三维斜压台风模式Ⅰ.数值方法
A baroclinic typhoon model with a moving multi-nested grid and variational adjustment initialisation Ⅰ. Numerical method
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摘要: 一种多重移动套网格斜压台风模式已被应用于海洋环境数值预报.模式采用σ坐标系的原始方程组作为控制方程.现在用于国家海洋环境预报中心的模式垂直方向为非等距4层,水平方向为Arakawa B型格式,所采用的差分格式满足动量和能量守恒原理.模式控制方程组分离成平流过程和适应过程二组方程,并根据大气运动不同过程的特性,分别采用不同的时间步长和不同的积分方法.预报和后报结果显示该数值方法不仅可以缩短机时,而且可以得到稳定的预报结果.Abstract: A baroclinic typhoon model with a moving multi-nested grid is.applied in marine environmental forecasts.The σ-coordinate primitive eyuations are used as governing eyuations in the model.The model with four uneven layers in the vertical and Arakawa-B grid in the horizontal is used in the National Marine Env,rnnmental Forecasting Centre of China.Finite differencing scheme for the model satisfies the conservation of momentum anti energy.The governing equations of the model are split into two parts which represent advection process and adjustment process,respectively.And different integration schemes with different time steps are employed for the two parts,respectively,according to the features of different processes in atmospheric motion.The forecasting and hindcasting show this numerical method can save computation time while having stable prediction results.
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Key words:
- Typhoon model /
- 3-dimensional baroclinic /
- numerical method /
- moving nested grid
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