Abstract
Extensive analyses of long-term averaged altimetrically determined sea height differences at crossovers for the satellites Geosat, ERS-1 and Topex/Poseidon (single satellite crossovers) as well as between the pairs of satellite (dual-satellite crossovers) clearly show the effects of orbit errors arising from the geopotential model (JGM3) used in computing their pairs. Upon inversion for an adjusted geopotential, the residuals for the dual satellite crossovers with multi-year gaps reveal surprisingly strong and consistent signals which appear to be largely of interannual oceanographic origin. We show that the height differences are sensitive to a variety of other orbit, instrument, tide and even geodetic errors, generally at lower level of observability. The results of the inversion to harmonic geopotential coefficients to degree and order 50 as extension of JGM3 will be discussed.
Published Version
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