The regional spectral model component is a primitive equation model on a stereographic projection and uses sine - cosine series as horizontal basis functions . the regional component predicts deviations from the forecasting of the global morjel component 区域部分的预报偏差来自全球模式部分的预报，在区域范围内，半隐式时间格式、时间滤波、初始化和水平扩散的应用都与偏差有关。
