高度计资料提取内潮信号的方法

摘要

为探索高度计资料提取内潮海表面信号更简便有效的方法，利用1992－2002年共10 a 的 TOPEX/Poseidon(T/P)卫星高度计数据进行处理分析.首先，将10 a 高度计资料的调和分析结果与历史数据进行比较，验证调和分析方法的可靠性.在此基础上，采用2种不同的多项式拟合方法提取夏威夷海区 M 2内潮的海表面信号：一种是对振幅 A 、迟角G 分别进行沿轨多项式拟合，另一种是对 A cos G 、A sin G 分别进行沿轨多项式拟合.2种方法的结果对比表明，后者的拟合结果优于前者，且11次多项式拟合的结果最优.%10-year ocean topography experiment(TOPEX/Poseidon)(T/P)along-track altimetry was used to conduct a method research on the extraction of internal tide.Firstly,the harmonic analysis result about altimeter data was compared with historieal data to check whether the harmonic analysis method used in this paper is reliable.Then the method of polynomial fitting was used to extract the M2 internal tide sea surface signals.In this procedure,two strategies were used to fit the along-track harmonic constants:one to fit the values A (amplitude)and G (phase-lag)separately,and the other to fit the values AcosG and AsinG separately.The comparison of the results obtained from these two different strategies shows that the latter is better than the former,because it can better separate the barotropic and baroclinic compo-nents.With the latter strategy the comparison among the results of 3 ~15th order polynomial fitting was given.The results show that the 1 1th order polynomial fitting is the best,which can completely separate the barotropic and baroclinic components.