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An apparent wave height dependence in the sea-state bias in Geosat altimeter range measurements

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  • The sea-state bias in Geosat altimeter range measurements expressed as a percentage of significant wave height (SWH) is examined as a function of SWH. The bias is shown to be approximately a fixed -3.5% of SWH for SWH smaller than about 4 m. For larger SWH, the bias decreases in magnitude approximately linearly to a value of about -1.5% of SWH for 6 m SWH. Because of this "saturation effect" associated with large SWH, estimates of the Geosat sea-state bias which have been based on the assumption of a fixed percentage of SWH are too small by up to 1.5% of SWH. The saturation effect is so large at high latitudes in the southern hemisphere (where about 1/4 of the SWH values exceed 4 m) that it apparently overwhelms any wind speed dependence in the sea-state bias suggested by several recent studies. The apparent SWH dependence found in this study appears to be the result of attitude and sea-state errors in the Geosat altimeter on-board tracking algorithm.
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  • Witter, D., and D. Chelton (1991), An Apparent Wave Height Dependence in the Sea‐State Bias in Geosat Altimeter Range Measurements, J. Geophys. Res., 96(C5), 8861-8867.
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  • 96
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  • C5
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