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The boreal summer intraseasonal oscillation simulated by four Chinese AGCMs participating in the CMIP5 project

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Abstract

The performances of four Chinese AGCMs participating in the Coupled Model Intercomparison Project Phase 5 (CMIP5) in the simulation of the boreal summer intraseasonal oscillation (BSISO) are assessed. The authors focus on the major characteristics of BSISO: the intensity, significant period, and propagation. The results show that the four AGCMs can reproduce boreal summer intraseasonal signals of precipitation; however their limitations are also evident. Compared with the Climate Prediction Center Merged Analysis of Precipitation (CMAP) data, the models underestimate the strength of the intraseasonal oscillation (ISO) over the eastern equatorial Indian Ocean (IO) during the boreal summer (May to October), but overestimate the intraseasonal variability over the western Pacific (WP). In the model results, the westward propagation dominates, whereas the eastward propagation dominates in the CMAP data. The northward propagation in these models is tilted southwest-northeast, which is also different from the CMAP result. Thus, there is not a northeast-southwest tilted rain belt revolution off the equator during the BSISO’s eastward journey in the models. The biases of the BSISO are consistent with the summer mean state, especially the vertical shear. Analysis also shows that there is a positive feedback between the intraseasonal precipitation and the summer mean precipitation. The positive feedback processes may amplify the models’ biases in the BSISO simulation.

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Authors and Affiliations

  1. Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Bei**g, 100081, China

    Chongbo Zhao & Hongli Ren

  2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Bei**g, 100029, China

    Tianjun Zhou

  3. National Climate Center, China Meteorological Administration, Bei**g, 100081, China

    Lianchun Song

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  1. Chongbo Zhao
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  4. Hongli Ren
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Correspondence to Chongbo Zhao.

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Zhao, C., Zhou, T., Song, L. et al. The boreal summer intraseasonal oscillation simulated by four Chinese AGCMs participating in the CMIP5 project. Adv. Atmos. Sci. 31, 1167–1180 (2014). https://doi.org/10.1007/s00376-014-3211-7

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