用交叉点数据计算中国近海海平面变化

讨论了由测高卫星升、降弧段海面高在交叉点上的约束监测海平面变化的方法；用TOPEX／POSIDON测高数据计算了中国黄海、东海、南海海域的海平面变化，其中黄海、东海海域受两个月周期分量的振荡信号影响，而南海海域以年周期变化为主要表现特征；分析了3个海区海平面变化的相关性，扣除两个月的周期分量振荡信号后，其海平面变化的相关性达到90％以上；分析了海水面积随纬度带的变化对不同纬度分布的海区海平面变化量的影响。

SEA LEVEL VARIATION OVER CHINA SEAS FROM TOPEX/POSIDON CROSSOVERS DATA

The method of determining sea level variation over China seas is discussed by using TOPEX/POSIDON crossovers data. The sea level variations in the regions of China seas including the Yellow Sea,the East China Sea and the South China Sea are computed. The results show that oscillatory signals for two-month period are prominent in the Yellow Sea and the East China Sea, the annual period signals are basic characteristics in the South China Sea. The correlations among the sea level variations of the three China seas are analyzed. If the oscillatory signals for two-month period are deducted from the sea level variations, the correlations reach over 90%.It is found and analyzed that the sea water areas in the three regions with different latitude are different also,and thus it influences the sea level variations.