A Study Concerning the Pressure Separation Technique Used for Current Nonhydrostatic Mesoscale Models
中尺度非静力模式中常用气压分离技术的研究

The analysis of the truncation error in the vertical pressure gradient has been made with and without the pressure separation technique for different atmospheric stratifications. Computations demonstrate that the error introduced by the technique might be quite large, even equivalent to the case without separation, if the basic field is not properly chosen. Based upon the results a method for choosing the field is suggested. The truncation error in the vertical pressure departure gradient might be one order of magnitude less than that without the pressure separation under certain conditions. Therefore, it is permissible to choose lower vertical resolution in the separation case as compared to the case without separation.