有限区域非线性正规波初值化方法实验与比较

Comparative tive Experiment of Nonlinear Normal Mode Initialization for a Limited Area Model

本文以一个有限区域六层斜压原始方程模式为基础，实现了非线性正规波初值化方案，并做了24小时积分预报实验，将非线性正规波初值化方案和平衡初值及实测风初值方案积分结果进行了比较。结果表明：非线性正规波初值化方案对初始场修改较小，初值化后风压场配置合理；积分初期能迅速抑制重力波高频振荡，使模式计算稳定；24小时形势预报较实测风初值预报结果好得多，高层形势预报比平衡初值结果有改进；降水落区远比另外两种方案好。

Based on a limited area baroclinic primitive equations prediction model,nonlinear normal mode initialization scheme(called NNMI for short)is carried out and the model is integrated for 24 hours. NNMI scheme is compared with balanced wind and real wind initialization schemes. The results show that the initial fields derived from NNMI are more reasonable thon other schemes, Spurious gravitational oscillations can be supressed effectively and far better results can be obtained from prediction than that of real wind scheme. precipitation is better than balanced wind scheme. In the case of upper level,it is found that prediction of NNMI is a little better than that of balanced wind scheme.