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SPACE OCEANOGRAPHY
MEAN SEA SURFACE |
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Overview CLS_01 MSS CLS_SHOM98.2 MSS Data products Bibliography Links |
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The mean sea surface CLS_SHOM98.2 has been computed on the
reference provided by the 3-year TOPEX/POSEIDON mean
profile. T/P, ERS-1 and Geosat data have been merged using the inverse local technique to compute the mean sea heights on a 1/16 x 1/16 degrees grid, and also the associated mapping errors. The surface is calculated between 82°N and 82°S when data are available (not over land, not over ice-covered areas), and near the coast, above 10 meter depth, a specific interpolation is applied.
The global Free Gravity Anomly, and Vertical Deflections surfaces, were also estimated with the same altimetric dataset, using a derived inverse technique. Thus, the MSS and these surfaces provide a consistent description of the Earth gravity field. The CLS01 MSS, a direct heritage of the CLS_SHOM98.2 project. 7 years of T/P, 5 years of ERS-1/2, ERS-1 geodetic data, and 2 years of GEOSAT data were processed and homogenized using the most recent corrections to compute the CLS01 MSS on a 1/30 x 1/30 degrees grid. The mean ocean topography corresponds to the 1993-1999 period. The surface is global (80°S to 82°N), oceanwide where altimetric data are available, EGM96 elsewhere and on continents (with a smooth continuity in between). The improved inverse technique provides better estimates near the coastal areas. This MSS is dedicated for referencing Jason-1 and EnviSat data. |
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NOTA: the MSS contain the mean geoid plus the mean ocean topography. The mean geoid is the geoid that would exist in the presence of the Sun and the Moon (or, equivalently, if no permanent tidal effects are removed). These mean sea surfaces are referenced to the T/P Earth ellipsoid, in the frame of the T/P NASA Precise orbit determination.
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Overview CLS_01 MSS CLS_SHOM98.2 MSS Data products Bibliography Links |
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| Copyright © 1999 CLS. All rights reserved. |