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Research on the onset and assessment of the new era of the Earth's environment dominated by human activities

Research Project

Project/Area Number 20K12135
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionOkayama University

Principal Investigator

Inoue Mayuri  岡山大学, 環境生命自然科学学域, 教授 (20451891)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsサンゴ骨格 / 海水温 / 塩分 / 温暖化 / 西太平洋 / 火山噴火 / 間接指標 / 酸性化 / 地球温暖化 / 海洋酸性化 / 東南アジア海域 / 人新世 / サンゴ
Outline of Research at the Start

現代の地球環境は人間が影響を与えるようになったと言われており、国際的にはそのような環境になった時代「Anthropocene(人新世)」を新たに設ける動きもある。地球温暖化はその代表例であるが、いつからこのような時代になったかは明白にされていない。本研究では東南アジア海域から採取されたサンゴ骨格試料を用いて、全球同時的な地球温暖化が開始した時期、および地球温暖化を含む全球規模の人間活動の局所的な海域への影響評価について研究を行う。

Outline of Final Research Achievements

By analyzing the chemical composition of coral skeletal core samples collected from the Philippine and Indonesian archipelagos, detailed reconstructions of variations in marine environments in each region were conducted. By examining oxygen isotope ratios and strontium-calcium ratios, salinity and sea water temperature were reconstructed. Evaluations were also conducted to assess the impact of anthropogenic carbon dioxide using carbon isotope ratios and uranium-calcium ratios. As a result, it was revealed that the Western Pacific region has been significantly affected by anthropogenic warming since 1976, with notable warming observed in the summer. On the other hand, the impact of warming in the Indonesian archipelago is more complex, with varying responses observed depending on the location within the archipelago.

Academic Significance and Societal Importance of the Research Achievements

この研究からも分かるように、現在では人為的要因による二酸化炭素放出に伴う温暖化が、自然の気候変動を圧倒し支配的になっている様子が伺えた。いかに人為起源による二酸化炭素放出を抑えることが本来の地球環境システムの安定化にとって重要であるかについて、科学的に発信できた点は社会的意義があると考える。また、熱帯から亜熱帯域においては、海水温と塩分の変動が一様ではなく、それぞれの支配要因が異なっており複雑であること、インドネシア多島海の複雑性を再認識するデータを提示できた点は学術的意義があると考える。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (4 results)

All 2023 2022 Other

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

  • [Int'l Joint Research] National Research and Innovation Agency(インドネシア)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Natural and Anthropogenic Climate Variability Signals in a 237‐Year‐Long Coral Record From the Philippines2023

    • Author(s)
      Inoue M.、Fukushima A.、Chihara M.、Genda A.、Ikehara M.、Okai T.、Kawahata H.、Siringan F. P.、Suzuki A.
    • Journal Title

      Paleoceanography and Paleoclimatology

      Volume: 38 Issue: 11 Pages: 1-21

    • DOI

      10.1029/2022pa004540

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Sea Surface Temperature and Salinity in Lombok Strait Reconstructed From Coral Sr/Ca and δ18O, 1962-2012.2022

    • Author(s)
      Genda A, Ikehara M, Suzuki A, Arman A and Inoue M
    • Journal Title

      Frontiers in Climate

      Volume: 4 Pages: 1-15

    • DOI

      10.3389/fclim.2022.918273

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Unique behavior of marine conditions in the Java Sea reconstructed from a 70 yr coral δ<sup>18</sup>O and Sr/Ca record from the Seribu Islands, Indonesia2022

    • Author(s)
      A. Genda, M. Ikehara, A. Suzuki, W. S. Hantoro, M. Inoue
    • Journal Title

      GEOCHEMICAL JOURNAL

      Volume: 56 Issue: 3 Pages: e1-e7

    • DOI

      10.2343/geochemj.GJ22007

    • ISSN
      0016-7002, 1880-5973
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research

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Published: 2020-04-28   Modified: 2025-01-30  

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