A study on mean features and variability of meandering and ring formations in the Kuroshio Extension and Gulf Stream regions

• Project/Area Number: 25800258
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Hokkaido University
• Principal Investigator: Sasaki Yoshinori 北海道大学, 理学(系)研究科(研究院), 講師 (50604815)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 海洋物理・陸水学 / 気候変動 / 海洋ジェット / 黒潮続流 / メキシコ湾流

Outline of Final Research Achievements

A new method that consists of the detection of the jet path changes and the tracking of a mesoscale eddy is proposed to objectively capture eddy shedding from an oceanic jet based on sea surface height data. This method is applied to the Kuroshio Extension and Gulf Stream jets. Based on these results, it is revealed that the pinched-off mesoscale eddies play an important role in across-jet transports of heat and nutrients. In addition, the fluctuations of the eddy formation are negatively correlated with the strength of the jets, suggesting deceleration of the jets by eddy formation.

Research Products

• [Journal Article] 西岸境界流およびその続流の変動に関する理論的・解析的研究 (2016)
  • Author(s): 佐々木克徳
  • Journal Title: 海の研究 Volume: 25 Pages: 1-16
  • Peer Reviewed / Open Access
• [Journal Article] Climatological mean features and interannual to decadal variability of ring formations in the Kuroshio Extension region (2015)
  • Author(s): Sasaki, Y. N., and S. Minobe
  • Journal Title: Journal of Oceanography Volume: 未定 Issue: 5 Pages: 499-509
  • DOI: 10.1007/s10872-014-0270-4
  • 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] Decadal sea level variability along the coast of Japan in response to ocean circulation changes (2014)
  • Author(s): Y. N. Sasaki, S. Minobe and Y. Miura
  • Journal Title: Journal of Geophysical Research: Oceans Volume: 119 Issue: 1 Pages: 266-275
  • DOI: 10.1002/2013jc009327
  • NAID: 120005457011
  • Peer Reviewed
• [Presentation] Interannual variability of ring formations in the Gulf Stream region (2016)
  • Author(s): Sasaki, Y. N.
  • Organizer: Ocean Sciences Meeting 2016
  • Place of Presentation: New Orleans (USA)
  • Year and Date: 2016-02-22
  • Int'l Joint Research
• [Presentation] Decadal variability of the Kuroshio Extension jet and its relation to coastal sea level along Japan (2016)
  • Author(s): Sasaki, Y. N., S. Minobe, Y. Miura, and N. Schneider
  • Organizer: CLIVAR/JAMSTEC Workshop on the Kuroshio Current and Extension System
  • Place of Presentation: JAMSTEC横浜研究所(神奈川県横浜市)
  • Year and Date: 2016-01-12
  • Int'l Joint Research
• [Presentation] Decadal variability of the Kuroshio Extension jet and its relation to coastal sea level along Japan (2015)
  • Author(s): Sasaki, Y. N., S. Minobe, Y. Miura, and N. Schneider
  • Organizer: The 2nd Open Science Symposium on Western Pacific Ocean Circulation and Climate
  • Place of Presentation: Busan (Korea)
  • Year and Date: 2015-10-26
  • Int'l Joint Research
• [Presentation] 西岸境界流およびその続流の変動に関する理論的・解析的研究 (2015)
  • Author(s): 佐々木克徳
  • Organizer: 2015年度日本海洋学会春季大会
  • Place of Presentation: 東京海洋大学(東京都港区)
  • Year and Date: 2015-03-23
• [Presentation] Climatological mean features and interannual to decadal variability of ring formations in the Kuroshio Extension region (2014)
  • Author(s): Sasaki, Y. N., and S. Minobe
  • Organizer: 2014 AGU Fall Meeting
  • Place of Presentation: The Moscone Center (USA)
  • Year and Date: 2014-12-18
• [Presentation] Decadal sea level variability along the coast of Japan in response to ocean circulation changes (2014)
  • Author(s): Sasaki, Y. N., S. Minobe, and Y. Miura
  • Organizer: Asia Oceania Geosciences Society 2014
  • Place of Presentation: ロイトン札幌(北海道)
  • Year and Date: 2014-07-31
• [Presentation] Regional influence of basin-scale wind stress variability via jet-trapped Rossby waves in the western North Pacific (2013)
  • Author(s): Minobe, S., Y. N. Sasaki, Y. Miura, and N. Schneider
  • Organizer: Second Regional Climate Modeling Workshop
  • Place of Presentation: Novotel Ambassador Busan (韓国)
  • Invited
• [Presentation] 日本沿岸の海面高度変動に対するロスビー波の影響
  • Author(s): 佐々木 克徳，見延 庄士郎，三浦 優司
  • Organizer: 2014年度日本海洋学会春季大会
  • Place of Presentation: 東京海洋大学(東京都)
• [Presentation] Decadal sea level variability along the coast of Japan in response to ocean circulation changes
  • Author(s): Sasaki, Y. N., S. Minobe, and Y. Miura
  • Organizer: Ocean Sciences Meeting 2014
  • Place of Presentation: Honolulu convention center (アメリカ)
• [Remarks]
  • URL: http://www.sci.hokudai.ac.jp/~sasakiyo/
• [Remarks] sealevelJP.pdf
  • URL: http://www.sci.hokudai.ac.jp/~sasakiyo/sealevelJP.pdf