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Elucidation of the formation mechanisms of the large standing oceanic eddy and the factors controlling eddy circulation contributing to warm water transport to the Totten Ice Shelf in East Antarctica

Research Project

Project/Area Number 23K21745
Project/Area Number (Other) 21H03587 (2021-2023)
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeMulti-year Fund (2024)
Single-year Grants (2021-2023)
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionTokyo University of Marine Science and Technology

Principal Investigator

溝端 浩平  東京海洋大学, 学術研究院, 准教授 (80586058)

Co-Investigator(Kenkyū-buntansha) 草原 和弥  国立研究開発法人海洋研究開発機構, 地球環境部門(環境変動予測研究センター), 研究員 (20707020)
平野 大輔  国立極地研究所, 南極観測センター, 助教 (30790977)
Project Period (FY) 2021-04-01 – 2025-03-31
Project Status Granted (Fiscal Year 2024)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2024: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2023: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2022: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2021: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
Keywords南極海 / 衛星高度計 / トッテン棚氷 / 周極深層水 / 棚氷底面融解 / 定在海洋渦 / 熱輸送量
Outline of Research at the Start

東南極大陸棚へと熱を輸送する巨大定在海洋渦の成因と循環流量の維持強化メカニズムを明らかにする。海洋渦は軽度方向に列をなして存在し、効率的に海洋熱を南極大陸棚へと輸送している。元来、海盆域に存在する海洋熱がこれらの海洋渦によってどの程度大陸棚へと輸送されているのか、そのメカニズムを調べ、海洋自体が持つ棚氷融解に対する役割を明らかにする。このメカニズムの理解は将来の海面水位上昇予測にも貢献する。

Outline of Annual Research Achievements

今年度も砕氷艦「しらせ」および練習船「海鷹丸」を用いて,アイスフロントを含むトッテン氷河周辺海域,オーストラリアー南極海盆における海洋観測を実施した。しらせ観測では,暖水循環域である大陸棚斜面域からトッテン棚氷アイスフロントまでの水温塩分観測および海底地形観測を実施した。また係留系の回収・再設置を行った。一方,海鷹丸観測では,氷山帯に阻まれたため、当初予定していた東経116から120Eまでの東西断面観測をキャンセルし、東経120E以東の東サブリナ渦および、新規衛星プロダクトで見えてきた東サブリナ渦の南西側にある循環に焦点を当てた水理観測(水温,塩分,絶対流速)を実施した。なおポインセット渦中心係留系回収も行った。海鷹丸の断面観測により,東サブリナ渦など衛星プロダクトで示される時計回り循環の存在を確認できた。これまでの結果から、今回存在を確認した時計回り渦(東サブリナ渦など)とAntarctic Slope Current、Sabrina Depression上の時計回り循環、これらがカップリングすることによる海盆からトッテン棚氷までの海洋熱輸送が主にトッテン棚氷の底面融解をもたらしていると推察できた。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

しらせおよび海鷹丸により予定通りの観測を実施できた。新規の衛星データセットから大陸棚・大陸棚斜面における新たな海洋循環を見出し,現場観測・数値モデリングの結果からも裏付けられた。また,これまでの観測結果に基づいた研究成果がNature Communicationsなどに研究成果を公表した。

Strategy for Future Research Activity

定在海洋渦,大陸棚域の時計回り循環の実態を解明するため引き続き海洋観測を実施する。係留系データ・水理観測データ・衛星観測データの解析を行い、水温・塩分・流速・溶存酸素濃度の時系列データを吟味することで,水塊変質,循環流量の時間変動とその要因の解明に注力する。定在海洋渦の成因や循環流量変動については,新たに得られた観測データに基づいた数値シミュレーションによる感度解析からも調査する。
また2023年に海氷が激減し、南極海海氷・南極氷床変動に関しては、側面融解も無視できない新たなフェーズに入ったと考えられる。そのため、表層混合層内貯熱量についても衛星観測データ、気象再解析データなどを用いて多角的に調査する。

Report

(3 results)
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (16 results)

All 2023 2022 2021 Other

All Journal Article (6 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 6 results,  Open Access: 6 results) Presentation (8 results) (of which Int'l Joint Research: 8 results) Remarks (2 results)

  • [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] Modeling seasonal-to-decadal ocean-cryosphere interactions along the Sabrina Coast, East Antarctica2023

    • Author(s)
      Kusahara Kazuya、Hirano Daisuke、Fujii Masakazu、Fraser Alexander、Tamura Takeshi、Mizobata Kohei、Williams Guy、Aoki Shigeru
    • Journal Title

      The Cryosphere

      Volume: -

    • DOI

      10.5194/tc-2023-78

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Diffusion of Circumpolar Deep Water Towards Antarctica2023

    • Author(s)
      Yamazaki Kaihe、Aoki Shigeru、Mizobata Kohei
    • Journal Title

      Journal of Geophysical Research: Oceans

      Volume: 128 Issue: 2 Pages: 2-2

    • DOI

      10.1029/2022jc019422

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Shoaling of abyssal ventilation in the Eastern Indian Sector of the Southern Ocean2022

    • Author(s)
      Shimada Keishi、Kitade Yujiro、Aoki Shigeru、Mizobata Kohei、Cheng Lingqiao、Takahashi Kunio T.、Makabe Ryosuke、Kanda Jota、Odate Tsuneo
    • Journal Title

      Communications Earth & Environment

      Volume: 3 Issue: 1 Pages: 120-120

    • DOI

      10.1038/s43247-022-00445-2

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Modeling the egg and larval transport pathways of the Antarctic toothfish ( <scp> <i>Dissostichus mawsoni</i> </scp> ) in the East Antarctic region: New insights into successful transport connections2021

    • Author(s)
      Mori Mao、Mizobata Kohei、Ichii Taro、Ziegler Philippe、Okuda Takehiro
    • Journal Title

      Fisheries Oceanography

      Volume: 31 Issue: 1 Pages: 19-39

    • DOI

      10.1111/fog.12560

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Poleward eddy-induced warm water transport across a shelf break off Totten Ice Shelf, East Antarctica2021

    • Author(s)
      Hirano Daisuke、Mizobata Kohei、Sasaki Hiroko、Murase Hiroto、Tamura Takeshi、Aoki Shigeru
    • Journal Title

      Communications Earth & Environment

      Volume: 2 Issue: 1 Pages: 1-8

    • DOI

      10.1038/s43247-021-00217-4

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Phytoplankton response to the Southern annular mode and El Nino-Southern Oscillation in the Southern Ocean2023

    • Author(s)
      Kohei Mizobata, Moe Fujita
    • Organizer
      Japan Geoscience Union Meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Assessing the Secular Variability of Turbulent Mixing in the Australia-Antarctic Basin of Southern Ocean2023

    • Author(s)
      Kitade Yujiro, Naho Kamogawa, Keishi Shimada, Kouhei Mizobata, Toshiyuki Hibiya
    • Organizer
      Japan Geoscience Union Meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Modeling ocean-cryosphere interactions along the Sabrina Coast2023

    • Author(s)
      Kazuya Kusahara, Daisuke Hirano, Masakazu Fujii, Alexander D. Fraser, Takeshi Tamura, Kohei Mizobata, Guy D. Williams, Shigeru Aoki
    • Organizer
      Japan Geoscience Union Meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Poleward transport of mCDW mediated by standing eddies in Southern Ocean Indian Sector2023

    • Author(s)
      Kohei Mizobata
    • Organizer
      Southern Ocean Observing System (SOOS) Symposium 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Horizontal diffusion due to medium-scale eddies in Meridional Ocean Circulation of Southern Ocean2022

    • Author(s)
      Kitade Yujiro, Kohei Mizobata, Keishi Shimada, Shigeru Aoki, Hiroshi Uchida
    • Organizer
      Japan Geoscience Union 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Relationship between Southern Annular Mode and poleward ocean heat transport toward East Antarctic ice shelf2022

    • Author(s)
      Kohei Mizobata, Shintaro Takao, Daisuke Hirano, Jun Inoue, Shigeru Aoki, Ryosuke Makabe
    • Organizer
      Japan Geoscience Union 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] On-Shelf Circulation of Warm Water Toward the Totten Ice Shelf, East Antarctica2022

    • Author(s)
      Daisuke Hirano, Takeshi Tamura, Kazuya Kusahara, Masakazu Fujii, Kaihe Yamazaki, Yoshihiro Nakayama, Kazuya Ono, Takuya Itaki, Yuichi Aoyama, Daisuke Simizu, Kohei Mizobata, Kay I. Ohshima, Yoshifumi Nogi, Stephen R. Rintoul, Esmee van Wijk, Jamin S. Greenbaum, Donald D. Blankenship, Shigeru Aoki
    • Organizer
      Japan Geoscience Union 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ocean circulation in the shelf-slope region of East Antarctica as suggested by satellite radar altimetry2021

    • Author(s)
      Kohei Mizobata and Mao Mori
    • Organizer
      Japan Geoscience Union Meeting, online, 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Remarks] Researchmap: 溝端浩平

    • URL

      https://researchmap.jp/mizobatakohei

    • Related Report
      2021 Annual Research Report
  • [Remarks] 東京海洋大学 溝端浩平

    • URL

      https://www2.kaiyodai.ac.jp/~mizobata/

    • Related Report
      2021 Annual Research Report

URL: 

Published: 2021-04-28   Modified: 2024-12-25  

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