Development of the observation system of three-dimensional small-scale flow structures: Fill the observation gap between sub-mesoscale and turbulence

• Project/Area Number: 25707036
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Hokkaido University
• Principal Investigator: NAKAMURA Tomohiro 北海道大学, 低温科学研究所, 講師 (60400008)
• Research Collaborator: SHIMODA Chikara ; KURODA Hiroshi ; FUJITA Kazuyuki
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥27,040,000 (Direct Cost: ¥20,800,000、Indirect Cost: ¥6,240,000); Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥24,700,000 (Direct Cost: ¥19,000,000、Indirect Cost: ¥5,700,000)
• Keywords: 海洋物理 / 乱流 / サブメソスケール / 内部波 / 微細流動構造

Outline of Final Research Achievements

Mixing is a fundamental factor in oceanography, as it controls the transport of heat and dissolved materials in the ocean together with ocean circulation. However, the actual state and nature of small-scale three-dimensional structures (horizontal scales < O (1 km)), which drives mixing, have been obscured by the lack of means of observation. This study is the first achievement of observing such small-scale structures. For this end, we devised and developed an observation system of small-scale three-dimensional flow structures. With this system, we observed small-scale structures of transitional processes toward turbulence from the breaking of large-amplitude internal waves or sub-mesoscale eddies in the Kuril Straits and Oyashio region.

Research Products

• [Journal Article] Multi-decadal scale changes in the intermediate water mass in the Sea of Okhotsk and North Pacific and their mechanisms (2016)
  • Author(s): 中野渡拓也，三寺史夫，中村知裕
  • Journal Title: 低温科学 Volume: 74 Pages: 127-141
  • DOI: 10.14943/lowtemsci.74.127
  • NAID: 120005743114
  • ISSN: 1880-7593
  • Year and Date: 2016-03-31
  • Peer Reviewed / Open Access
• [Journal Article] Potential source areas of dissolved iron to dense shelf water in the Sea of Okhotsk (2016)
  • Author(s): 内本圭亮，中村知裕, 西岡純, 三寺史夫, 三角和弘, 津旨大輔, 若土正曉
  • Journal Title: 低温科学 Volume: 74 Pages: 95-104
  • DOI: 10.14943/lowtemsci.74.95
  • NAID: 120005743111
  • Year and Date: 2016-03-31
  • Peer Reviewed / Open Access
• [Journal Article] The role of Pacific marginal seas in linking adjacent land with ocean (2016)
  • Author(s): 西岡純，三寺史夫，白岩孝行，関宰，中村知裕，的場澄人，江淵直人
  • Journal Title: 低温科学 Volume: 74 Pages: 175-180
  • DOI: 10.14943/lowtemsci.74.175
  • NAID: 120005743119
  • ISSN: 1880-7593
  • Year and Date: 2016-03-31
  • Peer Reviewed / Open Access
• [Journal Article] Oceanic fronts and jets around Japan: a review (2015)
  • Author(s): Kida, S., H. Mitsudera, S. Aoki, X. Guo, S. Ito, F. Kobashi, N. Komori, A. Kubokawa, T. Miyama, R. Morie, H. Nakamura, T. Nakamura, H. Nakano, H. Nishigaki, M. Nonaka, H. Sasaki, Y. N. Sasaki, T. Suga, S. Sugimoto, B. Taguchi, K. Takaya, T. Tozuka, H. Tsujino, and N. Usui
  • Journal Title: Journal of Oceanography Volume: 未定 Issue: 5 Pages: 1561-1577
  • DOI: 10.1007/s10872-015-0283-7
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Causes of the Multidecadal-Scale Warming of the Intermediate Water in the Okhotsk Sea and Western Subarctic North Pacific (2015)
  • Author(s): Nakanowatari, T., T. Nakamura, K. Uchimoto, H. Uehara, H. Mitsudera, K.I. Ohshima, H. Hasumi, M. Wakatsuchi
  • Journal Title: Journal of Climate Volume: 28 Issue: 2 Pages: 714-736
  • DOI: 10.1175/jcli-d-14-00172.1
  • NAID: 120005624079
  • Peer Reviewed / Open Access
• [Journal Article] Overturning circulation that ventilates the intermediate layer of the Sea of Okhotsk and the North Pacific: The role of salinity advection (2015)
  • Author(s): Matsuda, J., H. Mitsudera, T. Nakamura, Y. Sasajima, H. Hasumi and M. Wakatsuchi
  • Journal Title: Journal of Geophysical Research: Oceans Volume: 120 Issue: 3 Pages: 1462-1489
  • DOI: 10.1002/2014jc009995
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Effects of temporal variation in tide-induced vertical mixing in the Kuril Straits on the thermohaline circulation originating in the Okhotsk Sea (2014)
  • Author(s): Nakamura, T., Y. Takeuchi, K. Uchimoto, H. Mitsudera
  • Journal Title: Progress in Oceanography Volume: 126 Pages: 135-145
  • DOI: 10.1016/j.pocean.2014.05.007
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Simulation of high concentration of iron in dense shelf water in the Okhotsk Sea (2014)
  • Author(s): Uchimoto, K., T. Nakamura, J. Nishioka, H. Mitsudera, K. Misumi, D. Tsumune、M. Wakatsuchi
  • Journal Title: Progress in Oceanography Volume: 126 Pages: 194-210
  • DOI: 10.1016/j.pocean.2014.04.018
  • NAID: 120005460253
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Remotely propagating salinity anomaly varies the source of the North Pacific ventilation (2014)
  • Author(s): Uehara, H., Kruts, A. A., Mitsudera, H., Nakamura, T., Volkov, Y. N., Wakatsuchi, M
  • Journal Title: Progress in Oceanography Volume: 126 Pages: 80-97
  • DOI: 10.1016/j.pocean.2014.04.016
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] 北太平洋高解像度海洋海氷モデルと物質循環モデルの結合実験 (2016)
  • Author(s): 吉成浩志, 三寺史夫,, 中野渡拓也, 中村知裕, 内本圭亮, 羽角博康, 若土正暁
  • Organizer: 2016年度 日本海洋学会 春季大会
  • Place of Presentation: 東京大学本郷キャンパス, 東京
  • Year and Date: 2016-03-14
• [Presentation] Effects of temporal variation in tide-induced vertical mixing on thermohaline circulation: Numerical experiments for the case of the Okhotsk Sea (2016)
  • Author(s): Nakamura,T., Y. Takeuchi, K. Uchimoto, H. Mitsuderea, M. Wakatsuchi
  • Organizer: 2016 Ocean Sciences Meeting
  • Place of Presentation: Ernest N. Morial Convention Center, New Orleans, LA, USA
  • Year and Date: 2016-02-21
  • Int'l Joint Research
• [Presentation] Theoretical analysis of vertical mode internal waves affected by a vortex (2016)
  • Author(s): Ito, K. and T. Nakamura
  • Organizer: 2016 Ocean Sciences Meeting
  • Place of Presentation: Ernest N. Morial Convention Center, New Orleans, LA, USA
  • Year and Date: 2016-02-21
  • Int'l Joint Research
• [Presentation] Observations of submesoscale eddies in Oyashio and Kuril regions (2015)
  • Author(s): Nakamura, T.
  • Organizer: 2015年度 日本海洋学会 秋季大会 シンポジウムA
  • Place of Presentation: 愛媛大学城北キャンパス, 松山
  • Year and Date: 2015-09-26
  • Invited
• [Presentation] 準線形・非線形での渦と内部波の相互作用 (2015)
  • Author(s): 伊藤薫, 中村知裕
  • Organizer: 2015年度 日本海洋学会 秋季大会
  • Place of Presentation: 愛媛大学城北キャンパス, 松山
  • Year and Date: 2015-09-26
• [Presentation] Effects of temporal variation in tide-induced vertical mixing on the thermohaline circulation: A case of the Okhotsk Sea (2015)
  • Author(s): Nakamura,T., Y. Takeuchi, K. Uchimoto, H. Mitsuderea, M. Wakatsuchi
  • Organizer: 26th IUGG General Assembly 2015
  • Place of Presentation: Prague Congress Centre, Prague, Czech Republic
  • Year and Date: 2015-06-22
  • Int'l Joint Research
• [Presentation] Vortex-internal waves interaction in quasi-linear and nonlinear regimes (2015)
  • Author(s): Ito, K. and T. Nakamura
  • Organizer: 26th IUGG General Assembly 2015
  • Place of Presentation: Prague Congress Centre, Prague, Czech Republic
  • Year and Date: 2015-06-22
  • Int'l Joint Research
• [Presentation] An Unstable Mode Formed by Combination of Kelvin-Helmholtz Waves and Tollmien-Schlichiting Waves in Jets on the Bottom (2014)
  • Author(s): Abe, S., T. Nakamura, H. Mitsudera
  • Organizer: American Geophysical Union (AGU)
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2014-12-15 – 2014-12-19
• [Presentation] 北太平洋物質循環モデルの結合～鉄-栄養塩実験～ (2014)
  • Author(s): 中野渡拓也, 吉成浩志, 内本圭亮, 松田淳二, 三寺史夫, 中村知裕, 西岡純, 津旨大輔, 三角和弘, 羽角博康, 若土正曉
  • Organizer: 2014年度 日本海洋学会 秋季大会
  • Place of Presentation: 長崎大学文教キャンパス, 長崎
  • Year and Date: 2014-09-13 – 2014-09-17
• [Presentation] Unstable Modes of Jets on the Bottom (2014)
  • Author(s): Abe, S., T. Nakamura, H. Mitsudera
  • Organizer: Asia Oceania Geosciences Society (AOGS)
  • Place of Presentation: Royton Sapporo Hotel, Sapporo, Japan
  • Year and Date: 2014-07-28 – 2014-08-01
• [Presentation] Overturning circulation ventilating the intermediate layer of the Sea of Okhotsk and the North Pacific: the role of salinity advection (2014)
  • Author(s): Matsuda, J., H. Mitsudera, T. Nakamura, H. Hasumi, M. Wakatsuchi
  • Organizer: Asia Oceania Geosciences Society (AOGS)
  • Place of Presentation: Royton Sapporo Hotel, Sapporo, Japan
  • Year and Date: 2014-07-28 – 2014-08-01
• [Presentation] Seasonal variability of dissolved iron in the western subarctic North Pacific: Importance of lateral advection processes (2014)
  • Author(s): Nakanowatari, T., K. Uchimoto, T. Nakamura, J. Nishioka, H. Mitsudera, M. Wakatsuchi
  • Organizer: Asia Oceania Geosciences Society (AOGS)
  • Place of Presentation: Royton Sapporo Hotel, Sapporo, Japan
  • Year and Date: 2014-07-28 – 2014-08-01
• [Presentation] 海底上ジェットの不安定 (2014)
  • Author(s): 阿部祥子,中村知裕,三寺史夫
  • Organizer: 2014年度日本海洋学会春季大会
  • Place of Presentation: 東京海洋大学品川キャンパス, 東京
• [Presentation] Vortex and internal waves interactions (2014)
  • Author(s): Ito, K. and T. Nakamura
  • Organizer: 2014 Ocean Sciences Meeting
  • Place of Presentation: Hawaii Convention Center, Honolulu, Hawaii, USA
• [Presentation] Remotely propagating salinity anomaly varies the source of the North Pacific ventilation (2014)
  • Author(s): Uehara, H., Kruts, A. A., Mitsudera, H., Nakamura, T., and Volkov, Y. N.
  • Organizer: 2014 Ocean Sciences Meeting
  • Place of Presentation: Hawaii Convention Center, Honolulu, Hawaii, USA
• [Presentation] Thermohaline circulation system from the Bering Sea to the North Pacific via the Sea of Okhotsk (2014)
  • Author(s): Matsuda, J., Mitsudera, H., Nakamura, T., Hasumi, H., and Sasajima, Y
  • Organizer: 2014 Ocean Sciences Meeting
  • Place of Presentation: Hawaii Convention Center, Honolulu, Hawaii, USA
• [Presentation] 内部波の許容から解像へ、そして砕波過程の解像へ (2013)
  • Author(s): 中村知裕
  • Organizer: 2013年度日本海洋学会秋季大会
  • Place of Presentation: 北海道大学, 札幌
  • Invited
• [Presentation] 渦と内部波の相互作用 (2013)
  • Author(s): 伊藤薫,中村知裕
  • Organizer: 2013年度日本海洋学会秋季大会
  • Place of Presentation: 北海道大学, 札幌
• [Presentation] 高解像度モデルによって見えてきたオホーツク海熱塩循環システムの描像 (2013)
  • Author(s): 松田淳二,笹島雄一郎,三寺史夫,中村知裕,羽角博康,若土正曉
  • Organizer: 2013年度日本海洋学会秋季大会
  • Place of Presentation: 北海道大学, 札幌
• [Book] 低温科学便覧（北海道大学低温科学研究所編）, 第8章, 第2節 (2015)
  • Author(s): 中村知裕
  • Publisher: 丸善出版株式会社