Observational study of turbulent heat and near-inertial internal waves under perennial sea ice in the Arctic Ocean: Assessment of the global warming

• Project/Area Number: 17KK0083
• Research Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research)
• Allocation Type: Multi-year Fund
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: The University of Tokyo
• Principal Investigator: Kawaguchi Yusuke 東京大学, 大気海洋研究所, 助教 (00554114)
• Project Period (FY): 2018 – 2021
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥14,560,000 (Direct Cost: ¥11,200,000、Indirect Cost: ¥3,360,000)
• Keywords: 北極海 / 海氷変動 / 地球温暖化 / 熱収支 / 乱流混合 / 内部重力波 / 海氷減少 / 乱流 / 熱塩収支 / 海洋乱流 / 北極海中央海盆域 / MOSAiC / 山岳波 / 海氷変形率 / 渦相関法 / 乱流熱フラックス / 近慣性内部重力波

Outline of Final Research Achievements

For the aim of the assessment of global warming and its implication in the Arctic environment, we participated in the international joint project , MOSAiC, that is led by a German institution. In the project, we took samples of physical oceanographic parameters base on the drifting-ice platform using an ice breaking vessel, R/V Polarstern. In the field survey of ice ocean boundary layer of the Arctic Ocean, movement of water and heat were measured at high-frequency sampling rate. The observation revealed that in the surface water the low salinity melt-water plays important roles in regaining ice formation during winter season. That is, the freshened water is lowered in freezing temperature, and consequently it allows the water to freeze up in relatively mild cooling event in the atmosphere.

Academic Significance and Societal Importance of the Research Achievements

北極海で進行している海氷量の変動（主に減少）は、地球温暖化のグローバルな影響を示す上でもっとも象徴的な事象と言えます。今後の北極海の海氷変動を予測する上で、現場調査から得られる知見はもっとも重要な鍵となります。本研究では、ドイツの砕氷船（Polarstern号）を用いた国際的な観測プロジェクト「MOSAiC」に参加することで、海氷と海洋の間で起きる熱や運動量のやりとりに注目し、海氷変動の実態を明らかにするための現地調査を行いました。

Research Products

• [Int'l Joint Research] Alfred Wegenar Institute(ドイツ) (2018)
• [Journal Article] Overview of the MOSAiC expedition: Physical oceanography (2022)
  • Author(s): Rabe et al.
  • Journal Title: Elementa Science Anthropocene Volume: 10(1) Issue: 1 Pages: 1-62
  • DOI: 10.1525/elementa.2021.00062
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Atmosphere-sea ice-ocean interaction study in Saroma-ko Lagoon, Hokkaido, Japan 2021 (2022)
  • Author(s): Nomura, D., P. Wongpan, T. Toyota, T. Tanikawa, Y. Kawaguchi, T. Ono, T. Ishino, M. Tozawa, T. P. Tamura, I. S. Yabe, E. Y. Son, F. Vivier, A. Lourenco, M. Lebrun, Y. Nosaka, T. Hirawake, A. OOKI, S. Aoki, B. Else, F. Fripiat, J. Inoue, and M. Vancoppenolle
  • Journal Title: Bulletin of Glaciological Research Volume: 40 Issue: 0 Pages: 1-17
  • DOI: 10.5331/bgr.21R02
  • ISSN: 1345-3807, 1884-8044
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Cold Water Upwelling Near the Anadyr Strait: Observations and Simulations (2020)
  • Author(s): Kawaguchi Yusuke、Nishioka Jun、Nishino Shigeto、Fujio Shinzou、Lee Keunjong、Fujiwara Amane、Yanagimoto Daigo、Mitsudera Humio、Yasuda Ichiro
  • Journal Title: Journal of Geophysical Research: Oceans Volume: 125 Issue: 9 Pages: 1-18
  • DOI: 10.1029/2020jc016238
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Saroma-ko Lagoon Observations for sea ice Physico-chemistry and Ecosystems 2019 (SLOPE2019) (2020)
  • Author(s): Nomura, D., P. Wongpan, T. Toyota, T. Tanikawa, Y. Kawaguchi, T. Ono, T. Ishino, M. Tozawa, T. P. Tamura, I. S. Yabe, E. Y. Son, F. Vivier, A. Lourenco, M. Lebrun, Y. Nosaka, T. Hirawake, A. OOKI, S. Aoki, B. Else, F. Fripiat, J. Inoue, and M. Vancoppenolle
  • Journal Title: Bulletin of Glaciological Research Volume: 38 Issue: 0 Pages: 1-12
  • DOI: 10.5331/bgr.19R02
  • NAID: 130007822743
  • ISSN: 1345-3807, 1884-8044
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Influence of warm-core eddy on dissolved methane distribution in the southwestern Canada Basin during late summer/early fall 2015 (2019)
  • Author(s): Bui, O. T. M., S. Kameyama, Y. Kawaguchi, S. Nishino
  • Journal Title: Polar Science Volume: 22 Pages: 100481-100481
  • DOI: 10.1016/j.polar.2019.100481
  • NAID: 130006198750
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Do strong winds impact water mass and nutrient and phytoplankton distributions in the ice-free Canada Basin in the fall?A Eulerian approach to detecting their temporal changes (2019)
  • Author(s): Nishino, S., Y. Kawaguchi, J. Inoue, M. Kawai, N. Harada, T. Kikuchi
  • Journal Title: J. Geophys. Res. Oceans Volume: 125 Issue: 1
  • DOI: 10.1029/2019jc015428
  • Peer Reviewed / Open Access
• [Journal Article] The warming of the Chukchi slope through the Barrow Canyon outflow in the 2016‐2017 winter (2019)
  • 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
  • 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 Ocean (2018)
  • 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
  • Peer Reviewed / Open Access
• [Journal Article] Biogeochemical anatomy of a cyclonic warm-core eddy in the Arctic Ocean (2018)
  • Author(s): Nishino, S., Kawaguchi, Y., Fujiwara, A., Shiozaki, T., Aoyama, M., Harada, N., & Kikuchi, T.
  • Journal Title: Geophysical Research Letters Volume: 45 Issue: 20 Pages: 1-9
  • DOI: 10.1029/2018gl079659
  • Peer Reviewed / Open Access
• [Presentation] Interfacial generation of internal waves & turbulence due to enhanced ice motion for deformed ice floe (2022)
  • Author(s): Kawaguchi, Y., Koenig, Z., Nomura, D., Hoppman, M., Fang, Y-C, Inoue, J., Gallagher, M., Katlein, C., Nicolaus, M., Rabe, B.
  • Organizer: European Geological Union
  • Int'l Joint Research
• [Presentation] 北極海、多年氷下境界層の物理過程に関する研究（MOSAiC観測の報告） (2021)
  • Author(s): Kawaguchi, Y., Koenig, Z., Nomura, D., Hoppman, M., Fang, Y-C, Inoue, J., Gallagher, M., Katlein, C., Nicolaus, M., Rabe, B.
  • Organizer: 日本海洋学会秋
• [Presentation] Roles and effects of inertial sea-ice drift on momentum/heat/salt exchanges at ice-ocean boundary in high-latitude Arctic Ocean: Results from the MOSAiC expedition (2021)
  • Author(s): Kawaguchi, Y., Koenig, Z., Nomura, D., Hoppman, M., Fang, Y-C, Inoue, J., Gallagher, M., Katlein, C., Nicolaus, M., Rabe, B.
  • Organizer: 極地研シンポジウム
  • Int'l Joint Research
• [Presentation] Roles and effects of inertial sea-ice drift on momentum/heat/salt exchanges at ice-ocean boundary in central Arctic Ocean: Results from the MOSAiC expedition (2021)
  • Author(s): Kawaguchi, Y., Koenig, Z., Nomura, D., Hoppman, M., Fang, Y-C, Inoue, J., Gallagher, M., Katlein, C., Nicolaus, M., Rabe, B.
  • Organizer: Ocean Science Meeting
  • Int'l Joint Research
• [Presentation] An Innovative SVT Technology for the Near-Surface Salinity Observations and its Applications to Thermodynamics in Polar Oceans (2021)
  • Author(s): Lunev E., Tolstosheev A., Motyzhev S., Kawaguchi Y., Bezgin A., Smolynitsky V.
  • Organizer: DBCP-37 workshop
  • Int'l Joint Research
• [Presentation] Interfacial generation of internal waves and turbulent heat flux due to enhanced inertial motion for deformed sea-ice floe: Preliminary results from MOSAiC expedition (2021)
  • Author(s): Yusuke Kawaguchi, Zoe Koeing, Mario Hoppman, Daiki Nomura, Jun Inoue, Benjamin Rabe
  • Organizer: European Geological Union
  • Int'l Joint Research
• [Presentation] Ice-ridge internal waves and turbulent heat flux in ice-ocean boundary layer: Observations (2020)
  • Author(s): Yusuke Kawaguchi
  • Organizer: ISAR-6,
  • Int'l Joint Research
• [Presentation] Observational study of internal-wave-induced interior mixing in the Canada Basin Arctic Ocean (2020)
  • Author(s): Eun-yae Son
  • Organizer: ISAR-6,
  • Int'l Joint Research
• [Presentation] Cold water upwelling and entrainment near the Anadyr Strait: Implications to the North Pacific-Arctic interaction (2020)
  • Author(s): Yusuke Kawaguchi
  • Organizer: ISAR-6,
• [Presentation] Cold water upwelling and entrainment near the Anadyr Strait: Implications to the North Pacific Arctic Interaction (2019)
  • Author(s): Yusuke Kawaguchi
  • Organizer: The tenth Symposium on Polar Science
• [Presentation] Year-round observations of sea-ice drift and near-inertial internal waves in the Northwind Abyssal Plain, Arctic Ocean (2019)
  • Author(s): Yusuke Kawaguchi
  • Organizer: The tenth Symposium on Polar Science
• [Presentation] Year-round observations of sea-ice drift and near-inertial internal waves in the Northwind Abyssal Plain, Arctic Ocean (2019)
  • Author(s): 川口 悠介
  • Organizer: EGU
• [Remarks] Ocean at Risk 02「北極海の海氷融解」
  • URL: https://www.cole.p.u-tokyo.ac.jp/curriculum/1848