摘要: Altimetric data from satellites are a key component of the observational constraints on which any operational ocean forecasting system can rely to ensure its ocean dynamics consistency. The satellite altimeters offer global and repetitive measurements of the sea level, with a unique resolution and accuracy. Its success and accomplishment in ocean dynamics sciences is yet proven [eg, Fu and Cazenave, 2001].However, since the beginning of satellite altimetry, more than 15 years ago, due to the lack of an accurate geoid, only the variable part of the ocean dynamic topography can be extracted with sufficient accuracy (few centimetres) for oceanographic applications. For the correct interpretation of these altimetric Sea Level Anomalies (SLA) in terms of sea level and geostrophic circulation, the provision of an accurate Mean Dynamic Topography (MDT) is mandatory. This has proved to bring significant improvement …