Dr. Takenobu Toyota, Assistant Professor

Contact address:

Research interests

• Growth and decay processes of sea ice in the seasonal ice zone.
• Ice floe size distribution especially for small floes.
• Properties of sea ice and overlying snow.
• Estimation of ice thickness distribution with remote sensing

Work experience

• 1987-1991: Sapporo District Meteorological Observatory
• 1991-1995: Head-quarters of Japan Meteorological Agency
• 1999-present: Institute of Low Temperature Science, Hokkaido University

Academic qualifications

• 1985 Bachelor of Science, University of Tokyo
• 1987 Master of Science, University of Tokyo
• 1998 Doctoral Degree of Earth Environmental Science, Hokkaido University

Teaching

• Lectures
  • Practice of Geophysical Fluid Dynamics
  • Polar Oceanography 　　
  • Sea ice field course
  • Physics I (for undergraduate students)
  
  
• Theses of Graduate Students
  • Master Course
    • 「Characteristics of sea ice floe size distribution in the southern Sea of Okhotsk」
    • 「A study on the variability of brine channel properties within sea-ice associated with seasonal change」
    • 「Transition of structual properties of sea ice during the early melt season」
    • 「Formation processes of granular ice of sea ice in the laboratory experiments」
    • 「Properties of sea ice in the Sea of Okhotsk from the aspect of the atmospheric heat budgets」
    • 「A study on the dynamical growth processes of sea ice in the southern Sea of Okhotsk, using satellite L-band SAR images」
    • 「A study on the properties of granular ice (sea ice) through the laboratory experiments 」
    
    
  • Doctor Course
    • 「Studies on lake ice thickness evolution with emphasis on roles of snow at Lake Abashiri, Hokkaido, Japan」

Research grants (as a Principal Investigator)

• Apr 2022 - Mar 2025:
  "A study on the effect of dynamical deformation processes on the interannual variation of the sea ice extent in the seasonal ice zones",
  Japan Society for the Promotion of Science (KAKEN-HI)
• Apr 2022 - Mar 2025:
  "Validation of the algorithm with L-band SAR data for detecting deformed sea ice area in the Arctic Ocean",
  JAXA 3rd Research Programme on the Earth Observations
• May 2019 - Mar 2022:
  "Validation of the algorithm with L-band SAR data for detecting deformed sea ice area in the Arctic Ocean",
  JAXA 2nd Research Programme on the Earth Observations
• Apr 2019 - Mar 2022:
  "Development of the parameterization of the sea ice deformation processes based on the year-round comprehensive dataset in the Arctic Ocean",
  Japan Society for the Promotion of Science (KAKEN-HI)
• Apr 2016 - Mar 2019:
  "Monitoring of ice thickness distribution to improve the understanding of the dynamical processes of seasonal sea ice from satellite and field observations",
  Japan Society for the Promotion of Science (KAKEN-HI)
• Apr 2012 - Mar 2015:
  "A study on wave-ice interaction and ice floe formation processes in the marginal ice zone",
  Japan Society for the Promotion of Science (KAKEN-HI)
• Apr 2010 - Mar 2013:
  "Development of algorithm for sea ice thickness retrieval in the seasonal sea ice zone with ALOS/PALSAR and its application to the multi-year ice regions",
  JAXA: ALOS data Research Programme
• Apr 2009 - Mar 2012:
  "Global mapping of sea ice thickness and its application to the numerical sea ice model in the seasonal ice zone",
  Japan Society for the Promotion of Science (KAKEN-HI)
• Jul 2011 - Sep 2011:
  "Study on wave-sea ice interaction in the marginal sea ice zone and its relation with the floe size distribution",
  Japan Society for the Promotion of Science: NZRS/JSPS scientist exchange programme
• Apr 2006 - Mar 2009:
  "Examination of a sea ice numerical model based on the real conditions of seasonal sea ice",
  Japan Society for the Promotion of Science (KAKEN-HI)

Committee

• 2001 - 2003 The Japanese Society of Snow and Ice, Hokkaido Branch, Accountant
• 2019 - 2023 International Union of Geodesy and Geophysics (IUGG),
  International Association of Cryospheric Sciences (IACS), Head of Sea Ice, Lake and River Ice Division
• 2021 IUGG/IACS Early Career Scientist Award, The 2021 evaluation panel
• 2023 IUGG/IACS Early Career Scientist Award, The 2023 evaluation panel
• 2023 The International Glaciological Society, International Symposium on Sea Ice 2023, Science Steering Committee
• 2023- Annals of Glaciology, Vol. 65, "Sea ice across temporal and spatial scales", Scienitific Editor

Peer-reviewed paper

• Uto, S., T. Matsuzawa, H. Shimoda, D. Wako, T. Toyota (2024):
  Formulation and validation of resistance prediction scheme for ships in ice regime described in WMO egg code.
  Cold Regions Science and Technology, 221, 104159. https://doi.org/10.1016/j.coldregions.2024.104159 (in press)
• Toyoda, T., K. Sakamoto, T. Toyota, H. Tsujino, L.S. Urakawa, Y. Kawakami, K.K. Komatsu, G. Yamanaka, T. Tanikawa, R. Shimada, H. Nakano (2024):
  Improvement of sea ice thermodynamics with variable sea ice salinity and melt pond parameterizations in an OGCM.
  Ocean Modelling, 187, 102288. hhtps://doi.org/10.1016/j.ocemod.2023.102288
• Kuga, M., K.I. Ohshima, S. Kishi, N. Kimura, T. Toyota, J. Nishioka (2024):
  Backward-tracking simulations of sea ice in the Sea of Okhotsk toward understanding of material transport through sea ice.
  Journal of Oceanography, 80, 59-70. https://doi.org/10.1007/s10872-023-00706-4
• Toyota, T., N. Kimura, J. Nishioka, M. Ito, D. Nomura, H. Mitsudera (2022):
  The interannual variability of sea ice area, thickness, and volume in the southern Sea of Okhotsk and its likely factors.
  Journal of Geophysical Research: Oceans, 127(12), e2022JC019069. https://doi.org/10.1029/2022JC019069.
• Sahashi, R., D. Nomura, T. Toyota, M. Tozawa, M. Ito, P. Wongpan, K. Ono, D. Simizu, K. Naoki, Y. Nosaka, T. Tamura, S. Aoki, S. Ushio (2022):
  Effects of snow and remineralization processes on nutrient distributions in multi-year Antarctic landfast sea ice.
  Journal of Geophisical Research: Oceans, 127(7), e2021JC018371. https://doi.org/10.1029/2021JC01837.
• Waseda, T., A. Alberello, T. Nose, T. Toyota, T. Kodaira, Y. Fujiwara (2022):
  Observation of anomalous spectral downshifting of waves in the Okhotsk Sea Marginal Ice Zone.
  Philosophical Transactions of the Royal Society of London. A, A380: 20210256. https://doi.org/10.1098/rsta.2021.0256
• Yan, D., J. Nishioka, T. Toyota, K. Suzuki (2022):
  Winter microalgal communities of the southern Sea of Okhotsk: A comparison of sea ice, coastal, and basinal seawater.
  Progress in Oceanography, 204, 102806. https://doi.org/10.1016/j.pocean.2022.102806
• Yoroisaka, K., M. Kawata, T. Toyota, and M. Matsuda (2021):
  Experimental study for improving the prevention of railway snow soaring by water sprinkling at air temperature below the freezing point.
  Journal of the Japanese Society of Snow and Ice (Seppyo), Vol. 83(6), 599-608.https://doi.org/10.5331/seppyo.83.6_599 (in Japanese with English summary)
• Tanikawa, T., K. Masuda, H. Ishimoto, T. Aoki, M. Hori, M. Niwano, A. Hachikubo, S. Matoba, K. Sugiura, T. Toyota, N. Ohkawara, K. Stamnes (2021):
  Spectral degree of linear polarization and neutral points of polarization in snow and ice surfaces.
  Journal of Quantitative Spectroscopy and Radiative Transfer, 273, 107845, ISSN 0022-4073. doi: 10.1016/j.jqsrt.2021.107845
• Toyota, T., J. Ishiyama, and N. Kimura (2021):
  Measuring deformed sea ice in seasonal ice zones using L-band SAR images.
  IEEE Transactions on Geoscience and Remote Sensing, 59(11), 9361-9381. doi: 10.1109/TGRS.2020.3043335
• Saiki, R., H. Mitsudera, A. Manome, N. Kimura, J. Ukita, T. Toyota, and T. Nakamura (2021):
  Mechanism of ice-band pattern formation caused by resonant interaction between sea ice and internal waves in a continuously stratified ocean.
  Progress in Oceanography, 190, 102474. doi: 10.1016/j.pocean.2020.102474
• Yoshida, K., H. Hattori, T. Toyota, A. McMinn, and K. Suzuki (2020):
  Differences in diversity and Photoprotection capability between ice algae and under-ice phytoplankton in Saroma-Ko Lagoon, Japan:
  a comparative taxonomic diatom analysis with microscopy and DNA barcoding.
  Polar Biology, 43(11), 1873-1885. doi: 10.1007/s00300-020-02751-x
• Wongpan, P., D. Nomura, T. Toyota, T. Tanikawa, K. Meiners, T. Ishino, T. Tamura, M. Tozawa, Y. Nosaka, T. Hirawake, A. Ooki, and S. Aoki (2020):
  Using under-ice hyperspectral transmittance to determine land-fast sea ice algal biomass in Saroma-ko Lagoon, Hokkaido, Japan.
  Annals of Glaciology, 61(83), 454-463. doi: 10.1017/aog.2020.69
• Yan, D., K. Yoshida, J. Nishioka, M. Ito, T. Toyota, and K. Suzuki (2020):
  Response to sea ice melt indicates high seeding potential of the ice diatom Thalassiosira to spring phytoplankton blooms:
  A laboratory study on an ice algal community from the Sea of Okhotsk.
  Frontiers in Marine Science, 7:613. doi: 10.3389/fmars.2020.00613
• Toyota, T., T. Ono, T. Tanikawa, P. Wongpan, and D. Nomura (2020):
  Solidification effects of snowfall on sea ice freeze-up: results from an onsite experimental study.
  Annals of Glaciology, 61(83), 299-308. doi: 10.1017/aog.2020.49
• Nomura, D., P. Wongpan, T. Toyota, T. Tanikawa, Y. Kawaguchi, T. Ono, T. Ishino, M. Tozawa, T.P. Tamura, I.S. Yabe, E.Y. Son, F. Vivier, A. Lourenco, M. Lebrun, Y. Nosaka, T. Hirawake, A. Ooki, S. Aoki, B. Else, F. Fripiat, J. Inoue, and M. Vancoppenolle (2020):
  Saroma-ko Lagoon Observations for sea ice Physico-chemistry,. and Ecosystems 2019 (SLOPE2019).
  Bulletin of Glaciological Research, 38, 1-12. doi: 10.5331/bgr.19R02
• Zhang, W., N. Ebuchi, Y. Fukamachi, F. Cheng, Kay I. Ohshima, B. Emery, T. Toyota, H. Abe, and K. Shirasawa (2020):
  Sea ice observation by high frequency ocean radar.
  IEEE Transactions on Geoscience and Remote Sensing, 58(1), 378-390. doi: 10.1109/TGRS.2019.2936576
• Kanna, N., Y. Sibano, T. Toyota, and J. Nishioka (2018):
  Winter iron supply processes fueling spring phytoplankton growth in a sub-polar marginal sea, the Sea of Okhotsk:
  Importance of sea ice and the East Sakhalin Current.
  Marine Chemistry, 206, 109-120. doi: 10.1016/j.marchem.2018.08.006
• Nihashi, S., N.T. Kurtz, T. Markus, K.I. Ohshima, K. Tateyama, and T. Toyota (2018):
  Estimation of sea-ice thickness and volume in the Sea of Okhotsk based on ICESat data.
  Annals of Glacilogy, 59(76), 101-111. doi: 10.1017/aog.2018.8
• Toyota, T., and N. Kimura (2018):
  An examination of the sea ice rheology for seasonal ice zones based on ice drift and thickness observations.
  Journal of Geophysical Research: Oceans, 123, 1406-1428. doi: 10.1002/2017JC013627
• Ohata, Y., T. Toyota, and A.D. Fraser (2017):
  The role of snow in the thickening processes of lake ice at Lake Abashiri, Hokkaido, Japan.
  Tellus A: Dynamic Meteorology and Oceanography, 69:1, 1391655. doi: 10.1080/16000870.2017.1391655
• Ohata, Y., T. Toyota, and T. Shiraiwa (2016):
  Lake ice formation processes and thickness evolution at Lake Abashiri, Hokkaido, Japan.
  Journal of Glaciology, 62(233), 563-578. doi: 10.1017/jog.2016.57
• Toyota, T., R. Massom, O. Lecomte, D. Nomura, P. Heil, T. Tamura, and A.D. Fraser (2016):
  On the extraordinary snow on the sea ice off East Antarctica in late winter, 2012.
  Deep-Sea Research II, 131, 53-67. doi: 10.1016/j.dsr2.2016.02.003
• Toyota, T., A.L. Kohout, and A.D. Fraser (2016):
  Formation processes of sea ice floe size distribution in the interior pack and its relationship to the marginal ice zone off East Antarctica.
  Deep-Sea Research II, 131, 28-40. doi: 10.1016/j.dsr2.2015.10.003
• Lecomte, O., and T. Toyota (2016):
  Influence of wet conditions on snow temperature diurnal variations: An East-Antarctic sea ice case study.
  Deep-Sea Research II, 131, 68-74. doi: 10.1016/j.dsr2.2015.12.011
• Kohout, A.L., M.J.M. Williams, T. Toyota, J. Lieser, and J. Hutchings (2016):
  In situ observations of wave-induced sea ice breakup.
  Deep-Sea Research II, 131, 22-27. doi: 10.1016/j.dsr2.2015.06.010
• Williams, G. D., A. D. Fraser, A. Lucieer, D. Turner, E. Cougnon, P. Kimball, T. Toyota, T. Maksym, H. Singh, F. Nitsche, and M. Paget (2016):
  Drones in a cold climate.
  Eos, 97(5), 17-21. doi: 10.1029/2016EO043673
• Tamura, T., K.I. Ohshima, J.L. Lieser, T. Toyota, K. Tateyama, D. Nomura, K. Nakata, A.D. Fraser, P.W. Jansen, K.B. Newbery, R.A. Massom, and S. Ushio (2015):
  Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk.
  Annals of Glaciology, 56(69), 436-444. doi: 10.3189/2015AoG69A621
• Granskog, M.A., D. Nomura, S. Muller, A. Krell, T. Toyota, H. Hattori (2015):
  Evidence for significant protein-like dissolved organic matter accumulation in Sea of Okhotsk sea ice.
  Annals of Glaciology, 56(69), 1-8. doi: 10.3189/2015AoG69A002
• Kanna, N., T. Toyota, and J. Nishioka (2014):
  Iron and macro-nutrient concentrations in sea ice and their impact on the nutritional status of surface waters in the southern Okhotsk Sea.
  Progress in Oceanography, 126, 44-57. doi: 10.1016/j.pocean.2014.04.012
• Toyota, T., I.J. Smith, A.J. Gough, P.J. Langhorne, G.H. Leonard, R.J. Van Hale, A.R. Mahoney, and T.G. Haskell (2013):
  Oxygen isotope fractionation during the freezing of seawater.
  Journal of Glaciology, 59(216), 697-710. doi: 10.3189/2013JoG12J163
• Ishii, H. and T. Toyota (2012):
  Temporal evolution of the structural properties of seasonal sea ice during the early melt season.
  Journal of Glaciology, 58(207), 23-37. doi: 10.3189/2012JoG11J155
• Toyota, T., S. Ono, K. Cho, and K.I. Ohshima (2011):
  Retrieval of sea ice thickness distribution in the Sea of Okhotsk from ALOS/PALSAR backscatter data.
  Annals of Glaciology, 52(57) 177-184. doi: 10.3189/172756411795931732
• Toyota, T., R. Massom, K. Tateyama, T. Tamura, and A. Fraser (2011):
  Properties of snow overlying the sea ice off East Antarctica in late winter 2007.
  Deep Sea Research II, 58(9-10), 1137-1148. doi: 10.1016/j.dsr2.2010.12.002
• Toyota, T., C. Haas, and T. Tamura (2011):
  Size distribution and shape properties of relatively small sea ice floes in the Antarctic marginal ice zones in late winter.
  Deep Sea Research II, 58(9-10), 1182-1193. doi: 10.1016/j.dsr2.2010.10.034
• Nomura, D., H. Yoshikawa-Inoue, T. Toyota, K. Shirasawa (2010):
  Effects of snow, snow-melting and re-freezing processes on air-sea ice CO2 flux.
  Journal of Glaciology, 56(196), 262-270. doi:10.3189/002214310791968548
• Nomura, D., J. Nishioka, M. A. Granskog, A. Krell, S. Matoba, T. Toyota, H. Hattori and K. Shirasawa (2010):
  Nutrient distributions associated with snow and sediment-laden layers in sea ice of the southern Sea of Okhotsk.
  Marine Chemistry, 119, 1-8. doi: 10.1016/j.marchem.2009.11.005
• Nakamura, K., S. Aoki, T. Toyota, and Y. Aoyama (2010):
  Meridional distribution and seasonal variation of stable oxygen isotope ratio of precipitation in the Southern Ocean.
  Antarctic Record, 54(2), 190-202. (in Japanese with English summary)
• Fujisaki, A., H. Yamaguchi, T. Toyota, A. Futatsudera and M. Miyanaga (2009):
  Measurements of air-ice drag coefficient over the ice-covered Sea of Okhotsk.
  Journal of Oceanography, 65(4), 487-498. https://doi.org/10.1007/s10872-009-0042-8
• Toyota, T., K. Nakamura, S. Uto, K.I. Ohshima, and N. Ebuchi (2009):
  Retrieval of sea ice thickness distribution in the seasonal ice zone from air-borne L-band SAR.
  International Journal of Remote Sensing, 30(12), 3171-3189. https://doi.org/10.1080/01431160802558790
• Toyota, T., S. Takatsuji, K. Tateyama, K. Naoki, K.I. Ohshima (2007):
  Properties of sea ice and overlying snow in the southern Sea of Okhotsk.
  Journal of Oceanography, 63(3), 393-411. https://doi.org/10.1007/s10872-007-0037-2
• Tateyama, K., K. Shirasawa, S. Uto, T. Kawamura, T. Toyota and H. Enomoto (2006):
  Standardization of electromagnetic–induction measurements of sea–ice thickness in polar and sub–polar seas.
  Annals of Glaciology, 44, 240-246. https://doi.org/10.3189/172756406781811484
• Uto, S., T. Toyota, H. Shimoda, K. Tateyama, and K. Shirasawa (2006):
  Ship-borne electromagnetic induction sounding of sea ice thickness in the south Okhotsk Sea.
  Annals of Glaciology, 44, 253-260. https://doi.org/10.3189/172756406781811510
• Nomura, D., H. Yoshikawa-Inoue, and T. Toyota (2006):
  The effect of sea-ice growth on air–sea CO2 flux in a tank experiment.
  Tellus, 58B, 418-426. doi: 10.1111/j.1600-0889.2006.00204.x
• Fukamachi, Y., G. Mizuta, K. I. Ohshima, T. Toyota, N. Kimura, and M. Wakatsuchi (2006):
  Sea ice thickness in the southwestern Sea of Okhotsk revealed by a moored ice-profiling sonar.
  Journal of Geophysical Research, 111, C09018. doi:10.1029/2005JC003327
• Toyota, T., S. Takatsuji, and M. Nakayama (2006):
  Characteristics of sea ice floe size distribution in the seasonal ice zone.
  Geophysical Research Letters, 33, L02616. doi:10.1029/2005GL024556
• Inoue, J. and T. Toyota (2005):
  Characteristics of aerosol number concentrations over the ice-covered Okhotsk Sea.
  Journal of Meteorological Society of Japan, 83(4), 633-640. https://doi.org/10.2151/jmsj.83.633
• Toyota, T., T. Kawamura, K.I. Ohshima, H. Shimoda, and M. Wakatsuchi (2004):
  Thickness distribution, texture and stratigraphy, and a simple probabilistic model for dynamical thickening of sea ice in the southern Sea of Okhotsk.
  Journal of Geophysical Research - Oceans, 109, C06001. doi:10.1029/2003JC002090
• Toyota, T., K. Baba, E. Hashiya, and K. I. Ohshima (2002):
  In-situ ice and meteorological observations in the southern Sea of Okhotsk in 2001 winter: ice structure, snow on ice, surface temperature, and optical environments.
  Polar Meteorology and Glaciology, 16, 116-132.
• Tateyama, K., H. Enomoto, T. Toyota, and S. Uto (2002):
  Sea ice thickness estimated from passive microwave radiometers,
  Polar Meteorology and Glaciology, 16, 15-31.
• Toyota, T. and M. Wakatsuchi (2001):
  Characteristics of the surface heat budget during the ice-growth season in the southern Sea of Okhotsk.
  Annals of Glaciology, 33, 230-236. https://doi.org/10.3189/172756401781818400
• Toyota, T., T. Kawamura and M. Wakatsuchi (2000):
  Heat budget in the ice cover of the southern Okhotsk Sea derived from in-situ observations.
  Journal of Meteorological Society of Japan, 78(5), 585-596. https://doi.org/10.2151/jmsj1965.78.5_585
• Ukita, J., T. Kawamura, N. Tanaka, T. Toyota, and M. Wakatsuchi (2000):
  Physical and stable isotopic properties and growth processes of sea ice collected in the southern Sea of Okhotsk.
  Journal of Geophysical Research, 105(C9), 22,083-22,093. https://doi.org/10.1029/1999JC000013
• Toyota, T., J. Ukita, K. Ohshima, M. Wakatsuchi and K. Muramoto (1999):
  A measurement of sea ice albedo over the southwestern Okhotsk Sea.
  Journal of Meteorological Society of Japan, 77(1), 117-133. https://doi.org/10.2151/jmsj1965.77.1_117
• Sumi, A., and T. Toyota (1988):
  Observational study on air-flow around the Tibetan Plateau.
  Journal of Meteorological Society of Japan, 66(1), 113-124. https://doi.org/10.2151/jmsj1965.66.1_113
• Nakamura, H., T. Toyota, M. Ohbayashi (1986):
  Geographical distribution of the ratio of lengths of warm fronts to cold fronts in the Northern Hemisphere during 1978-1979 winter.
  Journal of Meteorological Society of Japan, 64(4), 519-529. https://doi.org/10.2151/jmsj1965.64.4_519

Books (written in English)

• Toyota, T. (2018)：Guideline of Ocean Observations, Vol. 7, Chap. 5 ver.2, "Sea Ice", The Oceanographic Society of Japan, G705ENr1:001-047.
  (Associated with the revision of WMO sea ice nomenclature in 2014)
• Toyota, T. (2016)：Guideline of Ocean Observations, Vol. 7, Chap. 5, "Sea Ice", The Oceanographic Society of Japan, G705EN:001-041.
  
• Toyota, T. (2009): Application of remote sensing to the estimation of sea ice thickness distribution.
  In "Advances in Geoscience and Remote Sensing", Jedlovec,G.(Ed.), pp.21-44, In-Teh, DOI: 10.5772/46139
  ISBN: 978-953-307-005-6, Vienna, Austria.
• Toyota, T. (2009): A study on growth processes of sea ice in the southern Sea of Okhotsk, 143pp.,
  VDM Verlag, ISBN: 978-3-639-19602-3, Saarbrucken, Germany.

Proceedings of International Conference

• Toyota, T., Y. Yamashita, and H. Koda (2023): A study on the properties of granular ice of sea ice from laboratory experiments.
  Proceedings of the 37the International Symposium on Okhotsk Sea & Polar Oceans 2023, Mombetsu, Japan, February 20-22, 209-212.
• Toyoda, T., K. Sakamoto, T. Toyota, H. Tsujino, S. Urakawa, Y. Kawakami, A. Yamagami, K. Komatsu, G. Yamanaka, T. Tanikawa, and H. Nakano (2023):
  Improvements of sea ice thermodynamics and salt content parameterizations in an OGCM.
  Proceedings of the 37th International Symposium on Okhotsk Sea & Polar Oceans 2023, Mombetsu, Japan, February 20-22, 222-225.
• Nishioka, J., T. Toyota, A. Murayama, K. Ono, M. Imai, Y. Yamashita, K. Suzuki, T. Nakamura, K.I. Ohshima, and H. Mitsudera (2023):
  Characteristics of water masses and nutrients conditions in the southern Sea of Okhotsk.
  Proceedings of the 37th International Symposium on Okhotsk Sea & Polar Oceans 2023, Mombetsu, Japan, February 20-22, 239-241.
• Sun, Y., J. Nishioka, T. Toyota, and K. Suzuki (2023):
  Differences in phytoplankton communities and their controlling environmental factors in the southern Sea of Okhotsk between winter and spring.
  Proceedings of the 37th International Symposium on Okhotsk Sea & Polar Oceans 2023, Mombetsu, Japan, February 20-22, 255-256.
• Toyota, T., Y. Arihara, T. Waseda, M. Ito, and J. Nishioka (2022): Observations of ice cakes with a drone in the southern Sea of Okhotsk.
  Proceedings of the 36th International Symposium on Okhotsk Sea & Polar Oceans 2022, Mombetsu, Japan, February 21-23, 237-240.
• Uto, S., and T. Toyota (2022): Evaluation of ship resistance in ice regime using ice chart.
  Proceedings of the 36th International Symposium on Okhotsk Sea & Polar Oceans 2022, Mombetsu, Japan, February 21-23, 124-127.
• Ito, M., T. Toyota, J. Nishioka, D. Nomura, N. Kanna, K. Murakami, and K.I. Ohshima (2019): Grease ice observations in the southern Sea of Okhotsk with P/V Soya.
  Proceedings of the 34th International Symposium on Okhotsk Sea & Polar Oceans 2019, Mombetsu, Japan, February 17-22, 247-250.
• Toyota, T., and J. Ishiyama (2019): Application of ALOS-2/PALSAR-2 for detecting defromed sea ice area in the Sea of Okhotsk.
  Proceedings of the 34th International Symposium on Okhotsk Sea & Polar Oceans 2019, Mombetsu, Japan, February 17-22, 279-282.
• Takahashi, S., and T. Toyota (2018): Changes of Sea-Ice nomenclature from WMO 1970 to WMO 2014 -What is the English name of "Ryuhyo" (in Japanese)?
  Proceedings of the 33rd International Symposium on Okhotsk Sea & Polar Oceans 2018, Mombetsu, Japan, February 18-21, 322-325.
• Toyota, T., and J. Ishiyama (2018): Properties of deformed sea ice area in the southern Sea of Okhotsk derived from satellite SAR images.
  Proceedings of the 33rd International Symposium on Okhotsk Sea & Polar Oceans 2018, Mombetsu, Japan, February 18-21, 207-210.
• Toyota, T., and H. Koda (2016): Tank experiments on the granular ice formation processes.
  Proceedings of the 23rd IAHR International Symposium on Ice, Ann Arbor, USA, ISSN: 2414-6331, 8 pages.
• Ohata, Y., T. Toyota, A.D. Fraser, and T. Shiraiwa (2016): The role of snow-ice in the thickening processes of lake ice at Lake Abashiri, Hokkaido, Japan.
  Proceedings of the 23rd IAHR International Symposium on Ice, Ann Arbor, USA, ISSN: 2414-6331, 8 pages.
• Ozeki, T., Y. Yashiro, G. Sagawa, K. Tateyama, and T. Toyota (2016): Field observations of impingign seawater spray
  using sea spray meters, - Case study of the icebreaker Soya -.
  Proceedings of The 31st International Symposium on Okhotsk Sea & Sea Ice, Mombetsu, Japan, February 22-23, 182-185.
• Koda, H., and T. Toyota (2014):The formation process of granular ice of the seawater in laboratory experiments.
  Proceedings of The 29th International Symposium on Okhotsk Sea & Sea Ice, Mombetsu, Japan, February 16-19, 135-137.
• Toyota, T., and N. Kimura (2013): On the validity of the sea ice rheology by Hibler for the Sea of Okhotsk ice.
  Proceedings of The 28th International Symposium on Okhotsk Sea & Sea Ice, Mombetsu, Japan, February 18-20, 91-94.
• Toyota, T., and C. Haas (2011): Possibility of ice thickness retrieval in the Okhotsk Sea and the Lincoln Sea using ALOS/PALSAR.
  Proceedings of The 26th International Symposium on Okhotsk Sea & Sea Ice, Mombetsu, Japan, February 21-23, 63-66.
• Toyota, T., H. Kamimura, S. Ono, and K. Cho (2009):
  Retrieval of sea ice thickness distribution in the Sea of Okhotsk from ALOS/PALSAR backscatter data.
  Proceedings of The 24th International Symposium on Okhotsk Sea & Sea Ice, Mombetsu, Japan, February 16-18, 138-142.
• Granskog, M., T. Toyota, H. Hattori, D. Nomura, and A. Krell (2009):
  Observationson physical properties and biogeochemistry of sea ice in southern Sea of Okhotsk.
  Proceedings of The 24th International Symposium on Okhotsk Sea & Sea Ice, Mombetsu, Japan, February 16-18, 183-186.
• Toyota, T., K. Nakamura, T. Tamura, K. Cho, and K.I. Ohshima (2007):
  Development of sea ice thickness algorithm from PALSAR data, combined with in-situ observations and other satellite data.
  Proceedings of The First Joint PI symposium of ALOS Data Nodes for ALOS Science Program in Kyoto, Japan, December 19-22,
  4 pages (CD-ROM).
• Toyota, T., K. Nakamura, S.Uto, K.I. Ohshima, and N. Ebuchi (2007):
  Retrieval of ice thickness distribution in the seasonal ice zone from L-band SAR.
  Proceedings of 2007 IEEE International Geoscience and Remote Sensing Symposium, Barcelona, Spain, July 23-27, 4 pages (CD-ROM).
• Toyota, T. (2007): Retrieval of sea ice thickness distribution with ALOS/PALSAR.
  Proceedings of The 22th International Symposium on Okhotsk Sea and Sea Ice, Mombetsu, Japan, February 18-23, 53.
• Toyota, T., S. Takatsuji, K. Tateyama, M. Nakayama, K. Naoki, K.I. Ohshima (2004):
  Properties of thick sea ice and overlying snow in the southern Sea of Okhotsk. Proceedings of the 17th IAHR International Symposium on Ice, St. Petersburg, Russia, 406-412.
• Toyota, T. and H. Enomoto (2002): Analysis of the sea ice floes in the Sea of Okhotsk using ADEOS/AVNIR images. Proceedings of the 16th IAHR International Symposium on Ice, Dunedin, New Zealand, 211-217.
• Toyota, T., T. Kawamura, and J. Ukita (2001):
  Sea ice structure in the Sea of Okhotsk. Proceedings of the international symposium on atmosphere-ocean-cryosphereinteraction in the Sea of Okhotsk and the surrounding environment, Sapporo. 66-67.
• Toyota, T., T. Kawamura, T. Nakatsuka (2001):
  Contribution of snow to the sea ice growth in the southern Sea of Okhotsk. Proceedings of the international symposium on atmosphere-ocean-cryosphere interaction in the Sea of Okhotsk and the surrounding environment, Sapporo. 56-57.
• Toyota, T. and K. Sato (1993): The improvement of the thermodynamical process of JMA operational numerical sea ice model in the southern part of the Sea of Okhotsk. Proceedings of 93's international symposium on sea ice, Beijing, 147-154.