The forecast skill for different forecast methods is examined by the climatic persistence forecast.
用气候持续预报来检测不同预报方法的预报技巧。
The forecasts of 10-day and 30-day average by using three methods mentioned above, especially the last two, have an improvement over a persistence forecast.
预报结果表明，三种方法的旬和月平均预报均超过惯性预报的水平，其中以后两种方法为佳。
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