Initialization of Limited Area Model Based on the Principle of Nonlinear Normal Mode Initialization
非线性正规模初值化原则在有限区模式的实现

Two general conditions of initialization for limited area model and their corresponding iterative computational formulae are derived in this paper. These conditions are equivalent to those of nonlinear normal mode initialization, but totally expressed in terms of the model variables. The fact that the normal modes of the model do not appear in those formulae makes it easy to perform in any regional model, of which the normal modes are usually difficult to derive. This proposed initialization scheme is applied to the two numerical prediction models. The results have proven that this scheme can effectively suppress the unwanted high frequency gravitational oscillation due to imbalance existing in the initial data .