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Discussion papers | Copyright
https://doi.org/10.5194/gmd-2018-155
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 16 Jul 2018

Model description paper | 16 Jul 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Description and basic evaluation of simulated mean state, internal variability, and climate sensitivity in MIROC6

Hiroaki Tatebe1, Tomoo Ogura2, Tomoko Nitta3, Yoshiki Komuro1, Koji Ogochi1, Toshihiko Takemura4, Kengo Sudo5, Miho Sekiguchi6, Manabu Abe1, Fuyuki Saito1, Minoru Chikira3, Shingo Watanabe1, Masato Mori7, Nagio Hirota2, Yoshio Kawatani1, Takashi Mochizuki1, Kei Yoshimura3, Kumiko Takata2, Ryouta O'ishi3, Dai Yamazaki8, Tatsuo Suzuki1, Masao Kurogi1, Takahito Kataoka1, Masahiro Watanabe3, and Masahide Kimoto3 Hiroaki Tatebe et al.
  • 1Japan Agency for Marine - Earth Science and Technology, Yokohama, Japan
  • 2National Institute for Environmental Studies, Tsukuba, Japan
  • 3Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan
  • 4Research Institute for Applied Mechanics, Kyushu University, Kasuga, Japan
  • 5Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
  • 6Tokyo University of Marine Science and Technology, Tokyo, Japan
  • 7Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan
  • 8Institute of Industrial Sciences, University of Tokyo, Tokyo, Japan

Abstract. The sixth version of the Model for Interdisciplinary Research on Climate (MIROC), called MIROC6, was cooperatively developed by a Japanese modeling community. In the present manuscript, simulated mean climate, internal climate variability, and climate sensitivity in MIROC6 are evaluated and briefly summarized in comparison with the previous version of our climate model (MIROC5) and observations. The results show that overall reproducibility of mean climate and internal climate variability in MIROC6 is better than that in MIROC5. The tropical climate systems (e.g., summertime precipitation in the western Pacific and the eastward propagating Madden-Julian Oscillation) and the mid-latitude atmospheric circulations (e.g., the westerlies, the polar night jet, and troposphere-stratosphere interactions) are significantly improved in MIROC6. These improvements can be attributed to the newly implemented parameterization for shallow convective processes and to the directly resolved stratosphere. While there are significant differences in climates and variabilities between the two models, the effective climate sensitivity of 2.5K remains the same because the differences in radiative forcing and climate feedback tend to offset each other. With an aim towards contributing to the sixth phase of the Coupled Model Intercomparison Project, designated simulations tackling a wide range of climate science issues, as well as seasonal-to-decadal climate predictions and future climate projections, are currently ongoing using MIROC6.

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Short summary
For deeper understanding of a wide range of climate science issues, the latest version of the Japanese climate model, called MIROC6, was developed. The climate model well represents observed mean-climate and climate variations, for example, tropical precipitations, the mid-latitude westerlies, and the East Asian monsoon which influence human activity all over the world. The improved climate simulations could add reliability of climate predictions under the global warming.
For deeper understanding of a wide range of climate science issues, the latest version of the...
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