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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/gmd-2019-369
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-369
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Apr 2020

01 Apr 2020

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This preprint is currently under review for the journal GMD.

The non-hydrostatic global atmospheric model for CMIP6 HighResMIP simulations (NICAM16-S): Experimental design, model description, and sensitivity experiments

Chihiro Kodama1, Tomoki Ohno1, Tatsuya Seiki1, Hisashi Yashiro2, Akita T. Noda1, Masuo Nakano1, Yohei Yamada1, Woosub Roh3, Masaki Satoh3,1, Tomoko Nitta3, Daisuke Goto2, Hiroaki Miura4, Tomoe Nasuno1, Tomoki Miyakawa3, Ying-Wen Chen3, and Masato Sugi5 Chihiro Kodama et al.
  • 1Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan
  • 2National Institute for Environmental Studies, Tsukuba, Ibaraki,305-8506, Japan
  • 3Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, 277-8564, Japan
  • 4Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, 113-0033, Japan
  • 5Meteorological Research Institute, Tsukuba, 305-0052, Japan

Abstract. NICAM, a nonhydrostatic global atmospheric model with an icosahedral grid system, has been developed for nearly two decades. This paper describes NICAM16-S, the latest stable version of NICAM (NICAM.16) modified for Coupled Model Intercomparison Project Phase 6 (CMIP6). Major updates from NICAM.12, a previous version used for climate simulations, include updates of a cloud microphysics scheme and a land model, an introduction of natural and anthropogenic aerosols and a subgrid-scale orographic gravity wave drag, and improvement of coupling between cloud microphysics and radiation schemes. External forcings were updated to follow a protocol of CMIP6 High Resolution Model Intercomparison Project (HighResMIP). A series of short-term sensitivity experiments were performed to check and understand impacts of the model updates on the simulated mean states. Improvements in the ice water content, the high cloud amounts, the surface air temperature over the Arctic region, the location and the strength of zonal mean subtropical jet, and shortwave radiation over the Africa and the South Asia were found in the NICAM16-S simulations. Some long-standing biases such as the double intertropical convergence zone and smaller low cloud amounts still exist or even worsen in some cases, suggesting further necessity for understanding their mechanisms and upgrading schemes and/or their parameter settings as well as for enhancing horizontal and vertical resolutions.

Chihiro Kodama et al.

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Chihiro Kodama et al.

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The non-hydrostatic global atmospheric model for CMIP6 HighResMIP simulations (NICAM16-S) (Version NICAM16-S) C. Kodama, T. Ohno, T. Seiki, H. Yashiro, A. T. Noda, M. Nakano, Y. Yamada, W. Roh, M. Satoh, T. Nitta, D. Goto, H. Miura, T. Nasuno, T. Miyakawa, Y.-W. Chen, M. Sugi https://doi.org/10.5281/zenodo.3727329

Chihiro Kodama et al.

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Short summary
This paper describes NICAM16-S, the latest stable version of a global non-hydrostatic atmospheric model for Coupled Model Intercomparison Project Phase 6 (CMIP6). A series of sensitivity experiments show many improvements compared with a previous version of the model, encouraging further use of such high-resolution global model as a climate model. Also, some long-standing biases exist, suggesting further necessity for understanding their mechanisms, upgrading schemes, and enhancing resolutions.
This paper describes NICAM16-S, the latest stable version of a global non-hydrostatic...
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