引入差比关系法分析西北太平洋TOPEX/POSEIDON卫星高度计测高数据

Tidal harmonic analysis of TOPEX/POSEIDON data in Northwest Pacific by introducing difference-ratio relations

TOPEX/POSEIDON(T/P)卫星高度计数据信息中存在周期成分混淆问题 .对其中的一类混淆引入差比关系方法对混淆的分潮进行分离 .卫星轨道交叉点资料包括升轨和降轨资料 ,资料量比沿轨点资料多 1倍 ,经分析发现 :在已有为期 6a多的观测资料时间序列中 ,在沿轨处混淆的分潮如K1和SSA在交叉点处不再混淆 ,可以直接分离 .因此首先对交叉点资料进行调和分析 .然后由交叉点的分析结果得到分潮间的差比关系 ,处理到相近的沿轨点处 ,从而得到沿轨点的调和常数 .用引入差比关系方法 ,对西北太平洋海区 6a多的T/P卫星高度计资料进行了潮汐分析 ,并与沿岸及岛屿验潮站资料进行了比较 ,所得结果较满意 .

The difference ratio relations are introduced to separate tidal constituents that are aliased due to the sample interval of the TOPEX/POSEIDON altimeter. It is found that some tidal constituents such as K 1 and SSA, though aliased at along track points, are not aliased at crossover points because there is one time more data at crossover points than that at along track points. So the harmonic analysis method can be employed directly on time series at the crossover points. Then the difference ratio relations from the crossover points are introduced to analyze the time series at along track points. The TOPEX/POSEIDON data in the Northwest Pacific are analyzed with this method. The results from this method agree well with tidal constants from tidal gauges.