EGU21-8580, updated on 04 Mar 2021
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

HighResMIP climate simulations with NICAM and beyond on supercomputer Fugaku

Chihiro Kodama1, Yohei Yamada1, Tomoki Ohno1, Tatsuya Seiki1, Hisashi Yashiro2, Akira T. Noda1, Masuo Nakano1, Woosub Roh3, Masaki Satoh1,3, Tomoko Nitta3, Daisuke Goto2, Hiroaki Miura1,4, Tomoe Nasuno1, Tomoki Miyakawa3, Ying-Wen Chen3, and Masato Sugi5
Chihiro Kodama et al.
  • 1Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan (
  • 2National Institute for Environmental Studies
  • 3Atmosphere and Ocean Research Institute, The University of Tokyo
  • 4Graduate School of Science, The University of Tokyo
  • 5Meteorological Research Institute

The Non-hydrostatic ICosahedral Atmospheric Model (NICAM), a global model with an icosahedral grid system, has been under development for nearly two decades. Here, we present its recent updates for the Coupled Model Intercomparison Project Phase 6, High Resolution Model Intercomparison Project (HighResMIP) and their impact on the simulated mean states using 56-14km mesh model. Major updates include updates of the cloud microphysics scheme and land surface model, introduction of natural and anthropogenic aerosols and a subgrid-scale orographic gravity wave drag scheme, and improvement of the coupling between the cloud microphysics and the radiation schemes. A short-term sensitivity experiments demonstrate improvements in the ice water content, high cloud amount, surface air temperature over the Arctic region, location and strength of zonal mean subtropical jet, and shortwave radiation over Africa and South Asia. The decadal climate simulations further reveal an improvement in the genesis and structure of the tropical cyclones compared with those with the previous model. Finally, we will address outlook toward the cloud-resolving climate simulation based on a fresh benchmark result on supercomputer Fugaku, a flagship supercomputer in Japan.

How to cite: Kodama, C., Yamada, Y., Ohno, T., Seiki, T., Yashiro, H., Noda, A. T., Nakano, M., Roh, W., Satoh, M., Nitta, T., Goto, D., Miura, H., Nasuno, T., Miyakawa, T., Chen, Y.-W., and Sugi, M.: HighResMIP climate simulations with NICAM and beyond on supercomputer Fugaku, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-8580,, 2021.

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