海水密度对海面高变化的影响

Seawater Density Effect on Sea Level Height Variation

基于TOPEX/Poseidon卫星测高资料,采用WOA98海水温度及盐度模型,计算了多层海水密度变化引起的海面高变化。结果表明,海水密度变化是引起季节性海面高变化的重要因素。另外,在考虑和不考虑海水密度变化的情况下,估算了海面异常引起上海GPS测站位移和地球重力场位系数J2 的变化。表明,在研究许多地球动力学问题时。

Using TOPEX/ Poseidon satellite altimeter data, and seawater temperature and salinity estimated from WOA98 model, we calculated sea level height variation caused by seawater density change in multi layers. The result shows that seawater density change is an important factor on sea level height variation at seasonal time scale. The displacement at Shanghai GPS station and J 2 variation in Earth's gravity field are quite different, while sea level height variation caused by seawater density change is removed or included from TOPEX/ Poseidon observation. The result shows that it is more important to separate sea level height variation caused by seawater density change in the study of Earth dynamic problem.