• Toshio SUGA

    Professor
    • Physical Oceanography Laboratory
    • Department of Geophysics, Graduate School of Science, Tohoku University
    • 6-3 Aramkai-aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan
    • Tel: +81-22-795-6527
    • Fax: +81-22-795-6530
    • E-mail suga @ pol.gp.tohoku.ac.jp
  • Degrees
    • B.Sc., 1985, Tohoku University, Japan
    • M.Sc., 1987, Tohoku University, Japan
    • D.Sc., 1991, Tohoku University, Japan
  • Interests
    • Large scale ocean circulation
    • Ocean ventilation processes
    • Water mass processes
    • Mesoscale/submesoscale processes
    • Biogeochemical impacts of above-mentioned processes
    • Role of the oceans in climate and climate variability
  • Selected publications
    • Ueno, H., I. Yasuda, S. Itoh, H. Onishi, Y. Hiroe, T. Suga and E. Oka, 2012: Modification of a Kenai eddy along the Alaskan Stream. J. Geophys. Res., 117, C08032, DOI:10.1029/2011JC007506.
    • Oka, E., B. Qiu, S, Kouketsu, K. Uehara, and T. Suga, 2012: Decadal seesaw of the Central and Subtropical Mode Water formation associated with the Kuroshio Extension variability. J. Oceanogr., 68, 355-360.
    • Kobayashi, T., K. Mizuno, and T. Suga, 2012: Long-term variations of surface and intermediate waters in the southern Indian Ocean along 32S. J. Oceanogr., 68, 234-265.
    • Toyama, K., and T. Suga, 2012: Roles of mode waters in formation and maintenance of central water in the North Pacific. J. Oceanogr., 68, 79-92.
    • Sukigara, C., T. Suga, T. Saino, K. Toyama, D. Yanagimoto, K. Hanawa, and N. Shikama, 2011: Biogeochemical evidence of large diapycnaldiffusivity associated with the Subtropical Mode Water of the North Pacific. J. Oceanogr., 67, 77-85.
    • Oka, E., S. Kouketsu, K. Toyama, K. Uehara, T. Kobayashi, S. Hosoda, and T. Suga, 2011: Formation and subduction of Central Mode Water based on profiling float data 2003-2008. J. Phys. Oceanogr., 41, 113-129.
    • Oka, E., T. Suga, C. Sukigara, K. Toyama, K. Shimada and J.@Yoshida, 2011: "Eddy resolving" observation of the North Pacific Subtropical Mode Water.@J. Phys. Oceanogr., 41, 666-68.
    • Saito, H., T. Suga, K. Hanawa, and N. Shikama, 2011: The Transition Region Mode Water of the North Pacific and its rapid modification. J. Phys. Oceanogr., 41, 1639-1658.
    • Tsubouchi, T., T. Suga, and K. Hanawa, 2010: Indian Ocean Subtropical Mode Water: its water characteristics and spatial distribution. Ocean Sci., 6, 41-50.
    • Toyama, K., and T. Suga, 2010: Vertical structures of North Pacific mode waters. Deep-Sea Res., 57, 1152-1160.
    • Sugimoto, S., K. Hanawa, K. Narikiyo, M. Fujimori, and T. Suga, 2010: Temporal variations of the net Kuroshio transport and its relation to atmospheric variations. J. Oceanogr., 66, 611-619.
    • Hosoda, S., T. Ohira, K. Sato, and T. Suga, 2010: Improved description of global mixed-layer depth using Argo profiling floats. J. Oceanogr., 66, 773-787.
    • Ooki, A., A. Tsuda, S. Kameyama, S. Takeda, S. Itoh, T. Suga, H. Tazoe, A. Okubo, and Y. Yokouchi, 2010: Methyl halides in surface seawater and marine boundary layer of the northwest Pacific. J. Geophys. Res., 115, C10013, doi:10.1029/2009JC005703.
    • Oka, E., K. Toyama, and T. Suga, 2009: Subduction of North Pacific central mode water associated with subsurface mesoscale eddy. Geophys. Res. Lett., 36, L08607, doi:10.1029/2009GL037540.
    • Ueno, H., H. Freeland, W. R. Crawford, H. Onishi, E. Oka, K. Sato, and T. Suga, 2009: Anticyclonic eddies in the Alaskan Stream. J. Phys. Oceanogr., 39, 934-951.
    • Hosoda S., T. Suga, N. Shikama, and K. Mizuno, 2009: Global surface layer salinity change detected by Argo and its implication for hydrological cycle intensification. J. Oceanogr., 65, 579-586.
    • Sato, K., and T. Suga, 2009: Structure and Modification of the South Pacific Eastern Subtropical Mode Water. J. Phys. Oceanogr., 39, 1700-1714.
    • Sukigara, C., T. Suga, T. Saino, K. Toyama, D. Yanagimoto, K. Hanawa, and N. Shikama, 2009: Subsurface primary production in the western subtropical North Pacific as evidence of large diapycnal diffusivity associated with the Subtropical Mode Water. Ocean Science Discussion, 6, 1717-1734.
    • Suga, T., Y. Aoki, H. Saito, and K. Hanawa, 2008: Ventilation of the North Pacific subtropical pycnocline and mode water formation. Prog. Oceanogr., 77, 285-297.
    • Kizu, S., H. Onishi, T. Suga, K. Hanawa, T. Watanabe, and H. Iwamiya, 2008: Evaluation of the fall rates of the present and developmental XCTDs. Deep-Sea Res., 55, 571-586.
    • Oka, E., L. D. Talley, and T. Suga, 2007: Temporal variability of winter mixed layer in the mid- to high-latitude North Pacific. J. Oceanogr., 63, 293-307.
    • Ueno, H., E. Oka, T, Suga, H. Onishi, and D. Roemmich, 2007: Formation and variation of temperature inversions in the eastern subarctic North Pacific. Geophys. Res. Lett., L05603, doi:10.1029/2006GL028715.
    • Tsubouchi, T., T. Suga, and K. Hanawa, 2007: Three types of South Pacific subtropical mode waters: The relation to the large-scale circulation of the south Pacific subtropical gyre and their temporal variability. J. Phys. Oceanogr., 37, 2478-2490.
    • Saito, H., T. Suga, K. Hanawa, and T. Watanabe, 2007: A new type of pycnostad in the western subtropical-subarctic transition region in the North Pacific: Transition Region Mode Water. J. Oceanogr., 63, 589-600.
    • Suga, T., 2007: Chapter 3.@Ocean@Circulation. In: Oceanography Basics -The Textbook for Sixteenth IHP Training Course in 2006- international hydrology programme, edited by Morimoto, A., The Hydrospheric Atmospheric Research Center, Nagoya University, and United Nation Educational Scientific and Cultural Organization (UNESCO), 37-55.
    • Kobayashi, T; Suga, T. 2006. The Indian Ocean HydroBase: A high-quality climatological dataset for the Indian Ocean. PROGRESS IN OCEANOGRAPHY, 68 (1): 75-114.
    • Oka, E; Suga, T. 2005. Differential formation and circulation of North Pacific Central Mode Water. JOURNAL OF PHYSICAL OCEANOGRAPHY, 35 (11): 1997-2011.
    • Ueno, H; Oka, E; Suga, T; Onishi, H. 2005. Seasonal and interannual variability of temperature inversions in the subarctic North Pacific. GEOPHYSICAL RESEARCH LETTERS, 32 (20): art. no.-L20603.
    • Ohno, Y; Kobayashi, T; Iwasaka, N; Suga, T. 2004. The mixed layer depth in the North Pacific as detected by the Argo floats. GEOPHYSICAL RESEARCH LETTERS, 31 (11): art. no.-L11306.
    • Sato, K; Suga, T; Hanawa, K. 2004. Barrier layer in the North Pacific subtropical gyre. GEOPHYSICAL RESEARCH LETTERS, 31 (5): art. no.-L05301.
    • Suga, T; Motoki, K; Aoki, Y; Macdonald, AM. 2004. The North Pacific climatology of winter mixed layer and mode waters. JOURNAL OF PHYSICAL OCEANOGRAPHY, 34 (1): 3-22.
    • Oka, E; Suga, T. 2003. Formation region of North Pacific subtropical mode water in the late winter of 2003. GEOPHYSICAL RESEARCH LETTERS, 30 (23): art. no.-2205.
    • Uehara, H; Suga, T; Hanawa, K; Shikama, N. 2003. A role of eddies in formation and transport of North Pacific Subtropical mode water. GEOPHYSICAL RESEARCH LETTERS, 30 (13): art. no.-1705.
    • Suga, T; Motoki, K; Hanawa, K. 2003. Subsurface water masses in the Central North Pacific Transition Region: The repeat section along the 180 degrees meridian. JOURNAL OF OCEANOGRAPHY, 59 (4): 435-444.
    • Miura, T; Suga, T; Hanawa, K. 2003. Numerical study of formation of dichothermal water in the Bering Sea. JOURNAL OF OCEANOGRAPHY, 59 (3): 369-376.
    • Iwasaka, N; Suga, T; Takeuchi, K; Mizuno, K; Takatsuki, Y; Ando, K; Kobayashi, T; Oka, E; Ichikawa, Y; Miyazaki, M; Matsuura, H; Izawa, K; Yang, CS; Shikama, N. 2003. Pre-Japan-ARGO: Experimental observation of upper and middle layers south of the Kuroshio Extension region using profiling floats. JOURNAL OF OCEANOGRAPHY, 59 (1): 119-127.
    • Bingham, FM; Suga, T; Hanawa, K. 2002. Origin of waters observed along 137 degrees E. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 107 (C7): art. no.-3073.
    • Miura, T; Suga, T; Hanawa, K. 2002. Winter mixed layer and formation of dichothermal water in the Bering Sea. JOURNAL OF OCEANOGRAPHY, 58 (6): 815-823.
    • Aoki, Y; Suga, T; Hanawa, K. 2002. Subsurface subtropical fronts of the North Pacific as inherent boundaries in the ventilated thermocline. JOURNAL OF PHYSICAL OCEANOGRAPHY, 32 (8): 2299-2311.
    • Macdonald, AM; Suga, T; Curry, RG. 2001. An isopycnally averaged North Pacific climatology. JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY, 18 (3): 394-420.
    • Suga, T; Kato, A; Hanawa, K. 2000. North Pacific Tropical Water: its climatology and temporal changes associated with the climate regime shift in the 1970s. PROGRESS IN OCEANOGRAPHY, 47 (2-4): 223-256.
    • Taneda, T; Suga, T; Hanawa, K. 2000. Subtropical mode water variation in the northwestern part of the North Pacific subtropical gyre. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 105 (C8): 19591-19598.
    • Suga, T; Takei, Y; Hanawa, K. 1997. Thermostad distribution in the North Pacific subtropical gyre: The General mode water and the subtropical mode water. JOURNAL OF PHYSICAL OCEANOGRAPHY, 27 (1): 140-152.
    • SUGA, T; TALLEY, LD. 1995. ANTARCTIC INTERMEDIATE WATER CIRCULATION IN THE TROPICAL AND SUBTROPICAL SOUTH-ATLANTIC. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 100 (C7): 13441-13453.
    • SUGA, T; HANAWA, K. 1995. THE SUBTROPICAL MODE WATER CIRCULATION IN THE NORTH PACIFIC. JOURNAL OF PHYSICAL OCEANOGRAPHY, 25 (5): 958-970.
    • SUGA, T; HANAWA, K. 1995. INTERANNUAL VARIATIONS OF NORTH PACIFIC SUBTROPICAL MODE WATER IN THE 137-DEGREES-E SECTION. JOURNAL OF PHYSICAL OCEANOGRAPHY, 25 (5): 1012-1017.
    • SUGA, T; HANAWA, K. 1990. THE MIXED-LAYER CLIMATOLOGY IN THE NORTHWESTERN PART OF THE NORTH PACIFIC SUBTROPICAL GYRE AND THE FORMATION AREA OF SUBTROPICAL MODE WATER. JOURNAL OF MARINE RESEARCH, 48 (3): 543-566.
    • SUGA, T; HANAWA, K; TOBA, Y. 1989. SUB-TROPICAL MODE WATER IN THE 137-DEGREES-E SECTION. JOURNAL OF PHYSICAL OCEANOGRAPHY, 19 (10): 1605-1618.
    • HANAWA, K; WATANABE, T; IWASAKA, N; SUGA, T; TOBA, Y. 1988. SURFACE THERMAL CONDITIONS IN THE WESTERN NORTH PACIFIC DURING THE ENSO EVENTS. JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN, 66 (3): 445-456.