Abstract
A set of orthonormal (ON) functions were employed to represent the sea surface topography (SST) in a joint model of satellite altimetry where radial orbit errors, the sea surface topography, and the geoid are recovered simultaneously. For comparison, the spherical harmonic representation was also used in another solution. A linear orbit theory was used to model the orbit error. Both solutions used 32 days of Geosat/ ERM data, and the parameters were conditioned using a‐priori information from the GEM‐T2 covariance and hydrographic data. The ON function approach yields ocean currents that have better behavior at the land/ocean boundary as compared results using the spherical harmonic approach. The two Geosat SST models show high correlation with the Levitus SST and the SST derived from I year of TOPEXIPOSEIDON altimetry at low ON degrees. The ON error spectrum of the oceanic geoid was obtained using a transformation technique, thus allowing comparison of the SST and the geoid just over the oceans. The erro...
Published Version
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