Features of the Baiu Front Simulated in an AGCM (T42L52).

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Abstract

The simulation studies of the Meiyu-Baiu front, by global climate models, have not been performed in depth. A few experimental studies show insufficient precipitation in the Meiyu-Baiu front, without the detailed analysis on circulation systems in and around the Meiyu-Baiu front. In the present report, we study features of the Meiyu-Baiu front and associated circulation systems simulated in the climatological SST run by the T42L52 model (the maximum zonal wave-number is 42 in triangular wave transformation, and the number of the vertical level is 52) in comparison with the features described in observational studies. The Baiu front is not properly reproduced in the monthly averaged field for June and July. This is due to the alternation of relatively short “Baiu phase” and the longer “non Baiu phase”.<br> In the “Baiu phase”, the large-scale circulation systems, such as the cut-off cyclones and blocking ridge in the northern latitudes, westward extending Pacific Subtropical anticyclone, monsoon westerly, and subtropical jet stream, are properly maintained. Only under this large-scale condition, a realistic Baiu frontal zone is formed in the model. The structure of the Baiu front, the features of precipitation, and the thermal stratification around the frontal zone are reasonably reproduced. In contrast, in the “non Baiu phase”, features in the large-scale field are significantly different from the observed features in the break period, while the continent-ocean thermal contrast is reasonably maintained. Judging from the results, the formation of the Baiu front does not only depend on the direct local effects of physical processes, and continent-ocean thermal contrast, but depends on the maintenance of large-scale environmental circulation systems favorable to sustain the Meiyu-Baiu front.<br>

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