Exploration of deep mesoscale variabiilty by high-density mooring observation

• Project/Area Number: 26610149
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: The University of Tokyo
• Principal Investigator: Oka Eitarou 東京大学, 大気海洋研究所, 准教授 (60360749)
• Co-Investigator(Renkei-kenkyūsha): YANAGIMOTO Daigo 東京大学, 大気海洋研究所, 助教 (40260517) ; FUJIO Shinzo 東京大学, 大気海洋研究所, 准教授 (00242173) ; HASUMI Hiroyasu 東京大学, 大気海洋研究所, 教授 (40311641)
• Research Collaborator: MIYAMOTO Masatoshi
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000); Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 海洋深層 / 中規模変動 / 係留観測 / 地形性ロスビー波 / 深層循環

Outline of Final Research Achievements

To clarify the characteristics and mechanism of mesoscale variability in deep layers of the ocean, we conducted high-resolution mooring observation around Station B (30N, 147E) from May 2014 to October 2015. We recovered seven out of nine moorings deployed in a 3x3 shape, and analyzed the obtained data together with mooring observation data in the 1970-80s around St. B as well as output from an eddy-resolving ocean general circulation model. At Station B, mesoscale variabilities with a period of about 60 and 170 days were propagating northwestward and west-southwestward, respectively as plane waves. Based on the estimated wave number vector and vertical structure, these variabilities were judged to be topographic Rossby waves originated in the Kuroshio Extension region and the Shatsky rise.

Research Products

• [Journal Article] Characteristics and mechanism of deep mesoscale variability south of the Kuroshio Extension (2017)
  • Author(s): Miyamoto Masatoshi、Oka Eitarou、Yanagimoto Daigo、Fujio Shinzou、Mizuta Genta、Imawaki Shiro、Kurogi Masao、Hasumi Hiroyasu
  • Journal Title: Deep Sea Research I Volume: 123 Pages: 110-117
  • DOI: 10.1016/j.dsr.2017.04.003
  • Peer Reviewed
• [Presentation] Mesoscale variability of deep currents in the Northwest Pacific Basin (2018)
  • Author(s): Miyamoto M., E. Oka, D. Yanagimoto, S. Fujio, G. Mizuta, S. Imawaki, M. Kurogi, H. Hasumi, and M. Nagasawa
  • Organizer: Ocean Sciences Meeting 2018
  • Int'l Joint Research
• [Presentation] Characteristics and mechanism of deep mesoscale variability observed by high-resolution mooring observations (2017)
  • Author(s): Miyamoto M., E. Oka, D. Yanagimoto, S. Fujio, G. Mizuta, and M. Nagasawa
  • Organizer: Meeting on Perspectives in Computational Atmosphere and Ocean Science and OFES International Workshop
  • Place of Presentation: 名古屋大学（愛知県名古屋市）
  • Year and Date: 2017-03-13
  • Int'l Joint Research
• [Presentation] Mesoscale variability of deep currents in the Northwest Pacific Basin (2017)
  • Author(s): Miyamoto M., E. Oka, D. Yanagimoto, S. Fujio, G. Mizuta, S. Imawaki, M. Kurogi, H. Hasumi, and M. Nagasawa
  • Organizer: University of Tokyo and University of Hawaii, Joint Symposium on Ocean, Coastal, and Atmospheric Sciences
  • Int'l Joint Research
• [Presentation] 北西太平洋海盆における深層流の半年周期変動 (2017)
  • Author(s): 宮本雅俊，岡英太郎，柳本大吾，藤尾伸三，水田元太，今脇資郎，黒木聖夫，羽角博康，長澤真樹
  • Organizer: 2017年度日本海洋学会秋季大会
• [Presentation] 北西太平洋海盆における深層流の半年周期変動 (2017)
  • Author(s): 宮本雅俊，岡英太郎，柳本大吾，藤尾伸三，水田元太，今脇資郎，黒木聖夫，羽角博康，長澤真樹
  • Organizer: 海洋大循環の力学 -- エクマン層から中深層循環まで研究会
• [Presentation] Mesoscale variability of deep currents in Northwest Pacific Basin (2016)
  • Author(s): Miyamoto M., E. Oka, D. Yanagimoto, S. Fujio, M. Kurogi, and H. Hasumi,
  • Organizer: AORI-SIO Symposium for Building Strategic Partnership
  • Place of Presentation: ラホヤ（米国）
  • Year and Date: 2016-10-04
  • Int'l Joint Research
• [Presentation] KH-16-3次航海における深層のCTD・係留観測 (2016)
  • Author(s): 宮本雅俊，岡英太郎，柳本大吾，藤尾伸三，長澤真樹
  • Organizer: 2016年大気海洋相互作用研究会
  • Place of Presentation: 東海大学セミナーハウス（山梨県山中湖村）
  • Year and Date: 2016-07-21
• [Presentation] Mesoscale variability of deep currents south of the Kuroshio Extension (2016)
  • Author(s): Miyamoto M., E. Oka, D. Yanagimoto, S. Fujio, M. Kurogi, and H. Hasumi
  • Organizer: CLIVER/JAMSTEC Workshop on the Kuroshio Current and Extension System: Theory, Observations, and Ocean Climate Modelling
  • Place of Presentation: JAMSTEC, Yokohama
  • Year and Date: 2016-01-12
  • Int'l Joint Research
• [Presentation] 黒潮続流南方海域における深層流の中規模変動 (2015)
  • Author(s): 宮本雅俊，岡英太郎，柳本大吾，藤尾伸三，黒木聖夫，羽角博康
  • Organizer: 九州大学応用力学研究所共同利用研究会「海洋大循環の力学--エクマン層から中深層まで」
  • Place of Presentation: 九州地区国立大学島原共同研修センター, 島原
  • Year and Date: 2015-11-06
• [Presentation] 黒潮続流南方海域における深層流の中規模変動 (2015)
  • Author(s): 宮本雅俊，岡英太郎，柳本大吾，藤尾伸三，黒木聖夫，羽角博康
  • Organizer: 日本海洋学会2015年度秋季大会
  • Place of Presentation: 愛媛大学, 松山
  • Year and Date: 2015-09-27
• [Presentation] Mesoscale variability of deep currents south of the Kuroshio Extension (2015)
  • Author(s): Miyamoto M., E. Oka, D. Yanagimoto, S. Fujio, M. Kurogi, and H. Hasumi
  • Organizer: Sustained ocean observing for the next decade, A combined GO-SHIP/Argo/ IOCCP conference on physical and biogeochemical measurements of the water column
  • Place of Presentation: Galway, Ireland
  • Year and Date: 2015-09-15
  • Int'l Joint Research
• [Presentation] 黒潮続流南方海域における深層流の中規模変動 (2015)
  • Author(s): 宮本雅俊，岡英太郎，柳本大吾，藤尾伸三，黒木聖夫，羽角博康
  • Organizer: 大気海洋相互作用研究会
  • Place of Presentation: 東海大学山中湖セミナーハウス、山梨県山中湖村
  • Year and Date: 2015-06-20
• [Presentation] Mesoscale variability of deep currents in Northwest Pacific Basin (2015)
  • Author(s): Miyamoto M., E. Oka, D. Yanagimoto, S. Fujio, M. Kurogi and H. Hasumi
  • Organizer: University of Tokyo and University of Hawaii The 3rd Joint Symposium on Ocean, Coastal, and Atmospheric Sciences
  • Place of Presentation: 東京大学大気海洋研究所、柏
  • Year and Date: 2015-03-11
• [Presentation] Mesoscale variability of deep currents in Northwest Pacific Basin (2014)
  • Author(s): Miyamoto M., E. Oka, D. Yanagimoto, S. Fujio, M. Kurogi and H. Hasumi
  • Organizer: 2014 AGU Fall Meeting
  • Place of Presentation: サンフランシスコ、米国
  • Year and Date: 2014-12-18
• [Presentation] 北西太平洋海盆における深層流の中規模変動 (2014)
  • Author(s): 宮本雅俊，岡英太郎，柳本大吾，藤尾伸三，黒木聖夫，羽角博康
  • Organizer: 東京大学大気海洋研究所共同利用研究集会「地球流体のおける流れの多様性と普遍性の力学」
  • Place of Presentation: 東京大学大気海洋研究所、柏
  • Year and Date: 2014-11-21
• [Presentation] 北西太平洋海盆における深層流の中規模変動 (2014)
  • Author(s): 宮本雅俊，岡英太郎，柳本大吾，藤尾伸三，黒木聖夫，羽角博康
  • Organizer: 九州大学応用力学研究所共同利用研究会「海洋大循環の力学 -- エクマン層から中深層まで」
  • Place of Presentation: 九州地区国立大学九重共同研修所、九重
  • Year and Date: 2014-11-01
• [Presentation] 高密度係留観測に基づく海洋深層の中規模現象の解明 ―KS-14-7航海の目的と速報― (2014)
  • Author(s): 宮本雅俊，岡英太郎，柳本大吾，藤尾伸三，羽角博康
  • Organizer: 東京大学大気海洋研究所共同利用研究集会「海洋物理船舶観測フェスタ2014」
  • Place of Presentation: 東京大学大気海洋研究所、柏
  • Year and Date: 2014-05-30
• [Remarks] 新青丸KS-14-7次航海
  • URL: http://ocg.aori.u-tokyo.ac.jp/member/eoka/cruises/ks-14-7/index-jp.html
• [Remarks] 新青丸KS-15-14次航海
  • URL: http://ocg.aori.u-tokyo.ac.jp/member/eoka/cruises/ks-15-14/index-jp.html
• [Remarks] 白鳳丸KH-16-3次航海
  • URL: http://ocg.aori.u-tokyo.ac.jp/member/eoka/cruises/kh-16-3/index-jp.html
• [Remarks] 新青丸KS-14-7次航海
  • URL: http://ocg.aori.u-tokyo.ac.jp/member/eoka/ks-14-7/index-jp.html
• [Remarks] 新青丸KS-15-14次航海
  • URL: http://ocg.aori.u-tokyo.ac.jp/member/eoka/ks-15-14/index-jp.html
• [Remarks] 学術研究船新青丸KS-14-7次研究航海
  • URL: http://ocg.aori.u-tokyo.ac.jp/member/eoka/ks-14-7/index-jp.html