Direct observations of tidal mixing and studies on ocean/climate variability synchronized with 18.6-year period nodal tidal cycle

2012 Fiscal Year Final Research Report

• Project/Area Number: 20221002
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Environmental dynamic analysis
• Research Institution: The University of Tokyo
• Principal Investigator: YASUDA Ichiro 東京大学, 大気海洋研究所, 教授 (80270792)
• Co-Investigator(Kenkyū-buntansha): HASUMI Hiroyasu 東京大学, 大気海洋研究所, 教授 (40311641) ; KOMATSU Kosei 東京大学, 新領域創成科学研究科, 准教授 (30371834) ; NISHIOKA Jun 北海道大学, 低温科学研究所, 准教授 (90371533) ; WATANABE Yutaka 北海道大学, 地球環境科学院, 准教授 (90333640) ; NAKATSUKA Takeshi 名古屋大学, 環境学研究科, 教授 (60242880)
• Co-Investigator(Renkei-kenkyūsha): ITOH Sachihiko 東京大学, 大気海洋研究所, 准教授 (80345058) ; TATEBE Hiroaki 海洋研究開発機構, 地球環境変動領域, 研究員 (40466876) ; KATSUMATA Katsurou 海洋研究開発機構, 地球環境観測センター, 主任研究員 (80450774) ; NAKAMURA Tomohiro 北海道大学, 低温科学研究所, 講師 (60400008) ; HIROE Yutaka 水産総合研究センター, 中央水産研究所, 主任研究員 (20371833) ; OSAFUNE Satoshi 東京大学, 大気海洋研究所, 機関研究員 (50638723) ; TANAKA Yuki 東京大学, 大気海洋研究所, 特任研究員 (80632380) ; IKEYA Tohru 東京大学, 大気海洋研究所, 特任研究員 (70361590) ; NISHIKAWA Haruka 東京大学, 大気海洋研究所, 特任研究員 (10625396) ; TOMOSADA Akira 東京大学, 大気海洋研究所, 特任研究員
• Project Period (FY): 2008 – 2012
• Keywords: 潮汐鉛直混合 / 長期大気海洋変動 / 海洋物質循環 / 海洋生態系

Research Abstract

Intense tide-induced turbulent mixing that reached deep ocean around the Kuril or Aleutian Straits was observationally evidenced. This strong vertical mixing affects marine ecosystem in the subarctic North Pacific through circulations of nutrients such as iron. Furthermore, observations and climate model experiments revealed that oceanic variations originated from the 18.6-year period modulation of the tidal mixing in those regions are amplified by air-sea interactions such as SST east of Japan and the Aleutian Low Pressure system and regulate bi-decadal climate and ocean variations.

Research Products

• [Journal Article] Remote impacts of the 18.6-year period modulation oflocalized tidal mixing in the North Pacific (2013)
  • Author(s): S. Osafune and I. Yasuda
  • Journal Title: J. Geophys. Res Volume: (in press)
• [Journal Article] Intensive mixing along an Island chain controls oceanic biogeochemical cycles (2013)
  • Author(s): J. Nishioka, T. Nakatsuka, Y.W. Watanabe, I. Ya suda, K. Kuma, H. Ogawa, N. Ebuchi, A. Scherbinin, Yu. N. Volkov, T. Shiraiwa, M.Wakatsuchi
  • Journal Title: Global Biogeochemical Cycle Volume: (in press)
• [Journal Article] Winter mixed layer depth and spring bloom along the Kuroshio front: implications for feeding environment and recruitment of Japanese sardine (2013)
  • Author(s): H. Nishikawa, I. Ya suda, K. Komatsu, H. Sasaki, Y. Sasai, T. Setou and M. Shimizu
  • Journal Title: Marine Ecology Pregress Series Volume: (in press)
• [Journal Article] Decadal time evolution of ocean uptake of anthropogenic carbon in the Okhotsk Sea (2013)
  • Author(s): Watanabe Y. W., J. Nishioka and T. Nakatsuka
  • Journal Title: Geophysical Research Letter Volume: 40 Pages: 1-5
  • DOI: doi:10.1002/grl.50113
• [Journal Article] A method for estimating vertical profiles of turbulent dissipation rate using density inversions in the Kuril Straits (2013)
  • Author(s): M. Yagi and I. Ya suda
  • Journal Title: J. Oceanogr. Volume: 69 Pages: 203-214
  • DOI: DOI10.1007/s10872-012-0165-1
• [Journal Article] Effects of the 18.6-year modulation of tidal mixing on the North Pacific bidecadal climate variability in a coupled climate model (2012)
  • Author(s): Tanaka, Y., I. Ya suda, H. Hasumi, H. Tatebe, and S. Osafune
  • Journal Title: Journal of Climate Volume: 25 Pages: 7625-7642
  • DOI: DOI:10.1175/JCLI-D-12-00051.1
• [Journal Article] Observations of the structure of turbulent mixing across the Kuroshio (2012)
  • Author(s): Kaneko, H., I. Ya suda, K. Komatsu, and S. Itoh
  • Journal Title: GEOPHYSICAL RESEARCH LETTERS Volume: VOL.39 Pages: L15602
  • DOI: doi:10.1029/2012GL052419
• [Journal Article] Deep intense vertical mixing in the Bussol' Strait (2012)
  • Author(s): M. Yagi and I. Ya suda
  • Journal Title: Geophys. Res. Letters Volume: 39 Pages: L01602
  • DOI: doi:10.1029/2011GL050349
• [Journal Article] Studies on the formation, transport and modification of North Pacific Intermediate Water (2012)
  • Author(s): Yasuda, I.
  • Journal Title: Oceanography in Japan Volume: 21(2) Pages: 83-99
• [Journal Article] Numerical study on the impact of the 18.6-year period nodaltidal cycle on water-masses in the subarctic North Pacific (2012)
  • Author(s): S. Osafune and I. Ya suda
  • Journal Title: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Volume: 117 Pages: C05009
  • DOI: DOI:10.1029/2011JC007734
• [Journal Article] Turbulent iron flux sustains Green Belt along the shelf break in the southeastern Bering Sea (2012)
  • Author(s): T. Tanaka, I. Ya suda, K. Kuma and J. Nishioka
  • Journal Title: GEOPHYSICAL RESEARCH LETTERS Volume: 39 Pages: L08603
  • DOI: DOI:10.1029/2012GL051164
• [Journal Article] Long-term variability of winter mixed layer depth and temperature along the Kuroshio jet in a high-resolution ocean general circulation model (2011)
  • Author(s): H. Nishikawa and I. Ya suda
  • Journal Title: J. Oceanogr Volume: 67(4) Pages: 503-518
  • DOI: DOI:10.1007/s10872-011-0053-0
• [Journal Article] Strong vertical mixing in the Urup Strait, Geophys (2011)
  • Author(s): S. Itoh, I. Ya suda, M. Yagi, H. Kaneko, S. Osafune, T. Nakatsuka J. Nishioka, and Y. N. Volkov
  • Journal Title: Res. Letters Volume: VOL. 38 Pages: L16607
  • DOI: doi:10.1029/2011GL048507
• [Journal Article] Impact of winter-to-spring environmental variability along the Kuroshio jet on the recruitment of Japanese sardine (Sardinops melanostictus) (2011)
  • Author(s): H. NISHIKAWA, I. YA SUDA, and S. ITOH
  • Journal Title: Fish. Oceanogr. Volume: 20(6) Pages: 570-582
  • DOI: DOI:10.1111/j.1365-2419.2011.00603.x
• [Journal Article] Oceanic iron supply mechanisms which support the spring diatom bloom in the Oyashio region, western subarctic Pacific (2011)
  • Author(s): J. Nishioka, T. Ono, H. Saito, K. Sakaoka, and T. Yoshimura
  • Journal Title: JOURNAL OF GEOPHYSICAL RESEARCH Volume: 116 Pages: C02021
  • DOI: doi:10.1029/2010JC006321
• [Journal Article] Recent change in the oceanic uptake rate of anthropogenic carbon in the North Pacific subpolar region determined by using a 13C time series (2011)
  • Author(s): Watanabe, Y. W., Chiba, T, Tanaka, T
  • Journal Title: Accepted in Journal of Geophysical Research Volume: 116 Pages: C02006
  • DOI: doi:10.1029/2010JC006199.
• [Journal Article] Horizontal transport of the calanoid copepod Neocalanus in the North Pacific: The influences of the current system and the life history (2010)
  • Author(s): H. Tatebe, I. Yasuda, H. Saito and Y. Shimizu
  • Journal Title: Deep-Sea Res. I Volume: 57 Pages: 409-419
  • DOI: DOI:10.1016/j.dsr.2009.11.009
• [Journal Article] Estimate of non-tidal exchange transport between the Sea of Okhotsk and the North Pacific (2010)
  • Author(s): K. Katsumata and I. Yasuda
  • Journal Title: J. Oceanogr. Volume: 66 Pages: 489-504
• [Journal Article] Fine- and microstructure observations in the Urup Strait, Kuril Islands, during August of 2006 (2010)
  • Author(s): S. Itoh, I. Yasuda, T. Nakatsuka J. Nishioka, and Y. N. Volkov
  • Journal Title: J. Geophys. Res. Oceans Volume: 115 Pages: C08004
  • DOI: doi:10.1029/2009JC005629
• [Journal Article] Bidecadal variability in the Bering Sea and the relation with 18.6year perioid nodal tidal cycle (2010)
  • Author(s): S. Osafune, and I. Yasuda
  • Journal Title: J. Geophys. Res. Volume: 115
  • DOI: DOI:10.1029/2008JC005110.
• [Journal Article] Breaking of unsteady lee waves generated by diurnal tides (2010)
  • Author(s): Nakamura T., Y. Isoda, H. Mitsudera, S. Takagi, M. Nagasawa
  • Journal Title: Geophys. Res. Lett. Volume: 37 Pages: L04602
  • DOI: doi:10.1029/2009GL041456
• [Journal Article] Numerical study of K〓 internal tides in the Kuril straits (2010)
  • Author(s): Tanaka, Y., T. Hibiya, Y. Niwa, and N. Iwamae
  • Journal Title: J. Geophys. Res. Volume: 115 Pages: C09016
  • DOI: doi:10.1029/2009JC005903.
• [Journal Article] Assessment of the Effects of Tidal Mixing in the Kuril Straits on the Formation of the North Pacific Intermediate Water (2010)
  • Author(s): Tanaka, Y., T. Hibiya, and Y. Niwa
  • Journal Title: J. Phys. Oceanogr. Volume: 40 Pages: 2569-2574
  • DOI: DOI:10.1175/2010JPO4506.1
• [Journal Article] Possible mechanisms of decadal scale variations in PO4 concentration in the Oyashio and Kuroshio-Oyashio Transition waters, western North Pacific (2009)
  • Author(s): K. Tadokoro, T. Ono, I. Yasuda, S. Osafune, A. Shiomoto and H. Sugisaki
  • Journal Title: GEOPHYSICAL RESEARCH LETTERS Volume Volume: 36
  • DOI: DOI:10.1029/2009GL037327
• [Journal Article] The 18.6-year period moon-tidal cycle in Pacific Decadal Oscillation reconstructed from tree-rings in western North America, Geophys (2009)
  • Author(s): Yasuda, I
  • Journal Title: Res. Lett. Volume: 36 Pages: L05605
  • DOI: doi:10.1029/2008GL036880.
• [Journal Article] Increases of alkalinity and pH in the Okhotsk Sea during the1990s and 2000s (2009)
  • Author(s): Watanabe, Y. W., J. Nishioka, M. Shigemitsu, A. Mimura and T. Nakatsuka
  • Journal Title: Geophysical Research Letter Volume: 36 Pages: 15
  • DOI: doi:10.1029/2009GL038520.
• [Journal Article] Pacific bidecadal variability regulated by tidal mixing around the Kuril Islands (2008)
  • Author(s): H. Hasumi, I. Ya suda and H. Tatebe, M. Kimoto
  • Journal Title: Geophysical Research Letters Volume: 35 Pages: L14601
  • DOI: doi:10.1029/2008GL034406,2008
• [Journal Article] Influence of riverine alkalinity on carbon species in the Okhotsk Sea
  • Author(s): Watanabe, Y. W., Nishioka, J., Shigemitsu, M., Mimura, A. and Nakatsuka, T.
  • Journal Title: Geophys. Res. Lett Volume: 36(15) Pages: L15604
  • DOI: doi:10.1029/2009GL038672
• [Presentation] Interactions between fisheries production, planktonic ecosystems, physicaloceanographic processes and climate change (2012)
  • Author(s): Yasuda, I
  • Organizer: Plenary Talk at Second International Symposium on "Effects of climate change on the world's oceans" in Yeosu Korea
  • Year and Date: 2012-05-18
• [Presentation] NIOZ colocium (2011)
  • Author(s): Jun Nishioka
  • Organizer: The annual cycle of surface iron and the source or iron supporting the spring diatom bloom in the Oyashio region
  • Place of Presentation: Western subarctic Pacific
  • Year and Date: 2011-11-18
• [Presentation] Development of tree-ring cellulose oxygen isotope chronologies in Asia and Japan : theoretical and technical backgrounds and their applications (2011)
  • Author(s): Takeshi NAKATSUKA, Masaki SANO, Qiang LI, Chenxi XU, Kota TAKANO, Kimitaka KAWAMURA, Akira KAGAWA, Koh YASUE and Takumi MITSUTANI
  • Organizer: 2nd Conference of Asian Dendrochronological Association
  • Place of Presentation: Xi'an, China
  • Year and Date: 2011-08-20
• [Presentation] 18.6-year period moon-tidal cycle and North Pacific ocean-climate variability (2009)
  • Author(s): Yasuda, I
  • Organizer: J09-IAPSO/IAMAS MOCA09
  • Place of Presentation: Montreal
  • Year and Date: 2009-07-22
• [Book] 生物地球化学過程に果たす環オホーツク圏の海洋循環・物質循環の役割-総説- (2012)
  • Author(s): 西岡純
  • Total Pages: 552-560
  • Publisher: 月刊海洋
• [Book] 総論:潮汐混合とオホーツク海・ベーリング海の物理・化学・生物過程 (2011)
  • Author(s): 安田一郎
  • Total Pages: 629-640
  • Publisher: 月刊海洋
• [Book] 総論:潮汐混合とオホーツク海・ベーリング海の物理・化学・生物過程 (2008)
  • Author(s): 安田一郎
  • Total Pages: 5-15
  • Publisher: 月刊海洋号外
• [Remarks]
  • URL: http://lmr.aori.u-tokyo.ac.jp/feog/186.html