A Method for Separation of the Ultra-Long Waves in the Atmosphere into the Quasi-Stationary and Transient Parts by the Time-Filters
A Method for Separation of the Ultra-Long Waves in the Atmosphere into the Quasi-Stationary and Transient Parts by the Time-Filters
复制标题
时间滤波器将大气中超长波分离为准静止部分和瞬态部分的方法
DOI：
10.2151/jmsj1965.49.3_158
复制
发表时间：
1971
期刊：
影响因子：
--
通讯作者：
R. Yamamoto
中科院分区：
文献类型：
--
作者：
T. Iwashima;R. Yamamoto
A method for analysis of the ultra-longwaves in the atmosphere, which are represented by Fourier harmonics of the geopotential field etc., is presented. Firstly, the ultra-long wavesare separated into the quasi-steady and the fluctuating parts by applying several band-pass and one low-pass time filters to the time series of Fourier harmonics. Secondly, the fluctuating parts, which pass through the band-pass filters, are devided into the transient part and the quasi-stationary part with temporal change of the amplitude, with the procedure of shifting the cosineand sine-time series by a quarter of the period. This method is applied to the geopotential field,and some preliminary results are given as an example.
