台湾岛周边海域近16a来海平面变化研究

Study of the variation in sea level around Taiwan Island during the last 16 years

利用1992年10月至2008年6月的卫星高度计融合资料对台湾岛周边海域(20°～28°N,117°～124°E)多年海平面变化进行分析.研究结果表明:(1)采用改进的月平均水位周期信号的谱分析方法计算多年来台湾岛周边海域海平面年均上升速率为0.34±0.02 cm/a,与该海域内的潮位站结果较为一致.(2)台湾岛周边海域海平面高度变化以1 a周期变化为主,其次为0.5 a、准2 a周期变化.(3)通过计算海平面异常的标准差得出多年来台湾海峡西南部海域海平面波动最为激烈.(4)分析了台湾岛周边海域海平面4个季节的变化情况,指出台湾岛周边海域海平面季节变化的主要驱动力是风场.

Satellite altimeter merged data from Oct.1992 to Jun.2008 were used to analyze the multi-year variation in sea level around Taiwan Island（20°～28°N,117°～124°E）.The results showed：（1） improved spectral analysis of the monthly average water level periodic signal produced an increased rate of 0.34±0.02 cm/a,which is consistent with the results from the tide gauge data.（2） The annual cycle is the dominant component of sea surface height variation around Taiwan Island,although the half-year cycle undulation and quasi-2-year cycle undulation also play a role.（3） Calculation of the standard deviation of the sea level anomaly revealed that sea surface undulation in the southwest of the Taiwan Strait is the strongest.（4） Analysis of the variation in sea level around Taiwan Island during the four seasons indicates the wind field is the main driving force behind the variation.