loading page

Nonhydrostatic Icosahedral Atmospheric Model (NICAM) studies on the supercomputer Fugaku: Challenges and next directions
  • +3
  • Satoh Masaki,
  • Chihiro Kodama,
  • Hisashi Yashiro,
  • Tomoki Miyakawa,
  • Yohei Yamada,
  • Woosub Roh
Satoh Masaki
Atmosphere and Ocean Research Institute, The University of Tokyo

Corresponding Author:[email protected]

Author Profile
Chihiro Kodama
Author Profile
Hisashi Yashiro
NIES National Institute of Environmental Studies
Author Profile
Tomoki Miyakawa
Atmosphere and Ocean Research Institute
Author Profile
Yohei Yamada
Japan Agency for Marine-Earth Science and Technology
Author Profile
Woosub Roh
Atmosphere and Ocean Research Institute
Author Profile


NICAM (Nonhydrostatic Icosahedral Atmospheric Modeling) has been used to conduct global storm resolving simulations with a mesh size of O(km) over the globe (Satoh, M. et al. 2017). Using the supercomputer “Fugaku”, we explore studies in the following directions: 1. Large-ensemble simulations (1000 members), 2. longer-duration simulations (100 years: HighResMIP; Kodama, C. et al. 2021), 3. higher-resolution simulations (less than a kilometer dx; Miyamoto et al. 2013), 4. high-resolution atmosphere-ocean coupled model simulations (atmosphere 3.5 km × ocean 0.1 deg: NICOCO; Miyakawa, T. et al. 2017), and 5. large ensemble data assimilations with NICAM-LETKF (Yashiro, H. et al. 2020). In this talk, we first review the current activities of NICAM on Fugaku. As the most uncertain component of atmospheric models in general, we intercompared the cloud properties of the DYAMOND simulation data (Stevens, B. et al. 2019; Roh, W. et al. 2021). We found that the domain averaged outgoing long-wave radiation is relatively similar across the models, but the net shortwave radiation at the top of the atmosphere shows significant differences among the models (Figure). The vertical profiles of cloud concentration are widely divergent among models, and cloud water content exhibits larger intermodel differences than cloud ice. This result implies more focused evaluations of clouds are required for improving the global storm resolving models. The forthcoming satellite “EarthCARE” (Illingworth, A. et al. 2015) provides a comprehensive dataset for cloud evaluations of atmospheric models, particularly by the first cloud Doppler radar from space. We present possible strategies for the new era of satellite collaboration studies with global storm resolving models.