北半球七层原始方程谱模式（三）及其五天中期数值预报试验

北半球七层原始方程谱模式ff考虑了较完整的物理过程:（1）地形作用（采用了σ坐标系）和地面摩擦；（2）动量、热量，水汽的水平扩散过程和垂直扩散过程（其中包括了下垫面感热和水汽作用）；（3）水汽凝结潜热作用；（4）云和辐射作用；（5）积云对流过程等。上述模式采用了非线性平衡方程初值化方法。并利用逐日客观分析资料，制作5天中期数值预报试验。本文给出了1982年冬季和夏季的20个例子的五天数值预报验证结果和一个例子的中期数值预报图和对应的实况图。预报效果比较好。在数值预报试验中，虽然纬向波数只取15个波，但所取得的短期、中期的预报效果能和一些较高分辨率模式的预报效果相比较。

Northern Hemispheric Seven–level Primitive Equation Spectral Model (III) and Its Application to the Medium Range Numerical Weather Prediction

In this seven–level spectral model (III), the following physical processed are included. They are: orographic effects (using σ–ordinate) and surface friction, horizontal and vertical viscosity and diffusion of momentum, moisture and heat, latent heat, heating or cooling due to radiation, and cumulus convection. The initialization scheme of nonlinear balance equation is used in the model. By using the daily objective analysis data from ECMWF, the experimental purpose. The verifications of these cases are discussed in this paper. The results show that the forecasting accuracy of this model is comparable with those obtained with some models with high resolutions