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Houry et al. 1994
Houry, S., Minster, J.F., Brossier, C., Dominh, K., Gennero, M.C., Cazenave, A. and Vincent, P. (1994). Radial orbit error reduction and mean sea surface computation from the Geosat altimeter data. Journal of Geophysical Research 99: doi: 10.1029/93JB02004. issn: 0148-0227.

Using the altimeter data from the Geosat Exact Repeat Mission, we have produced yearly averaged mean profiles and a global mean sea surface. The radial error of each 6-day orbital arc computed with the GEM-T2 geopotential was first estimated by calculating the amplitude and phase of the nine dominant frequencies of the difference between the altimetric profiles and the mean sea surface obtained when adding the permanent sea surface topography (computed from the Levitus' Climatological Atlas) to the GE-T2 geoid. We show that this operation is little affected by the choice of the geoid or by its formal error. The resulting correction has been subtracted from each individual arc. Yearly mean profiles were then obtained by averaging the corrected altimetric data of each repeat cycle on a yearly basis. Their noise level is 1 to 2 cm and their resolution is 20 km, but the differences of the altimetric heights at crossovers of ascending and descending tracks are still 30 cm rms. The latter can be reduced to 7 cm rms by a crossover analysis. In addition to the mean values, standard deviations were computed at each point of the repeat cycle. This ''yearly along-track variability'' is of the order of 10 cm rms and is dominated by the ocean mesoscale variability. A global yearly mean sea surface has been derived by bilinear interpolation. Its resolution ranges approximately from 160 km to 80 km, depending on the latitude. It is shown to be much less noisy than those deduced from GEOS 3 and Seasat data.

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Abstract

Keywords
Geodesy and Gravity, Regional and global gravity anomalies and Earth structure, Geodesy and Gravity, General or miscellaneous, Oceanography, Physical, General or miscellaneous
Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
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