Abstract
Most of today’s sea level studies are using the recent and high quality data of JASON-1 and TOPEX/Poseidon. Previous missions, like, e.g., ERS-1 or GEOSAT, show significant higher noise and errors. One of the main error sources is the orbit determination. In this study new GEOSAT orbits have been derived using new models and orbit determination strategies. With the new orbits the accuracy in terms of cross-over RMS is reduced from 15 to 9 cm RMS, which is almost the level of ERS-2. In addition, the orbit accuracy becomes more uniform for both the Geodetic Mission and Exact Repeat Mission period. The effects of recomputed satellite orbits on sea-level anomalies are shown.
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Acknowledgments
ILRS (Pearlman et al., 2002) and IDS (Tavernier et al., 2006) data were used. GEOSAT Doppler data were provided by C.K. Shum (Ohio). RA data are provided by ESA for ERS-1 and ERS-2, by NASA/CNES for TOPEX/Poseidon and JASON-1, and by NOAA for GEOSAT. This is publication no. GEOTECH-1252 of the GEOTECHNOLOGIEN programme of BMBF, grant 03F0434A. Altimetry and orbit data is available through the ADS system at GFZ http://adsc.gfz-potsdam.de/ads.
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Schöne, T., Esselborn, S., Rudenko, S., Raimondo, JC. (2010). Radar Altimetry Derived Sea Level Anomalies – The Benefit of New Orbits and Harmonization. In: Flechtner, F., et al. System Earth via Geodetic-Geophysical Space Techniques. Advanced Technologies in Earth Sciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-10228-8_25
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DOI: https://doi.org/10.1007/978-3-642-10228-8_25
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