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RIKEN Center for Computational Science Computational Climate Science Research Team

Team Leader: Hirofumi Tomita (D.Eng.)

Research Summary

Hirofumi  Tomita(D.Eng.)

In climate simulations, combinations of numerical methods in models lead to large uncertainties of results. The necessary issues are to identify which part does cause the uncertainties and to estimate the inevitable uncertainties. To make such issues be easily resolved, our team develops the common library for computational climate science with high efficiency on high performance computers. The library systematizes various schemes, providing with model itself and analysis tools. At the same time, we will carry out pioneering works of large-scale climate computing. To do them, we are constructing the numerical schemes and reconsidering their theories by more principle than that in conventional models.

Main Research Fields

  • Environmental Science

Related Research Fields

  • Interdisciplinary Science & Engineering
  • Engineering


  • high performance computing
  • climate modeling

Selected Publications

  • 1. Yashiro, H., Terasaki, K., Kawai, Y., Kudo, S., Miyoshi, T., Imamura, T., Minami, K., Inoue, H., Nishiki, T., Saji, T., Satoh, M., and Tomita, H.:
    "A 1024-Member ensemble data assimilation with 3.5-Km mesh global weather simulations"
    in SC20: International Conference for High Performance Computing, Networking, Storage and Analysis (SC), Atlanta, GA, US, pp. 1-10 (2020)
  • 2. Yanase, T., Nishizawa, S., Miura, H., Takemi, T., and Tomita, H.:
    "New critical lenght for the onset of self-aggregation of moist convection"
    Geophys. Res. Lett., 47, e2020GL088763 (2020).
  • 3. Adachi, S. A. and Tomita, H.:
    "Methodology of the constraint condition in dynamical downscaling for regional climate evaluation: A review"
    J. Geophys. Res., 125 (11), e2019JD032166 (2020).
  • 4. Sueki, K., Yamaura, T., Yashiro, H., Nishizawa, S., Yoshida, R., Kajikawa, Y., and Tomita, H.:
    "Convergence of convective updraft emsembles with respect to the grid spacing of atmospheric models"
    Geophys. Res. Lett., 46, 14817-14825 (2019).
  • 5. Sato, Y., Goto, D., Michibata, T., Suzuki, K., Takemura, T., Tomita, H. and Nakajima, T.:
    "Aerosol effects on cloud water amounts were successfully simulated by a global cloud-system resolving model"
    Nature Communications, 9, 985 (2018).
  • 6. Adachi, S. A., Nishizawa, S., Yoshida, R., Yamaura, T., Ando, K., Yashiro, H., Kajikawa, Y., and Tomita, H.:
    "Contributions of changes in climatology and perturbation and the resulting nonlinearity to regional climate change"
    Nature Communications, 8, 2224 (2017).
  • 7. Nishizawa, S., Odaka, M., Takahashi, Y. O., Sugiyama, K., Nakajima, K., Ishiwatari, M., Takehiro, S., Yashiro, H., Sato, Y., Tomita, H., and Hayashi, Y.-Y.:
    "Martian dust devil statistics from high-resolution large-eddy simulations"
    Geophysical Research Letters, Volume 43, Issue 9, Pages 4180–4188 (2016).
  • 8. Sato, Y., Miura, H., Yashiro, H., Goto, D., Takemura, T., Tomita, H., and Nakajima, T.:
    "Unrealistically pristine air in the Arctic produced by current global scale models"
    Scientific Reports, 6, Article number: 26561 (2016).
  • 9. Nishizawa, S., Yashiro, H., Sato, Y., Miyamoto, Y., and Tomita, H.:
    "Influence of grid aspect ratio on planetary boundary layer turbulence in large-eddy simulations"
    Geosci. Model Dev., 8, 3393-3419 (2015).
  • 10. Miyamoto, Y., Kajikawa, Y., Yoshida, R., Yamaura, T., Yashiro, H., and Tomita, H.:
    "Deep moist atmospheric convection in a sub-kilometer global simulation"
    Geophys. Res. Lett., pp.4922–4926 (2013).

Recent Research Results

Related Links

Lab Members

Principal investigator

Hirofumi Tomita
Team Leader

Core members

Yoshiyuki Kajikawa
Senior Scientist
Seiya Nishizawa
Research Scientist
Sachiho Adachi
Research Scientist
Tomoro Yanase
Special Postdoctoral Researcher
Yuta Kawai
Postdoctoral Researcher
Tamaki Suematsu
Postdoctoral Researcher
Kaman Kong
Postdoctoral Researcher
Tsuyoshi Yamaura
Technical Scientist
Miyuki Tsubouchi
Technical Staff I
Hiroaki Miura
Visiting Scientist
Hisashi Yashiro
Visiting Scientist
Yoshiaki Miyamoto
Visiting Scientist
Yousuke Sato
Visiting Scientist
Shin-ichiro Shima
Visiting Scientist
Ryuji Yoshida
Visiting Scientist

Contact Information

Email: htomita [at] riken.jp