Different transient climate responses of two versions of an atmosphere-ocean coupled general circulation model

Tokuta Yokohata, S. Emori, Toru Nozawa, T. Ogura, N. Okada, T. Suzuki, Y. Tsushima, M. Kawamiya, A. Abe-Ouchi, H. Hasumi, A. Sumi, M. Kimoto

Research output: Contribution to journalArticle

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Abstract

The Model for Interdisciplinary Research on Climate (MIROC), an atmosphere-ocean coupled general circulation model (AOGCM), has two versions with different resolutions, high (Hi-Res) and medium (Mid-Res). While their equilibrium climate sensitivities (ECS) to CO2 increases are similar, the transient climate response (TCR) of the Hi-Res version is larger than that of the Mid-Res version. The former shows the highest transient response among the Intergovernmental Panel on Climate Change (IPCC) fourth assessment report (AR4) climate models. Our climate feedback analysis indicates that the higher TCR of the Hi-Res version mainly comes from its larger ice-albedo feedback (SFC-SW) and lower ocean heat uptake (OHU). Since the Hi-Res version shows better agreement with observation than the Mid-Res version concerning the factors that affect the SFC-SW and OHU, the TCR of the Hi-Res version is not considered to be unrealistic compared to that of the Mid-Res version. On the other hand, the two versions have similar SFC-SW values and negligible OHU in ECS experiments performed by the atmosphere-slab ocean coupled general circulation model (ASGCM). In the ASGCM, the difference in SFC-SW between the two versions was likely suppressed due to artificial fluxes applied to the ocean and sea-ice system.

Original languageEnglish
Article numberL02707
JournalGeophysical Research Letters
Volume34
Issue number2
DOIs
Publication statusPublished - Jan 28 2007
Externally publishedYes

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climate
general circulation model
oceans
atmospheres
atmosphere
ocean
heat
slab
slabs
climate feedback
sea ice
climate models
sensitivity
Intergovernmental Panel on Climate Change
transient response
climate change
albedo
climate modeling
ice
high resolution

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Different transient climate responses of two versions of an atmosphere-ocean coupled general circulation model. / Yokohata, Tokuta; Emori, S.; Nozawa, Toru; Ogura, T.; Okada, N.; Suzuki, T.; Tsushima, Y.; Kawamiya, M.; Abe-Ouchi, A.; Hasumi, H.; Sumi, A.; Kimoto, M.

In: Geophysical Research Letters, Vol. 34, No. 2, L02707, 28.01.2007.

Research output: Contribution to journalArticle

Yokohata, T, Emori, S, Nozawa, T, Ogura, T, Okada, N, Suzuki, T, Tsushima, Y, Kawamiya, M, Abe-Ouchi, A, Hasumi, H, Sumi, A & Kimoto, M 2007, 'Different transient climate responses of two versions of an atmosphere-ocean coupled general circulation model', Geophysical Research Letters, vol. 34, no. 2, L02707. https://doi.org/10.1029/2006GL027966
Yokohata, Tokuta ; Emori, S. ; Nozawa, Toru ; Ogura, T. ; Okada, N. ; Suzuki, T. ; Tsushima, Y. ; Kawamiya, M. ; Abe-Ouchi, A. ; Hasumi, H. ; Sumi, A. ; Kimoto, M. / Different transient climate responses of two versions of an atmosphere-ocean coupled general circulation model. In: Geophysical Research Letters. 2007 ; Vol. 34, No. 2.
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