CoAuthors

Sean Bruinsma (CNES, France); Franck Reinquin (CNES, France)

A new model of marine free-air gravity anomalies has been determined. It is based on the same data set used in the CNES CLS 2022 Mean Sea Surface determination. Particular attention was paid to the shortest wavelengths of less than 30 km. Furthermore, data sampling at 1 Hz (~7km) along track is not sufficient in this context. It is necessary to focus this new determination on the use of high-resolution data that are provided by a new generation of altimeters such as the Cryosat-2 (20 Hz) and SARAL (40 Hz) missions in the geodetic/drifting phase. However, at this rate, observations are too noisy and need application of a dedicated optimal filter.
We will present a validation of this new model based on a comparison with existing models, which were also derived from altimetry data.