一、引言 在研究海洋中大尺度的低频波动时,常需对日平均海面进行谱分析。国内外的许多研究者在这方面进行了许多工作。 在日平均海面功率谱中,一般都会出现若干峰值,一般认为这些峰值与海面的某一实际低频振动(或波动)相对应。但是,有时候日平均海面功率谱中的谱峰并不对应于其频率为该谱峰频率的振动,而是对应于其频率比谱峰频率高得多(或者说其周期比谱峰周期小得 I. Introduction In studying the large-scale low-frequency fluctuations in the oceans, it is often necessary to conduct a spectral analysis of the daily average sea surface. Many researchers at home and abroad have done a lot of work in this area. In the daily average sea surface power spectrum, there are generally a few peaks that are generally considered to correspond to some actual low-frequency vibration (or fluctuation) on the sea surface. However, sometimes the peak in the daily average sea surface power spectrum does not correspond to the vibration whose frequency is the peak frequency, but corresponds to a frequency that is much higher than the peak frequency (or whose period is shorter than the peak period Got it