过去40年天津沿海海平面变化研究

A study on the coastal sea level variation of Tianjin in last 40 years

本文利用塘沽海洋环境监测站实测资料以及法国空间局多卫星融合资料研究了天津沿海海平面的变化。得到如下结论:天津海域近40年平均潮位、最高潮位、最低潮位整体呈上升的趋势,其中最低潮位变化速率最大,为1.35 cm/a,平均潮差、最大潮差整体呈下降的趋势。通过功率谱分析可以看到,天津沿海的潮汐包含了准10年的周期变化。同时结合卫星高度计资料得到的天津沿海的海平面高度也是持续上升。

In this study,the sea level variation along the coast of Tianjin was investigated using the documented tide observations at Tanggu Station and the Sea Level Anomaly(SLA)data from the Archiving Validation and Interpretation of Satellite Oceanographic.The results showed that the average tide level,the highest and the lowest tide level all presented rising trends in last 40 years.The lowest tide level changed most obviously,reaching 1.35cm/a.The average tide range and the highest tide range all presented decreasing trends.The power spectrum analysis showed that the tides along the coast of Tianjin changed periodically each 10 years.At the same time,the analysis by combining with the satellite altimeter data showed that the sea level height along the coast of Tianjin continued to rise.