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在研究中尺度强对流性天气时,首先遇到的问题就是如何从气象场中将中尺度系统分离出来。目前常用的方法是求滑动距平。然而这种分离是不彻底的,且对中尺度波段的波分量有歪曲。本文根据选择滤波原理,设计了几种高通滤波器。连同求滑动距平方法一起,比较了它们的中尺度分离功能。结果表明,我们设计的算子(1.4),其中尺度分离功能最佳。
In the study of mesoscale convective weather, the first problem we encountered was how to separate the mesoscale system from the meteorological field. The common method is to find the slippery anomaly. However, this separation is not complete and distorts the wave components of the mesoscale band. Based on the principle of selective filtering, this paper designs several high-pass filters. Together with the method of seeking anomalous slip, their mesoscale separation functions are compared. The results show that we design the operator (1.4), in which the scale separation function is the best.