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Chief Scientist Laboratories Mathematical Climatology Laboratory

Chief Scientist: Hirofumi Tomita (D.Eng.)

Research Summary

Hirofumi  Tomita(D.Eng.)

We aim to understand important processes for climate system and uncertainty in future climate prediction from the viewpoint of mathematical science. Our study will focus on the evaluation of convergence of solution by using LES instead of current turbulence scheme (RANS), the construction of theory for moist LES including phase transition of water, the sophistication of physical processes (e.g., micro-physics) and development of fast algorithm for these schemes, and the proposal of appropriate parameterization to low resolution models.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Complex Systems


  • Understanding of self-organization and hierarchical structure of cloud related to atmospheric turbulence
  • Exploration of climatological multi equilibrium solution under ideal condition
  • Development of new downscaling simulation method for regional climate projection

Selected Publications

  • 1. Yanase, T., S. Nishizawa, H. Miura, T. Takemi, and H. Tomita:
    "New critical length for the onset of self-aggregation of moist convection"
    Geophys. Res. Lett., 47, e2020GL088763 (2020).
  • 2. Adachi, S. A. and H. Tomita:
    "Methodology of the constraint condition in dynamical downscaling for regional climate evaluation: A review"
    J. Geophys. Res., 125 (11), e2019JD032166. (2020).
  • 3. Sueki, K., T. Yamaura, H. Yashiro, S. Nishizawa, R. Yoshida, Y. Kajikawa, and H. Tomita:
    "Convergence of convective updraft ensembles with respect to the grid spacing of atmospheric models"
    Geophysical Research Letters, 46, 14817-14825. (2019).
  • 4. Adachi, S. A., S. Nishizawa, K. Ando, T. Yamaura, R. Yoshida, H. Yashiro, Y. Kajikawa, and H. Tomita:
    "An evaluation method for uncertainties in regional climate projections"
    Atmospheric Science Letters, Volume20, Issue1, e877. (2019).

Annual research report

Related Links

Lab Members

Principal investigator

Hirofumi Tomita
Chief Scientist

Core members

Sachiho Adachi
Research Scientist
Tomoro Yanase
Special Postdoctoral Researcher

Contact Information

RIKEN Center for Computational Science
7-1-26, Minatojima-minami-machi,
Chuo-ku, Kobe, Hyogo,
650-0047, Japan
Email: htomita [at] riken.jp