• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Examinaiton of weathering feedbacks to climate change and glacial erosion

Research Project

Project/Area Number 21H01204
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 17050:Biogeosciences-related
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

Yoshimura Toshihiro  国立研究開発法人海洋研究開発機構, 海洋機能利用部門(生物地球化学センター), 副主任研究員 (90710070)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2023: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2022: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2021: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Keywords氷河作用 / 化学風化 / 削剥 / 気候 / 氷期・間氷期 / 風化 / 氷河 / 堆積物 / 気候変動 / 二酸化炭素 / ケイ酸塩 / 氷床 / 氷期間氷期 / 侵食
Outline of Research at the Start

地質学的な時間スケールにおいて地球表層の炭素動態を規定する第一級の制御因子の一つにケイ酸塩岩の化学風化が挙げられる。氷河によって生産される極めて反応性の高い細粒ケイ酸塩鉱物の溶解反応がCO2の消費に寄与し,これが寒冷化を促進した可能性があるが,地質イベントとの関連性に対して直接的な証拠に乏しい。本研究では海洋堆積物試料に含まれる陸源物質のリチウム同位体比を測定し岩石の風化量を復元することで,気候変動と氷床形成に対するケイ酸塩風化の変化を定量化することで,氷床量の増減と気候変動に対する岩石の分解反応がもつフィードバック効果を解明する。

Outline of Final Research Achievements

Atmospheric CO2 has received increasing public attention as a factor determining climate. Recently, it has been proposed that dissolution reactions of reactive fine-grained silicate minerals produced by glaciers contributed to CO2 consumption, which may have promoted colder temperatures. However, there is a lack of direct evidence for a link with geological events. In this study, we reconstruct changes in silicate weathering intensity in response to climate change and ice sheet formation from chemical indices (element ratios and lithium isotope ratios) of sediment samples from New Zealand and the Antarctic Ocean, where materials produced by glacial ablation were deposited. The results indicate that fresher material was supplied in the past million years and that chemical weathering was enhanced in ice sheet formation.

Academic Significance and Societal Importance of the Research Achievements

ケイ酸塩岩の化学風化によって生産された溶質が海洋に運搬されると,海洋生物の石灰化反応によって炭素が海底に固定されることで効率的な二酸化炭素の除去に寄与することが予想されるが,氷河により新鮮な物質の供給が促進されることで,より風化反応の強度が増加したことを確認した。地球上の気候レジームを左右する炭素動態の長期変動の理解に寄与する成果である。

Report

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

    (26 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (3 results) Journal Article (12 results) (of which Int'l Joint Research: 10 results,  Peer Reviewed: 12 results,  Open Access: 3 results) Presentation (11 results) (of which Int'l Joint Research: 6 results)

  • [Int'l Joint Research] University of North Carolina(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Seoul National University(韓国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] British Columbia Geological Survey(カナダ)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Historical trend of polycyclic aromatic hydrocarbons in a sediment core from Osaka Bay during the Meghalayan2024

    • Author(s)
      Nitzsche Kai Nils、Ishikawa Naoto F、Yoshimura Toshihiro、Kajita Hiroto、Kawahata Hodaka、Ogawa Nanako O、Suga Hisami、Ohkouchi Naohiko
    • Journal Title

      The Holocene

      Volume: - Issue: 7 Pages: 0-0

    • DOI

      10.1177/09596836241236320

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Chemical evolution of primordial salts and organic sulfur molecules in the asteroid 162173 Ryugu2023

    • Author(s)
      Yoshimura, Toshihiro; Takano, Yoshinori; Naraoka, Hiroshi and 84 more (Yabuta, H.は26番目)
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 5284-5284

    • DOI

      10.1038/s41467-023-40871-0

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Mn?carbonate deposition in a seafloor hydrothermal system (CLAM field, Iheya Ridge, Okinawa Trough): Insights from mineralogy, geochemistry and isotope studies2023

    • Author(s)
      Dekov V.M.、Yasuda K.、Kamenov G.、Yasukawa K.、Gu?guen B.、Kano A.、Yoshimura T.、Yamanaka T.、Bindi L.、Okumura T.、Asael D.、Araoka D.、Kato Y.
    • Journal Title

      Marine Geology

      Volume: 460 Pages: 107055-107055

    • DOI

      10.1016/j.margeo.2023.107055

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Carbonate Associated Sulfate Extraction Method Using Weakly Acidic Cation Exchange Resins2023

    • Author(s)
      Kochi Takeru、Yoshimura Toshihiro、Ogawa Nanako O.、Ohkouchi Naohiko、Kobayashi Yasuyuki、Kuroda Junichiro
    • Journal Title

      Geostandards and Geoanalytical Research

      Volume: 48 Issue: 1 Pages: 77-89

    • DOI

      10.1111/ggr.12536

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Lithium isotope systematics of methane-seep carbonates as an archive of fluid origins and flow rates2023

    • Author(s)
      Miyajima, Y., Araoka, D., Yoshimura, T., Ota, Y., Suzuki, A., Yoshioka, H., Suzumura, M., Smrzka, D., Peckmann, J. and Bohrmann, G.
    • Journal Title

      Geochimica et Cosmochimica Acta

      Volume: 361 Pages: 152-170

    • DOI

      10.1016/j.gca.2023.10.022

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Geothermal input significantly influences riverine and oceanic boron budgets2023

    • Author(s)
      Xiao, J., Zhao, Z., Bochez, J., Ma, X., Pogge von Strandmann, P.A.E., Araoka, D., Yoshimura, T., Hossain, H.M.Z., Kawahata, H. and Jin, Z.
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 621 Pages: 118397-118397

    • DOI

      10.1016/j.epsl.2023.118397

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Factors controlling coral P/Ca nutrient proxy: Insights from Porites culture experiments and synchrotron-based X-ray spectroscopy2023

    • Author(s)
      Li, W., Liu, X.-M., Hu, Y., Suzuki, A. and Yoshimura, T.
    • Journal Title

      Palaeogeography Palaeoclimatology Palaeoecology

      Volume: 615 Pages: 111449-111449

    • DOI

      10.1016/j.palaeo.2023.111449

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Stable Sr isotope (88Sr/86Sr) fractionation in calcite precious corals2022

    • Author(s)
      Yoshimura, T., Wakaki, S., Iwasaki, N., Ishikawa, T. and Ohkouchi, N.
    • Journal Title

      Frontiers in Marine Science

      Volume: 9

    • DOI

      10.3389/fmars.2022.1045909

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Formation of the Rock Canyon Creek carbonate-hosted REE?F?Ba deposit, British Columbia, Canada: Constraints from Mg-Sr isotopes of dolomite, calcite, and fluorite2022

    • Author(s)
      Araoka Daisuke、Simandl George J.、Paradis Suzanne、Yoshimura Toshihiro、Hoshino Mihoko、Kon Yoshiaki
    • Journal Title

      Journal of Geochemical Exploration

      Volume: 240 Pages: 107045-107045

    • DOI

      10.1016/j.gexplo.2022.107045

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The magnesium isotopic compositions of the crust and mantle: A study on the Oman ophiolite2022

    • Author(s)
      Eom Jiwon、Yoshimura Toshihiro、Akizawa Norikatsu、Wakaki Shigeyuki、Ishikawa Tsuyoshi、Takazawa Eiichi、Yamaoka Kyoko、Kawahata Hodaka
    • Journal Title

      Chemical Geology

      Volume: 606 Pages: 120969-120969

    • DOI

      10.1016/j.chemgeo.2022.120969

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Potassium incorporation and isotope fractionation in cultured scleractinian corals2022

    • Author(s)
      Li Wenshuai、Liu Xiao-Ming、Wang Kun、Hu Yongfeng、Suzuki Atsushi、Yoshimura Toshihiro
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 581 Pages: 117393-117393

    • DOI

      10.1016/j.epsl.2022.117393

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Trace metal geochemical and Zn stable isotope data as tracers for anthropogenic metal contributions in a sediment core from Lake Biwa, Japan2021

    • Author(s)
      Kai Nils Nitzsche, Toshihiro Yoshimura, Naoto F. Ishikawa, Nanako O. Ogawa, Katsuhiko Suzuki, Naohiko Ohkouchi
    • Journal Title

      APPLIED GEOCHEMISTRY

      Volume: 134 Pages: 105107-105107

    • DOI

      10.1016/j.apgeochem.2021.105107

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] The impact of Antarctic ice sheet expansion (ca. 34 Ma) on silicate weathering, erosion and the carbon cycle: insights from Li and Mg isotopes2023

    • Author(s)
      Adam David Sproson, Toshihiro Yoshimura, Shigeyuki Wakaki, Takahiro Aze, Tsuyoshi Ishikawa, Yusuke Yokoyama and Naohiko Ohkouchi
    • Organizer
      Goldschmidt Conference 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Insights into fluid sources and flow rates from lithium isotope composition of methane-seep carbonates2023

    • Author(s)
      Yusuke Miyajima, Daisuke Araoka, Toshihiro Yoshimura, Yuki Ota, Atsushi Suzuki, Hideyoshi Yoshioka, Masahiro Suzumura, Daniel Smrzka, Jorn Peckmann and Gerhard Bohrmann
    • Organizer
      Goldschmidt Conference 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Seven million year record of multiple geochemical proxies of planktonic foraminifera shells collected from marine sediment core (IODP Exp.361 Site U1476) after removal of clay and boron-specific contamination influences2023

    • Author(s)
      Kaoru Kubota, Tsuyoshi Ishikawa, Toshihiro Yoshimura, Katsunori Kimoto, Qing Chang, Minoru Ikehara, Yusuke Yokoyama, Francisco J. Jimenez-Espejo, Sidney R Hemming, Stephen Barker and Ian R. Hall
    • Organizer
      Goldschmidt Conference 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 宝石サンゴのカルサイト骨格における Sr 安定同 位体(88Sr/86Sr)分別2023

    • Author(s)
      吉村寿紘、若木重行、岩崎望、石川剛志、大河内直彦
    • Organizer
      地球化学会年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 蒸発実験とシチリア島塩田から採取した石膏および塩水試料を用いた石膏形成時の硫黄同位体分別の推定2023

    • Author(s)
      古知 武、黒田 潤一郎、小川 奈々子、吉村 寿紘、大河内 直彦
    • Organizer
      日本地球惑星科学連合2023年大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] A novel application of Mg and Li isotopes reveals a link between erosion, chemical weathering, and atmospheric CO2 during the expansion of Antarctica’s ice sheets (ca. 34 Ma)2022

    • Author(s)
      Sproson, A.D., Yoshimura, T. Aze, T., Wakaki, S., Ishikawa, T., Yokoyama, Y., Ohkouchi, N.
    • Organizer
      2022 Goldschmidt Conference
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Can Mg and Li isotopes in the authigenic and detrital fractions of sediments be used to trace paleoweathering? Case study: The EOT2022

    • Author(s)
      Sproson, A.D., Yoshimura, T. Aze, T., Wakaki, S., Ishikawa, T., Yokoyama, Y., Ohkouchi, N.
    • Organizer
      America Geophysical Union Fall Meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 表層堆積物に含まれる浮遊性有孔虫チャンバーの微量元素比の変化と個体差2022

    • Author(s)
      吉村 寿紘、常 青、大河内 直彦、石谷 佳之、ウラノバ ダナ、遠藤 博寿、黒田 潤一郎、氏家 由利香
    • Organizer
      日本地球化学会年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] ニュージーランドの更新世陸棚斜面堆積物から読む気候変動2021

    • Author(s)
      吉村 寿紘,大河内 直彦
    • Organizer
      地球環境史学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] The Mg and Li isotopic composition of authigenic and detrital sedimentary phases record Antarctic chemical silicate weathering across the EOT2021

    • Author(s)
      A. D. Sproson, T. Yoshimura, T. Aze, S. Wakaki, T. Ishikawa, Y. Yokoyama, N. Ohkouchi
    • Organizer
      Goldschmidt Conference 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 第四紀海水Sr同位体進化曲線の再構築に向けた超高精度87Sr/86Sr同位体比測定法の開発2021

    • Author(s)
      若木 重行,吉村 寿紘,高柳 栄子,若木 仁美
    • Organizer
      日本地球化学会年会
    • Related Report
      2021 Annual Research Report

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi