文部科学省科学研究費補助金「新学術領域研究（研究領域提案型）」　領域番号4702（平成27～31年度）

海洋混合学の創設：物質循環・気候・生態系の維持と長周期変動の解明

長井　健容

沖縄トラフ・トカラ海峡等、黒潮上流域で高鉛直波数近慣性波シアに伴う乱流が卓越するメカニズムの解明

１.出版物

・ 査読有論文

  1. Nagai, T., H. Saito, K. Suzuki, M. Takahashi (2019), Kuroshio Current: Physical, Biogeochemical and Ecosystem Dynamics, AGU-Wiley, Geophysical Monograph, Vol. 243, 336 p. doi:10.1002/9781119428428

  2. Nagai, T., S. Clayton & Y. Uchiyama (2019). Multiscale routes to supply nutrients through the Kuroshio nutrient stream. In: Kuroshio Current: Physical, Biogeochemical and Ecosystem Dynamics, T. Nagai, H. Saito, K.Suzuki, M. Takahashi (eds.), AGU-Wiley, Geophysical Monograph, Vol. 243, doi:10.1002/9781119428428.ch6

  3. Nagai, T., Otsuka, K., & H. Nakano (2019). The Research Advancements and Historical Episodes brought by the Kuroshio Flowing across Generations, In: Kuroshio Current: Physical, Biogeochemical and Ecosystem Dynamics. In: Kuroshio Current: Physical, Biogeochemical and Ecosystem Dynamics, T. Nagai, H. Saito, K.Suzuki, M. Takahashi (eds.), AGU-Wiley, Geophysical Monograph, Vol. 243, doi:10.1002/9781119428428.ch2

  4. *Tandon, A., T. Nagai, Mixing associated with submesoscale processes In Encyclopedia of Ocean Sciences, Third Edition, Steele, J.H., S.A. Thorpe, and K.T. Turekian (Eds.), Elsevier, DOI: 1016/B978-0-12-409548-9.10952-2, , 英文, 査読有, 科研費番号有

  5. Nagai, G. S. Durán Gómez, The Kuroshio nutrient stream: Where diapycnal mixing matters, In Chemical Oceanography in frontal zones (Igor Belkin Ed.), Springer Nature, 2022

  6. Nagai, T., G. S. Durán, D. A. Otero, Y. Mori, N. Yoshie, K. Ohgi, D. Hasegawa, A. Nishina, T. Kobari (2019), How the Kuroshio Current delivers nutrients to sunlit layers on the continental shelves with aid of near-inertial waves and turbulence, Geophysical Research Letters, 46 (12), 6726– https://doi.org/10.1029/2019GL082680

  7. 長谷川大介, 田中雄大, 松野健, 千手智晴, 堤英輔, 中村啓彦, 仁科文子, 小針統, 吉江直樹, 郭新宇, 長井健容, 奥西武, 安田一郎 (2019), センサによる硝酸塩鉛直乱流拡散フラックスの計測, 沿岸海洋研究, 57, 59-64

  8. 長井健容 (2019), 黒潮上流から続流の鉛直混合過程とその影響に関する考察, 沿岸海洋研究, 57, 43-58

  9. Todd, R. E., F. P. Chavez, S. Clayton, S. Cravatte, M. Goes, M. Graco, X. Lin, J. Sprintall, N. V. Zilberman, et al., (2019) Global perspectives on observing ocean boundary current systems, Frontiers in Marine Science, 6, 423, doi:10.3389/fmars.2019.00423 (38 pages)

  10. Roemmich, D., M. H. Alford, H. Claustre, K.Johnson, B. King, J. Moum, P. Oke, W. B. Owens, S. Pouliquen, S. Purkey, M. Scanderbeg, T. Suga, S. Wijffels, N. Zilberman, et al. (2019) On the future of Argo: A global, full-depth, multi-disciplinary array, Frontiers in Marine Science, 6, 439, doi:10.3389/fmars.2019.00439 (28 pages)

  11. Kobari, T., Honma, T., Hasegawa, D., Yoshie, N., Tsutumi, E., Matsuno, T., Nagai, T., Kanayama, T., Karu, F., Suzuki, K., Tanaka, T., Guo, X., Kume, G., Nishina, A., and Nakamura, H. (2020): Phytoplankton productivity and rapid trophic transfer to microzooplankton stimulated by turbulent nitrate flux in oligotrophic Kuroshio Current, Biogeosciences, 17, 2441–2452, 2020, https://doi.org/10.5194/bg-17-2441-2020

  12. Durán, G. S.,  Nagai, K. Yokawa (2020) Mesoscale warm-core eddies drive interannual modulations of swordfish catch in the Kuroshio Extension System, Frontiers in Marine Science, 7:680. doi: 10.3389/fmars.2020.00680 

  13. Lizarbe Barreto DA, Chevarria Saravia R, Nagai T and Hirata T (2021) Phytoplankton Increase Along the Kuroshio Due to the Large Meander. Front. Mar. Sci. 8:677632. doi: 10.3389/fmars.2021.677632

  14. Hasegawa, D., Matsuno, T., Tsutsumi, E., Senjyu, T., Endoh, T., Tanaka, T., et al. (2021). How a small reef in the Kuroshio cultivates the ocean. Geophysical Research Letters, 48, e2020GL092063. https://doi.org/10.1029/2020GL092063

  15. 橋濱 史典, 纐纈 慎也, 近藤 能子, 佐々木 克徳, 杉本 周作, 高橋 一生, 長井 健容, 西岡 純, 林田 博士, 平井 惇也, 海洋学の10 年展望2021：中緯度, 海の研究, 2021, 30 巻, 5 号, p. 127-154, 公開日 2021/12/22, Online ISSN 2186-3105, Print ISSN 0916-8362, https://doi.org/10.5928/kaiyou.30.5_127, https://www.jstage.jst.go.jp/article/kaiyou/30/5/30_127/_article/-char/ja

  16. Nagai, T., Rosales Quintana, G.M., Durán Gómez, G.S. et al. (2021): Elevated turbulent and double-diffusive nutrient flux in the Kuroshio over the Izu Ridge and in the Kuroshio Extension. J Oceanogr 77, 55–74. https://doi.org/10.1007/s10872-020-00582-2

  17. Nagai, T., Hasegawa, D., Tsutsumi, E. et al. The Kuroshio flowing over seamounts and associated submesoscale flows drive 100-km-wide 100-1000-fold enhancement of turbulence. Commun Earth Environ 2, 170 (2021). https://doi.org/10.1038/s43247-021-00230-7

  18. Durán Gómez GS and Nagai T (2022) Elevated Nutrient Supply Caused by the Approaching Kuroshio to the Southern Coast of Japan. Front. Mar. Sci. 9:842155. doi: 10.3389/fmars.2022.842155

 

・ 査読無論文

 

・ その他の出版物

  1. Nagai, Takeyoshi (2022): 100-km wide 100-1000 fold enhancement of turbulence in the Kuroshio. figshare. Media. https://doi.org/10.6084/m9.figshare.19777453.v1

  2. Nagai, Takeyoshi (2022): Tokara Mixing. figshare. Media. https://doi.org/10.6084/m9.figshare.19618158.v5

  3. Nagai, Takeyoshi; Duran, Silvana (2022): DráGóN Blessings. figshare. Media. https://doi.org/10.6084/m9.figshare.19606999.v3

  4. Nagai, Takeyoshi; Barreto, Daniel Andres Lizarbe; Saravia, Ricardo Chevarria; Hirata, Takafumi (2021): Phytoplankton Increase Along the Kuroshio Due to the Large Meander. figshare. Media. https://doi.org/10.6084/m9.figshare.15164421.v1

 

２. 共同研究の実施状況

 

３. 国際研究集会・学会・シンポジウムの開催実施状況

 

４. 国内研究集会・学会・シンポジウムの開催実施状況

 

５. 領域に関与したポスドク・RA等・若手研究者

  1. Gloria Silvana Duran, 特別聴講学生, アグラリアラモリーナ大学からの交換留学生, 2018年5月−2019年3月

  2. Diego Andre Otero, 特別聴講学生, アグラリアラモリーナ大学からの交換留学生, 2018年10月−2019年3月

  3. 森泰貴, 学部生, 東京海洋大学, 2018年4月−2019年3月

  4. Ricardo Chevarria Saravia, 特別聴講学生, アグラリアラモリーナ大学からの交換留学生, 2019年10月−2020年2月

  5. Daniel Andres Lizarbe Barreto, 特別聴講学生, アグラリアラモリーナ大学からの交換留学生, 2019年4月−2020年2月

 

６. 受賞・招待講演・基調講演等の状況

・受賞

  1. 東京海洋大学学長裁量経費大学改革・機能強化等推進事業「黒潮-親潮域におけるマルチスケール混合現象とその海洋物理・生物・化学的影響解明に資する自律型海洋微細構造観測網の整備」優秀賞受賞　（長井健容、2018年12月18日）

  2. Durán, G. S.,  Nagai, K. Yokawa, Swordfish catch variation in relation to mesoscale eddies in the northwestern Pacific, PICES Annual Meeting October 24, 2019 Victoria, Canada, FIS Best Oral Presentation Award

 

・招待講演

  1. Nagai, T., G. S. Durán, D. A. Otero, N. Yoshie, K. Ohgi, D. Hasegawa, S. Clayton, Y. Uchiyama, How the Kuroshio enriches the southern coast of Japan and its downstream regions (Invited), PICES Annual Meeting October 21, 2019, Victoria, Canada

 

７. アウトリーチ活動

  1. 東京海洋大学プレスリリース,混合ホットスポット：黒潮上流トカラ海峡において帯状の長周期内部波に伴う帯状強乱流層構造を捉えることに初めて成功（11.28）https://www.kaiyodai.ac.jp/topics/news/201711071127.html

 

８. メデイア報道状況（プレスリリース・取材等の結果、報道されたもの）

  1. 2018年7月6日海上保安庁発表の「大蛇行が続く黒潮の観測を実施 ～4月には過去2番目の位置まで流軸が南下～」で有識者としてコメント　https://www1.kaiho.mlit.go.jp/KIKAKU/press/2018/20180706.pdf

  2. AGU EOS Editor’s Vox　https://eos.org/editors-vox/the-kuroshio-current-artery-of-life

 

９. 国際学会での発表

  1. *Nagai, T., S. Clayton, Y. Uchiyama, Multiscale transport, stirring, and mixing processes to supply nutrients through the Kuroshio nutrient stream, JpGU Meeting 2018, Marine ecosystems and biogeochemical cycles: theory, observation and modeling. (2018年5月23日幕張メッセ)

  2. *Nagai, T., D. Hasegawa, H. Nakamura, A. Nishina, R. Inoue, The 100 km wide 100-1000 fold enhancement in turbulent mixing caused by the Kuroshio induced mesoscale hydraulic jump in the lee of Tokara Strait, JpGU Meeting 2018, What we have learned about ocean mixing in the last decade. (2018年5月21日幕張メッセ)

  3. Durán, G. S.,  Nagai, K. Yokawa, Swordfish catch variation in relation to mesoscale eddies in the northwestern Pacific, PICES Annual Meeting October 24, 2019 Victoria, Canada, FIS Best Oral Presentation Award

  4. Nagai, T., D. Hasegawa, E. Tsutsumi, H. Nakamura, A. Nishina, T. Senjyu, T. Endoh, T. Matsuno, R. Inoue, A. Tandon, N. Yoshie, K. Ohgi, A. Nishina, T. Kobari, G. S. Durán, D. A. Otero, Nutrient supply caused by submesoscale and microscale mixing processes in the upstream Kuroshio, Ocean Sciences Meeting Feb. 2020 San Diego, USA

  5. Inoue, R., C. Sukigara,  Nagai, A. J. Fassbender, Y. Takeshita, S. Bishop, E. Oka, Biogeochemical float observations in the Kuroshio recirculation gyre during the spring transition Ocean Sciences Meeting Feb. 2020 San Diego, USA

  6. Matsuno, T., X. Guo, H. Nakamura, E. Tsutsumi, T. Senjyu, T. Endoh, J. Zhang, K. Ichikawa, T. Kobari, N. Yoshie, D. Hasegawa,  Nagai, A. Nishina, A. Sakai, T. Noguchi, M. Chang, Y. J. Yang, S. Jan, C. Villanoy, K. Lee, D. Yanagimoto, I. Yasuda, Intensified vertical mixing around various seamounts along the Kuroshio and its contribution to the ecosystem, Ocean Sciences Meeting Feb. 2020 San Diego, USA

  7. Nagai, T., G.S. Durán, T. Kobari, N. Yoshie, Blending source of turbulence, upwelled nutrients and primary producers in the Kuroshio flowing through the Tokara Strait, AGU Fall Meeting 2020 Virtual

  8. Durán, G.S., Nagai, T., Elevated nutrient supply caused by the Kuroshio induced vertical mixing near the continental slope associated with submesoscale flows and near-inertial waves, AGU Fall Meeting 2020 Virtual

  9. Nagai, T., G.S. Durán, H. Saito, H. Ogawa, T. Kobari, N. Yoshie, Revealing unseen subsurface physical biogeochemical reactions caused by submesoscale instability and associated turbulent mixing in the Kuroshio flowing over seamounts, Ocean Sciences Meeting 2022 Virtual

  10. Durán, G.S., Nagai, T., T. Kobari, H. Nakamura, I. Bjorgvinsdottir, Tracking turbulent mixing and its influence on productivity along the Kuroshio in the Tokara Strait, Ocean Sciences Meeting 2022 Virtual

 

 

１０. 国内学会での発表

  1. *長井健容, 長谷川大介, 堤英輔, 中村啓彦, 仁科文子, 千手智晴, 遠藤貴洋, 井上龍一郎, Amit Tandon, トカラ海峡海山上を流れる黒潮によって発生する慣性ー対称不安定と乱流散逸の直接観測および数値実験, 日本海洋学会2018年度秋季大会, 口頭, 2018.09.

  2. Nagai, T., D. Hasegawa, E. Tsutsumi, H. Nakamura, A. Nishina, T. Senjyu, T. Endoh, T. Matsuno, R. Inoue, A. Tandon, Turbulent mixing and near-inertial internal waves induced by the Kuroshio over seamounts in the Tokara Strait JpGU Annual Meeting May 2019, 幕張

  3. Nagai, T., S. Clayton, Y. Uchiyama, Multiscale routes to supply nutrients through the Kuroshio nutrient stream JpGU Annual Meeting May 2019, 幕張

  4. Nagai, T., G. S. Durán, D. A. Otero, Y. Mori, N. Yoshie, K. Ohgi, D. Hasegawa, A. Nishina, T. Kobari, Very strong turbulent mixing over 30-km and 200-m lateral and vertical scales in the Kuroshio near the continental slope in Hyuganada Sea, JpGU Annual Meeting May 2019, 幕張

  5. Nagai, T., G.S. Durán, The Kuroshio nutrient stream: Where diapycnal mixing matters, JpGU Annual Meeting 2021 Virtual

  6. Durán, G.S., Nagai, T., Elevated nutrient supply caused by the Kuroshio induced vertical mixing near the continental slope associated with submesoscale flows and near-inertial waves, JpGU Annual Meeting 2021 Virtual