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The double-sided studies of carbonate scavenging

Research Project

Project/Area Number 17K05717
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Geochemistry/Cosmochemistry
Research InstitutionKyushu University

Principal Investigator

Akagi Tasuku  九州大学, 理学研究院, 教授 (80184076)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords海洋炭酸塩 / カルサイト / アラゴナイト / 希土類元素 / 鉄 / マンガン / 分配 / マンガン団塊 / 海洋 / 炭酸塩 / 炭酸カルシウム / 分配定数 / 微量元素 / 吸着 / 溶解 / 海洋元素循環 / 元素分配 / 炭酸塩溶解 / 鉄マンガンクラスト
Outline of Final Research Achievements

Particles play important roles in vertical transport of elements in a oceanic column. Carbonate comprises one of major particulate phases and experiences a characteristic transition from supersaturation to undersaturation in a column. It is not well understood how elements in carbonate behave during the transition. In this study, we devised a new apparatus to study elemental partitioning during the tradition and applied this to the partitioning of rare earth elements, iron, manganese into carbonate. The following results have been obtained. 1) Iron forms an independent phase on carbonate particles and contributes to elemental partitioning. 2) Manganese enters the lattice of carbonate and promotes the partitioning of elements in carbonates. 3) Rare earth elements prohibit growth in supersaturation and dissolution in undersaturation of carbonate and causes underestimation or overestimation of partitioning values.

Academic Significance and Societal Importance of the Research Achievements

海洋の物質循環は炭素循環や生物生産性に影響を与えるため重要である。海水中の粒子は、元素の鉛直輸送に最も大きな影響をもたらすことは広く認められているが、その影響は粒子の化学に依存し、極めて複雑である。そのため海洋の物質循環モデルなどは粒子を一括りにして、化学を無視して扱われている。本課題研究では、海水中で最も主要な粒子の一つである炭酸塩について、生成時、溶解時の二つの条件での元素の分配挙動を研究した。この成果は、他の化学の異なる粒子相についての研究を促し、海洋の物質循環をより質的に深く理解することが可能になり、将来的に炭素循環や地球の環境変動などを理解する際の基礎となるであろう。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (17 results)

All 2019 2018 2017

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 1 results) Presentation (10 results) (of which Invited: 1 results) Book (1 results)

  • [Journal Article] Characterization of settling particles in the Bering Sea and implications for vertical transportation of multiple elements by diatom frustules2019

    • Author(s)
      90)Emoto Mariko, Kozo Takahashi and Tasuku Akagi
    • Journal Title

      GEOCHEMICAL JOURNAL

      Volume: 53 Issue: 4 Pages: 249-259

    • DOI

      10.2343/geochemj.2.0563

    • NAID

      130007688930

    • ISSN
      0016-7002, 1880-5973
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Double scavenging processes explain the vertical distribution of rare earth elements in the oceans: Importance of surface plankton as a primary scavenger and carbonate/oxide as a secondary scavenger2019

    • Author(s)
      Nishino Hirotaka、Akagi Tasuku
    • Journal Title

      GEOCHEMICAL JOURNAL

      Volume: 53 Issue: 2 Pages: 119-137

    • DOI

      10.2343/geochemj.2.0547

    • NAID

      130007624427

    • ISSN
      0016-7002, 1880-5973
    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Hydrological study of Lyngmossen bog, Sweden: Isotopic tracers (3H, δ2H and δ18O) imply three waters with different mobilities2018

    • Author(s)
      Ooki Seigo、Akagi Tasuku、Jinno Hirooki、Franzen Lars G.、Newton Jason
    • Journal Title

      Quaternary Science Reviews

      Volume: 199 Pages: 97-107

    • DOI

      10.1016/j.quascirev.2018.09.014

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Sources of rare earth elements in shells and soft-tissues of bivalves from Tokyo Bay2017

    • Author(s)
      Tasuku Akagi and Keisuke Edanami
    • Journal Title

      Marine Chemistry

      Volume: 194 Pages: 55-62

    • DOI

      10.1016/j.marchem.2017.02.009

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Corrigendum to “Sources of rare earth elements in shells and soft-tissues of bivalves from Tokyo Bay” [Mar. Chem. 194 (2017) 55-62]2017

    • Author(s)
      Tasuku Akagi and Keisuke Edanami
    • Journal Title

      Marine Chemistry

      Volume: 194 Pages: 80-80

    • DOI

      10.1016/j.marchem.2017.08.009

    • Related Report
      2017 Research-status Report
  • [Journal Article] Plagioclase weathering by mycorrhizal plants in a Ca-depleted catchment, inferred from Nd isotope ratios and REE composition2017

    • Author(s)
      Tasuku Akagi, Tomohiro Miura, Rie Takada and Kazuo Watanabe
    • Journal Title

      GEOCHEMICAL JOURNAL

      Volume: 51 Issue: 6 Pages: 537-550

    • DOI

      10.2343/geochemj.2.0490

    • NAID

      130006243139

    • ISSN
      0016-7002, 1880-5973
    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 炭酸塩への希土類元素の分配を制御する諸因子の解明2019

    • Author(s)
      藤森佳奈、西野博隆, 赤木右
    • Organizer
      2019年度日本地球化学会第66回年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 珪藻の溶解挙動による海洋のAlの鉛直分布の統一的理解2018

    • Author(s)
      赤木 右
    • Organizer
      2018年日本地球化学会年会
    • Related Report
      2018 Research-status Report
  • [Presentation] 速度論過程の影響を排除した、海水-炭酸塩粒子間の希土類元素の分配定数の測定2018

    • Author(s)
      西野 博隆,赤木 右
    • Organizer
      2018年日本地球化学会年会
    • Related Report
      2018 Research-status Report
  • [Presentation] 海洋ケイ酸非定常モデルによる氷期‐間氷期サイクルにおける周期・振幅変化の再現2018

    • Author(s)
      長谷川 貴大,赤木 右
    • Organizer
      2018年日本地球化学会年会
    • Related Report
      2018 Research-status Report
  • [Presentation] FIB-SEM 及びTEM による珪藻中アルミニウムの観察2018

    • Author(s)
      西村 有輝,末次 晶,延寿 里美,上原 誠一郎,赤木 右
    • Organizer
      2018年日本地球化学会年会
    • Related Report
      2018 Research-status Report
  • [Presentation] 珪藻が変える海洋化学、地球環境2018

    • Author(s)
      赤木 右
    • Organizer
      公益財団法人海洋化学研究所
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] 地球化学における消えるホストの問題2017

    • Author(s)
      赤木 右
    • Organizer
      日本地球化学会
    • Related Report
      2017 Research-status Report
  • [Presentation] 海水-炭酸塩粒子間の元素の分配、および炭酸塩の溶解過程における元素の挙 動を研究するための実験手法の開発2017

    • Author(s)
      西野 博隆, 赤木 右
    • Organizer
      日本地球化学会
    • Related Report
      2017 Research-status Report
  • [Presentation] 27Al-MAS NMR を用いた陸から海底までのアルミニウムの状態の追跡2017

    • Author(s)
      西村 有輝,江本 真里子,横山 拓史,高橋 孝三,小野寺 丈尚太郎,原田 尚美,赤木 右
    • Organizer
      日本地球化学会
    • Related Report
      2017 Research-status Report
  • [Presentation] 南大洋における鉄堆積速度変化の新解釈2017

    • Author(s)
      長谷川貴大,赤木右
    • Organizer
      日本地球化学会
    • Related Report
      2017 Research-status Report
  • [Book] 新しい地球惑星科学2019

    • Author(s)
      赤木 右(西山忠男、吉田茂生編)
    • Total Pages
      287
    • Publisher
      培風館
    • ISBN
      9784563025229
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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