Japan Sea National Fisheries Research Institute

Senior Researcher
Physical Oceanography Group

Office: Suido-cho 1-5939-22, Chuou-ku, Niigata 951-8121, Japan
Tel: +81-25-228-0616
Fax: +81-25-223-7425
E-mail: adress

 


Japanese  English    

Taku WAGAWA

|| Born
  • September 1981, in Miyagi Pref., Japan

|| Degree & Research experience
  • Senior Researcher, Japan Sea National Fisheries Research Institute, May 2019-

  • Researcher, Japan Sea National Fisheries Research Institute, May 2015-Apr 2019

  • Researcher, Tohoku National Fisheries Research Institute, Nov 2011-Apr 2015

  • Postdoctoral Fellow, Tohoku National Fisheries Research Institute, Apr 2009-Oct 2011

  • Ph.D. Physical Science, Kyushu University, 2010

  • M. Sc. Fisheries Science, Hokkaido University, 2006

  • B. Sc. Fisheries, Hokkaido University, 2004

|| Current Research Interest
  • Characteristics and dynamics of the quasi-stationary jet contributing the formation of the deepest mixed layer in the North Pacific, from observation

  • Bathymetric influences of the Emperor Seamounts upon the flow field, with a focus on observational and numerical studies

|| Skills
  • Numerical experiment
    • Simplified ocean model: 1 layer, 2 layer, linear, nonlinear, bottom topography, QG, surface displacement
    • oceanic general circulation, bathymetric influence, vorticity balance analysis
  • In situ observation
    • short &sim long term, coastal &sim open ocean, several &sim thousands tons ship
    • CTD, moored velocity meter, micro structure profiler, trawl-resistant bottom mount ADCP, Slocum/Sea glider, Radiosonde
  • Data analysis
    • Instruments: CTD, ADCP, Argo float (CTD, trajectory), moored velocity meter, surface buoy, satellite altimeter & wind meter
    • Estimations: ADCP referenced geostrophic velocity, Argo float parking depth velocity, surface buoy drift velocity, optimal interpolation in space for two-dimensional nondivergent vector field
    • Analyses: correlation, spectrum, harmonics, principle component (EOF), current axis, volume transpot, water mass
  • Computer
    • Programing languages: Fortran
    • CUI & GUI analyses: Matlab, IDL, (DCL) PS library
    • LaTex: article, oral & poster presentations
    • Web page development & management: HTML, CGI, PHP
  • Human languages: Japanese, English, Chinese
  • Sports: baseball, football, swiming, table tennis

|| Membership of Academic Societies
  • American Geophysical Union (AGU), 2007-
  • Oceanographic Society of Japan (JOS), 2004-

|| Publications
  1. Wagawa, T., S. Ito, S. Kakehi, Y. Shimizu, K. Uehara, T. Kuragano, and T. Nakano: Flow structure of a quasi-stationary jet in the western subarctic Pacific (the Western Isoguchi Jet). Deep Sea Res., accepted.

  2. Kawaguchi, Y., T. Wagawa, Y. Igeta: Near-inertial internal waves and multiple-inertial oscillations trapped by negative vorticity anomaly in the central Sea of Japan. Prog. Oceanogr., 181, doi:https://doi.org/10.1016/j.pocean.2019.102240, 2020.

  3. Wagawa, T., Y. Kawaguchi, Y. Igeta, N. Honda, T. Okunishi, and I. Yabe: Observations of oceanic fronts and water-mass properties in the central Japan Sea: Repeated surveys from a glider. J. Mar. Sys., 201, doi:https://doi.org/10.1016/j.jmarsys.2019.103242, 2020.

  4. Testor P, de Young B, Rudnick DL, Glenn S, Hayes D, Lee CM, Pattiaratchi C, Hill K, Heslop E, Turpin V, Alenius P, Barrera C, Barth JA, Beaird N, Bécu G, Bosse A, Bourrin F, Brearley JA, Chao Y, Chen S, Chiggiato J, Coppola L, Crout R, Cummings J, Curry B, Curry R, Davis R, Desai K, DiMarco S, Edwards C, Fielding S, Fer I, Frajka-Williams E, Gildor H, Goni G, Gutierrez D, Haugan P, Hebert D, Heiderich J, Henson S, Heywood K, Hogan P, Houpert L, Huh S, E. InallM, IshiiM, Ito S-i, Itoh S, Jan S, Kaiser J, Karstensen J, Kirkpatrick B, Klymak J, Kohut J, Krahmann G, Krug M, McClatchie S, Marin F, Mauri E, Mehra A, P. Meredith MP, Meunier T, Miles T, Morell JM, Mortier L, Nicholson S, O’Callaghan J, O’Conchubhair D, Oke P, Pallàs-Sanz E, PalmerM, Park J, Perivoliotis L, Poulain PM, Perry R, Queste B, Rainville L, Rehm E, Roughan M, Rome N, Ross T, Ruiz S, Saba G, Schaeffer A, Schönau M, Schroeder K, Shimizu Y, Sloyan BM, Smeed D, Snowden D, Song Y, Swart S, Tenreiro M, Thompson A, Tintore J, Todd RE, Toro C, Venables H, Wagawa T, Waterman S, Watlington RA, and Wilson D: OceanGliders: A Component of the Integrated GOOS. Front. Mar. Sci., 6, doi: 10.3389/fmars.2019.00422.

  5. Tanaka, T., Y. Imamura, T. Kodama, T. Oikawa, A. Yagura, M. Saeki, K. Makabe, Y. Suzuki, S. Ohata, H. Kaneko, Y. Okazaki, H. Kuroda, T. Wagawa, D. Hasegawa, S. Kakehi, T. Okunishi: Development of water-mass cluster analysis software to analyze the water-mass variations off the coast of Tohoku Japan: A case study for future application to analyze fisheries catch variation. Bull. Jpn. Soc. Fish. Oceanogr., 83, 1-13, 2019.

  6. Kakehi, S., K. Naiki, T. Kodama, T. Wagawa, H. Kuroda, and S. Ito: Projections of nutrient supply to a wakame (Undaria pinnatifida) seaweed farm on the Sanriku Coast of Japan. Fish. Oceanogr., 27, 323-335, doi:https://doi.org/10.1111/fog.12255, 2018.

  7. Kodama, T., T. Wagawa, N. Iguchi, Y. Takada, T. Takahashi, K. Fukudome, H. Morimoto, and T. Goto: Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current. Ocean Sci., 14, 355-369, doi:10.5194/os-14-355-2018, 2018.

  8. Kodama, T., T. Wagawa, S. Ohshimo, H. Morimoto, N. Iguchi, K. Fukudome, T. Goto, M. Takahashi, and T. Yasuda: Improvement in recruitment of Japanese sardine with delays of the spring phytoplankton bloom in the Sea of Japan. Fish. Oceanogr., 27, 289-301, 2018.

  9. Mitsudera, H., T. Miyama, H. Nishigaki, T. Nakanowatari, H. Nishikawa, T. Nakamura, T. Wagawa, R. Furue, Y. Fujii, S. Ito: Low ocean-floor rises regulate subpolar sea surface temperature by forming baroclinic jets. Nature Communications, doi:10.1038/s41467-018-03526-z, 2018.

  10. Shimizu, Y., T. Okunishi, S. Kakehi, D. Hasegawa, T. Wagawa, Y. Igeta, N. Honda, T. Setou, H. Kuroda, and S. Ito: Historical document of operating ocean gliders in Japan Fisheries Research and Education Agency and prospect of their usage for the future (in Japanese with English abstract). J. Fish. Tech., 9, 33-41, 2017.

  11. Kakehi, S., S. Ito, and T. Wagawa: Estimating surface water mixing ratios using salinity and potential alkalinity in the Kuroshio-Oyashio mixed water regions. J. Geophys. Res., 122, 1927-1942, doi:10.1002/2016JC012268, 2017.

  12. Kuroda, H., T. Wagawa, S. Kakehi, Y. Shimizu, A. Kusaka, T. Okunishi, D. Hasegawa, and S. Ito: Long-term mean and seasonal variation of altimetry-derived Oyashio transport across the A-line off the southeastern coast of Hokkaido, Japan. Deep Sea Res., 121, 95-109, https://doi.org/10.1016/j.dsr.2016.12.006, 2017.

  13. Wagawa, T., Y. Igeta, N. Honda, S. Abe, M. Ito, T. Okunishi, D. Hasegawa, S. Kakehi, T. Setou, and Y. Shimizu: Hydrographic Observations in the Japan Sea with an Underwater Glider. Techno-Ocean, IEEE Part Number: CFP16TOO-USB, 595-598, 2016.

  14. Wagawa, T., T. Tamate, H. Kuroda, S. Ito, S. Kakehi, T. Yamanome, and T. Kodama: Relationship between coastal water properties and adult return of chum salmon (Oncorhynchus keta) along Sanriku coast, Japan. Fish. Oceanogr., 25, 598-609, doi:10.1111/fog.12175, 2016.

  15. Ito, S., M. Arima, M. Ichikawa, S. Aoki,, T. Okunishi, S. Kakehi, D. Hasegawa, T. Wagawa, I. Yasuda, T. Tanaka, H. Kuroda, Y. Shimizu: Possibility of Coastal Oceanographic Observations by Underwater Gliders. Bulletin on Coastal Oceanography, 53, 125-133, 2016.

  16. Kuroda, H., Y. Toya, T. Wagawa, A. Kuwata, T. Seto: Development of a high-resolution ocean model around Hokkaido : To evaluate effects of the Okhotsk Sea on ecosystem in the North Pacific. Low Temperature Science, 74, 115-125, 2016.

  17. Wagawa, T., H. Kuroda, S. Ito, S. Kakehi, T. Yamanome, K. Tanaka, Y. Endoh, and S. Kaga: Variability in water properties and predictability of sea surface temperature along Sanriku coast, Japan. Cont. Shelf Res., 103, 12-22, doi:10.1016/j.csr.2015.04.016, 2015.

  18. Kuroda, H., T. Wagawa, Y. Shimizu, S. Ito, S. Kakehi, T. Okunishi, S. Ohno, and A. Kusaka: Interdecadal decrease of the Oyashio transport on the continental slope off the southeastern coast of Hokkaido, Japan. J. Geophys. Res., 120, doi:10.1002/2014JC010402, 2015.

  19. Kakehi, S., S. Ito and T. Wagawa: Study of Characteristic and Generation Mechanism about Seiche in Sendai Bay, Japan (in Japanese with English abstract). Coastal Engineering Journal, 70, 456-460, 2014.

  20. Wagawa, T., S. Ito, Y. Shimizu, S. Kakehi, and D. Ambe: Currents associated with the quasi-stationary jet separated from the Kuroshio Extension. J. Phys. Oceanogr., 44, 1636-1653, doi:10.1175/JPO-D-12-0192.1, 2014.

  21. Kakehi, S., S. Ito, T. Kitsuda, and T. Wagawa: Quantification of the Throughflow Transport by using 3 Types of ADCPs in Mangoku-Ura Channel (in Japanese with English abstract). Coastal Engineering Journal, 69, 466-470, 2013.

  22. Ito, S., S. Kakehi, T. Okunishi, T. Wagawa, H. Yamada, M. Seito, T. Yamanome, M. Saeki, M. Ikegawa, T. Tokoro: Effectivity of marine environmental monitoring and current challenges in the Tohoku area where coastal and offshore oceans closely interact each other (in Japanese). Kaiyo Monthly, 45, 381-386, 2013.

  23. Wagawa, T., S. Ito, Y. Shimizu, S. Kakehi, and K. Uehara: Hydrographic observations conducted by the R/V Wakataka-Maru (in Japanese). Kaiyo Monthly, 44, 653-660, 2012.

  24. Yoshikawa, Y., T. Matsuno, T. Wagawa, T. Hasegawa, K. Nishiuchi, K. Okamura, H. Yoshimura, and Y. Morii: Tidal and low-frequency (geostrophic) currents along the CK Line (31 deg 45 min N) over the East China Sea shelf. Cont. Shelf Res., 50-51, 41-53, 2012.

  25. Kakehi, S., S. Ito, H. Yagi, and T. Wagawa: Estimation of the Residence Time of Fresh and Brackish Water in Sendai Bay (in Japanese with English abstract). Coastal Engineering Journal, 68, 951-955, 2012.

  26. Wagawa, T., Y. Yoshikawa, Y. Isoda, E. Oka, K. Uehara, T. Nakano, K. Kuma, and S. Takagi: Flow fields around the Emperor Seamounts detected from current data. J. Geophys. Res., 117, C06006, doi:10.1029/2011JC007530, 2012.

  27. Kuroda, H., Y. Isoda, H. Takeoka, K. Kuma, S. Honda, H. Matsuura, Y. Saitoh, H. Takata, S. Iwade, T. Wagawa, and N. Kobayashi: Intrusion of the Oyashio water into the eastern mouth of Tsugaru Strait in early summer, 2003. Cont. Shelf Res., 32, 36-46, 2012.

  28. Ito, S., Y. Shimizu, S. Kakehi, T. Wagawa, and M. Sato: Current status of underwater glider observations. Kaiyo Monthly, 42, 658-667, 2010.

  29. Yoshikawa, Y., T. Endoh, T. Matsuno, T. Wagawa, E. Tsutsumi, H. Yoshimura, and Y. Morii: The turbulent bottom Ekman boundary layer measured over a continental shelf. Geophys. Res. Lett., 37, L15605, doi:10.1029/2010GL044156, 2010.

  30. Wagawa, T., Y. Yoshikawa, and A. Masuda: Bathymetric influences of the Emperor Seamounts upon the subarctic gyre of the North Pacific: Examining boundary current dynamics along the eastern side of the mountain ridge with an idealized numerical model. J. Oceanogr., 66, 259-271, 2010.

  31. Saitoh, Y., K. Kuma, Y. Isoda, H. Kuroda, H. Matsuura, T. Wagawa, H. Takata, N. Kobayashi, S. Nagao, and T. Nakatsuka: Processes influencing iron distribution in the coastal waters of the tsugaru strait, japan. J. Oceanogr., 64, 815-830, 2008.

  32. Nakajima, K., Y. Isoda, H. Matsuura, T. Wagawa, T. Aiki, I. Yabe, H. Takata, K. Kuma, N. Kobayashi, and H. Yahaba: Tsushima Warm Current inflow to Tsugaru Strait (in Japanese with English abstract). Journal of the Marine Meteorological Society, 84, 1-16, 2008.

  33. Matsuura, H., Y. Isoda, H. Kuroda, K. Kuma, Y. Saitoh, N. Kobayashi, T. Aiki, T. Wagawa, I. Yabe, and Y. Hoshiba:: Water mass modification process of the passage-flow waters through the Tsugaru Strait (in Japanese with English abstract). Journal of the Marine Meteorological Society, 83, 21-35, 2007.

  34. Wagawa, T., Y. Isoda, N. Saitoh, T. Azumaya, and K. Sakaoka: Hydrographic structural change in the Transition Domain around the Emperor Seamounts (in Japanese with English abstract). Oceanogr. in Japan, 15, 267-281, 2006.

  35. Wagawa, T. and Y. Yoshikawa: Bathymetric Influences of the Emperor Seamounts upon the North Pacific Subarctic Gyre: Boundary Current along the Eastern Side of the Emperor Seamounts (in Japanese with English abstract). Reports of Research Institute for Applied Mechanics, Kyushu University, 134, 17-27, 2008.

  36. Wagawa, T., Y. Isoda, S. Takagi, and K. Sakaoka: Transition Domain on 155E median in 2002 and 2003 (in Japanese with English abstract). Bulletin of Fisheries Sciences, Hokkaido University, 55, 23-33, 2004.

|| Presentations
  • Wagawa, T., Y. Kawaguchi, Y. Igeta, N. Honda, T. Okunishi, and I. Yabe: Observations of oceanic fronts and water-mass properties in the central Japan Sea: Hydrographic surveys from gliders. 8th EGO Meeting and International Glider Workshop, Oral, New Brunswick, New Jersey, USA, May. 22, 2019.

  • Wagawa, T., Y. Kawaguchi, Y. Igeta, N. Honda, and T. Okunishi: Sectional glider measurements of fine-scale hydrography of frontal jets and mesoscale eddies in the Japan Sea. 2018 Ocean Sciences Meeting, Poster, Portland, Oregon, USA, Feb. 15, 2018.

  • Wagawa, T., Y. Kawaguchi, Y. Igeta, N. Honda, and T. Okunishi: Characterizing Water Properties of Mesoscale Vortex Pairs in the Sea of Japan: Observations from an Underwater Glider. AOGS Annual Meeting 2017, Poster, Singapore, Aug. 10, 2017.

  • Wagawa, T., Y. Kawaguchi, Y. Igeta, N. Honda, and T. Okunishi: Detailed water properties of mesoscale vortex pairs in the Sea of Japan: direct observations using an underwater glider. JpGU-AGU Joint Meeting 2017, Poster, Makuhari, Chiba, Japan, May. 21, 2017.

  • Wagawa, T., H. Kuroda, S. Ito, S. Kakehi, T. Yamanome, K. Tanaka, Y. Endoh and S. Kaga: Flow fields and distributions of water properties in the Sanriku Coastal Area. 2014 Ocean Sciences Meeting, Poster, 2231, Honolulu, Hawaii, USA, Feb. 24, 2014.

  • Wagawa, T., Y. Yoshikawa, Y. Isoda, E. Oka, T. Azumaya, K. Uehara, T. Nakano, K. Kuma, S. Takagi, Y. Kamei, and K. Sakaoka: Velocity field estimated from Argo floats and moored current meters around the Emperor Seamounts in the subarctic North Pacific. 2008 Western Pacific Geophysics Meeting, Oral, OS21B-02, Cairns, Queensland, Australia, Jul. 29, 2008.

  • Wagawa, T. and Y. Yoshikawa: Bathymetric influences of the Emperor Seamounts upon the North Pacific Subarctic Gyre: Boundary current along the eastern side of the Emperor Seamounts. 2008 Ocean Sciences Meeting, Oral, 032-04, Orland, Florida, USA, Mar. 4, 2008.

  • Wagawa, T., Y. Yoshikawa, Y. Isoda, and E. Oka: Bathymetric influences of the Emperor Seamounts upon the flow field in the North Pacific subarctic region. 3rd Program of the East Asian Cooperative Experiments, Oral, 4-2, Qingdao, China, Nov. 30, 2006.