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Decadal changes in ocean climate and zooplankton biomass associated with recent sea ice reduction in the Arctic Ocean

Research Project

Project/Area Number 16K00533
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Environmental dynamic analysis
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

ITOH Motoyo  国立研究開発法人海洋研究開発機構, 地球環境部門(北極環境変動総合研究センター), 副主任研究員 (60373453)

Project Period (FY) 2016-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords北極海 / 海洋物理 / 海洋生態 / 環境変動
Outline of Final Research Achievements

Sea ice cover is rapidly declining due to global warming in the Arctic Ocean. However, their influences on marine ecosystems remain unclear because few studies have conducted long-term ecological monitoring at decadal time scales. Mooring-based acoustic backscattering data collected during periods of both high (2000-03) and low sea ice coverage (2010-13) in Barrow Canyon, are used to show that the annual mean zooplankton biomass increased 1.6 hold between the two periods. Our calculations suggest that this biomass change would have increased the grazing pressure by zooplankton, which, in turn, decreased the supply of sinking carbon to benthic organisms during summer, even though phytoplankton production would have increased. Thus, the Chukchi Sea ecosystem is now shifting away from a pelagic-benthic coupled ecosystem towards one that is pelagic-dominated, in which the primary production is not directly connected to the benthic carbon cycle due to increased pelagic zooplankton grazing.

Academic Significance and Societal Importance of the Research Achievements

本研究で示された動物プランクトン量の増加は摂餌圧の変化を通して、海洋生態系の食物連鎖網に影響を与える。動物プランクトンは、太平洋側北極海の主要な魚類である北極タラ、サケの餌となるため、漁業資源の変動にも影響する可能性がある。バロー海底谷で観測された、動物プランクトン量の増加、植物プランクトンへの摂餌圧の増加、底生生物への有機物供給量の減少は、海氷減少が発端となって起こっている。そのため、今後も更なる海氷減少が予測される北極海での食物連鎖網の変化の端緒を捉えた可能性がある。

Report

(6 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (41 results)

All 2021 2020 2019 2018 2017 2016

All Journal Article (8 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 8 results,  Open Access: 8 results) Presentation (33 results) (of which Int'l Joint Research: 25 results)

  • [Journal Article] Mean and seasonal circulation of the eastern Chukchi Sea from moored timeseries in 2013‐142021

    • Author(s)
      Tian Fei、Pickart Robert S.、Lin Peigen、Pacini Astrid、Moore G.W.K.、Stabeno Phyllis、Weingartner Thomas、Itoh Motoyo、Kikuchi Takashi、Dobbins Elizabeth、Bell Shaun、Woodgate Rebecca A.、Danielson Seth L.、Wang Zhaomin
    • Journal Title

      Journal of Geophysical Research: Oceans

      Volume: - Issue: 5

    • DOI

      10.1029/2020jc016863

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Analysis of the Beaufort Gyre freshwater content in 2003-20182019

    • Author(s)
      Proshutinsky, A., R. Krishfield, J. Toole, M.-L. Timmermans, W. Williams, S. Zimmerman, M. Yamamoto-Kawai, T. W. K. Armitage, D. Dukhovskoy, E. Golubeva, G. E. Manucharyan, G. Platov, E. Watanabe, T. Kikuchi, S. Nishino, M. Itoh, S.-H. Kang, K.-H. Cho, K. Tateyama, and J. Zhao
    • Journal Title

      JOURNAL OF GEOPHYSICAL RESEARCH - Oceans

      Volume: 124 Issue: 12 Pages: 9658-9689

    • DOI

      10.1029/2019jc015281

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The warming of the Chukchi slope through the Barrow Canyon outflow in the 2016‐2017 winter2019

    • Author(s)
      Kimura, S., J. Onodera, M. Itoh, T. Kikuchi, S. Nishino, Y. Kawaguchi, E. Watanabe, and N. Harada
    • Journal Title

      JOURNAL OF GEOPHYSICAL RESEARCH - Oceans

      Volume: 124 Issue: 11 Pages: 7437-7456

    • DOI

      10.1029/2019jc015093

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Seasonal to mesoscale variability of water masses and atmospheric conditions in Barrow Canyon, Chukchi Sea2019

    • Author(s)
      Pickart, R., C. Nobre, P. Lin, K. Arrigo, C. Ashjian, C. Berchok, L. Cooper, J. Grebmeier, I. Hartwell, J. He, M. Itoh, T. Kikuchi, S. Nishino, and S. Vagle
    • Journal Title

      Deep Sea Research Part II

      Volume: in press Pages: 32-49

    • DOI

      10.1016/j.dsr2.2019.02.003

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Interannual variation in solar heating in the Chukchi Sea, Arctic Ocean2018

    • Author(s)
      Tsukada, Y., H. Ueno, N. Ohta, M. Itoh, E. Watanabe, T. Kikuchi, S. Nishino, and K. Mizobata
    • Journal Title

      Polar Science

      Volume: 17 Pages: 33-39

    • DOI

      10.1016/j.polar.2018.06.003

    • NAID

      120006882067

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Transport of Pacific Water into the Canada Basin and the formation of the Chukchi Slope Current2018

    • Author(s)
      Spall, M. A., R. S. Pickart, M. Li, M. Itoh, P. Lin, T. Kikuchi, and Y. Qi
    • Journal Title

      Journal of Geophysical Research

      Volume: 123(10) Issue: 10 Pages: 7453-7471

    • DOI

      10.1029/2018jc013825

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Winter water formation in coastal polynyas of the eastern Chukchi shelf: Pacific and Atlantic influences2018

    • Author(s)
      Hirano, D., Y. Fukamachi, K. I. Ohshima, E. Watanabe, A. R. Mahoney, H. Eicken, M. Itoh, D. Simizu, K. Iwamoto, J. Jones, T. Takatsuka, T. Kikuchi, and T. Tamura
    • Journal Title

      Journal of Geophysical Research

      Volume: 123 Issue: 8 Pages: 5688-5705

    • DOI

      10.1029/2017jc013307

    • NAID

      120006559016

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Year-round observations of sea-ice drift and near-inertial internal waves in the Northwind Abyssal Plain, Arctic Ocean2018

    • Author(s)
      Kawaguchi, Y., M. Itoh, Y. Fukamachi, E. Moriya, J. Onodera, T. Kikuchi and N. Harada
    • Journal Title

      Polar Science

      Volume: in press Pages: 1-9

    • DOI

      10.1016/j.polar.2019.01.004

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Increasing zooplankton biomass associated with sea ice loss in the western Arctic Ocean2021

    • Author(s)
      Motoyo Itoh , Minoru Kitamura , Amane Fujiwara , Eddy Carmack , Kazuo Amakasu , Koichi Ara , Mario Uchimiya , Toru Hirawake , Jonaotaro Onodera , Shigeto Nishino , Takashi Kikuch
    • Organizer
      Alaska Marine Science Symposium
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Long term variability of Barrow Canyon fluxes and its impact on subsurface warming in the western Arctic Ocean2021

    • Author(s)
      Motoyo Itoh, Takashi Kikuchi, Shigeto Nishino
    • Organizer
      Arctic Science Summit Week 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Preliminary results of the R/V Mirai Arctic Ocean cruise in 20202021

    • Author(s)
      Nishino Shigeto, Amane Fujiwara, Motoyo Itoh, Jonaotaro Onodera, Akihiko Murata, Takashi Kikuchi
    • Organizer
      Arctic Science Summit Week 2021 Science Conference
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mean and Seasonal Circulation of the Eastern Chukchi Sea from Moored Timeseries in 2013‐ 142021

    • Author(s)
      Robert Pickart, Fei Tian, Peigen Lin, Astrid Pacini, Kent Moore, Phyllis Stabeno, Thomas Weingartner, Motoyo Itoh, Takashi Kikuchi, Elizabeth Dobbins, Shaun Bell, Rebecca Woodgate, Zhaomin Wang
    • Organizer
      Alaska Marine Science Symposium
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Increasing zooplankton biomass associated with sea ice loss in the western Arctic Ocean2020

    • Author(s)
      Motoyo Itoh , Minoru Kitamura , Amane Fujiwara , Eddy Carmack , Kazuo Amakasu , Koichi Ara , Mario Uchimiya , Toru Hirawake , Jonaotaro Onodera , Shigeto Nishino , Takashi Kikuch
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Summary of the R/V Mirai Arctic Ocean cruise in 20202020

    • Author(s)
      Nishino Shigeto, Amane Fujiwara, Motoyo Itoh, Jonaotaro Onodera, Akihiko Murata, Takashi Kikuchi
    • Organizer
      The 11th symposium on polar science
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 北極海バロー海底谷を通過する夏季太平洋水の昇温2020

    • Author(s)
      伊東素代, 菊地隆, 西野茂人
    • Organizer
      日本海洋学会 2020 年度秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Long term variability of Barrow Canyon fluxes and its impact on subsurface warming in the western Arctic Ocean2020

    • Author(s)
      Itoh, M., T. Kikuchi, S. Nishino
    • Organizer
      Sixth International Symposium on the Arctic Research (ISAR-6) Online Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Pacific water in the northeastern Chukchi Sea2020

    • Author(s)
      Muramatsu, M., H. Ueno, M. Itoh, E. Watanabe, and J. Onodera
    • Organizer
      Sixth International Symposium on the Arctic Research (ISAR-6) Online Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] The warming of the Chukchi slope through the Barrow Canyon outflow in the 2016‐2017 winter2020

    • Author(s)
      Kimura, S., J. Onodera, M. Itoh, T. Kikuchi, S. Nishino, Y. Kawaguchi, E. Watanabe, N. Harada
    • Organizer
      Ocean Sciences Meeting 2020
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Long term variability of Barrow Canyon fluxes and its impact on sub surface warming in the Canada Basin2019

    • Author(s)
      Itoh, M., T. Kikuchi, S. Nishino
    • Organizer
      17th ASOF-ISSG Meeting and Workshop
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Nutrient and phytoplankton distributions associated with ocean circulation, eddies, and mixing in the Pacific Arctic Region2019

    • Author(s)
      Nishino, S., A. Fujiwara, Y. Kawaguchi, T. Shiozaki, M. Itoh, T. Hirawake, M. Yamamoto-Kawai, M. Aoyama, N. Harada, T. Kikuchi
    • Organizer
      Future Oceans 2 - the 2nd IMBeR Open Science Conference
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] チャクチ海北東部陸棚縁辺部における太平洋起源水の移流2019

    • Author(s)
      村松美幌, 上野洋路, 伊東素代, 渡邉英嗣, 小野寺丈尚太郎
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Pacific water in the northeastern Chukchi Sea2019

    • Author(s)
      Muramatsu, M., H. Ueno, M. Itoh, E. Watanabe, J. Onodera
    • Organizer
      The North Pacific Marine Science Organization (PICES) 2019 Annual Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Particle flux change reflecting input of Pacific-origin water in the southwestern Canada Basin2019

    • Author(s)
      Onodera, J., S. Kimura, M. Itoh, E. Watanabe, K. Mizobata, Y. Tanaka, N. Harada
    • Organizer
      Future Oceans 2 - the 2nd IMBeR Open Science Conference
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] High resolution sea ice motion analysis with MODIS data in the western Arctic region2019

    • Author(s)
      Yaguchi, S., N. Kimura, M. Itoh, Y. Fukamachi, T. Kikuchi, and H. Yamaguchi
    • Organizer
      The 34th International Symposium on the Okhotsk Sea and Polar Ocean 2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 西野茂人、藤原周、川口悠介、菊地隆、伊東素代 2017年「みらい」北極航海概要と観測結果の報告2019

    • Author(s)
      西野茂人、藤原周、川口悠介、菊地隆、伊東素代
    • Organizer
      ブルーアースサイエンス・テク2019
    • Related Report
      2018 Research-status Report
  • [Presentation] On the warming of the Chukchi slope through the Barrow Canyon outflow in the winter of 2016-172019

    • Author(s)
      Kimura, S., J. Onodera, M. Itoh, T. Kikuchi, and S. Nishino
    • Organizer
      Polar Marine Science (GRS) Gordon Research Seminar
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Brief update of recent activities and results for DBO: Japan DBO results2018

    • Author(s)
      Itoh, M.
    • Organizer
      Pacific Arctic Group 2018 Fall meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 2017年「みらい」北極航海概要/Summary of the R/V Mirai Arctic Ocean cruise in 20172018

    • Author(s)
      西野茂人、藤原周、川口悠介、菊地隆、伊東素代
    • Organizer
      JpGU2018 日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Jonaotaro Onodera, Eiji Watanabe, Kohei Mizobata, Yuichiro Tanaka, Motoyo Itoh, Naomi Harada Lateral advection of biogenic particles in the southwestern Canada Basin, Arctic Ocean2018

    • Author(s)
      Onodera, J., E. Watanabe, K. Mizobata, Y. Tanaka, M. Itoh, and N. Harada
    • Organizer
      JpGU2018 日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] チャクチ海北東部陸棚縁辺部における太平洋起源水の移流2018

    • Author(s)
      村松美幌、上野洋路、伊東素代、渡邉英嗣、小野寺丈尚太郎
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] On the warming of the Chukchi slope through the Barrow Canyon outflow in the winter of 2016-172018

    • Author(s)
      Kimura, S., J. Onodera, M. Itoh, T. Kikuchi, and S. Nishino
    • Organizer
      Forum for Arctic Modelling and Observational Synthesis 2018 Annual Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Sea-ice thickness from moored ice-profiling sonar in the Canada Basin, Arctic Ocean2018

    • Author(s)
      M. Itoh, Y. Fukamachi, N. Kimura, R.A. Krishfield, T. Kikuchi, E. Moriya, J. Onodera, N. Harada
    • Organizer
      Fifth International Symposium on Arctic Research (ISAR-5)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Interannual variabilities of Pacific Water inflow into the Arctic basin via Barrow Canyon2017

    • Author(s)
      Itoh, M., T. Kikuchi, S. Nishino
    • Organizer
      Alaska Marine Science Symposium
    • Place of Presentation
      Anchorage, Alaska, USA
    • Year and Date
      2017-01-24
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Interannual variabilities of Pacific Water inflow into the Arctic basin via Barrow Canyon2017

    • Author(s)
      M. Itoh, T. Kikuchi, S. Nishino
    • Organizer
      Arctic Science Summit Week 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Sea-ice thickness from moored ice-profiling sonar in the Canada Basin, Arctic Ocean2017

    • Author(s)
      M. Itoh, Y. Fulamachi, N. Kimura, R.A. Krishfield, T. Kikuchi, E. Moriya, J. Onodera, N. Harada
    • Organizer
      Arctic Change 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] バロー海底谷における太平洋水のフラックスと北極海の温暖化への影響2017

    • Author(s)
      伊東素代, 菊地隆, 西野茂人
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Research-status Report
  • [Presentation] 係留系観測による北極海カナダ海盆の海氷厚の季節変動2017

    • Author(s)
      伊東素代, 深町康, 木村詞明, R.A. Krishfield, 菊地隆, 守家衣利加, 小野寺丈尚太郎, 原田尚美
    • Organizer
      日本海洋学会2017年秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Wind-driven variability in subsurface warm layers of the Chukchi shelf break2016

    • Author(s)
      Watanabe, E., J. Onodera, M. Itoh, S. Nishino, T. Kikuchi
    • Organizer
      ArcticNet Annual Scientific Meeting 2016
    • Place of Presentation
      Winnipeg, Manitoba, Canada
    • Year and Date
      2016-12-07
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Interannual variabilties of fluxes in Barrow Canyon from 2010-2014 : results from the2016

    • Author(s)
      Itoh, M., T. Kikuchi, Y. Fukamachi, R. Pickart
    • Organizer
      2016 Pacific Arctic Group Fall Meeting
    • Place of Presentation
      青島, 中国
    • Year and Date
      2016-10-27
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 北極海チャクチ陸棚縁における冬季海氷下の亜表層暖水輸送2016

    • Author(s)
      渡邉英嗣, 小野寺丈尚太郎, 伊東素代, 西野茂人, 菊地隆
    • Organizer
      日本海洋学会2016年度秋季大会
    • Place of Presentation
      鹿児島大学(鹿児島県鹿児島市)
    • Year and Date
      2016-09-14
    • Related Report
      2016 Research-status Report
  • [Presentation] 西部北極海における厳冬期の亜表層暖水輸送2016

    • Author(s)
      渡邉英嗣, 小野寺丈尚太郎, 伊東素代, 西野茂人, 菊地隆
    • Organizer
      日本地球惑星科学連合2016年大会
    • Place of Presentation
      幕張メッセ(千葉県千葉市)
    • Year and Date
      2016-05-26
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2022-01-27  

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