Abstract
A wet tropospheric correction for the Geosat altimeter data is derived from the special sensor microwave imager (SSM/I) water vapor products by sub‐objective mapping. The correction presents wavenumber spectral characteristics close to those of the original SSM/I data in the 200‐ to 2000‐km wave band, and is filtered in the short wavelength domain. In both respects, it behaves significantly better than corrections derived from 4‐day averages of the SSM/I data interpolated quadratically under the Geosat track. As an example, the along‐track rms mesoscale variability is lowered by 3 cm for some tracks in the northeast Atlantic Ocean when this correction is applied rather than the correction of Wentz [1990]. This suggests that it indeed improves the altimeter data.
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