The performance of Lanczos filter and Butterworth filter was analysed based on filtering Madden-Julian Oscillation signal from long sequences.

• 就长序列资料的MJO滤波,分析了Lanczos滤波器与Butterworth滤波器的滤波性能,结果表明: 1)在滤波器参数n足够大时,Lanczos滤波器对MJO信息的滤出和对非MJO信息的抑制均优于Butterworth滤波器;