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中文摘要：
以Lorenz系统为研究对象，对数值天气转折期预报中的动力学特征进行了理论研究，通过对Lorenz系统平衡点稳定性的讨论，得到了区分准稳定区域和准不稳定区域的分界曲面，由此标定出准稳定区域和准不稳定区域。在准稳定区域， Lorenz曲线保持相对稳定，能够在该平衡点周围周期运动；在准不稳定区域， Lorenz曲线可能会从这个平衡点周围跃过分界曲面而进入另外一个平衡点周围，即发生突变，这是Lorenz系统的一个重要动力学特征；对数值天气转折期预报与气候突变检测、预测给出一种新理论和新方法。
英文摘要：
Based on the Lorenz equations, the dynamics of the weather turning period is studied about numerical weather prediction. Through the analysis of the stability of equilibrium points of the Lorenz equations, we get the surfaces which separate the quasi-stable region and quasi-unstable region. In the quasi-stable region, the path curve of the Lorenz equations can remain relatively stable around the equilibrium points, however in the quasi-unstable region, the path curve of the Lorenz equations can spring from this equilibrium point to another one. This is one of the important dynamic characteristics of the Lorenz system, and the paper give new method and theory for the detection of the abrupt change of climate.
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