An Evaluation of the Reproducibility of the Madden-Julian Oscillation in the CMIP3 Multi-Models
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概要
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The simulated Madden-Julian oscillation (MJO) in the climate of the 20th Century (20C3M) experiment of 23 models participating in the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) is examined. The models having moisture-convergence-type convection schemes well simulate the MJO signal in precipitation. By analyzing the data from these models, we confirm that the MJO convection is active from the Indian Ocean to the western Pacific, consistent with the observations. However, analyses of the structure of the simulated MJO reveal that the convergence of the surface wind tends to be overestimated in the models. In addition, the peak of the MJO signal over the Indian Ocean is relatively weaker than that over the maritime continent and the western Pacific, and shifts westward in the models. These inconsistencies appear to arise from the distribution of sea-surface temperature (SST) bias. As a general tendency in all of the climate models studied, it is also demonstrated that the skill of the MJO simulation correlates positively with that of the climatological SST. Potential importance of the basic field and the air-sea coupling in the MJO simulation is suggested.
- 2009-08-25
著者
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TAKAYABU Yukari
Center for Climate System Research, The University of Tokyo
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Sato Naoki
Tokyo CCU network Scientific Committee
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Yoneyama Kunio
Res. Inst. For Global Change/japan Agency For Marine-earth Sci. And Technol.
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Yoneyama Kunio
Research Institute For Global Change Japan Agency For Marine-earth Science And Technology
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Shirooka Ryuichi
Research Institute For Global Change Japan Agency For Marine-earth Science And Technology
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Takayabu Yukari
Center For Climate System Research University Of Tokyo:research Institute For Global Change Japan Ag
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Takayabu Yukari
Center For Climate System Research The University Of Tokyo
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TAKAHASHI Chiharu
Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology
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SEIKI Ayako
Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology
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Seiki Ayako
Research Institute For Global Change Japan Agency For Marine-earth Science And Technology
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Sato Naoki
Tokyo Gakugei University:research Institute For Global Change Japan Agency For Marine-earth Science
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Takahashi Chiharu
Res. Inst. For Global Change/japan Agency For Marine-earth Sci. And Technol.
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Takahashi Chiharu
Research Institute For Global Change Japan Agency For Marine-earth Science And Technology
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Takayabu Yukari
Center For Climate System Research (ccsr) University Of Tokyo
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