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Removal of recalcitrant dissolved black carbon from the deep ocean.

Research Project

Project/Area Number 19H04249
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionHokkaido University

Principal Investigator

Youhei Yamashita  北海道大学, 地球環境科学研究院, 准教授 (50432224)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
Keywords炭素循環 / 燃焼起源有機物 / 溶存有機物 / 海洋深層 / 生物地球化学 / 海洋
Outline of Research at the Start

森林火災や化石燃料の燃焼に伴い不完全燃焼物が生成し、その一部は多環芳香族構造を有する燃焼起源有機物である。これらの燃焼起源有機物の大部分は生物によって容易には分解されない成分であり、炭素を超難分解性有機物という形で固定する事により、長期的な炭素循環を制御し得る。近年、海水中に燃焼起源有機物が存在する事が示されたが、時空間分布に関する情報が極めて乏しく、その起源や除去過程は分かっていない。本研究では、南北太平洋、ベーリング海、インド洋や南大洋の広範な海域における燃焼起源有機物の空間分布を明らかにし、海洋深層における燃焼起源有機物の起源や除去過程を解明する。

Outline of Final Research Achievements

Pyrogenic organic matter (PyOM) is biologically recalcitrant, and thus, is one of the important factors shaping global carbon cycle with long time scale. PyOM has recently been observed in dissolved organic matter fraction in the ocean. However, environmental dynamics of dissolved PyOM in the ocean has not been well elucidated. In this study, we showed the basin scale distribution of dissolved PyOM in the Pacific Ocean from the Southern Ocean to western North Pacific Ocean. We found decrease in dissolved PyOM concentration along with deep ocean circulation and indicated that dissolved PyOM is removed from the deep ocean via sorption onto sinking particles. We estimated the global removal flux as 0.040-0.085 Pg/yr which is larger than the input fluxes from river and atmosphere. The imbalance between removal and input fluxes of dissolved PyOM suggest that there is missing source of dissolved PyOM in the ocean.

Academic Significance and Societal Importance of the Research Achievements

森林火災などのバイオマス燃焼に伴い大気にCO2が放出され、この放出プロセスは広く認知されている。バイオマス燃焼時には炭や煤などの燃焼起源有機物も生成され、その全球フラックスはCO2放出フラックスの10%程度を占めるが、このプロセスはあまり知られていない。燃焼起源有機物の多くは超難分解性成分であり、地球表層のどこかに蓄積している可能性がある。この蓄積は、CO2を有機物として地球表層炭素循環から隔離することに相当するため、燃焼起源有機物の生成は注目すべきプロセスである。本研究では、未知であった海洋における燃焼起源有機物の動態を明らかにし、その社会的認知の向上に貢献した。

Report

(4 results)
  • 2022 Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (16 results)

All 2022 2021 2020 2019 Other

All Journal Article (7 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 7 results,  Open Access: 5 results) Presentation (6 results) Remarks (3 results)

  • [Journal Article] Factors Controlling the Spatial Distribution of Dissolved Organic Matter With Changes in the C/N Ratio From the Upper to Lower Reaches of the Ishikari River, Japan2022

    • Author(s)
      Takaki Yuji、Hattori Keisuke、Yamashita Youhei
    • Journal Title

      Frontiers in Earth Science

      Volume: 10 Pages: 826907-826907

    • DOI

      10.3389/feart.2022.826907

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Fate of dissolved black carbon in the deep Pacific Ocean2022

    • Author(s)
      Yamashita Youhei、Nakane Motohiro、Mori Yutaro、Nishioka Jun、Ogawa Hiroshi
    • Journal Title

      Nature Communications

      Volume: 13 Issue: 1 Pages: 307-307

    • DOI

      10.1038/s41467-022-27954-0

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Stable Water Isotope Assessment of Tundra Wetland Hydrology as a Potential Source of Arctic Riverine Dissolved Organic Carbon in the Indigirka River Lowland, Northeastern Siberia2021

    • Author(s)
      Takano Shinya、Yamashita Youhei、Tei Shunsuke、Liang Maochang、Shingubara Ryo、Morozumi Tomoki、Maximov Trofim C.、Sugimoto Atsuko
    • Journal Title

      Frontiers in Earth Science

      Volume: 9 Pages: 699365-699365

    • DOI

      10.3389/feart.2021.699365

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Widespread distribution of allochthonous fluorescent dissolved organic matter in the intermediate water of the North Pacific2021

    • Author(s)
      Yamashita Youhei、Tosaka Tetsu、Bamba Rise、Kamezaki Ryuichi、Goto Shuji、Nishioka Jun、Yasuda Ichiro、Hirawake Toru、Oida Joji、Obata Hajime、Ogawa Hiroshi
    • Journal Title

      Progress in Oceanography

      Volume: 191 Pages: 102510-102510

    • DOI

      10.1016/j.pocean.2020.102510

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Transport of dissolved black carbon from marginal sea sediments to the western North Pacific2021

    • Author(s)
      Mori, Y., J. Nishioka, S. Fujio, Y. Yamashita
    • Journal Title

      Prog, Oceanogr.

      Volume: 193 Pages: 102552-102552

    • DOI

      10.1016/j.pocean.2021.102552

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Relationships between dissolved black carbon and dissolved organic matter in streams2021

    • Author(s)
      Yamashita, Y., Kojima, D., Yoshida, N., Shibata, H.
    • Journal Title

      Chemosphere

      Volume: 271 Pages: 129824-129824

    • DOI

      10.1016/j.chemosphere.2021.129824

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Shelf humic substances as carriers for basin-scale iron transport in the North Pacific2020

    • Author(s)
      Yamashita, Y., J. Nishioka, H. Obata, and H. Ogawa
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 4505-4505

    • DOI

      10.1038/s41598-020-61375-7

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 海洋における溶存黒色炭素の挙動2022

    • Author(s)
      山下洋平
    • Organizer
      金沢大学環日本海域環境研究センター研究集会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 山下 洋平、児島 大貴、吉田 なつ美、柴田 英昭2021

    • Author(s)
      渓流水中の溶存黒色炭素の起源
    • Organizer
      JpGU 2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] 沿岸域における燃焼起源溶存有機物の挙動2021

    • Author(s)
      石坂洸太、山下洋平
    • Organizer
      有機地球化学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 北太平洋における中層水循環に伴う外来性溶存有機物の輸送2020

    • Author(s)
      山下 洋平, 森 雄太郎, 遠坂 哲, 亀崎 龍一, 後藤 周史, 西岡 純, 馬場 梨世, 安田 一郎, 藤尾 伸三, 平譯 享, 大井田 穣示, 小畑 元, 小川 浩史
    • Organizer
      2020秋季海洋学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 北太平洋中層水による外来性腐植様溶存有機物の輸送2019

    • Author(s)
      山下 洋平, 西岡 純, 小畑 元, 小川 浩史
    • Organizer
      JpGU 2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 東部インド洋における燃焼起源溶存有機物の分布と動態に関する研究2019

    • Author(s)
      森 雄太郎, 山下 洋平, 小川 浩史
    • Organizer
      2019秋季海洋学会
    • Related Report
      2019 Annual Research Report
  • [Remarks] 研究室ホームページ

    • URL

      https://pablos.ees.hokudai.ac.jp/yamashita/

    • Related Report
      2021 Annual Research Report
  • [Remarks] プレスリリース

    • URL

      https://www.hokudai.ac.jp/news/2022/01/post-971.html

    • Related Report
      2021 Annual Research Report
  • [Remarks] 山下研ホームページ

    • URL

      https://pablos.ees.hokudai.ac.jp/yamashita/

    • Related Report
      2020 Annual Research Report 2019 Annual Research Report

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Published: 2019-04-18   Modified: 2024-01-30  

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