Study on dynamics of deep ocean currents above slopes and its parameterization

• Project/Area Number: 19540456
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: The University of Tokyo
• Principal Investigator: FUJIO Shinzou The University of Tokyo, 海洋研究所, 准教授 (00242173)
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2008: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2007: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
• Keywords: 海洋物理学 / 地球流体力学 / 深層流 / 海溝 / 変動流 / 海洋物理

Research Abstract

Strong deep currents exist above the slopes of trenches around Japan. Their causes are investigated using layer models with high resolution bottom topography. Deep upwelling generates anticyclonic circulations within trenches, but it is quite weaker than the deep currents originating from the South Pacific. Fluctuating wind generates fluctuating deep currents that have similar spectra to the observation at the Japan Trench. Conversion from eddy to mean flows occurs along continental shelves but not along trenches. One reason is that the magnitude of fluctuation in the model is only a fifth of the observation.

Research Products

• [Journal Article] Pacific Ocean circulation based on observation (2010)
  • Author(s): Kawabe, M., S. Fujio
  • Journal Title: Journal of Oceanography Vol. 66 Pages: 389-403
  • NAID: 10029033074
  • Peer Reviewed
• [Journal Article] Direct velocity measurements of deep circulation southwest of the Shatsky Rise in the western North Pacific (2010)
  • Author(s): Yanagimoto, D., M. Kawabe, S. Fujio
  • Journal Title: Deep-Sea Research I Vol. 57 Pages: 328-337
  • Peer Reviewed
• [Journal Article] Direct velocity measurements of deep circulation southwest of the Shatsky Rise in the western North Pacific (2010)
  • Author(s): Yanagimoto, D., M.Kawabe, S.Fujio
  • Journal Title: Deep-Sea Research I 57 Pages: 328-337
  • Peer Reviewed
• [Journal Article] Pacific Ocean circulation based on observation (2010)
  • Author(s): Kawabe, M., S.Fujio
  • Journal Title: Journal of Oceanography 66 Pages: 389-403
  • NAID: 10029033074
  • Peer Reviewed
• [Journal Article] Water masses and currents of deep circulation southwest of the Shatsky (2009)
  • Author(s): Kawabe, M., S. Fujio, D. Yanagimoto, K. Tanaka
  • Journal Title: Deep-Sea Research I Vol. 56 Pages: 1675-1687
  • Peer Reviewed
• [Journal Article] Water masses and currents of deep circulation southwest of the Shatsky Rise in the western North Pacific (2009)
  • Author(s): Kawabe, M., S.Fujio, D.Yanagimoto, K.Tanaka
  • Journal Title: Deep-Sea Research I 56 Pages: 1675-1687
  • Peer Reviewed
• [Presentation] CTDとLADCPによる鉛直拡散係数の推定 (2009)
  • Author(s): 藤尾伸三・川辺正樹
  • Organizer: 日本海洋学会春季大会
  • Place of Presentation: 東京都・品川
  • Year and Date: 2009-04-08
• [Presentation] CTDとLADCPによる鉛直拡散係数の推定 (2009)
  • Author(s): 藤尾伸三・川辺正樹
  • Organizer: 日本海洋学会春季大会
  • Place of Presentation: 東京海洋大学(東京都)
  • Year and Date: 2009-04-08
• [Presentation] 日本海溝周辺における深層流の時間変動 (2008)
  • Author(s): 藤尾伸三, 柳本大吾, 北川庄司
  • Organizer: 日本海洋学会秋季大会
  • Place of Presentation: 広島県・呉
  • Year and Date: 2008-09-27
• [Presentation] 日本海溝周辺における深層流の時間変動 (2008)
  • Author(s): 藤尾伸三,柳本大吾,北川庄司
  • Organizer: 日本海洋学会秋季大会
  • Place of Presentation: 呉,日本
  • Year and Date: 2008-09-27
• [Presentation] LADCP反射強度データの水塊分析への利用 (2007)
  • Author(s): 小牧加奈絵・川辺正樹・藤尾伸三
  • Organizer: 日本海洋学会秋季大会
  • Place of Presentation: 沖縄県・那覇
  • Year and Date: 2007-09-28
• [Presentation] LADCP反射強度データの水塊分析への利用 (2007)
  • Author(s): 小牧加奈絵・川辺正樹・藤尾伸三
  • Organizer: 日本海洋学会秋季大会
  • Place of Presentation: 沖縄県・琉球大学
  • Year and Date: 2007-09-28