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Hybrid ocean observation: Circulation variation in the Kuroshio Extension area and its influence on atmosphere and biogeochemistry

Planned Research

Project AreaMid-latitude ocean-atmosphere interaction hotspots under the changing climate
Project/Area Number 19H05700
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionThe University of Tokyo

Principal Investigator

岡 英太郎  東京大学, 大気海洋研究所, 准教授 (60360749)

Co-Investigator(Kenkyū-buntansha) 川合 義美  国立研究開発法人海洋研究開発機構, 地球環境部門(海洋観測研究センター), グループリーダー代理 (40374897)
細田 滋毅  国立研究開発法人海洋研究開発機構, 地球環境部門(海洋観測研究センター), グループリーダー (60399582)
須賀 利雄  東北大学, 理学研究科, 教授 (70211977)
小橋 史明  東京海洋大学, 学術研究院, 教授 (80377077)
遠山 勝也  気象庁気象研究所, 気候・環境研究部, 主任研究官 (80772483)
Project Period (FY) 2019-06-28 – 2024-03-31
Project Status Granted (Fiscal Year 2023)
Budget Amount *help
¥212,290,000 (Direct Cost: ¥163,300,000、Indirect Cost: ¥48,990,000)
Fiscal Year 2023: ¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2022: ¥19,240,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥4,440,000)
Fiscal Year 2021: ¥27,300,000 (Direct Cost: ¥21,000,000、Indirect Cost: ¥6,300,000)
Fiscal Year 2020: ¥32,240,000 (Direct Cost: ¥24,800,000、Indirect Cost: ¥7,440,000)
Fiscal Year 2019: ¥117,520,000 (Direct Cost: ¥90,400,000、Indirect Cost: ¥27,120,000)
Keywords黒潮続流域 / モード水 / 大気海洋相互作用 / 生物地球化学 / 海洋観測 / 亜熱帯モード水 / 黒潮・黒潮続流 / ハイブリッド観測
Outline of Research at the Start

日本の南~南東を流れる黒潮・黒潮続流の周辺海域では、冬季に深い鉛直対流が起こり、春以降大量の水が、水温・塩分などの気候変動シグナルや二酸化炭素などの物質とともに、海洋の表面から内部へと沈み込む。この沈み込んだ水「亜熱帯モード水」がその後どのように移動・変質し、さらにはどのように海面に再出現し、そこでの大気や化学生物環境にどのような影響を与えるのかを、自働観測ロボットや船舶を使った物理・化学観測により解明する。

Outline of Annual Research Achievements

亜熱帯モード水(STMW)分布域に2年間にわたり展開する酸素・pHセンサー付プロファイリング・フロート13台を、2020年4~5月に白鳳丸航海と気象庁の3航海を使って投入するべく準備を進めていたが、COVID-19の流行拡大のため全ての航海が中止となった。白鳳丸の共同利用航海は2021年2月に復活が認められ、2021年2、4、6月の気象庁の3航海と合わせてフロートを投入する計画を作り直したが、観測に1年の遅れが生じることとなった。
2021年2月に、気象庁啓風丸KS21-02航海で4台、白鳳丸KH-21-1航海で5台のフロートを投入するとともに、フロートセンサー検定のための採水測定を行った。白鳳丸航海では、2021年晩冬に形成中のSTMWの詳細な断面観測を合わせて行った。投入したフロート9台は順調に稼働し、それぞれ2週間程度、1日毎のテスト観測を行ったのち、5日毎の通常観測に切り替えた。今後、投入時の採水データを用いて、得られる水温・塩分・溶存酸素・pHデータの補正を進める。
これらの観測および観測準備と並行して、既存のデータを用いた研究を進めた。Oka et al. (submitted)はアルゴデータの解析から、16~19.5℃の低渦位層として特徴づけられるSTMWの80%以上は黒潮続流の南で形成される16~18℃の比較的冷たいものであること、2017年夏に始まった黒潮大蛇行により16~18℃のSTMWの日本の南への西向き移流が大きく減少していることなどを明らかにした。Nishikawa et al. (in prep.)は、今回の黒潮大蛇行に伴う四国沖再循環の中でのSTMWの時間発展の様子を示した。Hosoda et al. (2021)は、本領域第1期で2014年2~6月に実施したグライダー観測のデータから、サブメソスケールの水塊変動を明らかにした。

Current Status of Research Progress
Current Status of Research Progress

3: Progress in research has been slightly delayed.

Reason

COVID-19の流行拡大のために観測航海が全て中止となり、2020年度頭に予定していたフロートの投入・展開が1年程度遅れることとなったため。

Strategy for Future Research Activity

既存のアルゴデータなどを用いた研究を推進するとともに、1年遅れで投入したフロートから得られたデータの品質管理、ならびにデータを用いた研究を速やかに進められるよう、班の中での連携を一層強化する。

Report

(2 results)
  • 2020 Annual Research Report
  • 2019 Annual Research Report

Research Products

(44 results)

All 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (16 results) (of which Int'l Joint Research: 9 results,  Peer Reviewed: 14 results,  Open Access: 11 results) Presentation (26 results) (of which Int'l Joint Research: 14 results,  Invited: 2 results)

  • [Int'l Joint Research] ハワイ大学(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] ハワイ大学(米国)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] 黒潮と気象・気候2021

    • Author(s)
      小橋史明
    • Journal Title

      海と安全(日本海難防止協会情報誌)

      Volume: 56 Pages: 5-8

    • Related Report
      2020 Annual Research Report
    • Open Access
  • [Journal Article] Rapid water parcel transport across the Kuroshio Extension in the lower thermocline from dissolved oxygen measurements by Seaglider2021

    • Author(s)
      Hosoda Shigeki、Inoue Ryuichiro、Nonaka Masami、Sasaki Hideharu、Sasai Yoshikazu、Hirano Mizue
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 8 Issue: 1 Pages: 1-19

    • DOI

      10.1186/s40645-021-00406-x

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nanomolar phosphate supply and its recycling drive net community production in the subtropical North Pacific2021

    • Author(s)
      Hashihama Fuminori、Yasuda Ichiro、Kumabe Aki、Sato Mitsuhide、Sasaoka Hiroshi、Iida Yosuke、Shiozaki Takuhei、Saito Hiroaki、Kanda Jota、Furuya Ken、Boyd Philip W.、Ishii Masao
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 3462-3462

    • DOI

      10.1038/s41467-021-23837-y

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Formation of Central Mode Water based on two zonal hydrographic sections in spring 2013 and 20162020

    • Author(s)
      Oka, E., S. Kouketsu, D. Yanagimoto, D. Ito, Y. Kawai, S. Sugimoto, and B. Qiu
    • Journal Title

      Journal of Oceanography

      Volume: 76 Issue: 5 Pages: 373-388

    • DOI

      10.1007/s10872-020-00551-9

    • NAID

      40022348695

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Twenty-first century ocean warming, acidification, deoxygenation, and upper-ocean nutrient and primary production decline from CMIP6 model projections2020

    • Author(s)
      Kwiatkowski, L., O. Torres, ..., K. Toyama (23番目), .., T. Ziehn
    • Journal Title

      Biogeosciences

      Volume: 17 Issue: 13 Pages: 3439-3470

    • DOI

      10.5194/bg-17-3439-2020

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Ocean Acidification From Below in the Tropical Pacific2020

    • Author(s)
      Ishii Masao、Rodgers Keith B.、Inoue Hisayuki Y.、Toyama Katsuya、Sasano Daisuke、Kosugi Naohiro、Ono Hisashi、Enyo Kazutaka、Nakano Toshiya、Iudicone Daniele、Blanke Bruno、Aumont Olivier、Feely Richard A.
    • Journal Title

      Global Biogeochemical Cycles

      Volume: 34 Issue: 8

    • DOI

      10.1029/2019gb006368

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Reemergence of Anthropogenic Carbon Into the Ocean's Mixed Layer Strongly Amplifies Transient Climate Sensitivity2020

    • Author(s)
      Rodgers K. B.、Schlunegger S.、Slater R. D.、Ishii M.、Frolicher T. L.、Toyama K.、Plancherel Y.、Aumont O.、Fassbender A. J.
    • Journal Title

      Geophysical Research Letters

      Volume: 47 Issue: 18

    • DOI

      10.1029/2020gl089275

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Severe Cold Winter in North America Linked to Bering Sea Ice Loss2020

    • Author(s)
      Iida Mizuki、Sugimoto Shusaku、Suga Toshio
    • Journal Title

      Journal of Climate

      Volume: 33 Issue: 18 Pages: 8069-8085

    • DOI

      10.1175/jcli-d-19-0994.1

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Coupling of Surface Ocean Heat and Carbon Perturbations over the Subtropical Cells under Twenty-First Century Climate Change2020

    • Author(s)
      Rodgers K. B.、Ishii M.、Frolicher T. L.、Schlunegger S.、Aumont O.、Toyama K.、Slater R. D.
    • Journal Title

      Journal of Climate

      Volume: 33 Issue: 23 Pages: 10321-10338

    • DOI

      10.1175/jcli-d-19-1022.1

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] On the Reset of the Wind-Forced Decadal Kuroshio Extension Variability in Late 20172020

    • Author(s)
      Qiu Bo、Chen Shuiming、Schneider Niklas、Oka Eitarou、Sugimoto Shusaku
    • Journal Title

      Journal of Climate

      Volume: 33 Issue: 24 Pages: 10813-10828

    • DOI

      10.1175/jcli-d-20-0237.1

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 大気海洋相互作用と黒潮・黒潮続流域観測2020

    • Author(s)
      川合義美
    • Journal Title

      月刊海洋 特集号 ー今後の黒潮と周辺海域の国際共同観測を考えるー

      Volume: 52 Pages: 295-299

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Heat and salinity transport between the permanent pycnocline and the mixed layer due to the obduction process evaluated from a gridded Argo dataset2020

    • Author(s)
      Kawai Yoshimi、Hosoda Shigeki、Uehara Kazuyuki、Suga Toshio
    • Journal Title

      Journal of Oceanography

      Volume: 77 Issue: 1 Pages: 75-92

    • DOI

      10.1007/s10872-020-00559-1

    • NAID

      40022471981

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Rapid freshening of Japan Sea Intermediate Water in the 2010s2020

    • Author(s)
      Kosugi Naohiro、Hirose Nariaki、Toyoda Takahiro、Ishii Masao
    • Journal Title

      Journal of Oceanography

      Volume: 77 Issue: 2 Pages: 269-281

    • DOI

      10.1007/s10872-020-00570-6

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spatial Distribution and Seasonality of Halocline Structures in the Subarctic North Pacific2020

    • Author(s)
      Katsura, S., H. Ueno, H. Mitsudera, S. Kouketsu
    • Journal Title

      Journal of Physical Oceanography

      Volume: 50 Issue: 1 Pages: 95-109

    • DOI

      10.1175/jpo-d-19-0133.1

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Seasonality and Formation of Barrier Layers and Associated Temperature Inversions in the Eastern Tropical North Pacific2020

    • Author(s)
      Katsura, S. and J. Sprintall
    • Journal Title

      Journal of Physical Oceanography

      Volume: 50 Issue: 3 Pages: 791-808

    • DOI

      10.1175/jpo-d-19-0194.1

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Acceleration of Ocean Acidification in the Western North Pacific2019

    • Author(s)
      Ono, H., N. Kosugi, K. Toyama, H. Tsujino, A. Kojima, K. Enyo, Y. Iida, T. Nakano, and M. Ishii
    • Journal Title

      Geophysical Research Letters

      Volume: 46 Issue: 22 Pages: 13161-13169

    • DOI

      10.1029/2019gl085121

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] 東経165度線における表面海水中全炭酸濃度の変動と東経137度線との比較2020

    • Author(s)
      小野恒・石井雅男・谷崎知穂・飯田洋介・延与和敬・笹野大輔
    • Organizer
      JpGU-AGU Joint Meeting 2020: Virtual
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Small water mass transport across the Kuroshio Extension region in the thermocline by Seaglider and BGC Argo floats: Hints of integrated ocean observations2020

    • Author(s)
      Hosoda, S., R. Inoue, M. Nonaka, H. Sasaki, Y. Sasai, M. Hirano
    • Organizer
      JpGU-AGU Joint Meeting 2020: Virtual
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Changes of the obduction and subduction rates accompanied by anomalous winters2020

    • Author(s)
      Kawai, Y., K. Uehara, and S. Hosoda
    • Organizer
      JpGU-AGU Joint Meeting 2020: Virtual
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 全球海洋観測システムの発展と今後2020

    • Author(s)
      岡英太郎
    • Organizer
      JpGU-AGU Joint Meeting 2020: Virtual
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Halocline Structures in the Subarctic North Pacific Detected by Argo Data2020

    • Author(s)
      Katsura, S., H. Ueno, H. Mitsudera, and S. Kouketsu
    • Organizer
      JpGU-AGU Joint Meeting 2020: Virtual
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Salt-Stratified Barrier Layers in the Eastern Tropical North Pacific2020

    • Author(s)
      Katsura, S. and J. Sprintall
    • Organizer
      JpGU-AGU Joint Meeting 2020: Virtual
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 西部北太平洋亜寒帯域における表面海水中全炭酸濃度の増加傾向2020

    • Author(s)
      小野恒・石井雅男・飯田洋介・延与和敬・笹野大輔
    • Organizer
      日本海洋学会2020年度秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] アルゴデータに基づくインド洋亜熱帯モード水の季節・経年変動2020

    • Author(s)
      Adiwira, H. and T. Suga
    • Organizer
      日本海洋学会2020年度秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 教師なしクラスタリングによって同定される中緯度北西太平洋における海洋構造の境界2020

    • Author(s)
      三部文香・須賀利雄
    • Organizer
      日本海洋学会2020年度秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Salinity and thickness anomalies and their propagation in the upper North Pacific2020

    • Author(s)
      王童・須賀利雄・纐纈慎也
    • Organizer
      日本海洋学会2020年度秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] アルゴフロートで観測された北太平洋における深度2000m付近の短期変動2020

    • Author(s)
      川合義美
    • Organizer
      日本海洋学会2020年度秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 北太平洋亜熱帯モード水の十年規模変動が密度躍層に与える影響について2020

    • Author(s)
      小橋史明・中野俊也・岩坂直人・尾形友道
    • Organizer
      日本海洋学会2020年度秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 北太平洋亜熱帯モード水形成域における冬季海面水温偏差の再出現について2020

    • Author(s)
      秋元七海・小橋史明・岩坂直人
    • Organizer
      日本海洋学会2020年度秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 黒潮大蛇行と北太平洋亜熱帯モード水2020

    • Author(s)
      西川はつみ・岡英太郎
    • Organizer
      東京大学大気海洋研究所国際沿岸海洋研究センター共同利用研究集会「黒潮/親潮続流域の力学過程とその学際的応用」
    • Related Report
      2020 Annual Research Report
  • [Presentation] Water mass exchange across the Kuroshio Extension region in the main thermocline detected by Seaglider2020

    • Author(s)
      Hosoda, S., R. Inoue, M. Nonaka, H. Sasaki, Y. Sasai, M. Hirano
    • Organizer
      2020 AGU Fall meeting
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Glider observation of an eastward moving anticyclonic eddy in the western North Pacific2020

    • Author(s)
      Toyama, K., H. Ono, N. Kosugi, H. Tsujino and M. Ishii
    • Organizer
      Ocean Sciences Meeting 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Rapid water parcel transport across the Kuroshio Extension in the lower thermocline from dissolved oxygen measurements by Seaglider and BGC Argo floats2020

    • Author(s)
      Hosoda, S., R. Inoue, M. Nonaka, H. Sasaki, Y. Sasai, M. Hirano
    • Organizer
      Ocean Sciences Meeting 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Heat and salinity transport between the mixed layer and the permanent pycnocline estimated from Argo data2020

    • Author(s)
      Kawai, Y.
    • Organizer
      Ocean Sciences Meeting 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Barrier Layers and Temperature Inversions form at Sea Surface Salinity fronts in the Eastern Tropical Pacific Fresh Pool2020

    • Author(s)
      Katsura, S. and J. Sprintall
    • Organizer
      Ocean Sciences Meeting 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Method to evaluate the effect of obduction on properties in the ocean mixed layer2019

    • Author(s)
      Kawai, Y.
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 2018年7月豪雨時の週間アンサンブル予報データによる簡易感度解析2019

    • Author(s)
      川合義美
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 水中グライダーによる東向きに移動する渦の直接観測2019

    • Author(s)
      遠山勝也・小野恒・小杉如央・辻野博之・石井雅男
    • Organizer
      日本海洋学会2019年度秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] オイラー的手法によるオブダクション・サブダクション率の算出と海洋混合層への影響の評価2019

    • Author(s)
      川合義美
    • Organizer
      日本海洋学会2019年度秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 遠隔強制による過去40年間の亜熱帯モード水の物理・生物地球化学的十年規模変動2019

    • Author(s)
      岡英太郎・山田広大・笹野大輔・延与和敬・中野俊也・石井雅男
    • Organizer
      日本海洋学会2019年度秋季大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Long-term change and decadal variability in physical and biogeochemical properties of the North Pacific Subtropical Mode Water revealed by 50-year long shipboard observations along 137E2019

    • Author(s)
      Oka, E. and T. Nakano
    • Organizer
      Ocean Obs ‘19
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Structure and Variability of Surface Layer Salinity in the Subtropical North Pacific Detected by Argo Data2019

    • Author(s)
      Katsura, S.
    • Organizer
      Ocean Obs ‘19
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research

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Published: 2019-07-04   Modified: 2023-07-19  

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