Centers & Labs

RIKEN Advanced Institute for Computational Science

Computational Climate Science Research Team

Team Leader: Hirofumi Tomita (D.Eng.)
Hirofumi  Tomita(D.Eng.)

Out team provides a basic library for climate studies, which is highly tuned on K computer. It is well known that difference of numerical method in each of climate models leads difference of model results. This uncertainty is caused not only by the used numerical methods themselves but also by the combination of numerical schemes of each component. The construction of the basic library that covers major numerical schemes used generally in the climate simulation makes the intercomparison of numerical methods very easy. By using it, we can investigate what mechanism dose cause such uncertainties and where the main error does come from. For this purpose, our team cooperates with the computer science teams in AICS and the product of this research and development contributes the other science fields, especially, many fields which use computational fluid dynamics.

Main Research Field

Environmental science

Related Research Fields

Interdisciplinary science and engineering / Engineering

Research Subjects

  • Research of the methodology for simulations in the computational meteorology and climate science

Selected Publications

  1. 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).
  2. Sato, Y., Nishizawa, S., Yashiro, H., Miyamoto, Y., Kajikawa, Y., and Tomita, H.:
    “Impacts of cloud microphysics on trade wind cumulus: which cloud microphysics processes contribute to the diversity in a large eddy simulation?”
    Prog. Earth Planet. Sci., 2, 23 (2015).
  3. Iga, S.:
    “Smooth, seamless, and structured grid generation with flexibility in resolution distribution on a sphere based on conformal mapping and the spring dynamics method”
    J. Comp. Phys., 297, 381-406 (2015).
  4. Sato, Y., Miyamoto, Y., Nishizawa, S., Yashiro, H., Kajikawa, Y., Yoshida, R., Yamaura, T., and Tomita, H.:
    “Horizontal Distance of Each Cumulus and Cloud Broadening Distance Determine Cloud Cover”
    SOLA, 11, 75-79 (2015).
  5. Miyamoto, Y., Ito, J., Nishizawa, S., and Tomita, H.:
    “A linear thermal stability analysis of discretized fluid equations”
    Theoretical and Computational Fluid Dynamics 29, 155-169 (2015).
  6. Miyamoto Y., Yoshida, R., Yamaura, T., Yashiro, H., Tomita, H., and Kajikawa, Y.:
    “Does convection vary in different cloudy disturbances?”
    Atmos. Sci. Lett., 16, 3, 305-309 (2015).
  7. Kajikawa. Y., Yamaura, T., Tomita, H., and Satoh, M.:
    “Impact of tropical disturbance on the Indian summer monsoon onset simulated by global cloud-system-resolving model”
    SOLA, 11, 80-84 (2015).
  8. Miyakawa, T., Satoh, M., Miura, Tomita, H., Yashiro, H., H., Noda, A. T., Yamada, Y., Kodama, C., Kimoto, M., and Yoneyama, K.:
    “Madden-Julian Oscillation prediction skill of a new-generation global model demonstrated using a supercomputer”
    Nat. Commun., 5, 3769 (2014).
  9. Satoh, M., Tomita, H., Yashiro, H., Miura, H., Kodama, C., Seiki, T., Noda, A. T., Yamada, Y., Goto, D., Sawada, M., Miyoshi, T., Niwa, Y., Hara, M., Ohno, Y., Iga, S., Arakawa, T., Inoue, T., and Kubokawa, H.:
    “The Non-hydrostatic Icosahedral Atmospheric Model: Description and development”
    PEPS. 1, 18 (2014).
  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).

Lab Members

Principal Investigator

Hirofumi Tomita
Team Leader

Core Members

Yoshiyuki Kajikawa
Senior Scientist
Hisashi Yashiro
Research Scientist
Seiya Nishizawa
Research Scientist
Sachiho Adachi
Research Scientist
Yousuke Sato
Special Postdoctoral Researcher
Tsuyoshi Yamaura
Postdoctoral Researcher
Ryuji Yoshida
Postdoctoral Researcher
Yuta Kawai
Junior Research Associate
Kazuto Ando
Technical Staff I
Hiroaki Miura
Visiting Scientist
Yoshiaki Miyamoto
Visiting Scientist
Mizuo Kajino
Visiting Scientist
Hiroshi Taniguchi
Visiting Scientist

Contact information


Email: htomita [at]

Related links

Recent research results