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Evaluation of phytoplankton bloom dynamics focused on sea-ice types

Research Project

Project/Area Number 21K14894
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 40030:Aquatic bioproduction science-related
Research InstitutionNational Institute of Polar Research (2023)
Hokkaido University (2021-2022)

Principal Investigator

Waga Hisatomo  国立極地研究所, 国際極域・地球環境研究推進センター, 特任助教 (30869805)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords植物プランクトン / 北極海 / 海氷 / 衛星リモートセンシング
Outline of Research at the Start

海洋の基礎生産者である植物プランクトンは、光と栄養素が潤沢な環境下でブルームを形成する。従来の北極海では、海氷融解直後に発生する氷縁ブルームが卓越していた。しかしながら、近年では海氷融解から数週間後に発生する開放水面ブルームが頻繁に観測されており、氷縁ブルームから開放水面ブルームへと移行している可能性が示されている。本研究では、海底堆積物を含む海氷「Dirty Ice」と 含まない海氷「Clear Ice」を区別することに初めて着目し、北極海の植物プランクトンブルーム発生プロセスに対する理解を深める。その上で、北極海における氷縁ブルームから開放水面ブルームへの移行を正確に評価・予測する。

Outline of Final Research Achievements

Typical phytoplankton bloom type in the Arctic has been characterized as a single bloom associated with sea-ice retreat along the ice edge (ice-edge bloom). However, recent studies have identified potential increment of phytoplankton blooms in open water (open-water bloom). This study focused on sediment-laden sea ice and sediment-free clean ice and their influences on phytoplankton bloom types in the Arctic. Our results indicate that sediment-laden ice and clean ice foster development of ice-edge bloom and open-water blooms, respectively. These findings clearly demonstrated that sea-ice type (e.g., sediment-laden or sediment-free sea ice) could be an important factor for diverse studies in the Arctic, particularly research on phytoplankton communities and, therefore, marine ecosystems where phytoplankton play an important role as a primary producer.

Academic Significance and Societal Importance of the Research Achievements

氷縁ブルームから開放水面ブルームへの移行を正しく評価するためには, 氷縁ブルーム・開放水面ブルーム発生プロセスを理解することが不可欠である. 本研究は, Dirty IceとClear Iceを区別し, それぞれの海氷が植物プランクトンの増殖過程に及ぼす影響に初めて着目する先駆的な取り組みである. さらに, 植物プランクトンの増殖過程に対してDirty IceとClear Iceが異なる影響を及ぼすことが明らかとなったことで, 単に海氷として扱うのではなく, Dirty IceとClear Iceを区別することの重要性を新たに提示した.

Report

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

    (15 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (2 results) Journal Article (5 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (8 results) (of which Int'l Joint Research: 8 results)

  • [Int'l Joint Research] University of Alaska Fairbanks/University of Washington(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Korea Polar Research Institute(韓国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Classification of optical water groups in the subarctic pacific and adjacent seas using satellite-derived light absorption spectra of chromophoric dissolved organic matter2024

    • Author(s)
      Oida Joji、Hirawake Toru、Yamashita Youhei、Abe Hiroto、Nishioka Jun、Waga Hisatomo、Nomura Daiki、Kakehi Shigeho
    • Journal Title

      Deep Sea Research Part I: Oceanographic Research Papers

      Volume: 208 Pages: 104313-104313

    • DOI

      10.1016/j.dsr.2024.104313

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Performance of primary production algorithm using absorption coefficient of phytoplankton in the Pacific Arctic2022

    • Author(s)
      Futsuki Ryosuke、Hirawake Toru、Fujiwara Amane、Waga Hisatomo、Kikuchi Takashi、Nishino Shigeto、Isada Tomonori、Suzuki Koji、Watanabe Yutaka W.
    • Journal Title

      Journal of Oceanography

      Volume: 78 Issue: 4 Pages: 311-335

    • DOI

      10.1007/s10872-022-00646-5

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Contribution of Small Phytoplankton to Primary Production in the Northern Bering and Chukchi Seas2022

    • Author(s)
      Park Jung-Woo、Kim Yejin、Kim Kwan-Woo、Fujiwara Amane、Waga Hisatomo、Kang Jae Joong、Lee Sang-Heon、Yang Eun-Jin、Hirawake Toru
    • Journal Title

      Water

      Volume: 14 Issue: 2 Pages: 235-235

    • DOI

      10.3390/w14020235

    • Related Report
      2022 Research-status Report
  • [Journal Article] A neural network-based method for satellite-based mapping of sediment-laden sea ice in the Arctic2022

    • Author(s)
      Waga Hisatomo、Eicken Hajo、Light Bonnie、Fukamachi Yasushi
    • Journal Title

      Remote Sensing of Environment

      Volume: 270 Pages: 112861-112861

    • DOI

      10.1016/j.rse.2021.112861

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Variability in spring phytoplankton blooms associated with ice retreat timing in the Pacific Arctic from 2003-20192021

    • Author(s)
      Waga Hisatomo、Eicken Hajo、Hirawake Toru、Fukamachi Yasushi
    • Journal Title

      PLOS ONE

      Volume: 16 Issue: 12 Pages: 0261418-0261418

    • DOI

      10.1371/journal.pone.0261418

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Satellite remote sensing of phytoplankton size structure in optically complex Arctic waters: a comparison between conventional regression versus machine learning approaches2024

    • Author(s)
      Waga, H., Fujiwara, A., Hirawake, T., Ackleson, S.G., and Moses, W.J.
    • Organizer
      Ocean Sciences Meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High-resolution measurements of primary production in the Northern Gulf of Alaska2024

    • Author(s)
      Waga, H., Kelly, T., Lowin, B., Strom, S., and Burt, W.
    • Organizer
      Alaska Marine Science Symposium
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Sediments incorporated into sea ice: Implications for phytoplankton growth2023

    • Author(s)
      Waga, H., Oggier, M., Whitmore, L., and Fujiwara, A.
    • Organizer
      Pacific Arctic Group Meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A neural network-based method for satellite mapping of sediment-laden sea ice in the Arctic2022

    • Author(s)
      Waga, H., Eicken, H., Light, B., Fukamachi, Y.
    • Organizer
      International Circumpolar Remote Sensing Symposium
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Detection of biologically productive water mass from ocean color satellite using chromophoric dissolved organic matter (CDOM)2022

    • Author(s)
      Oida, J., Hirawake, T., Yamashita, Y., Abe, H., Nishioka, J., Waga, H., Nomura, D., Kakehi, S.
    • Organizer
      ESSAS Annual Science Meeting
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Satellite-based monitoring of phytoplankton phenology using a parametric modeling approach in the Northern Gulf of Alaska2022

    • Author(s)
      Waga, H.
    • Organizer
      ESSAS Annual Science Meeting
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] A neural network-based method for satellite-based mapping of sediment-laden sea ice in the Arctic2022

    • Author(s)
      Waga, H., Eicken, H., Light, B., Fukamachi, Y.
    • Organizer
      Ocean Sciences Meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] A parametric modeling approach for satellite-based monitoring of phytoplankton bloom features in the Pacific Arctic2022

    • Author(s)
      Waga, H., Eicken, H., Hirawake, T., and Fukamachi, Y.
    • Organizer
      Alaska Marine Science Symposium
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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

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