad A.、Paolo Fernando S.、Mensah Vigan、Zhang Hong、Kashiwase Haruhiko、Simizu Daisuke、Greenbaum Jamin S.、Blankenship Donald D.、Abe‐Ouchi Ayako、Aoki Shigeru
    • Journal Title

      Geophysical Research Letters

      Volume: 48 Issue: 17 Pages: 101843-101843

    • DOI

      10.1029/2021gl094149

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Impact of Subglacial Freshwater Discharge on Pine Island Ice Shelf2021

    • Author(s)
      Nakayama Yoshihiro、Cai Cilan、Seroussi Helene
    • Journal Title

      Geophysical Research Letters

      Volume: 48 Issue: 18

    • DOI

      10.1029/2021gl093923

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Understanding the Southern Ocean through model-data synthesis2024

    • Author(s)
      Yoshihiro Nakayama, Alena Malyarenko, Taewook Park, Tsubasa Yasui, Hong Zhang, Dimitris Menemenlis
    • Organizer
      Ocean Science Meeting 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Understanding southern ocean through model-data synthesis2023

    • Author(s)
      Yoshihiro Nakayama
    • Organizer
      Japan Geoscience Union Meeting 2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] Helicopter-based ocean observations capture broad ocean heat intrusions towards the Totten Ice Shelf2023

    • Author(s)
      Yoshihiro Nakayama
    • Organizer
      Forum for Research into Ice Shelf Processes (FRISP)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Optimization and evaluation of a high-resolution, regional, East-Antarctic ocean biogeochemistry model with novel in-situ physical and biogeochemical observations2023

    • Author(s)
      Yoshihiro Nakayama, Dustin Carroll, Pat Wongpan, Ryosuke Makabe, Shintaro Takao, Hong Zhang, Dimitris Menemenlis
    • Organizer
      The 28th IUGG General Assembly
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Understanding the Southern Ocean through model-data synthesis2023

    • Author(s)
      Yoshihiro Nakayama
    • Organizer
      SOOS Symposium 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 観測モデル融合研究から理解する南大洋/南極沿岸域2023

    • Author(s)
      Yoshihiro Nakayama
    • Organizer
      日本海洋学会2023年度秋季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Optimization and evaluation of a high-resolution, regional, East-Antarctic ocean biogeochemistry model with novel in-situ physical and biogeochemical observations2022

    • Author(s)
      Yoshihiro Nakayama, Dustin Carroll, Pat Wongpan, Ryosuke Makabe, Shintaro Takao, Hong Zhang, Dimitris Menemenlis
    • Organizer
      Ocean Science Meeting 2022, Online
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] What determines the ice shelf shape?2022

    • Author(s)
      Nakayama Yoshihiro, Hirata Toshiki, Goldberg Daniel
    • Organizer
      EGU General Assembly 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Understanding the Southern Ocean through model-data synthesis2022

    • Author(s)
      Nakayama Yoshihiro
    • Organizer
      日本海洋学会2021年度秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Helicopter-based ocean observations capture broad ocean heat intrusions towards the Totten2022

    • Author(s)
      Nakayama Yoshihiro, Greenbaum Jamin S., Wongpan Pat, Yamazaki Kaihei, Noguchi Tomohide, Simizu Daisuke, Kashiwase Haruhiko, Blankenship Donald D., Tamura Takeshi, Aoki Shigeru
    • Organizer
      AGU Fall Meeting 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Antarctic Slope Current controls warm ocean intrusions towards Totten Glacier2021

    • Author(s)
      Nakayama Yoshihiro、Greene Chad A.、Paolo Fernando S.、Mensah Vigan、Zhang Hong、Kashiwase Haruhiko、Simizu Daisuke、Greenbaum Jamin S.、Blankenship Donald D.、Abe‐Ouchi Ayako、Aoki Shigeru
    • Organizer
      EGU General Assembly 2021, Online
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] The development of East Antarctic ocean simulation with a focus on the Totten Glacier2021

    • Author(s)
      Nakayama Yoshihiro、Greene Chad A.、Paolo Fernando S.、Mensah Vigan、Zhang Hong、Kashiwase Haruhiko、Simizu Daisuke、Greenbaum Jamin S.、Blankenship Donald D.、Abe‐Ouchi Ayako、Aoki Shigeru
    • Organizer
      Japan Geoscience Union Meeting 2021, Online
    • Related Report
      2021 Research-status Report
  • [Presentation] 観測データの再現性の高い数値モデルの開発と 海洋-棚氷相互作用の研究2021

    • Author(s)
      Nakayama Yoshihiro
    • Organizer
      日本海洋学会2021年度秋季大会, オンライン開催
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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