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Relationship between Tropical Pacific Ocean-Atmosphere Interaction and Northern Hemisphere Glaciation during the late Cenozoic

Research Project

Project/Area Number 18H01279
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 17020:Atmospheric and hydrospheric sciences-related
Research InstitutionKanazawa University

Principal Investigator

Sagawa Takuya  金沢大学, 地球社会基盤学系, 助教 (40448395)

Co-Investigator(Kenkyū-buntansha) 松崎 賢史  東京大学, 大気海洋研究所, 助教 (50728582)
山本 正伸  北海道大学, 地球環境科学研究院, 教授 (60332475)
久保田 好美  独立行政法人国立科学博物館, 地学研究部, 研究主幹 (80710946)
Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2019: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2018: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Keywords西部熱帯太平洋 / 鉛直水温構造 / 浮遊性有孔虫 / 鮮新世 / 更新世 / 大気海洋相互作用 / 熱帯太平洋域 / 国際深海科学掘削計画 / 水温復元 / 熱帯太平洋
Outline of Final Research Achievements

To investigate the relationship between changes in vertical temperature structure in the western tropical Pacific and global climate change, I analyzed planktonic foraminiferal shell geochemistry for three species picked from sediment core drilled in the International Ocean Discovery Program. The thickness of surface mixed layer was estimated by reconstructing vertical temperature structure from surface to subsurface for the last 4 Myr. The results suggested that the vertical temperature structure change has been associated with the meridional temperature gradient from tropics to polar region.

Academic Significance and Societal Importance of the Research Achievements

西部熱帯太平洋は全球で最も温暖な海水が存在し、大気に向けて熱や水蒸気を供給し大気循環を駆動する役割を果たしている。そのため、当該海域の水温や暖水塊厚さの時間的変化と全球気候の関係性を理解することが、地球気候システムの理解の一助になる。本研究で明らかになった熱帯-極域の温度勾配と西部熱帯太平洋の暖水塊厚さが連動していたことは、極域の温度変化にともなう南北温度勾配の変化が大気循環を通じて熱帯域の大気海洋相互作用に変化を与える可能性を示唆する。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (15 results)

All 2021 2019 2018 Other

All Int'l Joint Research (5 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 2 results) Remarks (1 results) Funded Workshop (1 results)

  • [Int'l Joint Research] Rutgers University/University of California, Santa Cruz(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University Collage of London(英国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] ラトガーズ大学(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] ラトガース大学(米国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] ブレーメン大学(ドイツ)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Tropical Western Pacific Hydrology During the Last 6,000?Years Based on Wildfire Charcoal Records From Borneo2021

    • Author(s)
      Yamamoto Masanobu、Kikuchi Takafumi、Sakurai Hiromichi、Hayashi Ryoma、Seki Osamu、Omori Takayuki、Sulaiman Abdullah、Shaari Hasrizal、Abdullah Mohd Zulhilmy、Melling Lulie
    • Journal Title

      Geophysical Research Letters

      Volume: 48 Issue: 18

    • DOI

      10.1029/2021gl093832

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A deep-sea agglutinated foraminifer tube constructed with planktonic foraminifer shells of a single species2018

    • Author(s)
      Paul N. Pearson, Takuya Sagawa, and IODP Expedition 363 Shipboard Scientific Party
    • Journal Title

      Journal of Micropalaeontology

      Volume: 37 Issue: 1 Pages: 97-104

    • DOI

      10.5194/jm-37-97-2018

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Western Pacific Warm Pool2018

    • Author(s)
      Rosenthal, Y., Holbourn, A.E., Kulhanek, D.K., Sagawa, T. and the Expedition 363 Scientists
    • Journal Title

      Proceedings of the International Ocean Discovery Program

      Volume: 363

    • DOI

      10.14379/iodp.proc.363.2018

    • Related Report
      2018 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Presentation] Evolution of meridional and zonal sea surface temperature gradients in the Pacific Ocean during the Quaternary period2021

    • Author(s)
      Takuya Sagawa, Risako Makino, Yukimi Kubota, Yoshimi Kubota, Yair Rosenthal
    • Organizer
      Japan Geoscience Union 2021 conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Pliocene thermocline stability in the western Pacific warm pool inferred from the individual foraminifera analysis2021

    • Author(s)
      Fumito Mizuno, Takuya Sagawa
    • Organizer
      Japan Geoscience Union 2021 conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Integrated stratigraphy of the sediment core retrieved from the Manihiki Plateau in the central Pacific and the paleotemperature change for the last 800 kyr2021

    • Author(s)
      Misaki Urakami, Takuya Sagawa, Yoshimi Kubota
    • Organizer
      Japan Geoscience Union 2021 conference
    • Related Report
      2021 Annual Research Report
  • [Presentation] 後期鮮新世以降の西太平洋暖水塊における表層・亜表層水温2019

    • Author(s)
      佐川拓也、久保田礼実、牧野梨沙子、久保田好美、Yair Rosenthal
    • Organizer
      地球環境史学会2019年年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 過去100万年間の西赤道太平洋暖水塊における鉛直水温構造の復元2019

    • Author(s)
      水野 文人、佐川 拓也、向田 圭祐、久保田 好美、山崎 俊嗣、黒田 潤一郎
    • Organizer
      地球惑星科学連合2019年大会
    • Related Report
      2018 Annual Research Report
  • [Remarks] プロジェクト紹介 IODP Expedition 363

    • URL

      http://earth.s.kanazawa-u.ac.jp/~tsagawa/project_Exp363.html

    • Related Report
      2018 Annual Research Report
  • [Funded Workshop] Kanazawa University SAKIGAKE International Symposium2021

    • Related Report
      2021 Annual Research Report

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Published: 2018-04-23   Modified: 2023-01-30  

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