球谐函数展开在寒潮中期预报上的应用
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章基嘉  
彭永清  
王鼎良  
中文摘要:寒潮天气过程的中期预报首先要着眼于大尺度环流系统的演变。本文对一九七六年十二月一次属于绕极涡旋断裂、横糟转向类型的寒潮过程,应用富氏谐波、球面谐波函数展开的方法,研究了北半球100毫巴上超长波各分波振幅的时变特征,和超长波的调整过程。并就100毫巴超长波活动与500毫巴的环流调整相此较,得到了一些有意义的结果。可供实际寒潮中期预报业务参考。
 
The Application of Fourier and Spherical Harmonics to Medium-range Forecasting of Cold Waves
Abstract:Through the application of Fourier and spherical harmonics, analyses are made of the characteristic features of the change with time in amplitudes of the 100mb component ultra-long waves, as well as of their adjustment, in the cold wave occurring in December 1976 in the northern hemisphere, which was characterized by the polar vortex cut-off process with a transverse trough moving around. By making comparison between the activities of the 100mb ultra-long waves and the adjustment of the 500-rob circulation, the authors have achieved some results, which may be helpful to routine medium-range forecasting of cold waves.
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