摘要
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;2)在分辨率为△=1 d、MJO为30～60 d定义下,Lanczos滤波器参数的阈值nt=69 d,当n≥nt时,可以保证Lanczos滤波器优越性成立.
The performance of Lanczos filter and Butterworth filter was analysed based on filtering Madden-Julian Oscillation signal from long sequences.The results indicate that Lanczos filter is better than Butterworth filter when parameter n is large enough and when n is larger than threshold value 69 day,the advantage of Lanczos is absolutely tenable.
出处
《南京气象学院学报》
CSCD
北大核心
2005年第2期248-253,共6页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金重点资助项目(40233037)
